环境工程学报2025，Vol.19Issue(3)：568-577,10.DOI:10.12030/j.cjee.202403023
双包覆型过硫酸盐缓释材料的制备及其对地下水中磺胺甲恶唑的去除
Preparation of a double-coated persulfate slow-release material for sulfamethoxazole removal from groundwater
摘要
Abstract
To address the issue of shortened lifespan in single-layer persulfate slow-release materials due to rapid initial release,polycaprolactone-silica sand was taken as the outer-layer material,which covered on the inner-layer with a combination of sodium persulfate and polycaprolactone-silica sand,to synthesize a double-coated persulfate slow-release material.The static release experiments were used to evaluate the release behavior and mechanism of persulfate slow-release materials with or without the outer-layer material.Its performance on sulfamethoxazole(SMZ)degradation in groundwater was investigated through iron-nitrogen co-doped biochar(Fe@N-BC)activating persulfate released from the double-coated persulfate slow-release material.The results showed that the release rate of the double-coated persulfate slow-release material was more stable than that of the single-layer slow-release one over the release period,and the release kinetics of the former material were more fitted by zero-order release kinetics than the latter one.At an outer layer thickness of 0.25 cm and a silica sand/PCL ratios between 2 and 5,the release rate of the double-coated slow-release material was stable with an effective performance.After 21 days of slow release,the slow-release rates of the double-coated slow-release materials with sand/PCL ratios of 3 and 4 were 35.52％and 47.27％,respectively.At the same ratio of silica sand/PCL,the release rate of the double-coated slow-release material increased as the thickness of the outer layer decreased,and the stable release could maintain at least 21 days.At pH3,the highest SMZ degradation rate occurred,and the removal rate for 1 mg/L SMZ could reach 100％within 12 hours.As the initial concentration of SMZ increased,the time required for complete degradation also increased.The above study result could provide a reference for realizing the sustained and stable release of persulfate and removing SMZ in in groundwater.关键词
过硫酸盐/双层缓释材料/地下水/磺胺甲恶唑Key words
persulfate/double-layer slow-release material/ground water/sulfamethoxazole分类
环境科学引用本文复制引用
夏玉瑾,胡志欣,董鲁钰,张渺,杨胜科,王雪丽..双包覆型过硫酸盐缓释材料的制备及其对地下水中磺胺甲恶唑的去除[J].环境工程学报,2025,19(3):568-577,10.基金项目
国家重点研发计划资助项目(2020YFC1808300) （2020YFC1808300）
陕西省自然科学基金资助项目(2022JQ-081) （2022JQ-081）
