Carbon dots crosslinked chitosan/cellulose sponge capture of methyl blue by an adsorption process

Abstract

For environmental protection, organic dyes and solvents of industrial wastewater must be eliminated. Here, a citric acid‐based carbon dots (CA‐CDs) crosslinked chitosan/microcrystalline cellulose (CS/MCC/CA‐CDs) sponge was synthesized to study its adsorption performance for methyl blue (MB) dye. The morphology of the sponge was a tangled fibre with a bundle formed by hydrogen bonds between CA‐CDs and the CS/MCC composite matrix. The abundant amount of tangled fibre bundle units can offer plentiful active adsorption sites to collect the dye molecules. The adsorption capacity of the CS/MCC/CA‐CDs sponge toward MB was 306.8 mg/g at pH 10 and a temperature of 298 K. In addition, the pseudo‐second‐order kinetic model was matched with the adsorption kinetic experimental data, and the adsorption isotherm data can be described by the Langmuir models. This study proposed that the CS/MCC/CA‐CDs sponge adsorbent creates tremendous potential application value in wastewater treatment due to its fast kinetics, high adsorption capacity, simple preparation, and eco‐friendly properties.

Preparation of Aminated Sodium Lignosulfonate and Efficient Adsorption of Methyl Blue Dye

“…However, in this case, the C value was not zero, suggesting that external mass transfer also played a role in driving the adsorption process. The increasing C value implied a heightened significance of the boundary layer in methyl blue adsorption [ 42 ].…”

Reusable flexible poly(vinyl alcohol)/chitosan‐based polymer carbon dots composite film for acid blue 93 dye adsorption

“…The results demonstrated the excellent detection and adsorption capabilities of composite coagulation for the Cr(VI) ion [30]. Our group [15] also used carbon dots as a cross-linker to synthesize a chitosan cellulose-based composite sponge for dye adsorption that exhibited a strong adsorption effect.…”

“…The results demonstrated the excellent detection and adsorption capabilities of composite coagulation for the Cr(VI) ion [30]. Our group [15] also used carbon dots as a cross‐linker to synthesize a chitosan cellulose‐based composite sponge for dye adsorption that exhibited a strong adsorption effect. While these adsorption materials have demonstrated excellent adsorption effects, there have been few reports of nontoxic and reusable polyvinyl alcohol‐based film adsorption materials.…”

“…The structure and morphology of the adsorbent influence the efficiency of the adsorption treatment. Researchers have designed various adsorbents, including polymer gels [14], composite sponges [15], minerals [16,17], plant fibres [18], metallic materials [19], metal-organic frameworks (MOFs) [20], covalent organic frameworks (COFs) [21], synthetic polymeric materials [22], and carbon nanocomposites. However, metallic and mineral materials such as COFs, MOFs, and metal oxides have limited adsorption capacity because of the presence of few adsorption sites.…”

Preparation of magnetic cobalt-cuprum-zinc ferrite nanoparticles and their adsorption mechanism of methyl blue

“…The Langmuir model assumed the monolayer adsorption, where all the points had the same energy in a homogeneous adsorption plane, yielding an adsorption effect in the gap. The expression for the Langmuir On the other hand, the Freundlich adsorption isothermal assumed an uneven adsorption at the surface, the expression for the Freundlich model is equation (7) [27].…”