Removal of arsenic from sulfuric acidic solution using ultrasound oxidation and goethite

2015 Fiscal Year Final Research Report

• Project/Area Number: 24561002
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Earth system and resources enginnering
• Research Institution: Akita University
• Principal Investigator: Okawa Hirokazu 秋田大学, 工学(系)研究科(研究院), 講師 (00375221)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 砒素 / 鉱山排水 / 超音波 / ゲーサイト / 酸化

Outline of Final Research Achievements

Goethite was successfully synthesized from the iron-containing sulfuric acid solution or acid mine drainage (AMD) of the Matsuo abandoned mine using an autoclave apparatus at 0.15 MPa and 121 °C for 2 h. At pH 2.2, ultrasound irradiation (200 kHz) for 60 min was employed to oxidize As(III) to As(V) in various atmospheres for an As(III) concentration of 10 ppm. The oxidation ratio of As(III) to As(V) is quite high (90%) at pH 2.2 in ambient atmosphere. The ratio is close to those obtained for Ar (95%) and O2 (96%) atmospheres. This may be due to the high concentration of H+ in the solution. Finally, the removal of As(III) using ultrasound irradiation and goethite simultaneously was investigated. The removal ratio reached 95% after 60 min of irradiation. The dependence of As removal ratio on irradiation time is similar to that of the As(III) oxidation ratio. Goethite is thus a promising material for As adsorption using ultrasound oxidation in acidic conditions and ambient atmosphere.

Free Research Field

資源生産環境学