硅藻土负载固体超强酸多相类芬顿降解罗丹明B  

The Preparation of the Diatomite-Loaded Solid Superacid Catalyst and its Multiphase Fenton-Like Degradation of Rhodamine B

作　　者：吕洪滨[1] 郗丽娟[1] 孙乐阳 白瑞 Lv Hongbin;Xi Lijuan;Sun Leyang;Bai Rui(School of Chemical Engineering,Northeast Electric Power University,Jilin Jilin 132012)

机构地区：[1]东北电力大学化学工程学院

出　　处：《东北电力大学学报》2019年第4期49-53,共5页Journal of Northeast Electric Power University

基　　金：吉林省科技厅发展计划项目(20170309002GX)

摘　　要：采用浸渍沉淀法制备新型硅藻土基固体超强酸(硅藻土/Fe2O3-SO2-4)类Fenton催化剂,并将其应用于过氧化氢氧化降解有机物罗丹明B的反应中.探讨体系pH值、催化剂投加量、过氧化氢浓度、初始罗丹明B浓度、反应温度等因素对罗丹明B降解率的影响.结果表明:随着pH值升高,罗丹明B降解率下降,pH=3.0~8.7可有效降解罗丹明B,最佳pH值为3.0.催化H2O2降解罗丹明B的反应遵循一级反应动力学,反应活化能为42.34kJ/mol.反应速率常数与H2O2的初始浓度及与罗丹明B初始浓度都具有很好的正相关性.A novel diatomite-based solid superacid type Fenton catalyst (diatomite/Fe2O3-SO4^2-) has been prepared via an impregnation and precipitation method.The potential catalytic activity for the degradation of Rhodamine B by H2O2 also have been verified.The effects of the pH value,the dosage of the catalyst,the H2O2 concentration,the initial concentration of Rhodamine B,and the reaction temperature were all considered and carefully investigated in this work.The experimental results showed that the organic dye could be effectively degraded in the pH range of 3.0~8.7.The optimal pH value appears at 3.0 according to our experimental study.The study on reaction kinetics shows that degradation of Rhodamine B follows the first order reaction kinetics model in the presence of the diatomite-based solid superacid type Fenton catalyst,and the reaction activation energy was estimated to be 42.34 kJ/mol.Finally,the reaction rate constant is found to be in well proportion to the initial concentration of H 2 O 2 and Rhodamine B.

关 键 词：硅藻土 固体超强酸 多相类芬顿 罗丹明B 

分 类 号：X703[环境科学与工程—环境工程]