Investigations on Adsorption of Inorganic Ions in Aqueous Solution to Some Metal Oxides, Hydroxides and a Carbonate by the X-Ray Spectroscopic Method

Hironori Ohashi, Kotaro Yonezu, Daisuke Kawamoto, Takushi Yokoyama

研究成果: Contribution to journalArticle査読

抄録

Why does the adsorption and concentration of inorganic chemical species proceed at aqueous–solid interfaces? In this review paper, we discuss the use of X-ray chemical state analysis to elucidate the intrinsic adsorption mechanism. Based on the chemical states of the species adsorbed to solids as determined by X-ray chemical state analysis, possible adsorption mechanisms are discussed. The driving forces of adsorption are represented by the Gibbs free energy change (ΔGchem = ΔGchem,1 + ΔGchem,2) resulting from the formation of covalent bonds between metal ions (M) in metal oxides or hydroxides and adsorbed species (X) (M–O–X bond, ΔGchem,1) and the formation of new phases consisting of M and X (ΔGchem,2). The concept of ΔGchem,2 is proposed based on the experimental results from chemical state analyses. As examples, the following investigations are discussed in this review paper: the formation of mullite precursors by the adsorption of monosilicic acid to Al(OH)3, the spontaneous reduction of Au(III) to Au(0) by adsorption of Au(III) to Al(OH)3, MnO2 and Ni(OH)2 and the mechanism of concentration of Co2+, Tl+, Pb2+, Pt2+, Au+, and Pd2+ in marine ferromanganese crusts.

本文言語英語
ページ(範囲)1321-1330
ページ数10
ジャーナルanalytical sciences
37
10
DOI
出版ステータス出版済み - 2021

All Science Journal Classification (ASJC) codes

  • 分析化学

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