Particle Concentration Effect on Zn(II) Adsorption at Water-Goethite Interfaces

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	Particle Concentration Effect on Zn(II) Adsorption at Water-Goethite Interfaces
	Xu Cong ; Li Wei ; Pan Gang
刊名	ACTA PHYSICO-CHIMICA SINICA
	2009-09
卷号	25 期号:9 页码:1737-1742
关键词	Temperature Particle concentration effect Adsorption reversibility Adsorption-desorption Zn(II) Goethite
中文摘要	The adsorption and desorption behaviors of Zn(II) on water-goethite interfaces under various particle concentrations (C-p) and temperatures were studied using traditional batch experiments. The Zn(II)/alpha-FeOOH adsorption system exhibited a significant particle concentration effect, in other words adsorption isotherms decreased as C-p increased. The adsorption also became less reversible because as the C-p increased which was demonstrated by the hysteresis angle (theta) and thermodynamic index of irreversibility (TII) as derived from adsorption and desorption isotherms. This agrees with the explanation of the particle concentration effect as postulated in metastable-equilibrium adsorption (MEA) theory. Furthermore, the particle concentration effect became more obvious at lower temperatures. Adsorption of Zn(II) on goethite surfaces was found to increase greatly with the increase of temperature and the adsorption became more reversible. These results further confirmed that the C-p effect is the result of changes in adsorption reversibility. The study also showed that the adsorption was a simultaneous (positive Delta S value of 195.71 J.mol(-1).K-1) and endothermic (positive Delta H value of 34.07 kJ.mol(-1)) chemisorption process.
WOS记录号	WOS:000269961300005
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/21706]
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	Xu Cong,Li Wei,Pan Gang. Particle Concentration Effect on Zn(II) Adsorption at Water-Goethite Interfaces[J]. ACTA PHYSICO-CHIMICA SINICA,2009,25(9):1737-1742.
APA	Xu Cong,Li Wei,&Pan Gang.(2009).Particle Concentration Effect on Zn(II) Adsorption at Water-Goethite Interfaces.ACTA PHYSICO-CHIMICA SINICA,25(9),1737-1742.
MLA	Xu Cong,et al."Particle Concentration Effect on Zn(II) Adsorption at Water-Goethite Interfaces".ACTA PHYSICO-CHIMICA SINICA 25.9(2009):1737-1742.