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167 results on '"Zhai, Hongju"'

26. Vacancy-Enabled Mesoporous TiO2 Modulated by Nickel Doping with Enhanced Photocatalytic Nitrogen Fixation Performance

Author

Dandan Wang, Zhao Zhao, Zhai Hongju, Li Jiaxin, Zaicheng Sun, Guan Renquan, and Yujun Zhang

Subjects
Materials science, Renewable Energy, Sustainability and the Environment, General Chemical Engineering, Doping, chemistry.chemical_element, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Photogenerated electron, 0104 chemical sciences, Nickel, chemistry.chemical_compound, Adsorption, Chemical engineering, chemistry, Vacancy defect, Titanium dioxide, Photocatalysis, Environmental Chemistry, 0210 nano-technology, Mesoporous material
Abstract

Photocatalysis provides a sustainable route to convert N2 to NH3 with the aid of a photogenerated electron. Beyond the typical issue in the photocatalytic field, NH3 synthesis requires adsorption, ...

Published
2020

34. Effects of Ag Doping Content and Dispersion on the Photocatalytic and Antibacterial Properties in ZnO Nanoparticles

Author

LI Jiaxin, Guan Renquan, Zhang Junkai, Wang Yan, Zhai Hongju, and Sun De-wu

Subjects
Materials science, Photoluminescence, Nanocomposite, Dopant, Doping, technology, industry, and agriculture, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, X-ray photoelectron spectroscopy, Scanning transmission electron microscopy, Photocatalysis, 0210 nano-technology, Dispersion (chemistry), Nuclear chemistry
Abstract

ZnO nanoparticles(NPs) with different contents of Ag dopants were obtained by one-step solvothermal method. The crystalline structures of the prepared composites were characterized by means of X-ray diffraction (XRD). The morphology and composition of the samples were studied by means of scanning transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS) and electron microscopy(SEM). Photoluminescence(PL) spectra have been used to investigate pure ZnO, Ag-ZnO and Ag-ZnO-PVP NPs to determine the effect of composition on PL properties. It was found that the Ag-ZnO samples showed stronger emissions than pure ZnO. The catalytic activity of samples was measured by the degradation rate of R6G, which exhibited that Ag-ZnO nanocomposite demonstrated enhanced photocatalytic activity compared to the pure ZnO NPs. The possible influence factors to the photocatalytic and antibacterial activities of the sample were explored, including Ag contents and dispersion. It was presented that the photocatalytic activity of Ag-ZnO-PVP was better than that of Ag-ZnO and it showed the highest photocatalytic activity with 7% of Ag content. The Ag-ZnO-PVP can kill the Escherichia coli(E. coli) cells.

Published
2019

35. A Facile In Situ Hydrothermal Etching Method to CaTiO3/TiO2 Heterostructure for Efficient Photocatalytic N2 Reduction.

Author

Gao, Xinchun, Song, Muyao, Sun, Dewu, Guan, Renquan, Zhai, Hongju, Zhao, Zhao, Zhang, Qi, and Li, Xiaohui

Subjects
PHOTOREDUCTION, SOLAR energy conversion, ETCHING, NITROGEN fixation, VISIBLE spectra, CALCIUM hydroxide
Abstract

Photocatalytic nitrogen fixation for the synthesis of ammonia is an important and attractive method to N2 turning into other compounds. The development of compact heterostructure photocatalysts is crucial for efficient solar energy conversion. Here, composite was obtained by simple in situ hydrothermal etching of the reduced TiO2 nanospheres with saturated calcium hydroxide solution. CaTiO3/TiO2 heterostructure composite can adsorb, activate and convert N2 to ammonia by using its close contact interface. Under simulated sunlight irradiation, CaTiO3/TiO2 composite greatly enhanced the photocatalytic N2 reduction performance. Compared with pure CaTiO3, the efficiency of 0.3-T–C heterostructure in synthesizing NH3 under visible light was 1.88 times higher than that of pure CaTiO3 (59.17 μmol·g−1·h−1) The excellent photocatalytic performance of CaTiO3/TiO2 is attributed to the close structure between CaTiO3 and TiO2, which promotes the separation of photogenerated charges and provides more active sites. This study provides a basic idea for the rational design of highly efficient heterogeneous photocatalysts to achieve excellent photocatalytic performance for N2 reduction. [ABSTRACT FROM AUTHOR]

Published
2022
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39. Efficient Catalytic Fixation Nitrogen Activity Under Visible Light by Molybdenum Doped Mesoporous TiO2.

Author

Li, Xiaohui, Li, Jiaxin, Zhai, Hongju, Song, Muyao, Wang, Lijing, Guan, Renquan, Zhang, Qi, and Zhao, Zhao

Subjects
VISIBLE spectra, NITROGEN fixation, ION recombination, MOLYBDENUM, MOLYBDENUM ions, SURFACE defects, PHOTOCATALYSTS
Abstract

An efficient photocatalyst capable of forming oxygen defects on the surface of mesoporous TiO2 was obtained via doping molybdenum ions which can obviously broaden the absorption range of TiO2 under visible light and reduce the recombination rate of photogenerated electron–hole pairs. The surface oxygen defects (Vo) introduced by metal molybdenum doping will adsorb and activate target molecules on the semiconductor surface. The effect of Vo content, modulated by Mo ions doping, on the photocatalytic NH3 production rates of the as-obtained samples was investigated. The optimal photocatalytic NH3 generation rate of Mo-doped TiO2 could reach 183.02 μmol·g−1·h−1 under visible light. PL and photoelectrochemical tests results demonstrated that Mo dopants could promote photogenerated carrier's separation and restrain the recombination of carriers. Furthermore, the photocatalysts also exhibited good stability in the recycling experiments for 5 runs. The enhanced photocatalytic activity is owing to the Vo defect states, created by the Mo ion-doped, which benefits to the N2 adsorption and reduction at the Ti4+ activation center during the nitrogen fixation process. [ABSTRACT FROM AUTHOR]

Published
2022
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