BiOCl/MIL-100(Fe)复合催化剂光-芬顿降解有机染料RhB及其降解机理  

BiOCl/MIL-100(Fe)Composite Catalyst for Photo-Fenton Degradation of RhB and the Degradation Mechanism

作　　者：周志英 张彪 陈涛 黄元旦 倪华钢[2] ZHOU Zhi-ying;ZHANG Biao;CHEN Tao;HUANG Yuan-dan;NI Hua-gang(Zhejiang Sinopont Technology Co.,Ltd.,Hangzhou,Zhejiang 311254,China;Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Education Ministry,Zhejiang Sci-Tech University,Hangzhou,Zhejiang 310018,China)

机构地区：[1]浙江祥邦科技股份有限公司,浙江杭州311254 [2]浙江理工大学先进纺织材料与制备技术教育部重点实验室,浙江杭州310018

出　　处：《浙江化工》2021年第12期36-47,共12页Zhejiang Chemical Industry

摘　　要：优异的异质结结构是提高光催化活性的核心,本文以FeCl_(2)、BiCl_(3)、H_(3)BTC为原料,以水为溶剂,采用一步共沉淀法制备了具有高效催化活性的BiOCl/MIL-100(Fe)可见光复合催化剂,对其进行相应的表征,并研究了其在光+芬顿条件下催化降解罗丹明B(RhB)的性能。相比于纯MIL-100(Fe)和BiOCl,杂化材料BiOCl/MIL-100(Fe)(MBF-50)具有最好的光-芬顿催化活性。当温度为30℃,RhB浓度为40 mg/L,催化剂浓度为80 mg/L,H_(2)O_(2)浓度为7.4 mmol/L时,20 min内RhB的去除率可达98%,光-芬顿降解速率分别为芬顿催化速率的7倍和光催化速率的14倍。BiOCl与MIL-100(Fe)异质结界面的形成有效降低了光电子空穴的复合效率,增加了RhB与活性物种发生氧化还原反应的机会。更多的Fe^(2+)/Fe^(3+)混合价铁不饱和位点的生成,增强了路易斯酸性,提高了光-芬顿激活H_(2)O_(2)对污染物降解的催化效率。An excellent heterojunction structure is the core to improve photocatalytic activity.In this paper,BiOCl/MIL-100(Fe)visible light composite catalyst with high catalytic activity was prepared via onepot coprecipitation method using FeCl_(2),BiCl_(3),H_(3)BTC as raw materials and water as solvent,and its corresponding characteristics were studied.The catalytic degradation of rhodamine B(RhB)under fenton+photocatalytic conditions was studied.Compared with pure MIL-100(Fe)and BiOCl,the hybrid material BiOCl/MIL-100(Fe)(MBF-50)has the best photo-Fenton catalytic activity.When the temperature is 30℃,the concentration of RHB is 40 mg/L,the concentration of catalyst is 80 mg/L and the concentration of H_(2)O_(2) is 7.4 mmol/L,the removal rate of RhB can reach 98%within 20 minutes,and the photo-Fenton degradation rate is 7 times of the Fenton catalytic rate and 14 times of photocatalytic rate.The formation of BiOCl and Mil-100(Fe)heterojunction effectively reduces the recombination efficiency of photoelectron holes and increases the chance of redox reaction between RhB and active species.The formation of more Fe^(2+)/Fe^(3+) mixed iron unsaturated sites enhances Lewis acidity and improves the catalytic efficiency of photo-Fentonactivated H_(2)O_(2) for pollutant degradation.

关 键 词：一步共沉积 光-芬顿 不饱和配位点 异质结 BiOCl/MIL-100(Fe) 

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