钴掺杂氮化碳活化过单硫酸盐高效降解水中磺胺二甲基嘧啶的研究
Cobalt-doped carbon nitride-activated peroxymonosulfate for efficient degradation of sulfamethazine
张荣哲 1汪黎东1
作者信息
- 1. 华北电力大学环境科学与工程系,河北 保定 071000
- 折叠
摘要
在花状球体氮化碳(FSCN)上掺杂钴金属制备出高效稳定的Co-FSCN催化剂.利用XRD、BET、SEM、XPS对催化剂进行表征,并探究不同条件对磺胺二甲基嘧啶(sulfamethazine,SMZ)降解效果的影响.结果表明,用Co-FSCN(0.1 g/L)活化过单硫酸盐(PMS)(0.163 mmol/L),在初始溶液pH7 的情况下2 min内对SMZ(20 mg/L)的降解率超过 98%.自由基淬灭实验证明,Co-FSCN/PMS体系中自由基途径与非自由基途径共存,羟基自由基(·OH)、超氧自由基(·O2-)与单线态氧(1 O2)均是参与SMZ降解的主要活性物种.Co-FSCN循环使用 3 次后仍表现出良好的稳定性.
Abstract
A promising efficient and stable Co-FSCN catalyst is prepared by doping cobalt onto flower-shaped carbon nitride(FSCN),and characterized by means of XRD,BET,SEM,and XPS.The effects of different conditions on the degradation of sulfamethazine are investigated.It is indicated that the degradation efficiency of 20 mg·L-1 sulfamethazine in the initial pH = 7 solution exceeds 98%within 2 minutes when 0.1 g·L-1 Co-FSCN activated 0.163 mmol·L-1 peroxymonosulfate(PMS)is served.The free radical quenching experiment proves that the radical pathway and non-radical pathway coexist in the Co-FSCN/PMS system.Hydroxyl radicals(·OH),superoxide radicals(·O2-),and singlet oxygen(1 O2)are the main active species involved in the degradation of sulfamethazine.After three cycles of Co-FSCN,the catalyst exhibits good stability.
关键词
磺胺二甲基嘧啶(SMZ)/过单硫酸盐(PMS)/Co-FSCN/自由基途径/非自由基途径Key words
sulfamethazine/peroxymonosulfate/Co-FSCN/radical pathway/non-radical pathway引用本文复制引用
基金项目
国家自然科学基金面上项目(51878273)
出版年
2024
NETL
NSTL
万方数据