化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (11) : 209-213. DOI: 10.19817/j.cnki.issn 1006-3536.2020.11.046

科学研究

Mn²⁺/Fe²⁺和SO^2-₃/Fe²⁺均相体系光降解罗丹明B研究

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Study on the photodegradation of RhB by Mn²⁺/Fe²⁺ and SO^2-₃/Fe²⁺ homogeneous systems

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摘要

通过构建Mn²⁺/Fe²⁺和SO^2-₃/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,SO^2-₃的存在会抑制催化体系的催化氧化活性,SO^2-₃/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。

Abstract

Photocatalytic systems of Mn²⁺/Fe²⁺ and SO^2-₃/Fe²⁺ were constructed,and their photocatalytic performance was evaluated via the degradation of RhB.Results shown that the presence of SO^2-₃ 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.

关键词

Fe²⁺ / Mn²⁺ / SO^2-₃ / 光催化 / 罗丹明B

Key words

Fe²⁺ / Mn²⁺ / SO^2-₃ / photocatalysis / Rhodamine B

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Mn²⁺/Fe²⁺和SO^2-₃/Fe²⁺均相体系光降解罗丹明B研究[J]. 化工新型材料, 2020, 48(11): 209-213 DOI:10.19817/j.cnki.issn 1006-3536.2020.11.046

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