Bioleaching of gallium from gallium arsenide by Cellulosimicrobium funkei and its application to semiconductor/electronic wastes

Sirikan Maneesuwannarat, Alisa S. Vangnai, Mitsuo Yamashita, Paitip Thiravetyan

研究成果: Article査読

18 被引用数 (Scopus)

抄録

The aim of this work was to screen and characterize heterotrophic bacteria for gallium arsenide (GaAs) leaching. Ga in the form of GaAs has been extensively used as a semiconductor substrate material. The advantage of using microbes for gallium recovery is the fact that this method is a safer, environment-friendly and includes energy-saving processes, which can leach metals at relatively low concentrations. Eight bacterial isolates were isolated from cadmium-, and arsenic-contaminated soil in the presence of GaAs. Pad I and NKS III showed the highest efficiency in Ga leaching at approximately 63-81% after 15 and 30 days, respectively. The analysis of 16S rDNA sequences indicated that strain Pad I was close to strain NKS III; it was characterized and identified as Cellulosimicrobium funkei (C. funkei). Further investigation revealed that the ability of Ga leaching from GaAs by this bacterium involved amino acids. This process occurred in a weak base pH range. The results show a potential application of C. funkei to leach Ga from semiconductors or electronic wastes. The in-depth mechanism of bacterial leaching of Ga from GaAs was also investigated.

本文言語English
ページ(範囲)80-87
ページ数8
ジャーナルProcess Safety and Environmental Protection
99
DOI
出版ステータスPublished - 2016 1 1

ASJC Scopus subject areas

  • 環境工学
  • 環境化学
  • 化学工学(全般)
  • 安全性、リスク、信頼性、品質管理

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