Citation: WANG Yue-Jiao, ZHU Long, GAO Jing, SHAN Wei-Jun, LOU Zhen-Ning, XIONG Ying. Adsorption of Gallium on Three-dimensional Gallnut Tannin/Ordered Mesoporous Silica Composites[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(1): 113-120. doi: 10.19756/j.issn.0253-3820.191535 shu

Adsorption of Gallium on Three-dimensional Gallnut Tannin/Ordered Mesoporous Silica Composites

College of Chemistry, Key Laboratory of Rare and Scattered Element, Liaoning University, Shenyang 110036, China

Received Date: 3 September 2019
Revised Date: 7 November 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 51674131, 21373005), the Natural Science Foundation of Liaoning Province of China (No.2019-MS-156), and the Natural Science Foundation of Liaoning University (Nos. LDGY2019009, LDGY2019014).

A three-dimensional gallnut tannin/ordered mesoporous silica composite 1.2-PT-10-KIT-6 was prepared by one-step method with tetraethyl orthosilicate as silicon source, gallnut tannin as adsorption source and glutaraldehyde as crosslinking agent. Transmission electron microscopy, small angle X-ray diffraction, N₂ adsorption and Fourier transform infrared spectroscopy were used to characterize the materials. All the materials had a three-dimensional cubic structure similar to KIT-6. The maximum adsorption capacity of gallium reached 186.73 mg/g at pH 10, which conformed to Langmuir monolayer adsorption, and the correlation coefficient R² was 0.99. In the binary system of Ga/Ge and Ga/As, the selectivity factor was more than 1.5, which could realize the selective separation of gallium. The adsorption mechanism was ion exchange between phenolic hydroxyl group and Ga(OH)₄^- and the O atom on phenolic hydroxyl group chelated with Ga(OH)₄^- to form a chelate. After six regeneration cycles, the recovery was over 95%.
- Mesoporous silica,
- Gallnut tannin,
- Composite,
- Gallium,
- Adsorption and separation
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