Preparation of two-component Pickering emulsion hydrogels for the removal of zinc ions from aqueous solutions

被引:1
|
作者
Gao, Jing [1 ]
Dong, Chen [1 ]
Zhao, Yunting [1 ]
Ma, Tian [1 ]
He, Yongjun [1 ]
机构
[1] Xian Univ Sci & Technol, Dept Chem & Chem Engn, 58 Yanta Middle Rd, Xian, Peoples R China
基金
中国国家自然科学基金;
关键词
2-ethylhexyl hydrogen-2-ethylhexylphosphate; tributyl phosphate; adsorption; pickering emulsion hydrogels; polyacrylamide; sodium alginate; removal; zinc ions; ADSORPTION;
D O I
10.2166/wst.2022.430
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Traditional liquid-solid extraction methods for the removal of zinc ions (Zn(II)) were generally limited by the leakage of extractant and lowextraction capacity. The two-component Pickering emulsion hydrogels (PEHGs) in which the synergistic 2-ethylhexyl hydrogen-2-ethylhexyl-phosphate/tributyl phosphate (EHEHPA/TBP) was encapsulated in a semi-penetrating polymer network (SIPN) structured hydrogelspolyacrylamide/sodium (PAM/SA) were prepared by the Pickering emulsions polymerization route. The PEHGs were characterized by FTIR,SEM, TGA, and tensile mechanical measurements, and their self-healing properties were explored. The adsorption performance of PEHGson Zn(II) was investigated. The results showed that the encapsulation of the extractant reached 95% due to the hydrogels network andnano-silica (nano-SiO2) particle network in PEHGs-15. The critical crashing pressure of PEHGs-15 was 0.084 MPa, and the adsorption after3 h of healing was only 86% of the original amount. The maximum adsorption capacity of PEHGs-15 on Zn(II) was 76.51 mg/g at pH 5. Thefunctional groups of SA and EHEHPA/TBP enhanced the adsorption capacity of PEHGs-15 by chelating with Zn(II). Afterfive adsorption-des-orption cycles, the adsorption capacity of PEHGs-15 exceeded 85% of the initial one. The excellent mechanical properties, self-healing, andregenerative properties of PEHGs-15 offer the potential to remove Zn(II) from the solution.
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页码:454 / 468
页数:15
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