高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

Z型g-C3N5/BiOBr异质结的制备及其光催化还原Cr(VI)性能研究

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
  • 收稿日期:2026-06-06 修回日期:2026-07-24 网络首发:2026-08-06 发布日期:2026-08-06
  • 通讯作者: 魏婷婷 E-mail:weitt321@xztu.edu.cn
  • 基金资助:
    山西省科技厅青年项目（批准号：202203021212177）和忻州市科技计划项目（批准号：20230703）资助

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
  • Received:2026-06-06 Revised:2026-07-24 Online First:2026-08-06 Published:2026-08-06
  • Contact: Ting-Ting WEI E-mail:weitt321@xztu.edu.cn
  • Supported by:
    Supported by the Youth Science Research Project of Shanxi Province, China(No.202203021212177) and the Technology Plan Project of Xinzhou City, China(No.20230703)

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摘要： 以溴氧化铋(BiOBr)和富氮氮化碳(g-C3N5)为原料，通过溶剂热法构建了Z型g-C3N5/BiOBr异质结光催化剂。通过XRD、SEM、BET、UV-Vis DRS及I-t等手段对材料的晶相结构、形貌、比表面积、光学吸收及光电化学性能进行了表征。通过模拟太阳光催化还原Cr(VI)，光照45 min后，纯BiOBr对Cr(VI)的还原效率为65.85%；5% g-C3N5/BiOBr异质结还原效率为98.58%，调节溶液酸碱性，在pH=4的弱酸性条件下还原效率最佳，达99.6%。5% g-C3N5/BiOBr异质结在五次循环重复后还原率仍高于97%，且在自来水和自然太阳光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，有效抑制了载流子复合，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: Using bismuth oxybromide(BiOBr) and nitrogen-rich carbon nitride(g-C3N5) as raw materials, a Z-scheme g-C3N5/BiOBr heterojunction photocatalyst was constructed via solvothermal method. The crystal phase structure, morphology, specific surface area, optical absorption and photoelectrochemical properties of the materials were characterized by XRD, SEM, BET, 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 for Cr(VI) was 65.85%; the reduction efficiency of 5% g-C3N5/BiOBr heterojunction was 98.58%. 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 remained higher than 97% after five cycles, and it maintained good catalytic activity and stability in tap water and 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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