摘要
为强化多相类芬顿反应的速率,以氟为配体的三价铁氟化合物(FeⅢF/R)为催化剂,进行催化过氧化氢降解孔雀石绿实验.同时,探讨了初始pH值、温度、过氧化氢初始浓度和孔雀石绿初始浓度等对反应速率的影响.结果表明,与FeⅢ/R相比,催化剂FeⅢF/R具有更强的催化活性,能强化羟基自由基(OH.)的产生.反应的最佳pH值为6.0;反应速率常数与过氧化氢和孔雀石绿(MG)的初始浓度呈正相关;温度越高,反应速率越快,反应遵循假一级反应动力学,反应活化能为89.30kJ.mol-1.催化剂重复使用表明,铁在树脂表面负载比较牢固,具有较好的稳定性和耐用性.
In order to increase the reaction rate of the heterogeneous Fenton-like oxidation,the catalyst of Fe^ⅢF/R was used to catalytically decompose H2O2 for the removal of Malachite Green (MG) in aqueous solution. The results show that the catalyst of Fe^ⅢF/R has a better catalytic reactivity to enhance the formation of OH compared with that of Fe^Ⅲ/R. In the meantime,the effect of initial pH,temperature,initial H2O2 concentration and initial MG concentration on the reaction rate is also discussed. The results show that the optimal pH is 6.0 ; the reaction rate constant is proportional to the initial concentrations of MG and H2O2 ; the higher the temperature, the faster the reaction rate is, this reaction follows pseudo-first-order kinetics. The activation energy for Fe^Ⅲ F/R catalyzed oxidation of MG was determined to be 89.30 kJ·mol^-1. Repeated uses of catalyst did not decrease the removal rate of MG.
出处
《环境科学学报》
CAS
CSCD
北大核心
2009年第10期2063-2069,共7页
Acta Scientiae Circumstantiae
基金
国家高技术研究发展计划(863)项目(No.2006AA06Z306)~~