均相与非均相超声-芬顿催化降解水中罗丹明B

以染料罗丹明B(RhB)为目标污染物,以泡沫铁为非均相催化剂,比较均相与非均相超声芬顿体系对RhB的去除效果,并考察了RhB初始含量、溶液初始pH、H2O2投加量等因素的影响。通过对不同体系反应速率、Fe^2+含量变化以及H2O2产量的比较分析,探索比较了降解机制。结果表明,均相超声芬顿体系对RhB的去除率高于非均相超声芬顿体系,当初始RhB的质量浓度为5 mg/L,初始pH为3,H2O2投加量为0.5 mmol/L时,RhB去除率分别达到99.86%、94.43%;前40 s符合一级反应动力学方程,基于泡沫铁的非均相芬顿体系可在超声辐射下产生更多Fe^2+和H2O2,从而有利于对目标污染物的持续降解。

Homogeneous and Heterogeneous Ultrasound-Fenton for Degradation of RhB in Water

The comparative study of Rhodamine B(RhB)removal effect under ultrasound-fenton system with homogeneous(FeSO4/H2O2)and heterogeneous(Iron Foam/H2O2)has been investigated.The effects of the RhB initial concentration,initial pH,H2O2 dosage were studied.Based on the comparison of the reaction rate,the concentration change of ferrous ions,the H2O2 evolution among the different system,the preliminary degradation mechanism of the system was also explored.The results showed that,the RhB removal rate by homogeneous ultrasound-fenton system was higher than heterogeneous ultrasound-fenton system,when RhB initial concentration,initial pH and H2O2 dosage was 5 mg/L,3 and 0.5 mmol/L respectively,the Rh B removal rate of homogeneous and heterogeneous system was 99.86%and 94.43%respectively.The first 40 s reaction followed the first-order reaction kinetics equation.The heterogeneous system based on iron foam with ultrasound could produce more Fe^2+and H2O2,which was beneficial for the continuous degradation of target pollutant.