Hydrothermal Synthesis of Ultra-Light Coal-Based Graphene Oxide Aerogel for Efficient Removal of Dyes from Aqueous Solutions

Nanomaterials
You LvYijun Cao

Abstract

A novel carboxymethyl cellulose (CMC)-supported graphene oxide aerogel (CGOA) was fabricated from a cost-effective and abundant bituminous coal by a mild hydrothermal process and freeze-drying treatment. Such an aerogel has cross-linked graphene oxide layers supported by CMC, and therefore, displays high mechanical strength while having ultra-low density (8.257 mg·cm-3). The CGOA has a 3D interconnected porous structure, beneficial graphene framework defects and abundant oxygen-containing functional groups, which offer favorable diffusion channels and effective adsorption sites for the transport and adsorption of dye molecules. The adsorption performance of rhodamine B by an optimized CGOA shows a maximum monolayer adsorption capacity of 312.50 mg·g-1, as determined by Langmuir isotherm parameters. This CGOA exhibited a better adsorption efficiency (99.99%) in alkaline solution, and satisfactory stability (90.60%) after three cycles. In addition, adsorption experiments on various dyes have revealed that CGOA have better adsorption capacities for cationic dyes than anionic dyes.

References

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Citations

Jun 12, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Dun WuWenyong Zhang
Sep 13, 2020·Environmental Science and Pollution Research International·Shahram SadeghiGuilherme Luiz Dotto
Nov 21, 2020·Environmental Science and Pollution Research International·Xiuxiu ZhangChuanxiang Zhang

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Methods Mentioned

BETA
X-ray

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