Wastewater treatment of plating solution and fertilizer production process using the oxidation properties of metal oxides

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K21866
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 64:Environmental conservation measure and related fields
• Research Institution: Kyushu University
• Principal Investigator: Einaga Hisahiro 九州大学, 総合理工学研究院, 教授 (90356593)
• Project Period (FY): 2020-07-30 – 2022-03-31
• Keywords: 酸化銅 / 亜鉛 / 酸化還元特性 / リン / 再資源化

Outline of Final Research Achievements

In this study, copper-based oxide catalysts with high redox properties were developed for the development of phosphorus resource recovery from phosphorus-containing waste liquids discharged from electroless plating processes. Cu-Al and Cu-Zn-Al oxide materials were prepared by a liquid phase precipitation method using sodium carbonate as a precipitant, and the redox properties of each catalyst material were compared by the oxygen pulse method and the temperature rise hydrogen reduction method. It was found that the addition of alumina increases the surface area of the catalysts and the copper oxides are highly dispersed on alumina, and that the addition of zinc to these materials increases the particle size of copper oxide on alumina and changes the redox properties. The use of tetramethylammonium hydroxide as a precipitant was found to improve the redox properties and dramatically increase the amount of oxygen adsorbed.

Free Research Field

触媒化学

Academic Significance and Societal Importance of the Research Achievements

リン化合物は化学工業から農業用肥料まで幅広く使用される汎用製品であるが、枯渇性の資源である。一方、化学工業プロセスから排出されるリンは環境中に排出されると海水の汚染につながるため、排水処理方法の高度化が求められている。本研究では、無電解ニッケルめっき工程におけるリンを含む化合物を温和な条件で酸化し、回収する方法の開発の一環として、酸化還元特性の高い酸化銅系触媒材料を得ることができた。