Recent review for removal of toxic metal ions by polymeric hydrogels

Subject Areas : The Application of Chemistry in Environment

Mehrab  Fallahi-Samberan ¹ (Department Of Chemical Engineering)
Sameneh  Khodadadi ² (Department of Chemical Engineering, Ahar Branch, Islamic Azad University, Ahar, Iran)

Received: 2022-10-10 Accepted : 2022-10-12 Published : 2021-09-23

Keywords: Adsorbents, Hydrogels, toxic metal ions, sorption capacity,

Abstract :

A continuous research is going to synthesize the novel adsorbents for removal of toxic metal ions having high sorption capacity along with non-toxic and biodegradable nature. Ionic impurities have been removed in many ways. Ionic impurities have been removed in many ways. However, hydrogels with high sorption capacity, high functionality, hydrophilicity, regeneration and nontoxicity have made them a good contender for the removal of various aquatic pollutants, including heavy metal ions. Hydrogels have physically well-defined three dimensional porous structures and have chemically responsive functional groups, which enable them to readily capture metal ions and dyes from wastewater and to release these toxic pollutants upon changes in aqueous solution conditions. The hydrophilic character of hydrogel adsorbents enables to form a flexible network of polymer chains, which allow solutes to quickly penetrate into the network with water and to form stable complexes with functional groups. They are three dimensional hydrophilic polymers that absorb large amounts of water, swell to form a solid gel while maintaining their physical structure without dissolving. The present review provides recent progress in the synthesis of the hydrogels for waste water treatment and insight into increase in selectivity, efficiency and reusability of hydrogels.