Study on the adsorption property for Cu2+ of Chitosan/Ploy (SSS- HEMA-AA) hydrogel

Abstract

Chitosan hydrogel, as a new type of macromolecule adsorbent material, has dual advantages of gel and various functional groups. It is easy to introduce functional groups which can chelate with heavy metal ions or electrostatic adsorption. It has large specific surface area and fast adsorption rate for heavy metal ions. It has quickly become a research hotspot in separation field. Based on this, the hydrogels of different components were prepared by integrating different proportions of copolymer monomers into chitosan hydrogels. The hydrogels of the same components were separately taken from aqueous solutions with different concentrations of Cu2+ for adsorption experiments. The heavy metal Cu2+ could be adsorbed and captured by a large number of functional groups such as sulfonic group, hydroxyl group, carboxyl group and amino group in the chemical structure. The effect of the same component on the hydrogel properties was also investigated. The molecular structure and internal morphology of the hydrogel and the effect of the amount of sodium styrene sulfonate (SSS) on the adsorption capacity of Cu2+ and the amount of glutaraldehyde on the water swelling rate were also investigated. The results show that the chitosan-P (SSS-HEMA-AA) hydrogel has a three-dimensional cross-linked network structure and has a high adsorption and removal efficiency for Cu2+. Its adsorption capacity for Cu2+ increases with the increase of the amount of sodium styrene sulfonate (SSS) in the preparation process, and the water absorption and swelling rate decreases with the increase of the amount of glutaraldehyde.