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

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.