改性氧化石墨烯膜处理印染废水的能力与机理
Ability and mechanism of modified graphene oxide membrane for treatment of printing and dyeing wastewater
孙炜鹏 1张海鹏 1刘欣 2陈爽 1郭逢普1
作者信息
- 1. 中国石油大学(华东) 化学化工学院,山东 青岛 266021
- 2. 胜利石油管理局有限公司供水分公司,山东 东营 257097
- 折叠
摘要
在m[硫脲(TU)]∶m[氧化石墨烯(GO)]=1∶2、pH=9、反应温度80℃、反应时间60 min的条件下制备了TU改性GO纳米片(记为TU-GO),将TU-GO在聚醚砜(PES)微孔膜上沉积,制备出TU改性GO膜(记为TU-GOM).当TU-GOM在PES上的负载量为238.73 mg/m2时,其对甲基橙(MO)、罗丹明B(RhB)、亚甲基蓝(MB)的截留率分别为 94.01%、87.07%和 99.67%.为优化TU-GO对RhB的截留效果,使用TU和氯化胆碱(ChCl)组成低共熔溶剂(DES)制备了改性氧化石墨烯膜(DES-GOM).在m(TU)∶m(ChCl)=1∶2、改性温度90℃、改性时间1 h的最佳条件下,制备的DES-GOM对MO、MB的截留率分别为93.95%、99.24%,对RhB截留率提升至 99.16%.采用SEM、EDS、FTIR、XRD及拉曼光谱对样品进行了表征,对TU交联GO过程的还原机理和增稳机理进行了分析.
Abstract
Thiourea(TU)modified graphene oxide(GO)nanosheets(named as TU-GO)were prepared under the conditions of m(TU)∶m(GO)=1∶2,reaction temperature 80℃,and reaction time 60 min,and then deposited on polyether sulfone(PES)micropore membrane to obtain TU modified GO membrane(named as TU-GOM).When the loading capacity of TU-GOM on PES was 238.73 mg/m2,the retention rates of Methyl Orange(MO),Rhodamine B(RhB)and methylene blue(MB)were 94.01%,87.07%and 99.67%,respectively.Modified graphene oxide membrane(DES-GOM)was synthesized using TU and choline chloride(ChCl)as a deep eutectic solvent(DES)to further optimize the rejection rate of RhB.Under the optimum conditions of m(TU)∶m(ChCl)=1∶2,modification temperature of 90℃and modification time of 1 h,the retention rates of the prepared DES-GOM for MO and MB were 93.95%and 99.24%,respectively,while that for RhB was increased to 99.16%.The samples were characterized by SEM,EDS,FTIR,XRD and Raman spectroscopy,followed by analysis on the reduction mechanism and stability enhancement mechanism of TU crosslinking GO process.
关键词
氧化石墨烯膜/硫脲/低共熔溶剂/氯化胆碱/水处理技术Key words
graphene oxide membranes/thiourea/deep eutectic solvents/choline chloride/water treatment technology引用本文复制引用
出版年
2024
NETL
NSTL
万方数据