氮掺杂石墨烯高效移除水中4-氯苯酚  

Efficient removal of 4-chlorophenol in water by nitrogen doped reduced graphene oxide

作　　者：王小波 唐鹏 丁聪 曹小艳 袁颂东[2] 左小华 邓祥义 

机构地区：[1]湖北理工学院化学与化工学院,黄石435003 [2]湖北工业大学,太阳能高效利用湖北省协同创新中心,武汉430068

出　　处：《环境化学》2017年第12期2641-2649,共9页Environmental Chemistry

基　　金：国家自然科学基金(51372077);湖北省教育厅青年项目(Q20164503);湖北理工学院引进人才项目(16xjz06R,17xjz01C)资助~~

摘　　要：采用水热法分别制备了未掺氮和氮掺杂还原氧化石墨烯(N-RGO),以此作为催化性吸附剂,通过活化过硫酸盐(PS)在水相中同时吸附和氧化降解对氯苯酚(4-CP).氮的引入不仅增强石墨烯吸附性能,而且提高其活化PS能力.通过比较未掺氮RGO与N-RGO对初始浓度为40 mg·L^(-1)的4-CP的吸附和降解速率发现,吸附移除率从21.6%增加至39.4%,对应的降解速率常数k值也从0.003 min^(-1)增加至0.13 min^(-1).随后研究了N掺杂量、PS初始浓度、N-RGO用量及反应温度对吸附降解过程的影响.结果表明,当氨水浓度为14000 mg·L^(-1)时所制备的N-RGO的性能最优.在PS初始浓度为540 mg·L^(-1),催化剂用量为120 mg·L^(-1),pH值为6.6,温度为25℃时,25 min对40 mg·L^(-1)的4-CP的总移除率达93%以上.通过稳定性测试显示N-RGO经4次循环使用后仍具有较高性能,该体系在污水处理领域具有良好应用前景.Nitrogen doped reduced graphene oxide（N-RGO） and N-free RGO were prepared by hydrothermal treatment of reduced graphene oxide with or without ammonia at 180 ℃.The adsorption and degradation of 4-chlorophenol（4-CP） on N-free RGO and N-RGO by activating persulfate were studied.The nitrogen modification enhanced not only its adsorption ability,but also its activation ability toward persulfate.Comparing the kinetics of adsorption and degradation of 4-CP（initial concentration 40 mg·L^（-1）） on N-free RGO and N-RGO,the adsorption removal rate was increased from 21.6% to 39.4% and the apparent degradation rate constant k was increased from 0.03 min^（-1） to 0.13 min^（-1） after nitrogen modification.The effects of the content of doped N,the amount of PS and N-RGO dosage on the adsorption and degradation of 4-CP were investigated.Under the optimized conditions（ammonia concentration 14000 mg · L^（-1）,dosage 120 mg·L^（-1）,PS concentration540 mg·L^（-1）,pH 6.6 and reaction temperature 25 ℃）,the total removal rate of 4-CP（initialconcentration 40 mg·L^（-1）） within 25 min reached more than 93%.N-RGO can be recycled which shows a good application prospect in the wastewater treatment.

关 键 词：氮掺杂还原氧化石墨烯 过硫酸盐 吸附 降解 对氯苯酚 

分 类 号：X703[环境科学与工程—环境工程]