一步溶剂热法制备BiOCl/BiOBr异质结及其光催化性能研究  

One-Step Solvothermal Synthesis and PhotocatalyticPerformance of BiOCl/BiOBr Heterojunction

作　　者：李红[1] 金传玉 张大凤[1] LI Hong;JIN Chuanyu;ZHANG Dafeng(School of Materials Science and Engineering,Liaocheng University,Liaocheng 252059,China)

机构地区：[1]聊城大学材料科学与工程学院,山东聊城252059

出　　处：《聊城大学学报(自然科学版)》2025年第2期259-267,共9页Journal of Liaocheng University:Natural Science Edition

基　　金：国家自然科学基金项目(51904148)资助。

摘　　要：光催化技术能够利用太阳能降解有机污染物,近年来受到了广泛关注。开发优良的光催化剂对于高效降解有机污染物具有重要的研究价值和实际意义。以五水合硝酸铋、溴化钾、氯化钠为主要反应物,采用一步溶剂热法制备了BiOCl/BiOBr异质结,通过扫描电子显微术、X射线衍射、X射线光电子能谱、紫外可见漫反射等测试手段对样品的形貌、物相组成、表面化学态、光催化性能进行了表征,研究了BiOCl和BiOBr物质的量比对材料光催化性能的影响。结果表明当BiOCl和BiOBr的物质的量比为2∶8时,BiOCl/BiOBr的可见光催化降解罗丹明B(RhB)的效果最佳,光照35 min后降解率为96.3%。自由基捕获实验发现·O_(2)^(-)和h^(+)在降解RhB中占主导地位,提出了S型光催化机理。Photocatalytic technology has attracted widespread attention in recent years due to its eco-friendly nature of utilizing solar energy to degrade organic pollutants.The development of excellent photocatalysts has important research value and practical significance for the efficient degradation of organic pollutants.BiOCl/BiOBr heterojunction photocatalytic materials were prepared by one-step solvothermal method with bismuth nitrate pentahydrate,sodium chloride and potassium bromide as the main reagents and ethylene glycol as the solvent.The morphology,phase composition,surface chemical states and photocatalytic properties of the samples were characterized by scanning electron microscopy,X-ray diffraction,X-ray photoelectron spectroscopy,and UV-vis diffuse reflection.The study investigated the impact of the molar ratio of BiOCl to BiOBr on the photocatalytic performance of the material.The results showed that when the molar ratio of BiOCl and BiOBr was 2∶8,the visible light catalytic degradation of Rhodamine B(RhB)by BiOCl/BiOBr heterojunction photocatalytic material was the best,reaching 96.3%after 35 min light irradiation.The free radical trapping experiment found that·O_(2)^(-) and h^(+)played dominant roles in the degradation of RhB,and the S-scheme photocatalytic mechanism was proposed.

关 键 词：溶剂热法 BiOCl/BiOBr 异质结 光催化性能 罗丹明B 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]