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Clean Technologies and Environmental Policy

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18-05-2023 | Original Paper

Preparation of Pickering emulsion hydrogels containing indium(III) extractants and their indium(III) recycling properties

Authors: Chen Dong, Jing Gao, Yunting Zhao, Weiqin Zhao, Kegong Ning, Peng Wu, Yongjun He

Published in: Clean Technologies and Environmental Policy | Issue 9/2023

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Abstract

Extractant leakage has been a limiting factor in the recovery of metal ions from conventional emulsion gels in water. Pickering emulsion hydrogels (PEHGs) were prepared by oil-in-water Pickering emulsion polymerization with diacetone acrylamide and acrylamide as the continuous phase, indium(III) extractant (bis(2-ethylhexyl) phosphate) as the dispersed phase, and nano-silica (SiO₂) as the emulsifier. The Pickering emulsions were characterized by optical microscopy, and the PEHGs were characterized by infrared spectroscopy and scanning electron microscopy. The In(III) adsorption properties of the PEHGs were investigated. The results showed that the highest In(III) adsorption capacity of PEHGs reached 25.14 mg g⁻¹ at 25 °C. The adsorption amount of In(III) was consistent with the predicted value from the Langmuir isotherm model. After three cycles of adsorption and desorption, the In(III) adsorption rate remained at about 98% and there was no obvious oil phase leakage. These findings demonstrate that PEHGs have excellent encapsulation properties and show potential as a recyclable material for highly efficient removal of In(III). Additionally, PEHGs offered a new strategy for environmental management and economic development due to its green and convenient manufacturing.

Graphical abstract

Pickering emulsion hydrogels could be used for indium ion recovery as adsorption material with high encapsulation performance and stability.

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Title: Preparation of Pickering emulsion hydrogels containing indium(III) extractants and their indium(III) recycling properties
Authors: Chen Dong
Jing Gao
Yunting Zhao
Weiqin Zhao
Kegong Ning
Peng Wu
Yongjun He
Publication date: 18-05-2023
Publisher: Springer Berlin Heidelberg
Published in: Clean Technologies and Environmental Policy / Issue 9/2023
Print ISSN: 1618-954X
Electronic ISSN: 1618-9558
DOI: https://doi.org/10.1007/s10098-023-02545-9

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