钴、氮、硼掺杂氧化石墨烯催化剂的制备及催化臭氧氧化性能  

Preparation of cobalt,nitrogen and boron doped graphene oxide catalysts and its catalytic ozonation performance

作　　者：张远 郭子毅 王栋[1] ZHANG Yuan;GUO Ziyi;WANG Dong(School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学环境学院,辽宁大连116024

出　　处：《化工环保》2022年第4期471-478,共8页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金项目(51908529)。

摘　　要：采用水热—高温煅烧法制备了不同钴负载量的钴、氮、硼掺杂氧化石墨烯催化剂,并以布洛芬、对氯苯甲酸和草酸作为模型污染物进行了催化臭氧氧化实验。实验结果表明:钴负载量8%、焙烧温度500℃条件下制备的催化剂活性最高;在反应温度为323 K、pH为6.8、催化剂加入量为0.25 g/L、布洛芬质量浓度为50 mg/L、反应时间为10 min的条件下,布洛芬去除率可达99%。该催化剂催化臭氧氧化降解布洛芬的过程符合表面自由基参与的准一级动力学模型,且催化臭氧体系的反应速率常数约为单独臭氧体系的5倍。经高温再生的催化剂第5次使用时,催化活性仍能达到初次使用的92.1%。Cobalt,nitrogen and boron doped graphene oxide catalysts with different cobalt loading were prepared by hydrothermal calcination method,and the catalytic ozone oxidation experiments were carried out with ibuprofen,p-chlorobenzoic acid and oxalic acid as model pollutants.The results show that:The catalyst with the highest activity is prepared under the conditions of cobalt loading amount 8%and calcination temperature 500℃;Under the conditions of reaction temperature 323 K,pH 6.8,catalyst dosage 0.25 g/L,ibuprofen mass concentration 50 mg/L and reaction time 10 min,the removal rate of ibuprofen can reach 99%.The catalytic oxidation process of ibuprofen by ozone is in accordance with the quasi-first-order kinetic model involving surface free radicals,and the reaction rate constant of the catalytic oxidation system is about 5 times of that of the single ozone system.when the catalyst is regenerated by high temperature and used for the fifth time,its catalytic activity can still reach 92.1%of that of the initial catalyst.

关 键 词：氧化石墨烯 多原子掺杂 催化臭氧氧化 羟基自由基 

分 类 号：X703[环境科学与工程—环境工程]