Extraction of arsenic from a soil in the blackfoot disease endemic area with ionic liquids

Chang Yu Liao, Ching Yu Peng, Hong Chung Wang, Hsu Ya Kang, H. Paul Wang

研究成果: Article同行評審

6 引文 斯高帕斯(Scopus)

摘要

Speciation of arsenic extracted with room temperature ionic liquids (RTILs) ([bmim][BF4] (1-butyl-3-methylimidazolium tetrafluoroborate) and [bmim][PF6] (1-butyl-3-methylimidazolium hexafluorophosphate)) from an As-humic acid (As-HA) complex contaminated soil (As-HA/soil) in a blackfoot disease endemic area has been studied by X-ray absorption (near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS)) spectroscopy. About 45% of arsenic in the As-HA/soil can be extracted with [bmim][BF 4] while the relatively less hydrophilic [bmim][PF6] extracts 25% of arsenic. The extracted arsenic in the [bmim][BF4] and [bmim][PF6] from the As-HA/soil possesses mainly As(III) species, suggesting that at least two reaction paths may be involved in the extraction process: (1) splitting of As-HA and (2) reduction of As(V) to As(III). The refined EXAFS spectra also indicate that the As(III) extracted in the RTILs possesses the AsO2- structure, which has the AsO bond distances of 1.771.79 Å and coordination numbers of 4.04.2.

All Science Journal Classification (ASJC) codes

  • 核能與高能物理
  • 儀器

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