Construction of chitosan/polyacrylate/graphene oxide composite physical hydrogel by semi-dissolution/acidification/sol-gel transition method and its simultaneous cationic and anionic dye adsorption properties

Zhitao Chang; Yijun Chen; Shuxian Tang; Jueying Yang; Yu Chen; Shusen Chen; Puwang Li; Ziming Yang

doi:10.1016/j.carbpol.2019.115431

Construction of chitosan/polyacrylate/graphene oxide composite physical hydrogel by semi-dissolution/acidification/sol-gel transition method and its simultaneous cationic and anionic dye adsorption properties

Carbohydr Polym. 2020 Feb 1:229:115431. doi: 10.1016/j.carbpol.2019.115431. Epub 2019 Nov 22.

Authors

Zhitao Chang¹, Yijun Chen¹, Shuxian Tang¹, Jueying Yang¹, Yu Chen², Shusen Chen¹, Puwang Li³, Ziming Yang³

Affiliations

¹ School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, PR China.
² School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, PR China. Electronic address: cylsy@163.com.
³ Agriculture Products Processing Research Institute, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang, 524001, PR China.

PMID: 31826491
DOI: 10.1016/j.carbpol.2019.115431

Abstract

In the current study, a novel CTS/PAA/GO composite polyampholyte physical hydrogel was prepared by the SD-A-SGT method to achieve desired adsorption properties for printing and dyeing wastewater treatment. The hydrogels exhibited controllable and stable structure. The linear PAA significantly improved the swelling and adsorption properties of the hydrogel, and the composition of GO enhanced its mechanical and adsorption properties. The batch adsorption experiments revealed the ability to simultaneously absorb the cationic model dye, MB, and anionic model dye, FY3, with the similar equilibrium adsorption capacities of 296.5±31.7 mg·g^-1 and 280.3±23.9 mg·g^-1, respectively. The factors affecting the dye adsorption performance, including the hydrogel composition, initial dye concentration and dye solution pH, were investigated. The dye adsorption kinetics was studied and the adsorption mechanisms were proposed. The unique structure and properties of the hydrogel make it a great candidate adsorbent for wastewater treatments.

Keywords: Mechanical property; Polyampholyte physical hydrogel; Simultaneous adsorption; Swelling property; Wastewater treatment.