Effect of AlCl3 concentration on nanoparticle removal by coagulation

doi:10.1016/j.jes.2015.04.014

	Effect of AlCl3 concentration on nanoparticle removal by coagulation
	Zhang, Lizhu 2; Mao, Jingchun 2; Zhao, Qing 1; He, Shaobo 2; Ma, Jun 3
刊名	JOURNAL OF ENVIRONMENTAL SCIENCES
	2015-12-01
卷号	38 页码:103-109
关键词	Nanoparticles Coagulation Effective Coagulation Concentration Al3++
ISSN号	1001-0742
DOI	10.1016/j.jes.2015.04.014
英文摘要	In recent years, engineered nanoparticles, as a new group of contaminants emerging in natural water, have been given more attention. In order to understand the behavior of nanoparticles in the conventional water treatment process, three kinds of nanoparticle suspensions, namely multi-walled carbon nanotube-humic acid (MWCNT-HA), multiwalled carbon nanotube-N, N-dimethylformamide (MWCNT-DMF) and nanoTiO(2)-humic acid (TiO2-HA) were employed to investigate their coagulation removal efficiencies with varying aluminum chloride (AlCl3) concentrations. Results showed that nanoparticle removal rate curves had a reverse "U" shape with increasing concentration of aluminum ion (Al3+). More than 90% of nanoparticles could be effectively removed by an appropriate Al3+ concentration. At higher Al3+ concentration, nanoparticles would be restabilized. The hydrodynamic particle size of nanoparticles was found to be the crucial factor influencing the effective concentration range (ECR) of Al3+ for nanoparticle removal. The ECR of Al3+ followed the order MWCNT-DMF > MWCNT-HA > TiO2-HA, which is the reverse of the nanoparticle size trend. At a given concentration, smaller nanoparticles carry more surface charges, and thus consume more coagulants for neutralization. Therefore, over-saturation occurred at relatively higher Al3+ concentration and a wider ECR was obtained. The ECR became broader with increasing pH because of the smaller hydrodynamic particle size of nanoparticles at higher pH values. A high ionic strength of NaCl can also widen the ECR due to its strong potential to compress the electric double layer. It was concluded that it is important to adjust the dose of Al3+ in the ECR for nanoparticle removal in water treatment. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000370547800012
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/122477]
专题	中国科学院沈阳应用生态研究所
通讯作者	Zhang, Lizhu
作者单位	1.Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China 2.Harbin Inst Technol, Sch Sci, Dept Chem, Harbin 150090, Peoples R China 3.Harbin Inst Technol, Sch Municipal & Environm Engn, Harbin 150090, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Lizhu,Mao, Jingchun,Zhao, Qing,et al. Effect of AlCl3 concentration on nanoparticle removal by coagulation[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2015,38:103-109.
APA	Zhang, Lizhu,Mao, Jingchun,Zhao, Qing,He, Shaobo,&Ma, Jun.(2015).Effect of AlCl3 concentration on nanoparticle removal by coagulation.JOURNAL OF ENVIRONMENTAL SCIENCES,38,103-109.
MLA	Zhang, Lizhu,et al."Effect of AlCl3 concentration on nanoparticle removal by coagulation".JOURNAL OF ENVIRONMENTAL SCIENCES 38(2015):103-109.