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Preparation of two-component Pickering emulsion hydrogels for the removal of zinc ions from aqueous solutions
- Source :
- Water Science and Technology, Vol 87, Iss 2, Pp 454-468 (2023)
- Publication Year :
- 2023
- Publisher :
- IWA Publishing, 2023.
-
Abstract
- Traditional liquid-solid extraction methods for the removal of zinc ions (Zn(II)) were generally limited by the leakage of extractant and low extraction capacity. The two-component Pickering emulsion hydrogels (PEHGs) in which the synergistic 2-ethylhexyl hydrogen-2-ethylhexylphosphate/tributyl phosphate (EHEHPA/TBP) was encapsulated in a semi-penetrating polymer network (SIPN) structured hydrogels polyacrylamide/sodium alginate (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 PEHGs on Zn(II) was investigated. The results showed that the encapsulation of the extractant reached 95% due to the hydrogels network and nano-silica (nano-SiO2) particle network in PEHGs-15. The critical crashing pressure of PEHGs-15 was 0.084 MPa, and the adsorption after 3 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. The functional groups of SA and EHEHPA/TBP enhanced the adsorption capacity of PEHGs-15 by chelating with Zn(II). After five adsorption-desorption cycles, the adsorption capacity of PEHGs-15 exceeded 85% of the initial one. The excellent mechanical properties, self-healing, and regenerative properties of PEHGs-15 offer the potential to remove Zn(II) from the solution. HIGHLIGHTS The two-component PEHGs based on Pickering emulsions were prepared to remove Zn(II) from the solution.; The introduction of SA and nano-SiO2 resulted in 95% encapsulation of extractants in PEHGs.; The synergistic extractant EHEHPA/TBP and PAM/SA in PEHGs-15 exhibited a high adsorption capacity of 76.51 mg/g for Zn(II).; After five adsorption-desorption cycles, the adsorption capacity of PEHGs-15 exceeded 85% of the initial one.;
Details
- Language :
- English
- ISSN :
- 02731223 and 19969732
- Volume :
- 87
- Issue :
- 2
- Database :
- Directory of Open Access Journals
- Journal :
- Water Science and Technology
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.957ad446fbc8434db4196b66bc132420
- Document Type :
- article
- Full Text :
- https://doi.org/10.2166/wst.2022.430