通过构建Mn2+/Fe2+和SO2-3/Fe2+两种均相光催化体系,并以罗丹明B(RhB)为模拟污染物评价它们的光催化性能。结果表明,SO2-3的存在会抑制催化体系的催化氧化活性,SO2-3/Fe2+体系的速率常数(0.0203min-1)仅为UV/Fe2+体系(0.0681min-1)的29.81%;而Mn2+/Fe2+体系表现出优异的氧化活性,且当溶液pH=4.0,Fe2+和Mn2+浓度分别为0.5mmol/L和0.03mmol/L时,RhB降解率达到100%,速率常数为0.1207min-1。此外,清除剂实验表明,Mn2+/Fe2+体系活性物质主要为·OH。
Photocatalytic systems of Mn2+/Fe2+ and SO2-3/Fe2+ were constructed,and their photocatalytic performance was evaluated via the degradation of RhB.Results shown that the presence of SO2-3 inhibited the oxidation activity of the catalytic system,and the rate constant (0.0203min-1) was only 29.81% of the UV/Fe2+ system (0.0681min-1).However,Mn2+/Fe2+ system exhibited excellent oxidation activity,and the removal percent of RhB reached 100% with rate constant of 0.1207min-1 at pH 4.0 when the concentration of Fe2+and Mn2+ was 0.5mmol/L and 0.03mmol/L,respectively.In addition,the scavenger experiments shown that the main active species of Mn2+/Fe2+ system was ·OH.
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