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Liu Y, Xin Z, Tian L, Villa-Gomez D, Wang W, Cao Y. Fabrication of peptide-encapsulated sodium alginate hydrogel for selective gallium adsorption. Int J Biol Macromol 2024; 263:130436. [PMID: 38408578 DOI: 10.1016/j.ijbiomac.2024.130436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Revised: 02/22/2024] [Accepted: 02/23/2024] [Indexed: 02/28/2024]
Abstract
Peptides are recognized as promising adsorbents in metal selective recovery. In this study, the designed gallium-binding peptide H6GaBP was immobilized by the polysaccharide polymer sodium alginate (SA) for gallium recovery. The synthesized H6GaBP@SA microspheres exhibited a maximum adsorption capacity of 127.4 mg/g and demonstrated high selectivity for gallium at lower pH values. The adsorption process aligned well with the pseudo-second-order equation and Langmuir model. To elucidate the adsorption mechanism, a comprehensive characterization including molecular docking, scanning electron microscope coupled with energy-dispersive X-ray spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and thermogravimetry analysis (TGA), were conducted. These analyses revealed that gallium ions were initially adsorbed through electrostatic interaction by H6GaBP@SA, followed by a cation exchange reaction between Ga(OH)2+ and Ca2+, as well as coordination between gallium and histidine residues on the peptide. Moreover, the H6GaBP@SA exhibited improved thermal stability compared to sole sodium alginate microspheres, and the coordination of gallium with peptides can also defer the decomposition rate of the adsorbents. Compared to other adsorbents, the peptide-encapsulated hydrogel microspheres exhibited superior gallium selectivity and improved adsorption capacity, offering an environmentally friendly option for gallium recovery.
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Affiliation(s)
- Yun Liu
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, Henan 450001, China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China; The Key Lab of Critical Metals Minerals Supernormal Enrichment and Extraction, Ministry of Education, Zhengzhou, Henan 450001, China
| | - Zhiwei Xin
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Lei Tian
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Denys Villa-Gomez
- School of Civil Engineering, The University of Queensland, 4072 QLD, Australia; Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, 4072 QLD, Australia
| | - Wei Wang
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, Henan 450001, China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China; The Key Lab of Critical Metals Minerals Supernormal Enrichment and Extraction, Ministry of Education, Zhengzhou, Henan 450001, China.
| | - Yijun Cao
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, Henan 450001, China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China; The Key Lab of Critical Metals Minerals Supernormal Enrichment and Extraction, Ministry of Education, Zhengzhou, Henan 450001, China.
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