碳酸氢钠溶液中微量Mn^(2+)离子催化氧化降解有机污染物  

Oxidative Degradation of Organic Pollutants Catalyzed by Trace Manganese(Ⅱ) Ion in Sodium Bicarbonate Solution

作　　者：徐爱华[1] 邵科杰[1] 吴文利[1] 范兢 崔金久 尹国川[1] 

机构地区：[1]华中科技大学化学与化工学院,湖北武汉430074 [2]宁波市环境保护科学研究设计院,浙江宁波315012

出　　处：《催化学报》2010年第8期1031-1036,共6页

基　　金：中国博士后科学基金(20080440938);宁波市科研院所专项资金项目(2009A80001)

摘　　要：考察了微量Mn2+离子在NaHCO3溶液中催化H2O2氧化降解有机污染物的性能.结果表明,NaHCO3,MnCl2和H2O2浓度分别为25,0.1和100mmol/L时,在25oC下反应180min后亚甲基蓝可完全脱色,化学耗氧量和总有机碳去除率分别达到44.0%和13.8%.该催化体系对甲基橙、罗丹明B以及垃圾渗滤液等都有较好去除效果.紫外-可见光谱分析及反应动力学测试表明,MnIV=O是该催化体系主要活性物种.Catalytic degradation of organic pollutants in a sodium bicarbonate solution with Mn2＋ ion （0.004-0.1 mmol/L） as the catalyst has been studied using H2O2 as the oxidant.Complete decoloration of methylene blue was achieved in 180 min with 44.0% chemical oxidation demand removal at 25 oC at the NaHCO3,MnCl2 and H2O2 concentrations of 25,0.1,and 100 mmol/L,respectively.The total organic carbon measurement indicated that 13.8% of the carbon was mineralized.The Mn2＋/HCO3-＋ H2O2 system also showed high ability for oxidative degradation of methyl orange,rhodamine B,and even landfill leachate.The analysis of UV-Vis spectroscopy and reaction kinetics indicated that the MnIV=O intermediate is the key active species in methylene blue degradation.

关 键 词：碳酸氢钠 过氧化氢 二价锰离子 降解 染料 垃圾渗滤液 

分 类 号：O643.32[理学—物理化学]