超声-Fe^2+-K2S2O8/NaHSO3体系降解罗丹明B  

Degradation of rhodamine B using ultrasound-Fe^2+-K2S2O8/NaHSO3 system

作　　者：张义焕 杨宇帆 沈佳如 聂恒 张雷 刘建才 占昌朝[1,2] ZHANG Yihuan;YANG Yufan;SHEN Jiaru;NIE Heng;ZHANG Lei;LIU Jiancai;ZHAN Changchao(College of Chemical and Environmental Engineering,Jiujiang University,Jiujiang 332005,China;Jiangxi Engineering Research Center of Ecological Chemical Engineering Technology,Jiujiang 332005,China)

机构地区：[1]九江学院化学与环境工程学院,江西九江332005 [2]江西省生态化工工程技术研究中心,江西九江332005

出　　处：《化工环保》2020年第5期501-506,共6页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金项目(51562016);江西省自然科学基金项目(20171BAB206015);国家大学生创新创业计划项目(201811843001)。

摘　　要：采用超声促进、Fe2+活化的K2S2O8/NaHSO3联合体系(US-Fe2+-K2S2O8/NaHSO3体系)降解罗丹明B(RhB)。考察了RhB模拟废水脱色效果的影响因素,并研究了不同处理方法的协同效应,推测了反应机理。实验结果表明:在反应温度25℃、初始pH 5.18、超声功率250 W、K2S2O8溶液(4.91 mmol/L)加入量1.2 mL、NaHSO3溶液(4.91 mmol/L)加入量1.2 mL、n(K2S2O8)∶n(Fe2+)=10、反应时间7 min的条件下,RhB模拟废水(50 mL)的脱色率达到89.45%;超声与Fe2+-K2S2O8/NaHSO3体系对RhB的降解产生了协同效应,降解反应符合表观一级反应动力学,速率常数增强因子可达13.6。自由基猝灭实验结果表明,硫酸根自由基和羟基自由基是攻击RhB分子的活性自由基,硫酸根自由基起主要作用。Rhodamine B(RhB)was degraded by the ultrasound promoted and ferrous ion activated K2S2O8/NaHSO3 combination system(US-Fe2+-K2S2O8/NaHSO3 system).The factors affecting decolorization of the simulated RhB wastewater were studied.The synergistic effect of different treatment methods was investigated and the reaction mechanism was speculated.The experimental results show that:Under the conditions of reaction temperature 25℃,initial pH 5.18,ultrasonic power 250 W,K2S2O8 solution(4.91 mmol/L)volume 1.2 mL,NaHSO3 solution(4.91 mmol/L)volume 1.2 mL,n(K2S2O8)∶n(Fe2+)=10 and reaction time 7 min,the decolorization rate of the simulated RhB wastewater reaches 89.45%;The US-Fe2+-K2S2O8/NaHSO3 system has synergistic effect on RhB degradation,which is in conformity with the pseudo-first order kinetics and the kinetics enhancement factor of which can reach13.6.The results of free radical quenching experiments show that sulfate radicals and hydroxyl radicals are active radicals that attack RhB molecules,and sulfate radicals play a major role.

关 键 词：超声 过硫酸钾 亚铁离子 罗丹明B 协同效应 硫酸根自由基 

分 类 号：X786[环境科学与工程—环境工程]