Preparation of g-C3N4/Ag/BiOBr Composite and Photocatalytic Reduction of Nitrate

被引：0
|
作者：
Liu Z. [1 ,3 ,4 ]
Yue Y. [2 ]
Qiu Y. [2 ]
Bu X. [1 ,3 ,4 ]
Yang T. [1 ,3 ,4 ]
机构：
[1] School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha
[2] School of Chemistry and Chemical Engineering, Changsha University of Science & Technology, Changsha
[3] Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha
[4] Engineering and Technical Center of Hunan Provincial Environmental Protection for River-Lake Dredging Pollution Control, Changsha
来源：
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2023年 / 37卷 / 10期
关键词：
composite; g-C[!sub]3[!/sub]N[!sub]4[!/sub]/Ag/BiOBr; inorganic non-metallic materials; nitrate nitrogen; nitrogen selectivity; photocatalysis;
D O I：
10.11901/1005.3093.2022.627
中图分类号：
学科分类号：
摘要：
Nitrate as one of the water pollutants is one of the major environmental problems. Photocatalytic reduction of nitrate nitrogen has attracted a lot of attention because of its high efficiency and environmental friendliness. The g-C3N4/Ag/BiOBr composite photocatalyst was prepared by high temperature calcination, reaction synthesis and photoreduction. The photocatalysts were characterized by SEM, XRD, EPMA、FT-IR, XPS and UV-vis, and the reduction effect of the composite on nitrate nitrogen (50 mg/ L) under the irradiation of metal halide lamp was studied. The results showed that when 1g/L g-C3N4/Ag/ BiOBr catalyst was used, the nitrate concentration was 2.4 mg/L, and the removal rate was 95.2% after 180 min photoreaction. Compared with g-C3N4, BiOBr and g-C3N4/BiOBr photocatalysts, the removal rates increased by 38.8%, 34.6% and 13.1%, respectively. Nitrogen was the main product in the photocatalytic conversion of nitrate nitrogen. The proportion of N2 in the main products of nitrate nitrogen photocatalyzed by g-C3N4/Ag/BiOBr was the highest (88.0%), and the selectivity of nitrogen was 92.4%. Ag can be used as an electron trapping agent to effectively reduce the recombination of electron-hole pairs in photocatalytic materials. Under the action of silver, the photogenerated electrons of BiOBr are transferred to the valence band of g-C3N4 by silver elemental material, forming a Z-type composite photocatalytic structure. Nitrate nitrogen can be directly oxidized by the composite photocatalyst, and the hole scavenger formic acid can be converted into a strong oxidizing substance (COO.-) under the action of the composite hole, which can further reduce nitrate nitrogen. © 2023 Chinese Journal of Materials Research. All rights reserved.
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页码：781 / 790
页数：9
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