Abstract
During the last decade, hydrogels have been used as potential adsorbents for removal of contaminants from aqueous solution. To improve the adsorption efficiency, there are numerous different particles that can be chosen to encapsulate into hydrogels and each particle has their respective advantages. Depending on the type of pollutants and approaching method, the particles will be used to prepare hydrogels. The hydrogels commonly applied in water/wastewater treatment was mainly classified into three classes according to their shape included hydrogel beads, hydrogel films, and hydrogel nanocomposites. In review of many recently research papers, we take a closer look at hydrogels and their applications for removal of contaminants, such as heavy metal ion, dyes, and radionuclides from water/wastewater in order to elucidate the reactions between contaminants and particles and potential for recycling and regeneration of the post-treatment hydrogels.
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Funding
This research was supported by a grant from R&D Program of the Korea Railroad Research Institute (KRRI) and by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2017R1D1A1A09000642) and by the Korean Ministry of Environment’s GAIA project (2015000550006).
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Highlights
• Unique particles entrapped in synthesis process of three types of hydrogels
• Adsorption kinetic models, adsorption isotherm models, and the mechanism of contaminants on hydrogels
• Impact factors on the adsorption capacity of hydrogels: pH, adsorbate concentration, swelling degree, and other ions
• Recycle and recovery methods of used hydrogels and effect of mechanical properties on the reusability of hydrogels
• Applications of hydrogels on removal of metal ion, dye, and radionuclides from water/wastewater
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Van Tran, V., Park, D. & Lee, YC. Hydrogel applications for adsorption of contaminants in water and wastewater treatment. Environ Sci Pollut Res 25, 24569–24599 (2018). https://doi.org/10.1007/s11356-018-2605-y
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DOI: https://doi.org/10.1007/s11356-018-2605-y