Oxidation of Phosphite in Acidic Solutions with Dissolved Oxygen under UV Irradiation

• MITUNO Junji

  Toyama National College of Technology

• SANUKI Sumiko

  Faculty of Engineering, Toyama University

• IWAI Masao

  Toyama National College of Technology

Bibliographic Information

Other Title

• 紫外線照射下における亜リン酸水溶液の溶存酸素による酸化反応
• シガイセン ショウシャカ ニ オケル アリンサン スイヨウエキ ノ ヨウゾン サンソ ニ ヨル サンカ ハンノウ

Abstract

The oxidation of phosphite in acidic solutions with dissolved oxygen under UV irradiation was investigated. The oxidation rate of phosphite obeys 1/2-order for phosphite and p_O<SUB>2</SUB>, first-order for UV intensity. The pH of the solutions controls the concentration of the main reacting species, H₂PO₃^-. A activation energy was found to be 41.3kJ• mol^-1 , suggesting that the overall reaction rate was controlled by a chemical reaction.<BR>Furthermore, the applicability of the oxidation reaction of phosphite to the treatment of spent electroless plating solutions was studied using artificial electroless plating solutions. Oxidation above 80% was readily achieved within 120 minutes at 333K and 1 atm oxygen partial pressure. From the findings of this study, we can expect to use the oxidation reaction step of phosphite as part of the flowsheet of spent electroless plating liquor treatment.

Journal

• Journal of MMIJ

  Journal of MMIJ 124 (9), 589-593, 2008

  The Mining and Materials Processing Institute of Japan

Keywords

• Electroless Nickel Plating
• Phosphite
• UV Irradiation
• Oxidation

Details

• CRID: 1390282680250370304
• NII Article ID: 10021999147
• NII Book ID: AA12188381
• DOI: 10.2473/journalofmmij.124.589
• COI: 1:CAS:528:DC%2BD1cXhtFygsbvP
• ISSN: 18840450
• ISSN: 18816118
• NDL BIB ID: 9664972
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9664972
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed