A multifunctional self-crosslinked chitosan/cationic guar gum composite hydrogel and its versatile uses in phosphate-containing water treatment and energy storage. (15th September 2020)

• Record Type: Journal Article
• Authors: Dai, Lei; Wang, Yan; Li, Zixiu; Wang, Xiaowan; Duan, Chao; Zhao, Wei; Xiong, Chuanyin; Nie, Shuangxi; Xu, Yongjian; Ni, Yonghao
• Is Part Of: Carbohydrate polymers. Volume 244(2020)
• Publication Date: 2020-09-15
• Subjects: Hydrogel -- Chitosan -- Cationic guar gum -- Water treatment -- Supercapacitor; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2020.116472
• Languages: English
• ISSNs: 0144-8617

Abstract

Graphical abstract: Highlights: A versatile self-crosslinked all-polysaccharide hydrogel is prepared. The hydrogel possesses multi-functionalities. The hydrogel efficiently removes phosphate in wastewater. The phosphate-adsorbed hydrogel converts to a N, P-doped carbon material for supercapacitors. Abstract: A new self-crosslinked composite hydrogel is prepared with chitosan (CS) and cationic guar gum (CGG), based on the imine and acetal chemistry for gelation. The CS/CGG hydrogel exhibits thermal/pH responsiveness, injectability, adhesiveness and good compressive strength. The hydrogel is effective in removing phosphate from wastewater through an adsorption process, during which KH2 PO4 is used as a phosphate model. The adsorption complies with the Freundlich model, indicating that it is a multilayered process with complex adsorption mechanisms. Considering their porous structure and nitrogen/phosphorus heteroatoms doping, the phosphate-adsorbed hydrogels are made into porous N, P doped carbon aerogels that can be potentially used as electrodes for a supercapacitor. The results indicate that these carbon aerogels possess excellent capacitive performance (best specific capacitance of 302.2 ± 4.9 F/g), as well as good cycling stability after 5000 times of charging/discharging.