欢迎访问《环境科学学报》编辑部网站！

快速检索			高级检索

研究报告

仇一帆,杨佐毅,宋卫锋,陈舒棋,马双念,白晓燕.Fe₃O₄-CeO_x/AC催化剂的制备及其催化臭氧氧化降解盐酸四环素[J].环境科学学报,2022,42(8):146-155

Preparation of Fe₃O₄-CeO_x/AC magnetic catalyst and degradation of tetracycline hydrochloride by catalytic ozonation

摘要：四环素是一种常见抗生素，近些年来在地表水中被频繁检出，严重威胁水体安全及人类健康.采用水热法及浸渍焙烧法制备了Fe₃O₄-CeO_x/AC催化剂，考察了利用该催化剂在臭氧氧化水中四环素中的性能，结果表明：在煅烧温度为600 ℃，煅烧时间为3 h，制备浸渍液中Fe₃O₄、Ce（NO₃）₃·6H₂O、活性炭质量比为2∶1∶2的条件下，该催化剂效果最好，且持续实验90 min后仍可保持催化活性和较低的金属浸出率.当四环素初始浓度为20 mg·L^-1，臭氧用量为4 mg·L^-1·min^-1，溶液初始pH为5，催化剂投加量为0.2 g·L^-1时，10 min内四环素去除率可达99%以上，90 min内TOC去除率达到38%.利用SEM、XPS等多种手段对该催化剂进行了表征，通过淬灭实验证实在体系中·OH起到了催化作用.

Abstract：Tetracycline （TC）， a common antibiotic， has been frequently detected in surface water in recent years and poses a serious threat to aquatic environment safety and human health. In this study， Fe₃O₄-CeO_x/AC catalyst was prepared by hydrothermal and impregnation roasting， and its performance on ozonation of tetracycline in water was investigated. The results show that the optimum conditions for preparation of the catalyst were defined as calcination temperature 600 ℃， calcination time 3 h， and mass ratio of Fe₃O₄， Ce（NO₃）₃·6H₂O and activated carbon 2∶1∶2 in the impregnation solution，and the catalytic activity and low metal leaching rate can be maintained after continuous reaction for 90 minutes. 99% of TC， corresponding to 38% TOC removal was achieved whithin 10 minutes at initial TC concentration of 20 mg·L^-1， ozone dosage 4 mg·L^-1·min^-1， initial pH 5， and catalyst dosage of 0.2 g·L^-1. The catalyst was characterized by SEM， XPS and other methods， and the quenching experiment proved that ·OH played a major role in the system.