Facile preparation of hierarchical porous poly(vinyl amidoxime) membranes as efficient gallium adsorbents
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Facile preparation of hierarchical porous poly(vinyl amidoxime) membranes as efficient gallium adsorbents Ziyang Chen1 · Tuantuan Yang1 · Yang Chen1 · Mei Liang1 · Huawei Zou1 Received: 22 April 2020 / Revised: 26 August 2020 / Accepted: 7 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Gallium has important applications in new energy, semiconductor, and many other fields. Although a lot of work has been done in the field of preparing amidoxime resin to obtain gallium, there are still problems such as low adsorption capacity and relatively slow adsorption rate. In this paper, we report several high-performance porous amidoxime membranes (HPAOM). (Theoretical maximum adsorption capacity of gallium is 88.339 mg/g at 25 ºC, and the fastest adsorption equilibrium time is only 16.9 min which prepared by non-solvent-induced phase separation.) We studied the effect of pore structure on the adsorption properties of porous amidoxime membranes. The comparative analysis of the adsorption kinetics of the porous amidoxime membrane prepared by adding different contents of pore-forming agent PMMA and spray method shows that the surface through-hole structure is very important for the improvement in the adsorption rate. The amidoxime film prepared by spraying also showed good selective adsorption. It is also found that it has good adsorption performance in a wide temperature range via the analysis of adsorption isotherm curve of amidoxime porous membrane. It provides a new method for the preparation of gallium adsorption materials with large adsorption capacity, fast adsorption speed, good selective adsorption of Ga and V, and wide adsorption temperature range. Keywords Amidoxime membranes · Porous Gallium adsorption · Adsorption kinetics
Introduction As an important industrial raw material, gallium has high utilization value and potential in the fields of semiconductors [1], solar cells [2], photoelectric detection [3], medical [4], and other fields. However, because the cost of extracting gallium * Huawei Zou [email protected] 1
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
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alone is too high, gallium is mainly developed as a by-product of other minerals. At present, almost all primary gallium in the world is source In Bayer solution and Zn slag [5]. Among them, Bayer solution mainly obtains primary gallium (more than 90% of primary gallium comes from Bayer solution) [6]. Therefore, it is of great significance to find a material to extract gallium from Bayer solution. Bayer’s solution is a highly alkaline sodium aluminate solution obtained by dissolving bauxite using a strong alkaline NaOH solution under high temperature and pressure. The gallium concentration is generally 100–300 mg/L and the content is low. In order to extract gallium from it, some commonly used methods currently include staged precipitation [7], organic solvent extraction [8], electrochemical reduc
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