Study on the catalytic process to innovate removal process of toxic metal ions from wastewater

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H04179
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Reaction engineering/Process system
• Research Institution: Kyushu University
• Principal Investigator: Kishida Masahiro 九州大学, 工学研究院, 教授 (60243903)
• Co-Investigator(Kenkyū-buntansha): 松根 英樹 九州大学, 工学研究院, 助教 (10380586) ; 竹中 壮 九州大学, 工学(系)研究科(研究院), 准教授 (10302936)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 触媒化学プロセス / 排水浄化 / 亜ヒ酸 / 接触酸化 / セレン酸 / 接触還元 / 担持白金触媒

Outline of Final Research Achievements

Arsenite ions or selenate ions contained in the wastewater from metal refining factories are toxic and difficult to be eliminated by a general method. Those ions are usually removed after oxidizing arsenite to arsenate / reducing selenate to selenium metal, which are easily removed. However, the oxidation / reduction reaction are hard to progress under mild conditions. Recently we found that supported-platinum catalysts promoted significantly the arsenite oxidation. In this work, we examined the catalytic behavior for the arsenite oxidation and the selenate reduction in aqueous solution. As a result, we could optimize the catalyst support, platinum size, and reaction conditions. Furthermore, we discussed on the reaction mechanism of the arsenite oxidation by performing kinetics analysis in detail. Similarly, we clarified that the platinum catalyst was effective for the reduction of selenate with hydrazine.

Free Research Field

化学工学