EXAFS studies on adsorption irreversibility of Zn(II) on TiO(2): Temperature dependence.

EXAFS studies on adsorption irreversibility of Zn(II) on TiO(2): Temperature dependence. Research Abstract Details 

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EXAFS studies on adsorption irreversibility of Zn(II) on TiO(2): Temperature dependence. Abstract Text:

Wei Li,Gang Pan,Meiyi Zhang,Dongye Zhao,Yuhuan Yang,Hao Chen,Guangzhi He,Wei Li,Gang Pan,Meiyi Zhang,Dongye Zhao,Yuhuan Yang,Hao Chen,Guangzhi He,

Adsorption irreversibility of Zn(II) on TiO(2) at various temperatures was studied using a combination of classical macroscopic methods and extended X-ray absorption fine structure (EXAFS) spectroscopy. When the temperature was increased from 5 to 40 degrees C, the Zn(II) adsorption capacity increased by 130%, and adsorbed Zn(II) became more reversible. The standard Gibbs free energy change (DeltaG(0)) of the adsorption reaction at 5, 20, and 40 degrees C was determined to be -19.58+/-0.30, -22.28+/-0.10, and -25.14+/-0.21 kJmol(-1), respectively. And the standard enthalpy (DeltaH(0)) and entropy (DeltaS(0)) were 24.55+/-2.91 kJmol(-1) and 159.13+/-0.53 Jmol(-1)K(-1), respectively. EXAFS spectra results showed that the hydrated Zn(II) was adsorbed through fourfold coordination with an average ZnO bond distance of 1.98+/-0.01 A. Two ZnTi atomic distances of 3.25+/-0.02 and 3.69+/-0.03 A were observed, which corresponded to an edge-sharing linkage mode (strong adsorption) and a corner-sharing linkage mode (weak adsorption), respectively. As the temperature increased from 5 to 40 degrees C, the number of strong adsorption sites (N(1)) remained relatively constant while the number for the weak adsorption sites (N(2)) increased by 31%. These results indicate that the net gain in adsorption capacity and the decreased adsorption irreversibility at elevated temperatures were due to the increase in available weak adsorption sites (N(2)) or the decrease in the ratio of N(1)/N(2). Both the macroscopic sorption/desorption equilibrium data and the molecular level evidence of this study suggest that in a given environmental system (e.g., soils or natural waters) zinc and other similar heavy metals are likely more mobile at higher temperatures.

EXAFS studies on adsorption irreversibility of Zn(II) on TiO(2): Temperature dependence. Publishing Authors By Initials

W Li,G Pan,M Zhang,D Zhao,Y Yang,H Chen,G He,W Li,G Pan,M Zhang,D Zhao,Y Yang,H Chen,G He,

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EXAFS studies on adsorption irreversibility of Zn(II) on TiO(2): Temperature dependence. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of colloid and interface science

VOLUME: 319

Page Numbers: 385-91

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ISSN: 0021-9797

DAY: 26

MONTH: 12

YEAR: 2007

EXAFS studies on adsorption irreversibility of Zn(II) on TiO(2): Temperature dependence. Information

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LANGUAGE: eng

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Grant and Affiliation Information for EXAFS studies on adsorption irreversibility of Zn(II) on TiO(2): Temperature dependence.

AFFILIATION: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.

Country: United States

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MEDLINETA: J Colloid Interface Sci

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