Abstract
A novel three-dimensional carboxymethyl cellulose (CMC)/reduced graphene oxide (rGO) composite aerogel crosslinked by poly (methyl vinyl ether-co-maleic acid)/poly (ethylene glycol) system via a directional freezing technique exhibits high structure stability while simultaneously maintaining its excellent adsorption capacity to remove organic dyes from liquid. A series of crosslinked aerogels with different amounts of GO were investigated for their adsorption capacity of methylene blue (MB), which were found to be superb adsorbents, and the maximum adsorption capacity reached 520.67 mg/g with the incorporation of rGO. The adsorption kinetics and isotherm studies revealed that the adsorption process followed the pseudo-second-order model and the Langmuir adsorption model, and the adsorption was a spontaneous process. Furthermore, the crosslinked aerogel can be easily recycled after washing with dilute HCl solution, which could retain over 97% of the adsorption capacity after recycling five times. These excellent properties endow the crosslinked CMC/rGO aerogel’s potential in wastewater treatment and environment protection.
Highlights
With the rapid development of the social economy, water pollution caused by wastewater from various industries is emerging as an intractable and vital issue for modern society
Inspired by the aforementioned research, a novel carboxymethyl cellulose (CMC)/rGO composite aerogel crosslinked by the PMVEMA/polyethylene glycol (PEG) system was fabricated in an eco-friendly way via the template-directed growth, and it exhibited strong structure stability in aqueous conditions and excellent adsorption capacity to remove organic dyes
Insertion of aerogels and 1.0055, respectively), which can be attributed to the insertion of CMC and PMVEMA/PEG into the Graphene oxide (GO) nanosheets
Summary
With the rapid development of the social economy, water pollution caused by wastewater from various industries is emerging as an intractable and vital issue for modern society. Graphene and its composite materials have been reported as a superior adsorbent for removal of dyes from wastewater because of the high surface area, chemical stability and large delocalized π-electron arrangements. Reported a self-recoverable, adjustable amphiphilic graphene aerogel as an efficient and recyclable absorbent for dye removal All these articles showed great potential of GO as an additive to enhance the adsorption function of the generated materials. Inspired by the aforementioned research, a novel CMC/rGO composite aerogel crosslinked by the PMVEMA/PEG system was fabricated in an eco-friendly way via the template-directed growth, and it exhibited strong structure stability in aqueous conditions and excellent adsorption capacity to remove organic dyes. We thoroughly studied the equilibrium, kinetics, adsorption mechanism and desorption process These features revealed that the template-directed grown crosslinked CMC/rGO aerogel could be a high-efficiency adsorbent for the removal of MB from aqueous solution
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