title: A 1-dodecanethiol-based phase transfer protocol for the highly efficient extraction of noble metal ions from aqueous phase.
abstract: A 1-dodecanethiol-based phase-transfer protocol is developed for the extraction of noble metal ions from aqueous solution to a hydrocarbon phase, which calls for first mixing the aqueous metal ion solution with an ethanolic solution of 1-dodecanethiol, and then extracting the coordination compounds formed between noble metal ions and 1-dodecanethiol into a non-polar organic solvent. A number of characterization techniques, including inductively coupled plasma atomic emission spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis demonstrate that this protocol could be applied to extract a wide variety of noble metal ions from water to dichloromethane with an efficiency of >96%, and has high selectivity for the separation of the noble metal ions from other transition metals. It is therefore an attractive alternative for the extraction of noble metals from water, soil, or waste printed circuit boards.
authors.affiliation: State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: chendong@ipe.ac.cn.
authors.forename: Dong
authors.initials: D
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Penglei
authors.initials: P
authors.lastname: Cui
authors.affiliation: Research Centre for Process Pollution Control, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: hbcao@ipe.ac.cn.
authors.forename: Hongbin
authors.initials: H
authors.lastname: Cao
authors.affiliation: State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: jyang@ipe.ac.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
mesh_terms: D059625:Liquid-Liquid Extraction / Q000379:methods*; D008670:Metals / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D008670:Metals; D013438:Sulfhydryl Compounds; D014874:Water Pollutants, Chemical; D014867:Water; C013976:dodecylmercaptan
keywords: 1-Dodecanethiol; Efficiency; Extraction; Noble metal ion; Phase transfer