HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >

Surface complexation reactions of inorganic anions on hydrotalcite-like compounds

Files in This Item:
JCIS384-1_99-104.pdf736.62 kBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/50355

Title: Surface complexation reactions of inorganic anions on hydrotalcite-like compounds
Authors: Morimoto, Kazuya Browse this author
Anraku, Sohtaro Browse this author
Hoshino, Jun Browse this author
Yoneda, Tetsuro Browse this author →KAKEN DB
Sato, Tsutomu Browse this author →KAKEN DB
Keywords: Hydrotalcite-like compounds
Layered double hydroxides
Inorganic anions
Adsorption
Surface complexation reactions
Ionic potential
Solubility
Issue Date: 15-Oct-2012
Publisher: Elsevier
Journal Title: Journal of Colloid and Interface Science
Volume: 384
Issue: 1
Start Page: 99
End Page: 104
Publisher DOI: 10.1016/j.jcis.2012.06.072
Abstract: Complexation reactions of environmentally important inorganic anions such as nitrate, chloride, sulfate, arsenate, and phosphate on the surface of hydrotalcite-like compounds (HT) were investigated to understand the role of HT in the immobilization of hazardous anions in an alkaline environment. The effects of surface complexation reactions on the solid state properties of HT were also evaluated to understand their stability. Synthetic HT was used for the adsorption and post-adsorption experiments. The obtained adsorption isotherms showed that the order of selectivity of HT for anions was NO3 < Cl < SO4 << AsO4 < PO4. To distinguish the adsorption mechanisms (inner-sphere complexes or outer-sphere complexes) of these anions, zeta potential measurements and infrared absorption spectroscopic analysis were performed. The results indicated that NO3 and Cl were adsorbed as diffuse ions on the outer surfaces of the HT, while SO4 formed outer-sphere complexes with a strong electrostatic interaction. Moreover, AsO4 and PO4 formed inner-sphere complexes via a ligand substitution reaction on the HT surfaces. And it was suggested that oxyanions with low ionic potential, such as AsO4 and PO4, had a tendency to form inner-sphere complexes with the HT surfaces. The formation of inner-sphere complexes shifted the isoelectric point and the surface charge of the HT. Furthermore, the solubility of the HT was reduced by the inner-sphere complexes with PO4 and AsO4. It was revealed, that the formation of inner-sphere complexes on the HT surfaces contributed to the stabilization of the HT, as well as a decrease in the mobility of these anions.
Type: article (author version)
URI: http://hdl.handle.net/2115/50355
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐藤 努

Export metadata:

OAI-PMH ( junii2 , jpcoar )

MathJax is now OFF:


 

 - Hokkaido University