4.7 Article

Preparation of carboxymethyl cellulose/graphene composite aerogel beads and their adsorption for methylene blue

Journal

INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 202, Issue -, Pages 632-643

Publisher

ELSEVIER
DOI: 10.1016/j.ijbiomac.2022.01.052

Keywords

Graphene; Carboxymethyl cellulose; Aerogel beads; Ambient pressure drying; Adsorption

Funding

  1. National Natural Science Foundation of China [22078366]

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Carboxymethyl cellulose/graphene composite aerogel beads were prepared by a scalable method and their properties were characterized. The adsorption mechanism of the beads on methylene blue was found to be mainly through electrostatic interaction, and they exhibited good recyclability.
Carboxymethyl cellulose/graphene composite aerogel beads (CMC/GAs) were prepared by the easily scaling-up method, i.e., wet spinning-environmental pressure drying method. The influences of the type and concentration of coagulating bath on the formation of aerogel beads were discussed, and the forming mechanism was analyzed. The CMC/GAs was characterized through SEM, XRD, FI-IR, Raman, XPS, electronic universal testing machine and other methods. The CMC/GAs-30 has an average particle size and a mean pore diameter of 3.83 mm and 82 mu m, respectively. The analysis results indicated that the adsorption mechanisms of CMC/GAs on methylene blue (MB) are mainly through the electrostatic interaction. The adsorption process conforms to the Langmuir model (R-2 = 0.9964) and pseudo-second-order kinetic model (R-2 is higher than 0.99). When the particle size of CMC/GAs-30 decreases, the equilibrium adsorption capacity for MB increases. Under the experimental conditions explored, the Langmuir maximum adsorption capacity of CMC/GAs-30 for MB is 222.72 mg.g(-1). The CMC/GAs-30 show good recycle performance in MB adsorption. The removal rate of MB from water by CMC/GAs-30 remained at about 90% after 30-times adsorption-regeneration cycles.

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