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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The data that support the findings of this study are available from the corresponding author, upon reasonable request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 50572088).
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This work was supported by the National Natural Science Foundation of China (No. 50572088).
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CD contributed to methodology, writing—original draft, and data curation. JG and YZ contributed to visualization and investigation. WZ contributed to software and funding acquisition. KN contributed to resources and formal analysis. PW contributed to formal analysis and validation. YH contributed to conceptualization, methodology, writing—review & editing, and project administration.
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Dong, C., Gao, J., Zhao, Y. et al. Preparation of Pickering emulsion hydrogels containing indium(III) extractants and their indium(III) recycling properties. Clean Techn Environ Policy 25, 2987–2997 (2023). https://doi.org/10.1007/s10098-023-02545-9
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DOI: https://doi.org/10.1007/s10098-023-02545-9