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Your search keyword '"Dai, Hongling"' showing total 122 results
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122 results on '"Dai, Hongling"'

39. Construction of a Z-scheme g-C3N4/NBGO/BiVO4heterostructure with visible-light driven photocatalytic degradation of tetracycline: efficiency, reaction pathway and mechanismElectronic supplementary information (ESI) available. See DOI: 10.1039/d1cy01850g

Author

Peng, Xiaoming, Liu, Caihua, Zhao, Zilong, Hu, Fengping, and Dai, Hongling

Abstract

In this study, an aminated graphene-like biochar (NGBO) was used as a solid-state electron mediator at a g-C3N4/BiVO4interface to construct a hybrid Z-scheme system (g-C3N4/NBGO/BiVO4) for the photocatalytic degradation of tetracycline (TC) from aqueous solutions. The construction of the Z-scheme heterojunction led to the consumption of a photogenerated hole (h+). This promotes charge carrier transfer (e−) of g-C3N4, which ensures that the g-C3N4is exposed with active sites, and shows a high efficiency for TC degradation. Among the composites of various ratios, the prepared g-C3N4/NBGO/BiVO4-0.5 presented the best degradation of TC when compared to other heterojunctions prepared under the same conditions, and the photocatalytic degradation rate constants of TC were enhanced significantly, being approximately 10.85 times and 2.70 times greater than that of pure g-C3N4and g-C3N4/BiVO4, respectively. The response surface design methodology (RSM) was also used to optimize the parameters of the degradation of TC. The ESR measurement and radical quenching experiments indicated that the h+and O2−were mainly responsible for the TC degradation. The plausible mechanisms of the photoinduced electron transfer pathways and photocatalytic reaction degradation pathway of TC were investigated by experimental analysis. It is expected that the formation of graphene-like biochar-based Z-scheme heterojunctions would be promising candidate photocatalysts for environmental applications.

Published
2022
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40. Experimental Study on the Removal of Algae and Odor with the Combined Process of Potassium Permanganate and Powdered Activated Carbon

Author

Hu Fengping, Hu Wenjie, Dai Hongling, and Xiao-Jun Peng

Subjects
Powdered activated carbon treatment, Potassium permanganate, chemistry.chemical_compound, Algae, biology, chemistry, Odor, Environmental chemistry, Scientific method, Inorganic chemistry, Coagulation (water treatment), biology.organism_classification
Published
2017
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41. Research on Water Treatment of Kongmu-Lake based on Micro Vortex Flocculation Technology with the combination of vortex reactor

Author

Hu Fengping, Zan Cao, Wang Yi, Dai Hongling, Bixia Huang, and Luo Wendong

Subjects
Flocculation, Materials science, Water flow, Hydraulic diameter, Water treatment, Mechanics, Raw water, Turbidity, Clarifier, Vortex
Abstract

Aiming to solve the problems of greater blindness and randomness in selecting design and operating parameters of micro vortex clarifier, this experiment used the Kongmu-Lake water as the research object to investigate the effects of flocculation time and coagulant dosage on flocs performance and flocculation efficiency under different working conditions, and the best parameter of vortex reactor dosage ratio and operational limits of the micro-vortex flocculation tank are optimized. The raw water flows through the type of HJTM-2 vortex reactor firstly, and the ratio of flocculation time that water flow through the type of HJTM-2 and HJTM-1 vortex reactor is 1:2. Under the best optimal working condition, the best coagulant dosage is 22mg/L and the flocculation time is 14.3min. At this time, the removal rate of turbidity, CODMn, UV254 reached 96.81%, 64.12%, 55.56%, respectively. The maximum floc equivalent diameter is 1.39mm, and the fractal dimension is 1.73.

Published
2019
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42. Preparation of Phosphorus and Oxygen Co-Doped With Graphite Carbon Nitride and Its Application in Photodegradation of Methylene Blue

Author

Dai Hongling, Hu Yuying, Hu Fengping, Luo Wendong, and Peng Xiaoming

Subjects
Materials science, X-ray photoelectron spectroscopy, chemistry, Chemical engineering, Phosphorus, Doping, Photocatalysis, chemistry.chemical_element, Nitride, Photodegradation, Oxygen, Catalysis
Abstract

In this study, phosphorus and oxygen co-doped graphite carbon nitride has been successfully prepared by simple thermal copolymerization. The as-prepared materials were characterized by SEM, XRD, XPS and UV-vis-DRS. The results showed that phosphorus and oxygen were successfully doped on the structure of graphite carbon nitride. Photocatalytic degradation of MB in solution by the catalyst has been studied, POCN-1 has the best photocatalytic activity among of the as prepared materials, photocatalytic degradation rate of MB is 10.6 times higher than that of g-C3N4. The main reason for its enhanced photocatalytic performance is that the co-doped of phosphorus and oxygen elements would change the electronic structure of g-C3N4, reduce the forbidden band width of the photocatalyst. At the same time, can extend the absorption boundary of visible light.

Published
2019
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45. Study on Coagulant Dosing Control System of Micro Vortex Water Treatment

Author

Hu Wenjie, Fan Qi, He Xizhen, Dai Hongling, and Hu Fengping

Subjects
Computer science, Control system, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Water treatment, 02 engineering and technology, Dosing, 021001 nanoscience & nanotechnology, 0210 nano-technology, Pulp and paper industry, Vortex
Published
2018
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47. Floc Performance parameters during water treatment in a micro-vortex flocculation process determined by machine vision.

Author

Dai, Hongling, Qiu, Zumin, Hu, Fengping, Gao, Chao, Chen, Y. Frank, and Zhou, Zheng

Subjects
FLOCCULATION, WATER purification, EFFLUENT quality, FLOCCULATION in water purification, HYSTERESIS
Abstract

The coagulant dosage of an existing water plant is mainly determined based on the experience of water treatment process and influent/effluent water quality indexes that have time hysteresis effects. To solve this problem, the effect of coagulant dosage on a number of parameters used to evaluate the efficiency of flocculation in a setup was determined by using the micro-vortex flocculation technology in conjunction with the investigation of the relation between the equivalent diameter and the fractal dimension. By means of the machine vision system and computerized analysis, the effects of floc quantity, floc equivalent diameter and fractal dimension can be assessed. The correlations of these parameters with turbidity and ζ potential of the settling water, taken as measures for effluent quality, were explored. The study results show that the optimal flocculation effect with a turbidity removal rate of 97.9% is achieved at the poly-aluminum chloride dosage of 20 mg/L. Meanwhile, a power exponential relation between the floc equivalent diameter and the fractal dimension was established with a correlation coefficient R2 of 0.826; relations among the effluent turbidity and the floc quantity, equivalent diameter, fractal dimension were established with a correlation coefficient R2 of 0.982, 0.851, and 0.875, respectively; equations between the ζ potential and the floc quantity, equivalent diameter, fractal dimension were also established where the correlation coefficient R2 were 0.868, 0.879, and 0.942, respectively. These results may provide excellent reference data for water plants to feed back the coagulant by floc performance parameters, which could relieve the hysteresis effect efficiently. [ABSTRACT FROM AUTHOR]

Published
2019
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50. Iron nanoparticles decorated TiO2hollow microspheres for boosting degradation of tetracycline in a photo-Fenton catalytic system

Author

Dai, Hongling, Liu, Zhaochen, Ou, Li, Shen, Yue, Ning, Zhihui, Hu, Fengping, and Peng, Xiaoming

Abstract

The problem of water pollution caused by antibiotic contamination is essential for human health and the ecological environment. In this study, Fe-doped TiO2(FT-2) photocatalyst with a hollow microsphere structure was fabricated for efficient photocatalytic-Fenton removal of tetracycline (TC) under visible light irradiation. The unique hollow microsphere structure of FT-2, iron doping and oxygen vacancies enhance the photo-Fenton activity and stability of the material. The results showed that the degradation rate of tetracycline in the FT-2 photo-Fenton system at 60 min was 98.18%, with a degradation efficiency of mostly 90% after five successful reuses. The efficient TC degradation activity should be mainly ascribed to the structure of hollow microspheres and oxygen vacancies, resulting in the extended optical light absorption in the visible light region, reduced compound efficiency of electron cavitation pairs, and accelerated separation and migration of photogenerated carriers. In addition, this highly benefits the formation of reactive radicals·O2-and h+play a key role in the TC degradation in a photo-Fenton reaction system and thus lead to great improvement in TC removal according to the capture experiments and EPR. This study provides an idea for the construction of semiconductor catalysts with oxygen vacancy and doped with transition metal elements for the effective photocatalytic remediation of wastewater containing antibiotic contaminants.

Published
2023
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