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Adsorption and co-precipitation behavior of arsenate, chromate, selenate and boric acid with synthetic allophane-like materials

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Title: Adsorption and co-precipitation behavior of arsenate, chromate, selenate and boric acid with synthetic allophane-like materials
Authors: Opiso, Einstine Browse this author
Sato, Tsutomu Browse this author
Yoneda, Tetsuro Browse this author →KAKEN DB
Keywords: Allophane
Boric acid
Issue Date: 15-Oct-2009
Publisher: Elsevier B.V.
Journal Title: Journal of Hazardous Materials
Volume: 170
Issue: 1
Start Page: 79
End Page: 86
Publisher DOI: 10.1016/j.jhazmat.2009.05.001
PMID: 19493614
Abstract: Pollution caused by boric acid and toxic anions such as As(V), Cr(VI) and Se(VI) is hazardous to human health and environment. The sorption characteristics of these environmentally significant ionic species on allophane-like nanoparticles was investigated in order to determine whether allophane can reduce their mobility in the subsurface environment at circum-neutral pH condition. Solutions containing 100 or 150 mmol of AlCl3. 6H2O were mixed to 100 mmol of Na4SiO4 and the pH were adjusted to 6.4 ± 0.3. The mineral suspensions were shaken for 1 hr and incubated at 80℃ for 5 days. Appropriate amounts of As, B, Cr and Se solutions were added separately during and after allophane precipitation. The results showed that As(V) and boric acid can be irreversibly fixed during co-precipitation in addition to surface adsorption. However, Cr(VI) and Se(VI) retention during and after allophane precipitation is mainly controlled by surface adsorption. The structurally fixed As(V) and boric acid were more resistant to release than those bound on the surface. The sorption characteristics of oxyanions and boric acid was also influenced by the final Si/Al molar ratio of allophane in which Al-rich allophane tend to have higher uptake capacity. The overall results of this study have demonstrated the role of allophane-like nanoparticles and the effect of its Si/Al ratio on As, B, Cr and Se transport processes in the subsurface environment.
Type: article (author version)
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: Einstine Opiso

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