As(iii) removal through catalytic oxidation and Fe(iii) precipitation

Kazumasa Oshima; Hiromichi Kondo; Eriko Konishi; Tsuyoshi Yamamoto; Yoshifumi Tsuge; Takayuki Watanabe; Masahiro Kishida

doi:10.1039/d2ra02537j

As(iii) removal through catalytic oxidation and Fe(iii) precipitation

RSC Adv. 2022 Jun 7;12(26):16843-16846. doi: 10.1039/d2ra02537j. eCollection 2022 Jun 1.

Authors

Kazumasa Oshima¹, Hiromichi Kondo¹, Eriko Konishi¹, Tsuyoshi Yamamoto¹, Yoshifumi Tsuge¹, Takayuki Watanabe¹, Masahiro Kishida¹

Affiliation

¹ Department of Chemical Engineering, Graduate School of Engineering, Kyushu University Motooka 744, Nishi-ku Fukuoka 819-0395 Japan kishida@chem-eng.kyushu-u.ac.jp.

Abstract

To remove arsenite (As(iii)) from wastewater effectively, the catalytic oxidation of As(iii) to arsenate (As(v)) and As(v) precipitation with iron ions (Fe(iii)) was investigated. The Pt/SiO₂ catalyst functioned as a reaction site for As(iii) with oxygen in the atmosphere. The combination of the Pt/SiO₂ catalyst and Fe(iii) precipitant improved the removal of As(iii) in the precipitate; Pt/SiO₂ worked as both an As(iii) oxidation site and precipitation site with Fe(iii) precipitant.