高等学校化学学报 ›› 2026, Vol. 47 ›› Issue (11): 20260231.doi: 10.7503/cjcu20260231

• 物理化学 • 上一篇    下一篇

Z型g-C3N5/BiOBr异质结的制备及光催化还原Cr(VI)性能

金占斌, 倪松翔, 任子涵, 谷建霞, 乔洪涛, 魏婷婷()   

  1. 忻州师范学院化学系, 忻州 034000
  • 收稿日期:2026-06-06 出版日期:2026-11-10 发布日期:2026-08-06
  • 通讯作者: 魏婷婷 E-mail:20211035@nenu.edu.cn
  • 基金资助:
    山西省科技厅青年项目(202203021212177);忻州市科技计划项目(20230703)

Preparation of Z-scheme g-C3N5/BiOBr Heterojunction and Its Photocatalytic Performance for Cr(VI) Reduction

JIN Zhanbin, NI Songxiang, REN Zihan, GU Jianxia, QIAO Hongtao, WEI Tingting()   

  1. Department of Chemistry,Xinzhou Normal University,Xinzhou 034000,China
  • Received:2026-06-06 Online:2026-11-10 Published:2026-08-06
  • Contact: WEI Tingting E-mail:20211035@nenu.edu.cn
  • Supported by:
    the Youth Science Research Project of Shanxi Province, China(202203021212177);the Technology Plan Project of Xinzhou City, China(20230703)

摘要:

随着现代工业化进程的加速推进, 环境污染问题日益突出, 急需开发高效的污染物无害化降解技术. 本文采用溶剂热法制备了Z型g-C3N5/BiOBr异质结光催化剂. 通过X射线衍射(XRD)、 扫描电子显微镜(SEM)、 氮气吸附-脱附分析、 紫外-可见漫反射光谱(UV-Vis DRS)及电流-时间曲线(I-t)等表征了材料的晶相结构、 形貌、 比表面积、 光学吸收及光电化学性能. 通过模拟太阳光催化还原Cr(VI)发现, 光照45 min后纯BiOBr对Cr(VI)的还原效率为65.85%; 5%g-C3N5/BiOBr异质结的还原效率为98.58%. 调节溶液酸碱性发现, 在pH=4的弱酸性条件下还原效率最佳(达99.60%). 5%g-C3N5/BiOBr异质结在5次循环使用后对Cr(VI)的还原率仍高于97%, 且在自来水中和太阳光照射下均保持良好的催化活性和稳定性. 自由基捕获实验证实光生电子(e-)为主要活性物种. 该异质结拓宽了光吸收范围, 有效抑制载流子复合, 显著提升了光催化还原Cr(VI)性能.

关键词: g-C3N5/BiOBr, Z型异质结, 光催化还原, Cr(VI)

Abstract:

With the accelerated advancement of modern industrialization, environmental pollution problems have become increasingly prominent, making the development of efficient and environmentally benign pollutant degradation technologies of great practical value. In this work, a Z-scheme g-C3N5/BiOBr heterojunction photocatalyst was successfully fabricated via a facile solvothermal method. The crystal phase structure, morphology, specific surface area, optical absorption and photoelectrochemical properties of the materials were characterized by XRD, SEM, N2 adsorption-desorption analysis, UV-Vis DRS and I-t measurements. Through catalytic reduction of Cr(VI) under simulated sunlight, after 45 min of illumination, the reduction efficiency of pure BiOBr and 5%g-C3N5/BiOBr heterojunction for Cr(VI) was 65.85% and 98.58%, respectivety. By adjusting the acidity and alkalinity of the solution, the reduction efficiency was optimal under weakly acidic conditions of pH=4, reaching 99.6%. The reduction rate of 5%g-C3N5/BiOBr heterojunction for Cr(VI) remained higher than 97% after five cycles, and it maintained good catalytic activity and stability in tap water and under natural sunlight. Free radical capture experiments confirmed that photogenerated electrons(e⁻) were the main active species. The heterojunction broadens the light absorption range, effectively inhibits carrier recombination, and significantly improves the photocatalytic reduction performance of Cr(VI).

Key words: g-C3N5/BiOBr, Z-scheme heterojunction, Photocatalytic reduction, Cr(VI)

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