期刊
CARBOHYDRATE POLYMERS
卷 244, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116472
关键词
Hydrogel; Chitosan; Cationic guar gum; Water treatment; Supercapacitor
资金
- National Natural Science Foundation of China [31901265]
- Natural Science Foundation of Shaanxi Province [2019JQ-784]
- China Postdoctoral Science Foundation [2019M662061]
- Opening Project of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control
- High-level Foreign Experts Project [GDT20186100425]
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 KH2PO4 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.
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