65 results on '"Qishe Yan"'
Search Results
2. Interfacial coupling of 3D nanoflower-like Bi2O2CO3 with PANI for tetracycline photocatalytic degradation and intermediate toxicity analysis
- Author
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Huiru Zuo, Chenyu Wu, Haoyu Du, Zhiyuan Guo, Yanan Cheng, and Qishe Yan
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General Physics and Astronomy ,Surfaces and Interfaces ,General Chemistry ,Condensed Matter Physics ,Surfaces, Coatings and Films - Published
- 2023
3. Enhanced photocatalytic activity of AgBr photocatalyst via constructing heterogeneous junctions with reduced graphene
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Qishe Yan, Menghan Zhang, Ximeng Sun, Qi Yin, Liyu Fang, Siyu Zhang, Yanning Shao, and Tongtong Zhang
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010302 applied physics ,Materials science ,Photoluminescence ,Graphene ,Doping ,Heterojunction ,Silver bromide ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,X-ray photoelectron spectroscopy ,Chemical engineering ,chemistry ,law ,0103 physical sciences ,Rhodamine B ,Photocatalysis ,Electrical and Electronic Engineering - Abstract
A series of reduced graphene (rGO) and AgBr composite heterojunction photocatalysts were fabricated through a facile solvothermal method. The rGO/AgBr heterostructures were characterized by XPS, XRD, UV–Vis DRS, SEM, TEM, photoluminescence (PL), and the transient photocurrent responses. The XRD, SEM, XPS, and TEM analyses indicated that the graphene and silver bromide were successfully compounded without other impurities. The UV–Vis DRS exhibited that the rGO/AgBr composites have better optical properties than pure silver bromide. The PL and the transient photocurrent responses demonstrated that the addition of graphene significantly promotes the separation of photogenerated electrons and holes. Subsequently, the photocatalytic activities of rGO/AgBr composites were studied by degrading Rhodamine B (RhB). It turned out that the degradation rate of RhB by the rGO/AgBr heterojunction photocatalysts was significantly higher than that by pure AgBr. Furthermore, to study the photocatalytic degradation mechanism of RhB by rGO/AgBr heterostructures, the trapping experiments were used to identify main active components. This work confirmed that the photocatalytic degradation performance of the catalyst was greatly improved after doping graphene, which provided certain data support for degradation of organic contaminants in water.
- Published
- 2021
4. Novel La
- Author
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Tongtong, Zhang, Siyu, Zhang, Chenyu, Wu, Huiru, Zuo, and Qishe, Yan
- Abstract
Controlling semiconductor photocatalysts by doping rare-earth ions is an effective strategy to improve photocatalytic performance. Simple solvothermal and calcination methods were used to prepare La
- Published
- 2022
5. Facile construction of 0D/2D In2O3/Bi2WO6 Z-scheme heterojunction with enhanced photocatalytic activity for antibiotics removal
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Qishe Yan, Zhiyuan Guo, Peiying Wang, Yanan Cheng, Chenyu Wu, and Huiru Zuo
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Mechanics of Materials ,Mechanical Engineering ,Materials Chemistry ,Metals and Alloys - Published
- 2023
6. Novel La3+/Sm3+ co-doped Bi5O7I with efficient visible-light photocatalytic activity for advanced treatment of wastewater: Internal mechanism, TC degradation pathway, and toxicity analysis
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Tongtong Zhang, Siyu Zhang, Chenyu Wu, Huiru Zuo, and Qishe Yan
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Environmental Engineering ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,Environmental Chemistry ,General Medicine ,General Chemistry ,Pollution - Published
- 2023
7. Br-doping mediated band-gap engineering contributed Bi/Bi2O2CO3 nano-platelets with enhanced photocatalytic performance
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Chenyu Wu, Huiru Zuo, Shengjie Zhao, Yanan Cheng, Zhiyuan Guo, and Qishe Yan
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General Chemical Engineering ,Environmental Chemistry ,General Chemistry ,Industrial and Manufacturing Engineering - Published
- 2023
8. Facile construction for new core-shell Z-scheme photocatalyst GO/AgI/Bi2O3 with enhanced visible-light photocatalytic activity
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Jie Ding, Yongjiang Zhang, Xin Xie, Siyu Lu, Shenbo Wang, Qiang Cai, Yushan Liu, Yonggang Liu, Baojun Li, and Qishe Yan
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Materials science ,Heterojunction ,02 engineering and technology ,Visible light photocatalytic ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Silane ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Biomaterials ,Chemical kinetics ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,chemistry ,Chemical engineering ,Photocatalysis ,Methyl orange ,Irradiation ,0210 nano-technology ,Visible spectrum - Abstract
Heterojunction formation and morphology control have always been regarded as effective ways to improve the performance of visible-light-driven photocatalysts. In this study, a new facile strategy was applied to synthesize the Z-scheme GO/AgI/Bi2O3 heterojunction, where polyvinyl pyrrolidone (PVP) and γ-methacryloxypropyl trimethoxy silane (KH-570) were used to modulate the morphologies. Methyl orange and tetracycline hydrochloride were chosen as target contaminants to evaluate the photocatalytic properties of samples and the results revealed that 2% GO/AgI/Bi2O3 exhibited the best photocatalytic performance under visible-light irradiation. The enhanced photocatalytic activity can mainly attribute to Z-scheme heterojunction formed by the deposing of AgI and GO as well as the sufficient heterogeneous interfaces resulted from the improved morphology, which have effectively promoted the separation and transfer of electron-hole pairs. To deeply realize the enhanced performance of GO/AgI/Bi2O3 photocatalysts, the reaction kinetics, trapping experiments and photocatalytic mechanism were deduced.
- Published
- 2021
9. Er
- Author
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Yiwen, Fu, Yang, Zhang, Lina, Wei, Haoyu, Du, and Qishe, Yan
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Sterilization ,Water ,Metals, Rare Earth ,Wastewater ,Oxidation-Reduction ,Catalysis - Abstract
Defect construction and rare earth doping are the linchpins to completing the target of partial electronic regulation. In Er
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- 2022
10. Construction of Z-scheme Ag-AgBr/Bi
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Huiru, Zuo, Chenyu, Wu, Haoyu, Du, Hao, Shi, Yiwen, Fu, Tongtong, Zhang, and Qishe, Yan
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Bromides ,Silver ,Nanotubes, Carbon ,Silver Compounds ,Electronics ,Tetracycline ,Bismuth ,Anti-Bacterial Agents - Abstract
It is a useful strategy to use a solid electronic mediator with good conductivity to assist the separation of semiconductor photo-induced electron-hole pairs and the redox of semiconductor materials. In order to construct a photocatalyst for more efficient photocatalytic degradation of antibiotics, a simple hydrothermal and precipitation method was used to construct the Ag-AgBr/Bi
- Published
- 2022
11. Construction of Ag SPR-promoted Z‐scheme Ag2MoO4/CuBi2O4 composites with enhanced photocatalytic performance
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Menghan Zhang, Qishe Yan, Yushan Si, Yongyang Chen, Xin Xie, Ke Yan, and Chengyang Xu
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Materials science ,Precipitation (chemistry) ,Condensed Matter Physics ,Redox ,Atomic and Molecular Physics, and Optics ,Silver nanoparticle ,Electronic, Optical and Magnetic Materials ,Catalysis ,chemistry.chemical_compound ,X-ray photoelectron spectroscopy ,chemistry ,Chemical engineering ,Photocatalysis ,Rhodamine B ,Electrical and Electronic Engineering ,Photodegradation - Abstract
Recently, the photocatalytic oxidation technique for removing antibiotics and industrial dyes in wastewaters has attracted widespread concern. Herein, a Z-scheme Ag2MoO4/CuBi2O4 heterojunction was synthesized by utilizing a facile in situ precipitation medium and characterized by XRD, FT-IR, XPS, FE-SEM, EDS, TEM, UV–Vis DRS, PL and photoelectrochemical test for explaining the compositions, morphologies and optical natures of synthesized catalysts. Most importantly, the size of the Ag2MoO4 is significantly reduced after loading, due to the pre-adsorption of Ag ions on the CuBi2O4 rod and limiting its growth. The best photocatalytic degradation property was achieved when introducing ~ 50% moral of Ag2MoO4 in the Ag2MoO4/CuBi2O4 (AC-50), and the degradation efficiency of tetracycline (TC) and rhodamine B (RhB) was 1.84 times and 2.04 times than that of pristine CuBi2O4. Besides, the reduction of silver nanoparticles (NPs) on the surface of Ag2MoO4/CuBi2O4 during photodegradation contributes to the formation of the Z-scheme Ag2MoO4/Ag/CuBi2O4 charge transfer system. Tapping tests and ESR analysis had proved that superoxide radicals (·O2−) and holes (h+) were the governing active substances during the process of photodegradation. In view of characterization results and capture tests, a plasma Z-scheme Ag2MoO4/Ag/CuBi2O4 heterojunction mechanism is further described, which provides more redox species and contributes to water pollution repair treatments.
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- 2020
12. Emission characteristic and environmental impact of process-based VOCs from prebaked anode manufacturing industry in Zhengzhou, China
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Yi-Shun Zhang, Yi-Dan Li, Chen Li, Yonggang Liu, Qishe Yan, Shi-Jie Han, Ruiqin Zhang, Shasha Yin, and Qing-Yan Zhao
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Atmospheric Science ,Ozone ,010504 meteorology & atmospheric sciences ,Xylene ,010501 environmental sciences ,01 natural sciences ,Pollution ,Ethylbenzene ,Toluene ,Styrene ,Aerosol ,chemistry.chemical_compound ,chemistry ,Environmental chemistry ,Environmental science ,Benzene ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Naphthalene - Abstract
Process-based samples of VOCs were collected in three prebaked anode manufacturers to analyze the emission characteristics of calcining and baking process. Besides, the ratios of diagnostic VOCs were investigated, and the OH loss rate (LOH), ozone potential formations (OFP) and secondary organic aerosol formations potential (SOAFP) of VOCs were calculated to estimate environmental impact. Results shows that the VOCs concentrations emitted from calcining and baking were in the range of 213.5–1081.8 μg/m3, and 2530.1–26774.8 μg/m3, respectively. Aromatics accounted 51.8% and 68.7% and naphthalene accounted 22.6% and 30.7% for total VOCs in calcining or baking, respectively. VOCs emission factors of prebaked anode manufacturing industry were averaged 0.198 ± 0.153 kg/t, and at least 3.2 ± 2.5 kt and 5.6 ± 4.4 kt VOCs were released in China and global, respectively, in 2017. The measured diagnostic ratios of VOCs such as benzene, toluene, xylene, ethylbenzene, naphthalene, styrene, and CS2 were expected to be useful for source identification. VOCs emitted from baking had more adverse impact on environment than calcining, and whether in calcining or baking, aromatics were the largest contributor to LOH, OFP and SOAFP, means that should be controlled primarily.
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- 2020
13. Perovskite Agbio3 Synergistic Oxygen Vacancies Stimulate Bi5o7i Photocatalytic Performance Research in the Full Spectrum
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Yang Zhang, Yiwen Fu, Lina Wei, Haoyu Du, and Qishe Yan
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- 2022
14. Synthesis and characterization of Z-scheme Ag2WO4/Bi2MoO6 heterojunction photocatalyst: enhanced visible-light photodegradation of organic pollutant
- Author
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Yushan Si, Fenfang Zuo, Miao Xu, Qishe Yan, Xinyu Zhang, and Yongyang Chen
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010302 applied physics ,Materials science ,Heterojunction ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Catalysis ,chemistry.chemical_compound ,Adsorption ,chemistry ,Chemical engineering ,law ,0103 physical sciences ,Photocatalysis ,Electrical and Electronic Engineering ,Crystallization ,Photodegradation ,Methylene blue ,Visible spectrum - Abstract
A series of Z-scheme Ag2WO4/Bi2MoO6 composites were successfully synthesized by a solvothermal-precipitation method. The crystallization, optical property, morphology properties were studied by XRD, UV–Vis DRS, PL, PT, EIS, BET, and SEM, respectively. The photocatalytic properties of Z-scheme Ag2WO4/Bi2MoO6 photocatalyst were evaluated by the degradation of methylene blue (MB) under visible-light irradiation. The results have shown that 30%Ag2WO4/Bi2MoO6 samples possessed the highest photocatalytic activity and superior adsorption capability for methylene blue (MB) with almost complete degradation within 30 min, which was considerably better than pure Bi2MoO6 (70%) and Ag2WO4 (32%). The enhanced photocatalytic activity can be attributed to the synergistic effect in the Ag2WO4/Bi2MoO6 composites, lower electron–hole recombination rate, and higher electron–hole separation efficiency. Radical trapping experiments revealed that the •O2− and h+ were the main active species in catalysis. In addition, the potential photocatalytic mechanism also was discussed based on experimental and characterization results. This work provides a simple method for synthesizing photocatalysts with excellent photocatalytic performance, which has a good prospect in the field of water purification.
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- 2019
15. Er3+/Sm3+ co-doped Bi2O2CO3 in photocatalytic water treatment: Immobilization, acute toxicity, sterilization, and catalytic oxidation activity
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Yiwen Fu, Yang Zhang, Lina Wei, Haoyu Du, and Qishe Yan
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Environmental Engineering ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,Environmental Chemistry ,General Medicine ,General Chemistry ,Pollution - Published
- 2022
16. A novel strategy to construct a direct Z-Scheme Bi@Bi2O2CO3/g-C3N4 heterojunction catalyst via PDA electronic bridge
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Chenyu Wu, Huiru Zuo, Siyu Zhang, Shengjie Zhao, Haoyu Du, and Qishe Yan
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History ,Polymers and Plastics ,Filtration and Separation ,Business and International Management ,Industrial and Manufacturing Engineering ,Analytical Chemistry - Published
- 2022
17. Constructing a novel hierarchical ZnMoO4/BiOI heterojunction for efficient photocatalytic degradation of tetracycline
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Menghan Zhang, Qishe Yan, Yushan Si, Yuan Guo, Peiying Wang, and Yongyang Chen
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010302 applied physics ,Materials science ,Band gap ,Radical ,Composite number ,Heterojunction ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Chemical engineering ,Phase (matter) ,0103 physical sciences ,Photocatalysis ,Electrical and Electronic Engineering ,Photodegradation ,Visible spectrum - Abstract
The series of novel visible-light-driven ZnMoO4/BiOI heterojunctions were successfully fabricated via in situ solvothermal directly growth of BiOI on the surface of ZnMoO4 plate-like, and the ratio of composite was optimized by increasing of ZnMoO4 loading. The phase, morphology and optical characteristics of obtained ZnMoO4/BiOI heterojunctions were systematically characterized using several analytical measures. The photocatalytic performance was assessed by degrading tetracycline (TC) under visible light irradiation. The results showed that the 30 wt% ZnMoO4/BiOI (ZB-30) composite exhibited highest photocatalytic performance than others. The enhanced photocatalytic efficiency could be attributed to the appropriate band gap of composites, strong visible light response, the formation of heterojunctions with close interface contact and generation and separation of photoinduced carriers. The trapping experiments indicated that ·O2−, h+ and ·OH radicals played distinct parts in the photodegradation process, and ·O2− radicals was the dominant specie. In addition, a probable photocatalytic mechanism of the fabricated composites was also put forward.
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- 2019
18. Constructing a new Z-scheme multi-heterojunction photocataslyts Ag-AgI/BiOI-Bi2O3 with enhanced photocatalytic activity
- Author
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Xin Xie, Yongyang Chen, Yonggang Liu, Qishe Yan, Menghan Zhang, Yushan Si, and Shenbo Wang
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021110 strategic, defence & security studies ,Environmental Engineering ,Materials science ,Health, Toxicology and Mutagenesis ,Radical ,Kinetics ,0211 other engineering and technologies ,Nanoparticle ,Heterojunction ,02 engineering and technology ,010501 environmental sciences ,Photochemistry ,01 natural sciences ,Pollution ,law.invention ,chemistry.chemical_compound ,chemistry ,X-ray photoelectron spectroscopy ,law ,Methyl orange ,Photocatalysis ,Environmental Chemistry ,Electron paramagnetic resonance ,Waste Management and Disposal ,0105 earth and related environmental sciences - Abstract
The series Ag-AgI/BiOI-Bi2O3 visible-light-driven photocataslyts were successfully synthesized by solvothermal method. The as-synthesized samples were systematically characterized by XRD, SEM, TEM, EDS, BET, XPS, FR-IR, UV–vis DRS, photoelectrochemical measurements and EPR. The formation mechanism of the new composite photocataslyts was investigated and the simulate formation process had been illustrated. The photocatalytic properties of the samples were evaluated by degradation of methyl orange under visible-light irradiation. The results shown that the 30% Ag-AgI/BiOI-Bi2O3 photocataslyts possessed the best photocatalytic activity and the kinetics reaction models were followed pseudo-first-order kinetics. The enhanced photocatalytic performance could be attributed to the effective separation and transfer of electron–hole pairs resulting by the deposing of Ag-AgI nanoparticles and Bi2O3. The photocatalytic mechanism was deduced by trapping experiments and EPR, and the results demonstrated that h+, OH, O2− radicals played different roles in the degradation. Furthermore, a new Z-scheme multi-heterojunction mechanism was proposed basing on the results of trapping experiments and EPR.
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- 2019
19. Characterization of individual particles and meteorological conditions during the cold season in Zhengzhou using a single particle aerosol mass spectrometer
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Shasha Yin, Fangcheng Su, Minghao Yuan, Qishe Yan, Shenbo Wang, Bing He, Nan Jiang, Xiaoyan Tang, and Ruiqin Zhang
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Atmospheric Science ,Haze ,010504 meteorology & atmospheric sciences ,Levoglucosan ,Coal combustion products ,Humidity ,010501 environmental sciences ,Wind direction ,Atmospheric sciences ,01 natural sciences ,Wind speed ,Aerosol ,chemistry.chemical_compound ,chemistry ,Environmental science ,Particle ,0105 earth and related environmental sciences - Abstract
To investigate the formation of haze during the cold season, continuous ambient air measurements were taken at an urban site in Zhengzhou from October 10, 2016 through December 31, 2016 using a single particle aerosol mass spectrometer. In total, 4,099,800 particles were analyzed and classified into eight major particle types: elemental carbon (EC, 36.7%), organic carbon (OC, 30.0%), ECOC (8.6%), K-rich (13.0%), levoglucosan (1.2%), metal (2.2%), NH4-K (2.1%), and dust (6.2%). By combining these measurements with correlation analysis and wind data, particle sources were determined to be vehicles, industrial emissions, coal combustion, biomass burning, secondary aerosols, agriculture, and dust. Additionally, analysis of mixing states indicated that particles underwent substantial aging and secondary OC particles were dominant OC species. Temporal profiles of meteorological parameters, mixing states, and particle types during a typical haze episode revealed that EC and OC particles were dominant components during haze formation, and a northeastern transport route (Anyang-Zhengzhou and Puyang-Xuchang) for OC particles was identified by potential source contribution function and concentration weighted trajectory analysis. Relatively higher humidity and lower temperature favored the formation of secondary inorganic aerosol. Wind direction and speed determined the transport, formation, and elimination of stagnant weather conditions. In sum, heavy haze during the cold season in Zhengzhou was observed due to extensive aerosol aging under adverse weather conditions (i.e., northeastern wind direction, wind speed 60%, temperature inversion, and uniform pressure field).
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- 2019
20. Synthesis flower-like BiVO4/BiOI core/shell heterostructure photocatalyst for tetracycline degradation under visible-light irradiation
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Xin Xie, Yushan Si, Yonggang Liu, Chen Li, Yongyang Chen, Qishe Yan, and Menghan Zhang
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010302 applied physics ,Materials science ,Precipitation (chemistry) ,Composite number ,Heterojunction ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Adsorption ,Chemical engineering ,Specific surface area ,0103 physical sciences ,Photocatalysis ,Irradiation ,Electrical and Electronic Engineering ,Photodegradation - Abstract
A series of flower-like BiVO4/BiOI core/shell composites were synthesized by depositing BiOI irregular nanosheets on the surface of sphere-like BiVO4 particles via an in situ precipitation method. Tetracycline was selected to evaluate the photocatalytic activity under visible-light irradiation. The samples were characterized by series measurements, which the SEM and TEM results showed that the flower-like BiVO4/BiOI photocatalysts were fabricated. The BiVO4/BiOI (V: I = 0.1) composite exhibited the highest excellent photocatalytic activity and superior adsorption capability. The results could be ascribed to the p–n junction, close core/shell heterostructure and high specific surface area, which promoted the separation and transfer of photogenerated electron–hole pairs. In addition, the radical trapping experiments revealed that the ∙O2− and h+ were the main active species to the photodegradation of tetracycline in the system. This work provides a simple method to design the core/shell structure photocatalysts with excellent photocatalytic performance and adsorption capability for removal antibiotic pollutants.
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- 2019
21. Size-fractionated particulate elements in an inland city of China: Deposition flux in human respiratory, health risks, source apportionment, and dry deposition
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Shasha Yin, Ruiqin Zhang, Nan Jiang, Huaqing Ye, Shenbo Wang, and Qishe Yan
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China ,010504 meteorology & atmospheric sciences ,Health, Toxicology and Mutagenesis ,Coal combustion products ,010501 environmental sciences ,Toxicology ,01 natural sciences ,Atmosphere ,Flux (metallurgy) ,Air Pollution ,Metals, Heavy ,Humans ,Industry ,Cities ,Child ,Respiratory health ,0105 earth and related environmental sciences ,Inhalation exposure ,Air Pollutants ,Inhalation Exposure ,Size fractionated ,Dust ,General Medicine ,Particulates ,Pollution ,Coal ,Deposition (aerosol physics) ,Environmental chemistry ,Environmental science ,Particulate Matter ,Seasons ,Environmental Monitoring - Abstract
Size-resolved samples were collected using a 14-stage impactor during four seasons in Zhengzhou and analyzed for 26 elements to calculate the health risks from atmospheric particle-bound metals. High concentrations of heavy metals were observed in ultrafine (10.2 (Ni)–66.9 (Cd) ng m−3) or submicrometer (11.4 (Ni)–134 (Pb) ng m−3) mode in winter. Two size-dependent models were used to estimate the deposition of inhaled toxic metals in various regions of the human respiratory system. Results show that heavy metals deposited in the alveolar region ranged from 7.6 (As)–375 (Al) ng m−3 and were almost concentrated in ultrafine and fine modes. Cd (2.2–8.6) may cause accumulative non-carcinogenic health effects on children, and Cr (1.0 × 10−4–2.2 × 10−4) may lead to carcinogenic health risks for nearby residents around the sampling site. The major sources by principal component analysis that contributed to Cr and Cd in ultrafine and fine particles were coal combustion, vehicular and industrial emissions. The atmospheric dry deposition fluxes of Cr and Cd were between 0.7 and 1.9 μg m−2 day−1 calculated by a multi-step method. From the environmental and public health perspective, environmental agencies must control the emission of heavy metals in the atmosphere.
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- 2019
22. Enhanced photocatalytic performance of ZnFe2O4/BiOI hybrid for the degradation of methyl orange
- Author
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Xin Xie, Yushan Si, Shuxin Pei, Hongnan Du, Menghan Zhang, Xinyu Zhang, Qishe Yan, and Jie Gao
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010302 applied physics ,Materials science ,Scanning electron microscope ,Composite number ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Catalysis ,chemistry.chemical_compound ,chemistry ,0103 physical sciences ,Methyl orange ,Photocatalysis ,Hydrothermal synthesis ,Degradation (geology) ,Diffuse reflection ,Electrical and Electronic Engineering ,Nuclear chemistry - Abstract
The ZnFe2O4/BiOI hybrid photocatalysts were fabricated by the solvothermal method. The crystalline phase, morphologies composition and optical absorption property of the samples with different ZnFe2O4 contents were analyzed utilizing XRD, SEM, PL and UV–vis diffuse reflection spectrum, respectively. The photocatalytic activities of the as-prepared photocatalysts were evaluated by degrading methyl orange (MO) under visible light irradiation. Compared with pure BiOI and pure ZnFe2O4 catalyst, ZnFe2O4/BiOI hybrid photocatalysts could observably enhance photocatalytic activity and the 5% ZnFe2O4/BiOI composite performed the optimal degradation efficiency (81.2%) in 100 min. The kinetic studies indicated that the photo-degradation followed the first-order kinetic reaction model. Free radical trapping tests illustrated that ·O2− and h+ play the key roles in catalytic reaction. In consequence, the ZnFe2O4/BiOI composite can be widely used to treat organic pollutant in wastewater.
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- 2019
23. Facile construction for new core-shell Z-scheme photocatalyst GO/AgI/Bi
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Xin, Xie, Shenbo, Wang, Yongjiang, Zhang, Jie, Ding, Yonggang, Liu, Qishe, Yan, Siyu, Lu, Baojun, Li, Yushan, Liu, and Qiang, Cai
- Abstract
Heterojunction formation and morphology control have always been regarded as effective ways to improve the performance of visible-light-driven photocatalysts. In this study, a new facile strategy was applied to synthesize the Z-scheme GO/AgI/Bi
- Published
- 2020
24. Synthesis of Bi-Co0.5Zn0.5Fe2O4/AgBr hybrids with enhanced visible-light photocatalytic activity
- Author
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Qishe Yan, Yongyang Chen, Yushan Si, Menghan Zhang, and Xin Xie
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Materials science ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Photochemistry ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Hydrothermal circulation ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Catalysis ,Crystal ,Chemical state ,chemistry.chemical_compound ,X-ray photoelectron spectroscopy ,chemistry ,Photocatalysis ,Methyl orange ,Electrical and Electronic Engineering ,0210 nano-technology ,Absorption (electromagnetic radiation) - Abstract
The Bi-Co0.5Zn0.5Fe2O4/AgBr photocatalyst was fabricated by facile sol–gel and hydrothermal methods. The crystal phase, microstructures, morphologies composition, chemical states and optical absorption property were studied by XRD, SEM, XPS and UV–Vis diffuse reflection spectroscopy, respectively. The degradation capability for methyl orange was evaluated under visible light irradiation. The results show that the hybrid photocatalyst exhibited higher photocatalytic activity than pure AgBr, among which 15% Bi-Co0.5Zn0.5Fe2O4/AgBr (Bi-Co0.5Zn0.5Fe2O4/AgBr, 15%) emerge the highest degradation efficiency (85.2%) in an hour. The enhanced photocatalytic activity could be attributed to the enhancement of the visible absorption range. Free radicals trapping experiments reveal that ·OH plays a key role in catalytic action. Furthermore, the introducing of Bi-Co0.5Zn0.5Fe2O4/AgBr provides the composite a good photocatalytic property, which is expected to widely applied in water purification.
- Published
- 2018
25. Synthesis and characterization of Fe3O4/BiOI n-p heterojunction magnetic photocatalysts
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Xiaoxia Dong, Cuiping Lin, Wen Xiaoning, Yonggang Liu, Qishe Yan, and Xin Xie
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Materials science ,Scanning electron microscope ,Composite number ,General Physics and Astronomy ,Portable water purification ,Heterojunction ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,chemistry.chemical_compound ,chemistry ,X-ray photoelectron spectroscopy ,Chemical engineering ,Methyl orange ,Photocatalysis ,0210 nano-technology ,Photodegradation - Abstract
The visible-light-driven Fe3O4/BiOI n-p heterojunction photocatalysts were successfully synthesized by a facile and economical solve-thermal method. The as-prepared samples were systematically characterized by X-ray diffraction, scanning electron microscopy, N2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectra, and vibrating sample magnetometer. The methyl orange and sulfadiazine sodium salt were taken as the model pollutants to estimate the photocatalytic activities of the Fe3O4/BiOI composites with different Fe3O4 contents. The results revealed that the photocatalytic properties of photocatalysts within the appropriate loading range were superior to pure BiOI. Among them 7 wt% Fe3O4/BiOI composite exhibited the highest photocatalytic activity both on degradation of MO and SD-Na. The increase in photodegradation activity may be attributed to the moderate loading of Fe3O4, which could promote the separation of electron–hole pairs effectively. Furthermore, the introducing of Fe3O4 provides the composite a good magnetic property, which greatly promotes the practical application of Fe3O4/BiOI composite photocatalysts in water purification.
- Published
- 2018
26. Co0.5Zn0.5Fe2O4/Ag3PO4: A magnetic, highly efficient visible-light photocatalyst and the Z-scheme mechanism for removal of anionic dye and tetracycline hydrochloride
- Author
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Chen Li, Xin Xie, Qishe Yan, and Cuiping Lin
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Materials science ,Mechanical Engineering ,Dispersity ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Hydrothermal circulation ,0104 chemical sciences ,chemistry.chemical_compound ,Tetracycline Hydrochloride ,chemistry ,Mechanics of Materials ,Photocatalysis ,Methyl orange ,General Materials Science ,Absorption (chemistry) ,0210 nano-technology ,Photodegradation ,Nuclear chemistry ,Visible spectrum - Abstract
The magnetic Co0.5Zn0.5Fe2O4 incorporated Ag3PO4 photocatalysts were fabricated by facile sol-gel and hydrothermal route. The resulting Co0.5Zn0.5Fe2O4/Ag3PO4 composites were characterized by XRD, 1 SEM, 2 UV–vis DRS, 3 FT-IR 4 and VSM. 5 The results indicated that the magnetically separable composites with good dispersity showed a strong absorption in the uv–vis region and the saturation magnetization was 85.25 emu g−1. Anionic dye methyl orange (MO) and tetracycline hydrochloride (TCH) were used to evaluate the activity of the photocatalysts. The result revealed that the magnetic composites exhibited enhanced photocatalytic activity and stability under the visible light irradiation. The ·OH and ·O2- radicals were found to be the major active species during the photodegradation of TCH, while·O2- played the important role in photodegrading MO. And a Z-scheme mechanism for the enhanced photocatalytic process was proposed.
- Published
- 2018
27. Distribution and Source of Chemical Elements in Size-Resolved Particles in Zhengzhou, China: Effects of Regional Transport
- Author
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Qishe Yan, Ruiqin Zhang, Qun Wang, Shasha Yin, Shenbo Wang, Fei Yu, and Liuming Yang
- Subjects
Range (particle radiation) ,010504 meteorology & atmospheric sciences ,business.industry ,Air pollution ,Coal combustion products ,010501 environmental sciences ,Particulates ,medicine.disease_cause ,01 natural sciences ,Pollution ,Environmental chemistry ,medicine ,Environmental Chemistry ,Environmental science ,Coal ,Biomass burning ,Enrichment factor ,business ,0105 earth and related environmental sciences - Abstract
To investigate the characteristics of elements in size-segregated atmospheric particulates, samples were collected using a 14-stage electrical low-pressure impactor (ELPI+) at an urban site in Zhengzhou from October 1 till 25, 2016, and analyzed for 25 elements. Results show that crustal elements were concentrated in coarse particles and toxic elements were concentrated in ultra-fine particles. The size distributions of Na, Mg, Al, Si, Ca, Fe, Ti, S and Cl were uni-modal with dominant peaks in the size range of 1.43–2.14 µm or 0.295–0.487 µm. K, P, Mn and Ba exhibited bimodal distributions, and the remaining elements showed multimodal distributions. Enrichment factor, correlation and principal component analyses indicated that vehicles were the dominant source of particles. Biomass burning, coal combustion and dust also contributed to the accumulation of particles. The elemental concentrations affected by different air masses are discussed to investigate the effects of regional transport. An increase in elemental concentrations related to vehicle and coal sources was observed when air masses came from eastern areas. Furthermore, air masses from the southeast could be a major factor in air pollution for Zhengzhou during special times, such as periods of biomass burning or naked cropland. When air masses came from the northwest, the majority of elements from dust and coal combustion were lower in concentration compared with clean days, while elements originating from vehicle emissions increased.
- Published
- 2018
28. Preparation of magnetic Co 0.5 Zn 0.5 Fe 2 O 4 /AgBr hybrids for the visible-light-driven degradation of methyl orange
- Author
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Haodi Wang, Qishe Yan, Chen Li, Cuiping Lin, Shijia Liu, and Binbin Chu
- Subjects
Materials science ,Mechanical Engineering ,Heterojunction ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Photochemistry ,01 natural sciences ,Hydrothermal circulation ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,Photocatalysis ,Methyl orange ,Degradation (geology) ,General Materials Science ,0210 nano-technology ,Visible spectrum - Abstract
Co0.5Zn0.5Fe2O4/AgBr hybrids with p-n heterojunction were prepared by a facile sol-gel and hydrothermal method. And the samples with different AgBr contents were characterized by XRD, 1 SEM, 2 UV–vis DRS 3 and FT-IR. 4 The degradation capability of the photocatalysts were evaluated under visible light and used methyl orange (MO) as a target contaminant. All the composites possessed the magnetic properties of Co0.5Zn0.5Fe2O4 and also exhibited high photocatalytic activity of AgBr. Among the prepared photocatalysts, the hybrids prepared with 0.5 g AgNO3 exhibited the highest photocatalytic efficiency. The increase photocatalytic activity of Co0.5Zn0.5Fe2O4/AgBr hybrids might be associated with the formation of suitable internal structures between Co0.5Zn0.5Fe2O4 and AgBr. And a possible photocatalytic mechanism of the Co0.5Zn0.5Fe2O4/AgBr hybrids was proposed.
- Published
- 2018
29. Dual Z-scheme 2D/3D carbon-bridging modified g-C3N4/BiOI-Bi2O3 composite photocatalysts for effective boosting visible-light-driven photocatalytic performance
- Author
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Qishe Yan, Siyu Zhang, Yuhao Zeng, Yanning Shao, Xin Xie, Tongtong Zhang, Yuqi Wang, and Zhongjun Li
- Subjects
Materials science ,Kinetics ,Composite number ,chemistry.chemical_element ,Filtration and Separation ,Heterojunction ,Analytical Chemistry ,law.invention ,Bismuth ,Catalysis ,Chemical engineering ,chemistry ,law ,Photocatalysis ,Calcination ,Visible spectrum - Abstract
A dual Z-scheme carbon-bridged g-C3N4/BiOI-Bi2O3 photocatalyst were synthesized by simple solvothermal and calcination methods. The physical and chemical properties of prepared samples were explored via a series of characterization and Density Functional Theory (DFT) calculations. The formation mechanism of the composite photocatalyst was systematically studied and the formation process was simulated. Under the irradiation of visible light, 10% carbon-bridged g-C3N4/BiOI-Bi2O3 exhibited the best photocatalytic performance. And the kinetics reaction model was followed pseudo-first-order kinetics. Moreover, the possible TC degradation pathways were established based on LC-MS. The enhanced photocatalytic activity was mainly attributed to the dual Z-scheme heterojunction formed by carbon-bridged g-C3N4 deposition on the surface of Bi2O3 and BiOI and a higher charge transfer rate of carbon-bridged g-C3N4, which effectively promoted the separation and transfer of electron-hole pairs. The trapping experiments were carried out to further explore its photocatalytic mechanism. This work provided an in-depth understanding of g-C3N4 and bismuth-based catalysts.
- Published
- 2021
30. A research on shape-controllable synthesis of Ag3PO4/AgBr and its degradation of ciprofloxacin
- Author
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Yalei Zhao, Jingran Chen, Xingyu Yang, Xin Xie, Chenyu Zhu, Qishe Yan, and Cuiping Lin
- Subjects
Ammonium bromide ,Environmental Engineering ,Materials science ,Diffuse reflectance infrared fourier transform ,Band gap ,Scanning electron microscope ,Precipitation (chemistry) ,02 engineering and technology ,010501 environmental sciences ,021001 nanoscience & nanotechnology ,01 natural sciences ,chemistry.chemical_compound ,chemistry ,X-ray crystallography ,Photocatalysis ,0210 nano-technology ,Photodegradation ,0105 earth and related environmental sciences ,Water Science and Technology ,Nuclear chemistry - Abstract
Antibiotic ciprofloxacin is one of the commonly used broad spectrum fluoroquinolone human and veterinary drugs. Because of the overuse of human beings, the presence of ciprofloxacin has been detected in a variety of environmental matrices. To solve this problem, a facile, environmentally-friendly Ag3PO4/AgBr composite photocatalyst was synthesized by a simple precipitation method at room temperature in the presence of cetyltrimethyl ammonium bromide (CTAB). CTAB was served as surfactant and the source of bromide ions. The as-prepared Ag3PO4/AgBr microspheres were characterized by means of powder X-ray diffraction (XRD), scanning electron microscope (SEM) and UV-visible diffuse reflectance spectroscopy (UV-vis DRS). The results revealed that the Ag3PO4/AgBr sample (synthesized with CTAB, 0.8 g) exhibited the highest photocatalytic activity to the photodegradation rate of 96.36%. Moreover, mechanism detection experiment indicated that h+ was the major active species in the degradation process. So the enhanced photocatalytic activity of Ag3PO4/AgBr composites is attributed to its excellent separation of photogenerated electron-hole pairs through Ag3PO4/AgBr heterojunction. Also, Ag3PO4/AgBr heterojunction has a lower band gap compared to pure Ag3PO4 and pure AgBr, so higher efficiency of light harvesting is equipped.
- Published
- 2017
31. Visible light response AgBr/Ag3PO4 hybrid for removal of anionic dye and tetracycline hydrochloride in water
- Author
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Qishe Yan, Yalei Zhao, Menghan Zhang, Cuiping Lin, and Chen Li
- Subjects
Materials science ,Absorption spectroscopy ,Diffuse reflectance infrared fourier transform ,Scanning electron microscope ,Inorganic chemistry ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Tetracycline Hydrochloride ,X-ray photoelectron spectroscopy ,Photocatalysis ,Electrical and Electronic Engineering ,0210 nano-technology ,Photodegradation ,Visible spectrum - Abstract
The AgBr/Ag3PO4 obtained under the condition of pH 7.0, 453 K and reaction of 12 h was a visible-light response catalyst and the absorption spectrum ranges from 200 to 560 nm.The as-fabricated samples were characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, Scanning electron microscopy, UV–Vis diffuse reflectance spectroscopy. Compared with bare Ag3PO4 or AgBr, it displayed much higher photocatalytic property for tetracycline hydrochloride (TC) degradation under visible light. The main element nitrogen ions were changed into NO3 − and NH4 +, and chloridion ion presumably formed AgCl precipitation or some oxidation state of chloridion during the photodegradation process, the rate of TC photodegradation and mineralization can reach 96.1 and 60.1%, respectively.
- Published
- 2017
32. Ag/γ-AgI/Bi2O2CO3/Bi S-scheme heterojunction with enhanced photocatalyst performance
- Author
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Wenbo Cui, Yang Zhang, Yiwen Fu, Haoran Wang, Shuyi Wang, and Qishe Yan
- Subjects
Materials science ,business.industry ,Scattering ,Filtration and Separation ,Heterojunction ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Analytical Chemistry ,Semiconductor ,020401 chemical engineering ,Photocatalysis ,Optoelectronics ,Degradation (geology) ,Charge carrier ,0204 chemical engineering ,Surface plasmon resonance ,0210 nano-technology ,business ,Visible spectrum - Abstract
The metal defect engineering is the crux to accomplish the goal of local electronic regulation, which is an important factor for visible light to drive photocatalyst performance. In this paper, the solvothermal-precipitation method was used to reduce Bi in situ via the reducer glucose to construct Ag-AgI/Bi-Bi2O2CO3-OVs heterojunction. The Ag-AgI/Bi-Bi2O2CO3-OVs composite photocatalyst has excellent photoresponse ability and fast charge carrier separation. In addition, the powerful S-scheme heterojunction retains the original redox capability of the components. The unique lawn-like structure exhibits favorable surface scattering and reflection, which promotes efficient separation of photoinduced charge carriers. Especially, 30% Ag-AgI/Bi-Bi2O2CO3-OVs exhibits brilliant photocatalytic performance for the degradation of tetracycline, which is 4.85 times and 1.15 times higher than the original Bi2O2CO3 and AgI, respectively. The enhanced photocatalytic activity mainly attributes to the presence of oxygen vacancies, the sensitization of Ag-AgI, the double surface plasmon resonance (SPR) effect, and the heterogeneous interface due to the improved morphology, which effectively inhibits the recombination of electron-hole pairs. This work provides a new perspective for the reasonable construction and simple synthesis of high-performance Bi-based semiconductor photocatalysts.
- Published
- 2021
33. Synthesis of graphene oxide/Ag3PO4 composite with enhanced visible-light photocatalytic activity
- Author
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Qishe Yan, Yonggang Liu, Cuiping Lin, Shenbo Wang, Yalei Zhao, and Xin Xie
- Subjects
Materials science ,Nanocomposite ,Diffuse reflectance infrared fourier transform ,Graphene ,Scanning electron microscope ,Oxide ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,law.invention ,chemistry.chemical_compound ,chemistry ,law ,Photocatalysis ,Methyl orange ,Irradiation ,Electrical and Electronic Engineering ,0210 nano-technology ,Nuclear chemistry - Abstract
The nano-scale Ag3PO4 was successfully synthesized by the silver ammonia complexing precipitation method at room temperature. And the Graphene oxide (GO)/Ag3PO4 nanocomposites with different contents of GO were successfully synthesized using the electrostatic driving method. The as-prepared GO/Ag3PO4 nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV–visible diffuse reflectance spectroscopy (UV–Vis DRS), confirming that Ag3PO4 were highly dispersed to GO sheet. The photocatalytic properties of GO/Ag3PO4 were evaluated by the degradation of Methyl Orange (MO) under visible light irradiation and solar irradiation respectively. The results showed that the photocatalytic efficiencies of GO/Ag3PO4 nanocomposites had enhanced largely and the kinetics reaction models were followed first-order. Furthermore, 5% GO/Ag3PO4 exhibited the highest photocatalytic activity on degradation of MO under visible-light irradiation. The improved photocatalytic performances of the GO/Ag3PO4 nanocomposites mainly attributed to the introducing of GO, which benefit for electron transfer and inhibit the recombination of electron–hole pairs, promoting the practical application of Ag3PO4 in water purification.
- Published
- 2017
34. Magnetically separable CuFe2O4/AgBr composite photocatalysts: Preparation, characterization, photocatalytic activity and photocatalytic mechanism under visible light
- Author
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Cuiping Lin, Yonggang Liu, Huijie Bi, Qishe Yan, and Yalei Zhao
- Subjects
Quenching (fluorescence) ,Materials science ,Scanning electron microscope ,General Physics and Astronomy ,Nanotechnology ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Hydrothermal circulation ,0104 chemical sciences ,Surfaces, Coatings and Films ,chemistry.chemical_compound ,X-ray photoelectron spectroscopy ,chemistry ,Photocatalysis ,Methyl orange ,Diffuse reflection ,0210 nano-technology ,Visible spectrum ,Nuclear chemistry - Abstract
The CuFe2O4 and CuFe2O4/AgBr composites with different CuFe2O4 contents were prepared by a facile sol-gel and hydrothermal method, respectively. The as-synthesized photocatalysts were characterized by means of powder X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflectance spectrum (UV–vis DRS). Their magnetic properties, photocatalytic degradation activities on methyl orange (MO) and tetracycline hydrochloride (TC) solution and photocatalytic mechanism were investigated in detail. The results revealed that the CuFe2O4/AgBr composites exhibited significantly higher photocatalytic activities than the pure CuFe2O4. The enhanced photocatalytic activity could be attributed to the matched band structure of two components and more effective charge transportation and separations. In addition, the quenching investigation of different scavengers demonstrated that h+, OH, O2− reactive species played different roles in the decolorization of MO and degradation of TC.
- Published
- 2017
35. Constructing a new Z-scheme multi-heterojunction photocataslyts Ag-AgI/BiOI-Bi
- Author
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Qishe, Yan, Xin, Xie, Yonggang, Liu, Shenbo, Wang, Menghan, Zhang, Yongyang, Chen, and Yushan, Si
- Abstract
The series Ag-AgI/BiOI-Bi
- Published
- 2019
36. Constructing a Z-scheme 3D hollow pineal-like AgBr/Bi2O2CO3 hybrid material based on ameliorated p-n heterostructure towards exorbitant photocatalytic performance
- Author
-
Chengyang Xu, Qishe Yan, Yang Zhang, Menghan Zhang, Peiying Wang, and Yiwen Fu
- Subjects
Materials science ,Mechanical Engineering ,Schottky barrier ,Metals and Alloys ,Nanoparticle ,Heterojunction ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Silver bromide ,01 natural sciences ,0104 chemical sciences ,Catalysis ,chemistry.chemical_compound ,Chemical engineering ,X-ray photoelectron spectroscopy ,chemistry ,Mechanics of Materials ,Materials Chemistry ,Photocatalysis ,0210 nano-technology ,Hybrid material - Abstract
Interfacial charge transfer acts as a linchpin role in the research of photogenerated carrier recombination and photocatalysis. In this work, AgBr/Bi2O2CO3 was constructed to explore the structure-activity relationship between heterostructure and catalytic mechanism. The excellent photosensitizer silver bromide nanoparticles were immobilized on the surface of the Bi2O2CO3 hollow pineal-like via a simple hydrothermal method and deliberated the formation mechanism of the heterostructure. The heterostructures were characterized through XRD, BET, XPS, SEM, TEM, EDX, UV–Vis DRS, EIS, PT and TOC. Research demonstrates that owing to the distinct layered structure exhibits fine surface scattering and reflection. It has excellent degradation performance for dyes and PPCPs wastewater and can be completely degraded in a short time. Simultaneously, the introduction of the Z-type mechanism into the p-n type heterojunction photocatalyst, together with the joint contribution of the Schottky barrier, extremely facilitates the charge separation, illustrating brilliant photocatalysis active. Furthermore, Free radical capture experiments certificate that •O2− and h+ are the chief active species in the decomposition of organic pollutants, and the potential photocatalytic mechanism is considered. The consequences of this work will furnish a fresh perspective for the configuration of high-performance visible light-responsive photocatalysts.
- Published
- 2021
37. CuBi2O4 and rGO co-modified 3D hierarchical flower-like Bi5O7I nanoflakes as Z-scheme heterojunction for enhanced photocatalytic performance
- Author
-
Ke Yan, Tongtong Zhang, Peiying Wang, Chengyang Xu, Qishe Yan, Xiaohong Zhou, and Yiwen Fu
- Subjects
Materials science ,Graphene ,Radical ,Oxide ,Filtration and Separation ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Analytical Chemistry ,Catalysis ,law.invention ,chemistry.chemical_compound ,020401 chemical engineering ,X-ray photoelectron spectroscopy ,Chemical engineering ,chemistry ,law ,Photocatalysis ,Rhodamine B ,0204 chemical engineering ,0210 nano-technology ,Photodegradation - Abstract
The three-dimensional (3D) flower-shaped layered Bi5O7I nanosheets exhibited tremendous potential in wiping out hazardous organics of sewage due to appropriate band structure and rich surface for attachment of reactants, modified with CuBi2O4 (CBO) and reduced graphene oxide (rGO) further enhancing its photocatalytic effects. Herein, a novel, stabilized and efficient CBO/Bi5O7I@rGO photocatalyst was constructed via sequential hydrothermal process, and the microstructures, physicochemical and optical properties were further researched by serial means such as XRD, XPS, FESEM-EDS, TEM, UV–vis DRS, PT, EIS and physical absorption. SEM and TEM manifested that the composite was successfully prepared and gossamer rGO as a co-catalyst, which is not only conducive to the separation of photo-generated carrier but also facilitates photocatalytic removal pollutants. Furthermore, the photodegradation tests indicated that CBO/Bi5O7I@1.5% rGO sample displayed the highest removal rates towards contaminations such as tetracycline hydrochloride (91%), Rhodamine B (77%) and ciprofloxacin (92%) under visible-light, respectively. Besides, the addition of higher initial concentrations and certain anions inhibited photocatalytic efficiency, which perhaps was due to greater competition with contaminations towards active radicals. Finally, the capture experiment and electron spin resonance (ESR) test certified that superoxide radicals ( · O 2 - ) are the direct active group, whereas the holes (h+) and hydroxyl radicals ( · OH) exert a supporting role. This work could offer an actual and doable design for constructing of efficient Z-scheme system using rGO as an auxiliary catalyst to sewage remediation.
- Published
- 2021
38. Nickel-Doping accelerated charge separation in flower ball-like Bi4O5I2 for efficient visible-light photocatalytic performance
- Author
-
Peiying Wang, Yiwen Fu, Xiaohong Zhou, Yuhao Zeng, Tongtong Zhang, Chengyang Xu, and Qishe Yan
- Subjects
Materials science ,Scanning electron microscope ,Doping ,General Physics and Astronomy ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Nanomaterials ,symbols.namesake ,X-ray photoelectron spectroscopy ,Chemical engineering ,Specific surface area ,Photocatalysis ,symbols ,0210 nano-technology ,Raman spectroscopy ,Visible spectrum - Abstract
Ion-doped semiconductor photocatalysts were considered to be an important strategy to improve photocatalytic performance. A simple one-step solvothermal method was used to prepare flower ball-shaped Bi4O5I2 nanomaterials modified by Nickel. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectra, photocurrent response and EIS Nyquist plots were used to explore its structural composition and photoelectrochemical properties. The photocatalytic activity was studied by simulating the degradation of tetracycline under visible light. The degradation results showed that photocatalytic effect of 5 wt% Ni-doped Bi4O5I2 was the best among the samples, and the degradation rate was 91%. The capture experiment shown that the vital active radical is O2–. The final results shown that Ni-doping improved the charge separation efficiency and the specific surface area of the material, and it is proved by Raman that Ni-doping formed shallow traps on the surface of Bi4O5I2, which promoted the separation and transfer of carriers and improved the photocatalytic activity. This work can provide a reference for the subsequent development of bismuth-based photocatalysts.
- Published
- 2021
39. Facile construction of 3D hierarchical flake ball-shaped γ-AgI/Bi2WO6 Z-scheme heterojunction towards enhanced visible-light photocatalytic performance
- Author
-
Peiying Wang, Yuyang Cao, Xiaohong Zhou, Chengyang Xu, and Qishe Yan
- Subjects
Materials science ,General Physics and Astronomy ,Nanoparticle ,Heterojunction ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Redox ,Hydrothermal circulation ,0104 chemical sciences ,Surfaces, Coatings and Films ,law.invention ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,law ,Photocatalysis ,Rhodamine B ,0210 nano-technology ,Photodegradation ,Electron paramagnetic resonance - Abstract
In this work, a series of 3D hierarchical γ-AgI/Bi2WO6 (AB) Z-scheme heterojunctions with intimate interface contact was synthesized by facile hydrothermal and precipitation method. The optimal proportion of γ-AgI/Bi2WO6 exhibited superior photocatalytic property during the removal of Rhodamine B (RhB), tetracycline (TC) and ciprofloxacin (CIP). The outstanding photocatalytic capability was probably responsible for the intimate contact among Bi2WO6 flake ball-shaped and γ-AgI nanoparticle, which could heighten the responsive range of visible-light, promote the separation of photo-generated carriers and fully utilize the strong redox ability of composites. Additionally, the function of active species in the photodegradation was also researched through exploiting trapping tests and electron spin resonance experiments to reveal the vital effect of holes (h+) and superoxide anion radicals ( O2−). Moreover, the possible Z-scheme photocatalytic mechanism with an internal electric field was also proposed. This study spreads an effective strategy for reasonably devising the Bi2WO6-based photocatalytic system to decontaminate multiple pollutants.
- Published
- 2020
40. Efficient photocatalytic degradation of tetracycline hydrochloride by Ag3PO4 under visible-light irradiation
- Author
-
Cuiping Lin, MengMeng Xu, Qishe Yan, Hu Jifei, Yonggang Liu, and Ruiqin Zhang
- Subjects
Light ,Diffuse reflectance infrared fourier transform ,Scanning electron microscope ,Health, Toxicology and Mutagenesis ,Inorganic chemistry ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Catalysis ,Phosphates ,Tetracycline Hydrochloride ,X-Ray Diffraction ,X-ray photoelectron spectroscopy ,Environmental Chemistry ,Precipitation (chemistry) ,Chemistry ,Photoelectron Spectroscopy ,Silver Compounds ,General Medicine ,Tetracycline ,021001 nanoscience & nanotechnology ,Pollution ,0104 chemical sciences ,X-ray crystallography ,Microscopy, Electron, Scanning ,Photocatalysis ,0210 nano-technology - Abstract
A facile, environmental-friendly Ag3PO4-PN photocatalyst was synthesized by a simple precipitation method at room temperature in the presence of ammonia and polyvinyl pyrrolidone (PVP). As-synthesized samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-visible diffuse reflectance spectroscopy (UV-vis DRS). The enhancement of photocatalytic efficiency of Ag3PO4-PN is strongly dependent on the excellent photo-absorption capacity, sharp edges and corners, and synergistic effect of PVP and NH3·H2O. The effects of catalyst dosage, TC concentration and solution pH were explored with tetracycline hydrochloride (TC) as target contamination. The mineralization was evaluated by total organic carbon (TOC) analysis and determination of the concentration of inorganic ions such as NO3 (-) and Cl(-). Radical detection experiment indicated the h(+) and ·O(2-) are major active species in the degradation of TC by Ag3PO4-PN. Moreover, photocatalyst stability and regeneration experiments exhibited the favorable stability and rejuvenation ability, suggesting a promising prospect of practical application of Ag3PO4 in the wastewater treatment.
- Published
- 2016
41. Hierarchical self-assembly of graphene-bridged on AgIO3/BiVO4: An efficient heterogeneous photocatalyst with enhanced photodegradation of organic pollutant under visible light
- Author
-
Yushan Si, Qishe Yan, Tongtong Zhang, Yongyang Chen, Fenfang Zuo, Yiwen Fu, and Xinyu Zhang
- Subjects
Materials science ,Graphene ,Mechanical Engineering ,Metals and Alloys ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,X-ray photoelectron spectroscopy ,chemistry ,Mechanics of Materials ,law ,Materials Chemistry ,Rhodamine B ,Photocatalysis ,Degradation (geology) ,Self-assembly ,0210 nano-technology ,Photodegradation ,Visible spectrum - Abstract
A series of hierarchical AgIO3/BiVO4-GO photocatalysts was synthesized using a solvothermal-precipitation method. The composition, structure, morphology, optical and photoelectrochemical performance of as-obtained photocatalysts were systematically characterized by XPS, XRD, TEM, SEM, EDS, PL, UV–Vis DRS, PT, and EIS, respectively. The photocatalytic activity was evaluated by the degradation of tetracycline hydrochloride (TC) and Rhodamine B (RhB) under visible light irradiation. Experimental results exhibited the photocatalytic degradation activity of AgIO3/BiVO4 was significantly improved compared with pure AgIO3 and BiVO4. This may be due to the heterojunction formation of AgIO3 and BiVO4 and the introduction of GO, which accelerates the separation and migration of electron-hole pairs and reduce recombination. The h+ and •O2− was the key active species in the photocatalytic degradation process according to the trapping experiment. Furthermore, a potential photocatalytic mechanism was predicted based on experimental results.
- Published
- 2020
42. Emission characteristics and potential toxicity of polycyclic aromatic hydrocarbons in particulate matter from the prebaked anode industry
- Author
-
Yi-Shun Zhang, Qing-Yan Zhao, Qishe Yan, Shi-Jie Han, Rui-Dong He, Jia Wang, Ruiqin Zhang, and Meng-Jie Jin
- Subjects
Total organic carbon ,Environmental Engineering ,010504 meteorology & atmospheric sciences ,Chemistry ,Central china ,010501 environmental sciences ,Particulates ,01 natural sciences ,Pollution ,Anode ,Environmental chemistry ,Environmental Chemistry ,Chimney ,Emission inventory ,Elemental carbon ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Potential toxicity - Abstract
The emission factors (EFs) and source profiles of polycyclic aromatic hydrocarbons (PAHs) in particulate matter (PM10 and PM2.5) from the prebaked anode industry were studied to fill the knowledge gap and provide data for emission inventory and source resolution. In 2018, three prebaked anode plants were selected in Central China, each having one calcining chimney as well as one baking chimney, and then 92 samples were collected from the stack gas of the six chimneys. The results of the study are as follows. (1) PM10 and PM2.5 from the prebaked anode industry contained 37–42% water-soluble ions, 16–20% elements, 11–17% organic carbon, and 9.2–14% elemental carbon. (2) The EFs for PAHs of PM10 and PM2.5 were 1146.1 ± 899.7 and 866.2 ± 1179.8 mg/(t aluminum produced), respectively. The EF for BaP was seven times lower than that given by the European Environment Agency (EEA), whereas those of BbF, BkF, and IcdP were 2–13 times higher than those given by the EEA. (3) Seven diagnostic ratios for PAHs, including Ant/(Ant+Phe), Flua/(Flua+Pyr), BaA/(BaA + Chr), IcdP/(IcdP+BghiP), Flu/(Flu+Pyr), Phe/Ant and BaA/Chr were discussed. Just by diagnostic ratio, it is hard to precisely distinguish between calcining and baking in prebaked industry. (4) The toxic equivalence of PMs in the baking stack gas in the prebaked anode industry was five times higher than that in the calcining stack gas, and PM2.5 showed higher potential toxicity risk than PM10.
- Published
- 2020
43. Characteristics and formation mechanisms of secondary inorganic ions in PM2.5 during winter in a central city of China: Based on a high time resolution data
- Author
-
Shenbo Wang, Shengli Li, Liuming Yang, Shiguang Duan, Qishe Yan, Ruiqin Zhang, and Nan Jiang
- Subjects
Pollution ,Atmospheric Science ,010504 meteorology & atmospheric sciences ,media_common.quotation_subject ,chemistry.chemical_element ,010501 environmental sciences ,Inorganic ions ,Particulates ,01 natural sciences ,Nitrogen ,chemistry.chemical_compound ,Nitrate ,chemistry ,Environmental chemistry ,Mass concentration (chemistry) ,Equivalent concentration ,Sulfate ,0105 earth and related environmental sciences ,media_common - Abstract
This study aimed to investigate the characteristics of the water-soluble ions concentrations in atmospheric particulates. Highly time-resolved measurements of inorganic ions associated with PM2.5 were conducted from December 1, 2017 to February 28, 2018 in Zhengzhou. The hourly mean and standard deviation of PM2.5 concentration during the observation episodes were 108.2 ± 80.7 μg/m3. The hourly mass concentration of PM2.5 increased from 8 μg/m3 to 438 μg/m3 throughout the entire observation. The proportion of water-soluble inorganic ions in PM2.5 was 52.5% throughout the entire observation period. The ions existed mainly in the form of (NH4)2SO4 and NH4NO3. The average mass concentration ratio of NO3− to SO42− was 1.9 ± 0.8 throughout the entire observation period, which initially increased and then decreased with the increased pollution level. The average ratio of the molar equivalent concentration of [NH4+] to that of [NO3− + SO42−] was 1.14 ± 0.27, which decreased with the increased pollution level. Homogeneous reactions played an important role in the formation of nitrate, while, the heterogeneous reactions were important in the formation of sulfate. Both of the values of sulfur oxidation ratios (SOR) and nitrogen oxidation ratios increased with relative high humidity (RH) condition; especially, the SOR values sharply increased when the RH was above 50%. The results of potential source contribution function model demonstrated that the western and northeastern regions of Zhengzhou had a greater influence on PM2.5 pollution in Zhengzhou. All these results suggested that reducing the emission of precursors of secondary inorganic ions was highly important in controlling PM2.5 pollution in Zhengzhou.
- Published
- 2020
44. Insight into the formation of secondary inorganic aerosol based on high-time-resolution data during haze episodes and snowfall periods in Zhengzhou, China
- Author
-
Liuming Yang, Shenbo Wang, Nan Jiang, Qing-Yan Zhao, Shasha Yin, Ruiqin Zhang, Qishe Yan, Leishi Zhang, and Xiaoyan Tang
- Subjects
Environmental Engineering ,Haze ,010504 meteorology & atmospheric sciences ,010501 environmental sciences ,complex mixtures ,01 natural sciences ,Pollution ,Aerosol ,Atmosphere ,chemistry.chemical_compound ,chemistry ,Nitrate ,Environmental chemistry ,Environmental Chemistry ,Mass concentration (chemistry) ,Relative humidity ,Ammonium ,Sulfate ,Waste Management and Disposal ,0105 earth and related environmental sciences - Abstract
Episodic haze is frequently observed in Zhengzhou, China. Such haze typically contains secondary inorganic aerosols. In this paper, we explore the formation mechanisms of sulfate, nitrate, and ammonium (SNA) in Zhengzhou from January 3 to 25, 2018 based on the results of a series of online instruments and a size-segregated filter sampler. Our results document the remarkable contributions of SNA to winter haze episodes in Zhengzhou, where they account for about 50% of PM2.5 mass concentration. SNA were mainly concentrated in droplet-mode particles, which increased remarkably with the aggravation of the haze episode. In addition, KNO3 and NaNO3 were formed in droplet-mode particles and coarse-mode particles respectively with increasing PM2.5 concentration. The atmosphere during the observation period was ammonia-rich, and the aerosol was acidic under high PM2.5 concentration. Homogeneous reactions dominated the formation of nitrate. HONO photolysis played a more important role in the origin of OH radicals when O3 decreased during haze episode. Under high relative humidity (RH), nitrate formation was influenced by heterogeneous hydrolysis reactions of N2O5. Sulfates were mainly formed through aqueous-phase reactions, especially when the RH was higher than 60%. Under these conditions, there were amounts of liquid water content existed in aerosols. Finally, we observed enhanced conversion of SO2 and NO2 during snowfall periods. This effect may be attributable to the higher RH and O3 levels despite the unfavorable effects of wet deposition and low concentrations of gaseous precursors.
- Published
- 2018
45. Constructing a novel hierarchical β-Ag2MoO4/BiVO4 photocatalyst with Z-scheme heterojunction utilizing Ag as an electron mediator
- Author
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Qishe Yan, Peiying Wang, Yushan Si, Xin Xie, and Yongyang Chen
- Subjects
Electron mediator ,Materials science ,Precipitation (chemistry) ,General Physics and Astronomy ,Portable water purification ,Heterojunction ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,chemistry.chemical_compound ,Chemical engineering ,X-ray photoelectron spectroscopy ,chemistry ,Photocatalysis ,Rhodamine B ,Degradation (geology) ,0210 nano-technology - Abstract
A novel β-Ag2MoO4/BiVO4 heterojunction photocatalyst was synthesized via a simple precipitation method. The photocatalytic activity of photocatalysts was assessed by RhB (Rhodamine B) and TC (tetracycline hydrochloride) degradation. Furthermore, the Ag nanoparticles were produced during the photocatalytic degradation process facilitates the construction of Z-scheme system. The XRD, XPS, SEM, EDX, TEM, HR-TEM and BET measurements revealed the structure and morphology properties and the UV–Vis DRS, PL, PT and EIS were used to investigate the optical properties. The results exhibited that the β-Ag2MoO4/BiVO4 heterojunction photocatalyst possess higher photocatalytic activity than individual BiVO4 and β-Ag2MoO4. Furthermore, h+ was the most crucial active species in the β-Ag2MoO4/Ag/BiVO4 Z-scheme system according to the reactive species trapping experiments. The potential Z-scheme photocatalytic mechanism also was discussed based on experimental and characterization results. This work shows a simple method to construct Z-scheme heterojunction photocatalyst by self-assembly and demonstrates that photocatalytic technology has great application prospects for water purification.
- Published
- 2019
46. A research on shape-controllable synthesis of Ag
- Author
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Jingran, Chen, Xingyu, Yang, Chenyu, Zhu, Xin, Xie, Cuiping, Lin, Yalei, Zhao, and Qishe, Yan
- Subjects
Bromides ,Photolysis ,X-Ray Diffraction ,Cetrimonium ,Ciprofloxacin ,Cetrimonium Compounds ,Silver Compounds ,Waste Disposal, Fluid ,Catalysis ,Water Pollutants, Chemical ,Phosphates - Abstract
Antibiotic ciprofloxacin is one of the commonly used broad spectrum fluoroquinolone human and veterinary drugs. Because of the overuse of human beings, the presence of ciprofloxacin has been detected in a variety of environmental matrices. To solve this problem, a facile, environmentally-friendly Ag
- Published
- 2018
47. Efficient visible-light photocatalytic degradation of sulfadiazine sodium with hierarchical Bi7O9I3 under solar irradiation
- Author
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Qishe Yan, MengMeng Xu, and Yalei Zhao
- Subjects
Environmental Engineering ,medicine.diagnostic_test ,Chemistry ,Scanning electron microscope ,Inorganic chemistry ,Sulfadiazine Sodium ,law.invention ,chemistry.chemical_compound ,X-ray photoelectron spectroscopy ,law ,Spectrophotometry ,medicine ,Photocatalysis ,Diffuse reflection ,Crystallization ,Ethylene glycol ,Water Science and Technology ,Nuclear chemistry - Abstract
Bi7O9I3, a kind of visible-light-responsive photocatalyst, with hierarchical micro/nano-architecture was successfully synthesized by oil-bath heating method, with ethylene glycol as solvent, and applied to degrade sulfonamide antibiotics. The as-prepared product was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflection spectra and scanning electron microscopy (SEM). XRD and XPS tests confirmed that the product was indeed Bi7O9I3. The result of SEM observation shows that the as-synthesized Bi7O9I3 consists of a large number of micro-sheets with parallel rectangle structure. The optical test exhibited strong photoabsorption in visible light irradiation, with 617 nm of absorption edges. Moreover, the difference in the photocatalytic efficiency of as-prepared Bi7O9I3 at different seasons of a whole year was investigated in this study. The chemical oxygen demand removal efficiency and concentration of NO3− and SO42– of solution after reaction were also researched to confirm whether degradation of the pollutant was complete; the results indicated a high mineralization capacity of Bi7O9I3. The as-synthesized Bi7O9I3 exhibits an excellent oxidizing capacity of sulfadiazine sodium and favorable stability during the photocatalytic reaction.
- Published
- 2015
48. Degradation of Sulfadimethoxine and Products in Aqueous Solution by BiOI Under Visible Light with H2O2
- Author
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Luyun Zhang, Yanyan Wang, Qishe Yan, and Ruiqin Zhang
- Subjects
Aqueous solution ,Chemical oxygen demand ,chemistry.chemical_element ,Sulfadimethoxine ,Photochemistry ,Sulfur ,Inorganic Chemistry ,chemistry ,Photocatalysis ,medicine ,Degradation (geology) ,Physical and Theoretical Chemistry ,Photodegradation ,Visible spectrum ,medicine.drug - Abstract
A visible light-induced BiOI photocatalytic process was used to degrade sulfadimethoxine (SDM). The highest degradation efficiency of SDM was 96% after 2 h of visible light irradiation. The chemical oxygen demand (COD) of the solution decreased substantially and the high COD removal achieved 88%. During this time, the organic sulfur was recovered in the form of sulfate and the organic nitrogen was retrieved in the form of nitrate. Moreover, the high photodegradation efficiency and the less toxic photodegradation products suggest BiOI is a likely photocatalyst for the degradation of SDM under visible light.
- Published
- 2015
49. Large-scale synthesis and enhanced visible-light-driven photocatalytic performance of hierarchical Ag/AgCl nanocrystals derived from freeze-dried PVP–Ag+ hybrid precursors with porosity
- Author
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Qishe Yan, Lianfang Ge, Minna Liu, Daoyuan Yang, Bingbing Fan, Lian Gao, Hailong Wang, Deliang Chen, Qianqian Chen, Hongxia Lu, Jing Sun, Guosheng Shao, and Rui Zhang
- Subjects
Materials science ,Process Chemistry and Technology ,Nanotechnology ,Catalysis ,Propanol ,chemistry.chemical_compound ,chemistry ,Nanocrystal ,Chemical engineering ,Photocatalysis ,Methanol ,Photodegradation ,Porosity ,Plasmon ,General Environmental Science ,Visible spectrum - Abstract
a b s t r a c t To achieve high-performance, hierarchical plasmonic Ag/AgCl photocatalysts, a freeze-drying route was developed to form porous PVP-Ag + hybrid compounds, which were then transformed to hierarchical Ag/AgCl nanocrystals through a liquid-solid precipitation reaction followed by a partially photoreduction under ambient conditions. The PVP-Ag+ hybrid precursors and their final Ag/AgCl nanocrystals obtained were characterized by various techniques. The hierarchical Ag/AgCl nanocrystals obtained had an appar- ent size range of 156 ± 50 nm, and the surfaces of the large particles were covered with small nanocrystals with sizes of 33 ± 12 nm. The photocatalytic performance of the hierarchical Ag/AgCl nanocrystals was estimated by degradating organic dyes (i.e., RhB, MO, and MB) and alcohols (i.e., methanol and iso- propanol) under visible light (� ≥ 420 nm) and sunlight. The results indicated that the hierarchical Ag/AgCl nanocrystals obtained were efficient visible-light-driven photocatalysts in decomposing organic dyes, and their RhB photodegradation rates (∼0.97 min −1 ) was ∼54 times higher than that (∼0.018 min −1
- Published
- 2014
50. Efficient visible-light photocatalytic degradation of sulfadiazine sodium with hierarchical Bi₇O₉I₃under solar irradiation
- Author
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MengMeng, Xu, YaLei, Zhao, and QiShe, Yan
- Subjects
Light ,Photoelectron Spectroscopy ,Iodine Compounds ,Sulfadiazine ,Oxides ,Iodides ,Catalysis ,Oxygen ,X-Ray Diffraction ,Microscopy, Electron, Scanning ,Solar Energy ,Spectrophotometry, Ultraviolet ,Adsorption ,Crystallization ,Bismuth - Abstract
Bi₇O₉I₃, a kind of visible-light-responsive photocatalyst, with hierarchical micro/nano-architecture was successfully synthesized by oil-bath heating method, with ethylene glycol as solvent, and applied to degrade sulfonamide antibiotics. The as-prepared product was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflection spectra and scanning electron microscopy (SEM). XRD and XPS tests confirmed that the product was indeed Bi₇O₉I₃. The result of SEM observation shows that the as-synthesized Bi₇O₉I₃ consists of a large number of micro-sheets with parallel rectangle structure. The optical test exhibited strong photoabsorption in visible light irradiation, with 617 nm of absorption edges. Moreover, the difference in the photocatalytic efficiency of as-prepared Bi₇O₉I₃ at different seasons of a whole year was investigated in this study. The chemical oxygen demand removal efficiency and concentration of NO(3)(-) and SO(4)(2-) of solution after reaction were also researched to confirm whether degradation of the pollutant was complete; the results indicated a high mineralization capacity of Bi₇O₉I₃. The as-synthesized Bi₇O₉I₃exhibits an excellent oxidizing capacity of sulfadiazine sodium and favorable stability during the photocatalytic reaction.
- Published
- 2015
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