A graphene oxide modified cellulose nanocrystal/PNIPAAm IPN hydrogel for the adsorption of Congo red and methylene blue

A highly efficient strategy was developed to fabricate a graphene oxide modified cellulose nanocrystal/PNIPAAm IPN (GO-CNC/PNIPAAm IPN) hydrogel, which was capable of effectively adsorbing cationic and anionic dyes. The adsorption of Congo red (CR) and methylene blue (MB) was investigated based on t...

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Bibliographic Details
Published in:New journal of chemistry 2021-09, Vol.45 (36), p.16679-16688
Main Authors: Zhang, Lijuan, Zhao, Dongqing, Lu, Yao, Chen, Jinghan, Li, Haotian, Xie, Jinghan, Xu, Yue, Yuan, Haikuan, Liu, Xijian, Zhu, Xueyan, Lu, Jie
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Cellulose
Chemisorption
Dyes
Graphene
Hydrogels
Isotherms
Kinetics
Methylene blue
Nanocrystals
Service life
Wastewater treatment
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Summary:A highly efficient strategy was developed to fabricate a graphene oxide modified cellulose nanocrystal/PNIPAAm IPN (GO-CNC/PNIPAAm IPN) hydrogel, which was capable of effectively adsorbing cationic and anionic dyes. The adsorption of Congo red (CR) and methylene blue (MB) was investigated based on the effects of pH, adsorption isotherms, adsorption kinetics, and recycling experiments. The adsorption capacities for CR and MB of the GO-CNC/PNIPAAm IPN hydrogel adsorbent were 728.8 mg g −1 and 281.9 mg g −1 , respectively, and the difference is due to complex electrostatic and chemisorption effects between the adsorbent and the dye, which could be explained using the Langmuir isotherm adsorption model and pseudo-second-order kinetics model. In addition, the GO-CNC/PNIPAAm IPN hydrogel could be used repeatedly, and the adsorption capacities for CR and MB were 84.9% and 82.4% of the original hydrogel after five re-adsorption experiments, respectively. This type of adsorbent provided the advantages of being low-cost, having simple preparation, being non-polluting, and having good adsorption effects and a long service life, which is promising for its use in dye wastewater treatment in the future. A simple strategy is developed to fabricate a graphene oxide modified cellulose nanocrystal/PNIPAAm IPN (GO-CNC/PNIPAAm IPN) hydrogel. It is a high-efficiency and low-cost adsorbent for the removal the anionic dye CR and cationic dye MB.
ISSN:1144-0546
1369-9261
DOI:10.1039/d1nj01969d