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Resolving the kinetic and intrinsic constraints of heat-activated peroxydisulfate oxidation of iopromide in aqueous solution

文献类型： 外文期刊

作者： Wang, Zhaohui 1 ; Wang, Xiaoxiao 2 ; Yuan, Ruixia 4 ; Xiao, Dongxue 5 ;

作者机构： 1.East China Normal Univ, Sch Ecol & Environm Sci, Shanghai Key Lab Urbanizat & Ecol Restorat, Shanghai 200241, Peoples R China

2.Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China

3.Inst Ecochongming IEC, Shanghai 200062, Peoples R China

4.Northeast Petr Univ, Coll Chem & Chem Engn, Daqing 163318, Peoples R China

5.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Shanghai 200090, Peoples R China

关键词： Peroxydisulfate; Reaction orders; Degradation pathway; Alkyl chain

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN： 0304-3894

年卷期： 2020 年 384 卷

页码：

收录情况： SCI

摘要： Iopromide (IOP) has been identified as one of the most persistent pharmaceuticals in wastewater treatment processes, however, kinetic and intrinsic factors constraining its fast removal in advanced oxidation processes (AOPs) are yet to be resolved. Here oxidation of IOP by heat-activated peroxydisulfate (PDS) was investigated both experimentally and theoretically. Rates of IOP degradation were enhanced by elevating solution temperature and acidity. An apparent kinetic rate equation was developed, based on the pseudo-first-order reaction model and assumption of steady state of SO4 center dot-. The common water constituents showed inhibitory effects on IOP decomposition to various extent. An insufficient supply of SO4 center dot- was considered as the major kinetic constraint. Eight byproducts were identified and most of which had intact triiodinated benzene ring. O-demethylation, oxidation of amino moiety and oxidation/elimination of alcohol groups are proposed as the primary degradation pathways, in accordance with the incomplete mineralization and non-detectable release of inorganic iodine. Quantum chemical calculations predict that oxidation of alkyl chains of IOP preferentially occurs and IOP byproducts with shorter side chains and intact triiodinated ring are more reactive than IOP. By virtue of the identified kinetic and intrinsic constraints, strategies to maximize degradation efficiency of IOP are proposed.

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