S-BiOI/BiOBr吸附型光催化剂的制备及其对2,4−二氯苯氧乙酸的去除性能  

Preparation of S-BiOI/BiOBr adsorption photocatalyst and its removal properties for 2,4-dichlorophenoxyacetic acid

作　　者：姚丹 阳艺 郑安妮 王绍兵 余关龙[2,3] YAO Dan;YANG Yi;ZHENG Anni;WANG Shaobing;YU Guanlong(Water Resources Center of Hunan Province,Changsha 410007,China;School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province,Changsha 410114,China)

机构地区：[1]湖南省水资源中心,长沙410007 [2]长沙理工大学水利与环境工程学院,长沙410114 [3]洞庭湖水环境治理与生态修复湖南重点实验室,长沙410114

出　　处：《复合材料学报》2024年第11期6065-6076,共12页Acta Materiae Compositae Sinica

基　　金：湖南省水利科技项目(XSKJ2022068-03,XSKJ2023059-37);湖南省生态环境厅科研项目(HBKT-2021012)。

摘　　要：水体的农药污染对人体健康构成潜在威胁。采用一步溶剂热法合成了一种新型S_(0.1)-(0.3/0.7)BiOI/BiOBr(S_(0.1)BBI_(0.3))光催化剂。通过XRD、SEM、XPS、UV-Vis DRS、EIS等手段表征其结构、形貌和光学性能等理化性质。S_(0.1)BBI_(0.3)呈二维纳米片堆积而成的花状微球结构,Z型异质结和S掺杂双策略共修饰拓宽了BiOBr的光响应范围,有效防止光生电子-空穴对在S_(0.1)BBI_(0.3)内部复合,提高光生载流子的氧化还原能力,同时能够提高比表面积,提供更丰富的介孔结构,显著提升吸附性能,并为光催化反应提供了更多的活性位点。光催化实验结果表明,合成的S_(0.1)BBI_(0.3)在可见光下对2,4−二氯苯氧乙酸(2,4-D)具有最佳的吸附和光催化性能,在45 min黑暗和120 min光照条件下,2,4-D去除率最高可达91.8%。电子自旋共振技术(ESR)证实·O_(2)^(-)是S_(0.1)BBI_(0.3)的光催化活性物质。Pesticide pollution of water body is a potential threat to human health.In this study,a new S_(0.1)-(0.3/0.7)BiOI/BiOBr(S_(0.1)BBI_(0.3))photocatalyst was synthesized by one-step solvothermal method.The structure,morphology and optical properties were characterized by XRD,SEM,XPS,UV-Vis DRS,EIS and other methods.S_(0.1)BBI_(0.3)is a flower-like microsphere structure formed by the accumulation of two-dimensional nanosheets.Z-type heterojunction and S-doped dual-strategy co-modification broaden the photoresponse range of BiOBr,effectively prevent the photogenerated electron-hole pair recombination in S_(0.1)BBI_(0.3),improve the photogenerated carrier redox ability,and increase the specific surface area.It provides more mesoporous structures,significantly improves adsorption properties,and provides more active sites for photocatalytic reactions.The photocatalytic experiment results showed that S_(0.1)BBI_(0.3)had the best adsorption and photocatalytic performance for 2,4-dichlorophenoxyacetic acid(2,4-D)under visible light,and the removal rate of 2,4-D was up to 91.8%under 45 min darkness and 120 min light conditions.Electron spin resonance(ESR)technology confirmed that·O_(2)^(-)is a photocatalytic active substance of S0.1BBI0.3.

关 键 词：BiOBr S掺杂 异质结 2 4-二氯苯氧乙酸 农药 光催化 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] TB332[一般工业技术—材料科学与工程]