Poly(ionic liquid)Hydrogel for Cr(Ⅵ)Removal from Neutral Water
With the development of economy,water pollution has become a pressing issue of global concern.Among them,Cr(Ⅵ)is highly soluble and toxic in wastewater,which can cause serious diseases.Due to pH of most contaminated surface water and groundwater is generally near neutral,the development of adsorbents with effective removal of Cr(Ⅵ)at near-neutral pH is crucial to the ecosystem and public health.In this paper,triazolium poly(ionic liquid)hydrogels with different structures were designed,prepared and applied to the adsorption and release of CrO42-.The hydrogels could achieve 100％removal of CrO42-from water under neutral conditions with a maximum adsorption capacity of 356 mg/g.Isothermal adsorption results show that CrO42-is adsorbed as a monolayer in the hydrogels at lower concentrations.In addition,the CrO42-adsorbed in the hydrogels could be further released by ion exchange to achieve regeneration of the adsorbent.
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