SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2024, Vol. 66 ›› Issue (2): 110-118.DOI: 10.1016/j.cjche.2023.09.005

• Full Length Article • 上一篇    下一篇

Upper-rim-modified thioether thiacalix[4]arene used for liquid–liquid extraction of Au(Ⅲ) and Pd(Ⅱ) in hydrochloric acid medium

Sheng Wan, Rong Xie, Jianhong Fan, Kewen Tang   

  1. Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
  • 收稿日期:2023-06-02 修回日期:2023-09-15 出版日期:2024-02-28 发布日期:2024-04-20
  • 通讯作者: Rong Xie,E-mail:rongxie678@sina.com;Kewen Tang,E-mail:tangkewen@hnist.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (U20A20268), Natural Science Foundation of Hunan Province (2020JJ1004) and Hunan Provincial Innovation Foundation for Postgraduate (CX20211190).

Upper-rim-modified thioether thiacalix[4]arene used for liquid–liquid extraction of Au(Ⅲ) and Pd(Ⅱ) in hydrochloric acid medium

Sheng Wan, Rong Xie, Jianhong Fan, Kewen Tang   

  1. Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
  • Received:2023-06-02 Revised:2023-09-15 Online:2024-02-28 Published:2024-04-20
  • Contact: Rong Xie,E-mail:rongxie678@sina.com;Kewen Tang,E-mail:tangkewen@hnist.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (U20A20268), Natural Science Foundation of Hunan Province (2020JJ1004) and Hunan Provincial Innovation Foundation for Postgraduate (CX20211190).

摘要: Gold (Au) and palladium (Pd) play an increasing role in the production and human life; Therefore, it is of great significance to study their recovery. A 5,11,17,23-tetra-ethylthio-25,26,27,28-tetra-hydroxyl thiacalix[4]arene (TCAET) was synthesized specifically for the capture of Au(Ⅲ) and Pd(Ⅱ) from HCl medium by liquid–liquid extraction. In a 0.1 mol·L-1 HCl medium, the transfer of Au(Ⅲ) and Pd(Ⅱ) from the aqueous phase to the organic phase was highly efficient, with a transfer ratio of 100% for Au(Ⅲ) and 98% for Pd(Ⅱ). Furthermore, the extraction equilibrium time for Au(Ⅲ) was just 5min. Job’s method data demonstrated that TCAET formed complexes with Au(III) and Pd(II) in a ratio of 2:3 and 1:1, respectively, during the extraction process. TCAET showed high selectivity toward Pd(II) and Au(III) over other competing metal ions. Moreover, both Au(Ⅲ) and Pd(II) could be successfully stripped from the loaded organic phases with a 1.0 mol·L-1 thiourea in 0.5mol·L-1 HCl and 0.5mol·L-1 thiourea in 0.5mol·L-1 HCl, respectively. Results obtained from five consecutive extraction-stripping cycles showed good reusability of TCAET toward Au(Ⅲ) and Pd(Ⅱ) recovery. The conclusion can provide a certain reference for thiacalixarene in the recovery of precious metal species.

关键词: Thiacalix[4]arene, Upper-rim modification, Liquid–liquid extraction, Precious metal, Thioether

Abstract: Gold (Au) and palladium (Pd) play an increasing role in the production and human life; Therefore, it is of great significance to study their recovery. A 5,11,17,23-tetra-ethylthio-25,26,27,28-tetra-hydroxyl thiacalix[4]arene (TCAET) was synthesized specifically for the capture of Au(Ⅲ) and Pd(Ⅱ) from HCl medium by liquid–liquid extraction. In a 0.1 mol·L-1 HCl medium, the transfer of Au(Ⅲ) and Pd(Ⅱ) from the aqueous phase to the organic phase was highly efficient, with a transfer ratio of 100% for Au(Ⅲ) and 98% for Pd(Ⅱ). Furthermore, the extraction equilibrium time for Au(Ⅲ) was just 5min. Job’s method data demonstrated that TCAET formed complexes with Au(III) and Pd(II) in a ratio of 2:3 and 1:1, respectively, during the extraction process. TCAET showed high selectivity toward Pd(II) and Au(III) over other competing metal ions. Moreover, both Au(Ⅲ) and Pd(II) could be successfully stripped from the loaded organic phases with a 1.0 mol·L-1 thiourea in 0.5mol·L-1 HCl and 0.5mol·L-1 thiourea in 0.5mol·L-1 HCl, respectively. Results obtained from five consecutive extraction-stripping cycles showed good reusability of TCAET toward Au(Ⅲ) and Pd(Ⅱ) recovery. The conclusion can provide a certain reference for thiacalixarene in the recovery of precious metal species.

Key words: Thiacalix[4]arene, Upper-rim modification, Liquid–liquid extraction, Precious metal, Thioether