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Iranian Polymer Journal

, Volume 27, Issue 8, pp 589–597 | Cite as

Cross-linked polyvinyl amidoxime fiber: a highly selective and recyclable adsorbent of gallium from Bayer liquor

  • Tuantuan Yang
  • Lixue Wang
  • Mei Liang
  • Yang Chen
  • Huawei Zou
Original Research
  • 72 Downloads

Abstract

Gallium, a scarce metal produced mainly from Bayer liquor, is widely used in semiconductors. Ion-exchange method is currently considered as the most effective method to recover gallium from Bayer liquor. In this article, fibrous amidoxime adsorbents are introduced to recover gallium from Bayer liquor. In addition, hydrazine cross-linked polyvinyl amidoxime (HPAO) fibers have been prepared. The structure of the as-prepared fibers was ascertained by FTIR, elemental analysis and weight gain rate. The adsorption kinetics, adsorption isotherm and recycling performance were investigated by batch method. Cross-linking duration was studied and it turned out to be an important factor to optimize the adsorption capacity and recycling performance. After 1.5 h cross-linking time, the fiber showed the highest gallium adsorption capacity of 14.83 mg/g in Bayer liquor. After 3 h cross-linking time, the fiber showed the best recycling performance, which retained 82.9% of the initial adsorption ability after four cycles. Adsorption capacity of vanadium was lower than 1 mg/g for all samples. HPAO displayed very fast adsorption kinetics with an equilibrium at 60 min. The EDS results confirmed the low extraction of aluminum and vanadium provided by HPAO fibers. The gallium-loaded fiber could be effectively eluted by acidified thiourea. With proper control of the cross-linking duration by hydrazine, HPAO fiber with high selectivity towards gallium, high adsorption capacity and good recycle performance could be obtained, which is promising for recovering gallium needed for industrial applications.

Keywords

Amidoxime Chelating fiber Gallium recovery Bayer liquor Kinetics 

Supplementary material

13726_2018_635_MOESM1_ESM.docx (990 kb)
Supplementary material 1 (DOCX 989 KB)

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Copyright information

© Iran Polymer and Petrochemical Institute 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Polymer Materials EngineeringPolymer Research Institute of Sichuan UniversityChengduChina

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