Enhanced degradation of organic contaminants in water by peroxydisulfate coupled with bisulfite
Enhanced degradation of organic contaminants in water by peroxydisulfate coupled with bisulfite
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过二硫酸盐与亚硫酸氢盐结合增强水中有机污染物的降解
DOI：
10.1016/j.jhazmat.2017.01.010
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发表时间：
2017-04-15
影响因子：
13.6
通讯作者：
Zhang, Huijuan
中科院分区：
文献类型：
--
作者：
Qi, Chengdu;Liu, Xitao;Zhang, Huijuan
本研究创新性地将聚合反应中广泛使用的亚硫酸氢盐-过二硫酸盐体系(S(IV)/PDS)应用于水中有机污染物的降解。在PDS体系中加入S(IV)，可使环境中常见的内分泌干扰物双酚A的降解率在360min内从17.0%提高到84.7%。在S(IV)/PDS体系中，双酚A的降解符合准一级动力学，反应速率常数值在0.00005~0.02717 m in(-1)之间，与初始S(IV)和PDS的投加量、溶液pH、反应温度、氯化物和水的类型有关。并通过氮气吹扫实验、自由基清除实验和电子自旋共振(ESR)分析对其可能的作用机理进行了初步探讨。结果表明，在S(IV)/PDS体系中，硫酸根是主要的反应物种。最后，根据LC-MS和GC-MS的结果，BPA的降解途径包括β-裂解(C-C)、羟化、脱水、氧化骨架重排和开环。这项研究有助于表征PDS与常见的工业污染物无机S(IV)结合产生的活性物种，以促进水中有机污染物的降解。(C)2017爱思唯尔B.V.保留所有权利。
In this study, the bisulfite-peroxydisulfate system (S(IV)/PDS) widely used in polymerization was innovatively applied for organic contaminants degradation in water. The addition of S(IV) into PDS system remarkably enhanced the degradation efficiency of bisphenol A (BPA, a frequently detected endocrine disrupting chemical in the environments) from 17.0% to 84.7% within 360 min. The degradation efficiency of BPA in the S(IV)/PDS system followed pseudo-first-order kinetics, with rate constant values ranging from 0.00005 min(-1) to 0.02717 min(-1) depending on the operating parameters, such as the initial S(IV) and PDS dosage, solution pH, reaction temperature, chloride and water type. Furthermore, nitrogen purging experiment, radical scavenging experiment and electron spin resonance (ESR) analysis were used to elucidate the possible mechanism. The results revealed that sulfate radical was the dominant reactive species in the S(IV)/PDS system. Finally, based on the results of liquid chromatography-mass spectrometry (LC-MS) and gas chromatography-mass spectrometry (GC-MS), the BPA degradation pathway was proposed to involve beta-scission (C-C), hydroxylation, dehydration, oxidative skeletal rearrangement, and ring opening. This study helps to characterize the combination of PDS and inorganic S(IV), a common industrial contaminant, to generate reactive species to enhance organic contaminants degradation in water. (C) 2017 Elsevier B.V. All rights reserved.