Improving ion rejection of graphene oxide conductive membranes by applying electric field

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	Improving ion rejection of graphene oxide conductive membranes by applying electric field
	Sun, Jingqiu; Hu, Chengzhi; Wu, Baichun; Liu, Huijuan; Qu, Jiuhui
刊名	JOURNAL OF MEMBRANE SCIENCE
	2020-06-01
卷号	604 页码:1-10
关键词	Ascorbic acid reduction Multi-component Oxygen-containing functional groups Responsiveness
ISSN号	0376-7388
英文摘要	The influence of an electric field on graphene oxide (GO) membrane ion rejection rates was investigated. The variation in the rejection rate under unit voltage was used to evaluate the responsiveness of the GO membrane ion rejection rate in relation to an electric field. The results showed that the ratio of cations to anions in the nanochannel was a key factor that controlled the responsiveness to the electric field. The concentration of cations was higher than that of anions near GO flakes because the GO was negatively charged. The responsiveness was 0.62%/V for GO membranes without any membrane reduction, indicating that the rejection of Na2SO4 was enhanced by only 0.62% under a voltage of 1 V. When the GO membrane was partially reduced, the responsiveness increased to 21.83%/V due to the increased wrinkles (roughness), which increased specific capacitance of the membrane. With further reduction, the specific capacitance of the membrane was reduced due to the decreased charge density, leading to an enhanced Donnan effect under electric field. Therefore, the respon-siveness decreased to 15.45%/V. These findings provide an effective method to promote ion rejection by regulating the responsiveness of membrane ion rejection to an electric field.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44946]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Sun, Jingqiu,Hu, Chengzhi,Wu, Baichun,et al. Improving ion rejection of graphene oxide conductive membranes by applying electric field[J]. JOURNAL OF MEMBRANE SCIENCE,2020,604:1-10.
APA	Sun, Jingqiu,Hu, Chengzhi,Wu, Baichun,Liu, Huijuan,&Qu, Jiuhui.(2020).Improving ion rejection of graphene oxide conductive membranes by applying electric field.JOURNAL OF MEMBRANE SCIENCE,604,1-10.
MLA	Sun, Jingqiu,et al."Improving ion rejection of graphene oxide conductive membranes by applying electric field".JOURNAL OF MEMBRANE SCIENCE 604(2020):1-10.