Removal of ciprofloxacin from aqueous solutions by ionic surfactant-modified carbon nanotubes

doi:10.1016/j.envpol.2018.08.059

	Removal of ciprofloxacin from aqueous solutions by ionic surfactant-modified carbon nanotubes
	Li, Haibo 1,2,3; Wu, Wenhao 2; Hao, Xiangxiang 3; Wang, Shuai 1; You, Mengyang 3; Han, Xiaozeng 3; Zhao, Qing 4; Xing, Baoshan 2
刊名	ENVIRONMENTAL POLLUTION
	2018-12-01
卷号	243 页码:206-217
关键词	Carbon nanotubes Ciprofloxacin Ionic surfactants Adsorption Desorption
ISSN号	0269-7491
DOI	10.1016/j.envpol.2018.08.059
英文摘要	Ionic surfactants may impact removal efficiency of organic contaminants from aqueous solution, but research regarding the adsorption mechanisms on surfactant-modified carbon nanotubes (CNTs) was limited. In this study, three multi-walled and one single-walled CNTs were used as adsorbents to investigate the adsorption behavior and mechanisms of ciprofloxacin (CIP) on CNTs modified by ionic surfactants (cationic CTAB (Cetyltrimethylamnonium bromide) or anionic SDS (Sodium dodecyl sulfate)). More than 80% (82-88%) of the total removed CIP on CTAB-modified CNTs occurred within the first 6 h, much higher than that on SDS-modified CNTs (57-78%). Modeling adsorption kinetics demonstrated that CIP adsorption on surfactant-modified CNTs was controlled by multiple and faster processes, and both external mass transfer and intraparticle diffusion are limiting factors. Relative to SDS, CTAB was significantly (P < 0.001) concentration-dependent in suppressing CIP removal. Besides, the increase in 1/n values of Freundlich model with increasing CTAB concentration suggested that CTAB could be a stronger competitor for CIP adsorption. Hydrophobic interactions predominated zwitterionic CIP adsorption on all CNTs tested, while electrostatic interactions could help control ionizable CIP adsorption on surfactant modified CNTs depending upon pH. CIP adsorption on modified SWCNTs significantly declined with increasing ionic strength from 1 mM to 100 mM relative to those multi-walled CNTs because the more favorable aggregation of SWCNTs reduced the CIP adsorption, irrespective of which surfactant was added. Significant desorption hysteresis of adsorbed CIP released by SDS and water was observed, but not by CTAB, by which 32.6-54.4% of adsorbed CIP were removed. For SDS-modified CNTs, the mean release ratio (RR) followed an order of MWCNTs (0.075) > MHCNTs (0.058) > SWCNTs (0.057) > MCCNTs (0.049), significantly (P < 0.001) lower than CTAB-CNTs (0.37-0.56). It can be predicted that the tested surfactants co-existing with CNTs depress removal efficiency of diverse contaminants similar to CIP in aqueous systems. (C) 2018 Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China[41601235] ; National Natural Science Foundation of China[41771327] ; National Natural Science Foundation of China[41703107] ; SCI-TECH program from JLED, China[2015374] ; JLASTU, China[2015244] ; JLASTU, China[2015X010] ; CSC
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000449891800022
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/123731]
专题	中国科学院沈阳应用生态研究所
通讯作者	Xing, Baoshan
作者单位	1.Jilin Univ Agr Sci & Technol, Sch Agr, Jilin 132101, Jilin, Peoples R China 2.Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA 3.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Natl Field Res Stn Agroecosyst Hailun, Harbin 150081, Heilongjiang, Peoples R China 4.Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Li, Haibo,Wu, Wenhao,Hao, Xiangxiang,et al. Removal of ciprofloxacin from aqueous solutions by ionic surfactant-modified carbon nanotubes[J]. ENVIRONMENTAL POLLUTION,2018,243:206-217.
APA	Li, Haibo.,Wu, Wenhao.,Hao, Xiangxiang.,Wang, Shuai.,You, Mengyang.,...&Xing, Baoshan.(2018).Removal of ciprofloxacin from aqueous solutions by ionic surfactant-modified carbon nanotubes.ENVIRONMENTAL POLLUTION,243,206-217.
MLA	Li, Haibo,et al."Removal of ciprofloxacin from aqueous solutions by ionic surfactant-modified carbon nanotubes".ENVIRONMENTAL POLLUTION 243(2018):206-217.