Comparison of naphthalene degradation by hydrogen peroxide, nano-calcium peroxide, peroxydisulfate, and peroxymonosulfate in the Fe(II)-citric acid catalytic environments

Water Supply Pub Date : 2024-01-17 DOI:10.2166/ws.2024.004

Ruzhuang Zhang, Xingbin Fang, Yulong Liu, Ming Li, Guilu Zeng, Rumin Yang, Yiqin Qiu, Shuguang Lyu

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Abstract

Naphthalene (NAP) was chosen as a target contaminant due to its increasing environmental concern in this work. Using hydrogen peroxide (H2O2), nano-calcium peroxide (nCP), peroxydisulfate (PDS), and peroxymonosulfate (PMS) as oxidants activated by Fe(II)-citric acid (CA) in aqueous solution, 92.8, 95.0, 97.5, and 99.9% of NAP were removed, respectively, in which CA could significantly enhance NAP degradation. HO• was demonstrated to be the major radical responsible for NAP removal in H2O2/Fe(II)/CA and nCP/Fe(II)/CA processes; both HO• and SO4•− were major radicals in PDS/Fe(II)/CA process, whereas SO4•− was the sole dominant radical in PMS/Fe(II)/CA process. The impacts of water matrices (anions, natural organic matters, and surfactants) and initial solution pH on NAP removal as well as the practicalities of these four systems in groundwater were explored. The efficient NAP degradation of nCP/Fe(II)/CA and PMS/Fe(II)/CA processes in the actual groundwater indicated that these two systems have great potential and advantages in the remediation of NAP-contaminated groundwater.

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过氧化氢、纳米过氧化钙、过氧化二硫酸盐和过氧化单硫酸盐在铁(II)-柠檬酸催化环境中降解萘的比较

由于萘（NAP）对环境的影响日益严重，本研究选择萘作为目标污染物。以过氧化氢（H2O2）、纳米过氧化钙（nCP）、过氧化二硫酸盐（PDS）和过氧化单硫酸盐（PMS）为氧化剂，经铁（II）-柠檬酸（CA）在水溶液中活化，NAP的去除率分别为92.8%、95.0%、97.5%和99.9%，其中CA能显著增强NAP的降解。在H2O2/Fe(II)/CA和nCP/Fe(II)/CA过程中，HO-是去除NAP的主要自由基；在PDS/Fe(II)/CA过程中，HO-和SO4-都是主要自由基，而在PMS/Fe(II)/CA过程中，SO4-是唯一的主要自由基。研究还探讨了水基质（阴离子、天然有机物和表面活性剂）和初始溶液 pH 对 NAP 去除的影响，以及这四种体系在地下水中的实用性。在实际地下水中，nCP/Fe(II)/CA 和 PMS/Fe(II)/CA 工艺对 NAP 的高效降解表明，这两种工艺在修复受 NAP 污染的地下水方面具有巨大的潜力和优势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Water Supply

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