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Researches on Hydrogel Based on Environmental Minerals

Environmental minerals, such as bentonite, kaolin, talc, attapulgite and diatomite, have abundant micropores and surface active groups. Preparation of hydrogels based on the minerals have been drawing more and more attentions worldwide because of improved salt resistance, water absorption rate, gel strength, thermal stability, water holding capacity due to addition of the minerals. Current investigations mainly focus on water absorption performance of hydrogels, insufficient concerns about porous structure, cohesiveness, surface electrical characteristics, corrosion resistance and thermal stability were paid. Novel preparation techniques with aid of ultrasonic treatment and microwave irradiation, enhancing in-situ grafting and copolymerization of biomass cellulose in mineral structures, as well as further researches on absorption mechanism of environmental mineral based hydrogels are becoming meaningful trends.