摘要
亚硫酸盐(S(Ⅳ))对有机废污水几乎没有净化作用,利用可溶性二价锰配合物(Mn(Ⅱ)-NTA(次氮基三乙酸盐))活化S(Ⅳ),并用于氧化降解近中性污染水中的有机污染物,探讨了pH、Mn(Ⅱ)和NTA的投加量和比例、S(Ⅳ)浓度和常见阴离子对Mn(Ⅱ)/NTA/S(Ⅳ)体系氧化降解目标有机污染物(罗丹明B(RhB))效能的影响。实验结果表明,在近中性条件下(pH=6~7.5),氧化降解2μmol/L RhB最适宜的Mn(Ⅱ)、NTA和S(Ⅳ)投加量分别为50、150、500μmol/L,此时RhB在15 min内的总降解率均>85%。紫外可见光谱实验证明中间价态锰(Mn(Ⅲ))的产生及其对S(Ⅳ)活化的关键作用;自由基淬灭实验和电子自旋共振实验证明SO_(4)^(·-)是Mn(Ⅱ)/NTA/S(Ⅳ)体系实现有机污染物快速降解的主要活性氧化物种。
Sulfite(S(IV))has little purification effect on organic wastewater.The soluble bivalent manganese complex(Mn(II)−NTA(nitrilotriacetic acid))was used to activate S(IV)for organic pollutants degradation in near-neutral polluted water.The effects of pH value,dosage and proportion of Mn(II)and NTA,S(IV)concentration and common anions on the oxidative degradation of target organic pollutant(Rhodamine B(RhB))in Mn(II)/NTA/S(IV)system were investigated.The results showed that the optimum Mn(II),NTA and S(IV)dosages for oxidative degradation of 2μmol/L RhB were 50μmol/L,150μmol/L and 500μmol/L under near-neutral conditions(pH=6~7.5),respectively.The total degradation efficiency of RhB was more than 85%within 15 min.The generation of intermediate manganese(Mn(III))and its key role in the activation of S(IV)were confirmed by UV-vis spectroscopy.The free radical quenching and electron spin resonance experiments showed that SO_(4)^(·-)was the main active oxidation species for the Mn(II)/NTA/S(IV)system to achieve rapid degradation of organic pollutants.
作者
钟正
丁魏
李琳
刘霜
刘朝
郑怀礼
ZHONG Zheng;DING Wei;LI Lin;LIU Shuang;LIU Chao;ZHENG Huaili(College of Environment and Ecology,Chongqing University,Chongqing 400045,China;CenerTech Tianjin Chemical Research and Design Institute Co.,Ltd,Tianjin 300131,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2024年第1期30-35,共6页
Technology of Water Treatment
基金
国家自然科学基金(21906012)。
