Influences of surface-coated fulvic and humic acids on the adsorption of metal cations to SiO2 nanoparticles

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Influences of surface-coated fulvic and humic acids on the adsorption of metal cations to SiO2 nanoparticles
	Liang, Liang ; Lv, Jitao ; Luo, Lei ; Zhang, Jing ; Zhang, Shuzhen
刊名	COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
	2011-09-20
卷号	389 期号:*页码:27—32
中文摘要	Humic substances such as fulvic acid (FA) and humic acid (HA) exist universally in the environment and play an important role in the interfacial reactions of contaminants. In this study, influences of surface-coated FA and HA on the adsorption of metal cations of Cu(II), Pb(II) and Zn(II) on SiO2 nanoparticles (nano-SiO2, 20 nm) were investigated. The results showed that nano-SiO2 had high adsorption capacities for the metal cations following the sequence of Pb(II) > Cu(II) > Zn(II), irrespective of coating with FA or HA. Nano-SiO2 had a strong affinity for FA and HA, and coating with FA and HA significantly enhanced the adsorption of the metal cations on nano-SiO2. Cation adsorption on the original and coated nano-SiO2 followed the same pronounced increasing trend with increasing pH. X-ray absorption spectroscopy (XAS) analysis by taking Cu(II) as an example revealed that Cu(II) was adsorbed on nano-SiO2 by forming inner-sphere complexes; whereas its adsorption on FA/HA coated nano-SiO2 was through complexing with the hydroxyl moieties and organic functional groups of FA/HA as bridges. This work demonstrates that FA and HA can significantly change the adsorption capacities and mechanisms for metal cations and thus likely influence their behaviors in the environment. (C) 2011 Elsevier B.V. All rights reserved.
WOS记录号	WOS:000296937900005
公开日期	2012-10-15
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/7007]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Liang, Liang,Lv, Jitao,Luo, Lei,et al. Influences of surface-coated fulvic and humic acids on the adsorption of metal cations to SiO2 nanoparticles[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2011,389(*):27—32.
APA	Liang, Liang,Lv, Jitao,Luo, Lei,Zhang, Jing,&Zhang, Shuzhen.(2011).Influences of surface-coated fulvic and humic acids on the adsorption of metal cations to SiO2 nanoparticles.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,389(*),27—32.
MLA	Liang, Liang,et al."Influences of surface-coated fulvic and humic acids on the adsorption of metal cations to SiO2 nanoparticles".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 389.*(2011):27—32.