废钢渣负载CuO制备催化剂活化过硫酸盐降解磺胺类抗生素的研究  

Activation of Persulfate for the Degradation of Sulphonamides Antibiotics by Scrap Steel Slag Loaded CuO Preparation Catalyst

作　　者：殷可可 李桂菊 YIN Keke;LI Guiju(College of Marine and Environmental Sciences,Tianjin University of Science&Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学海洋与环境学院,天津300457

出　　处：《天津科技大学学报》2023年第3期29-36,共8页Journal of Tianjin University of Science & Technology

摘　　要：以废钢渣(SSS)为原料,通过化学沉淀法在SSS表面引入CuO,制备一种高效的、可回收的非均相催化剂CuO/SSS,并将其用于去除废水中传统生物处理难降解的磺胺类抗生素〔磺胺对甲氧嘧啶(SMD)、磺胺嘧啶(SDZ)和磺胺甲恶唑(SMX)〕.在催化剂投加量1~2 g/L、过硫酸钾(PS)投加量2~4 mmol/L、反应时间30 min的最佳反应条件下,CuO/SSS+PS对20 mg/L的3种不同磺胺类抗生素的去除率均超过75%,其中SMD的去除率达到80.29%.另外,在海水、湖水和自来水基质中,CuO/SSS+PS对SMD的去除率略微降低至54%~76%,这主要归因于存在于真实天然水中的各种无机阴离子.通过密度泛函理论(DFT)和液相色谱-质谱联用仪(LC/MS)的结果模拟了SMD的降解路径,得出主要降解途径是嘧啶环打开、O2S—NH键断裂、自由基攻击苯环.CuO/SSS+PS在去除难降解抗生素SMD时具有高效性,为活化过硫酸盐降解难降解有机废水寻得了一条途径.A highly efficient and recyclable non-homogeneous catalyst CuO/SSS was prepared by chemical precipitation with the introduction of CuO on the surface of the pristine material scrap steel slag(SSS).The catalyst was used for the removal of Sulphonamides antibiotics[sulfonamide(SMD),sulfadiazine(SDZ)and sulfamethoxazole(SMX)]from wastewater that are difficult to degrade by conventional biological treatment.The results showed that CuO/SSS+PS attained more than 75%removal of 20 mg/L of sulfonamide antibiotics under optimal conditions with CuO/SSS at 1-2 g/L and PS at 2-4 mmol/L for 30 min,with the highest removal rate of 80.29%for sulfamethoxazole.Moreover,the removal of sulfonamide(SMD)by CuO/SSS+PS was slightly reduced to 54%-76%in seawater,lake water and tap water matrices,which was mainly attributed to the presence of various inorganic anions in real natural water.The degradation pathways of sulfonamide were simulated by density functional theory(DFT)and the result of LC/MS,and the main degradation pathways were pyrimidine ring opening,O2S—NH bond breaking,and free radical attack on the benzene ring.In view of the high efficiency of CuO/SSS+PS in the removal of refractory antibiotic SMD,a pathway was found for the degradation of refractory organic wastewater by activated persulfate.

关 键 词：废钢渣 CUO 磺胺废水 密度泛函理论 

分 类 号：X75[环境科学与工程—环境工程]