Adsorption of methylene blue from aqueous solution onto porous cellulose-derived carbon/montmorillonite nanocomposites

By D. Tong, Chengcheng Wu, M. Adebajo, Guixin Jin, W. Yu, Sheng-fu Ji, C. Zhou. Applied Clay Science, 2018

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Abstract Biomass-derived amorphous carbon has received considerable attention in recent decades. In this paper, carbon/montmorillonite (CMt) nanocomposites were synthesized by a hydrothermal carbonization of cellulose and montmorillonite (Mt), and the adsorption properties were evaluated by the removal of methylene blue (MB) from aqueous solutions. The CMt was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Nitrogen adsorption-desorption isotherm, Scanning electron microscopy, and Thermal analysis. The pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetic data and the Langmuir, Freundlich, Redlich-Peterson and Sips models were applied to describe the adsorption isotherms. The results showed that the equilibrium adsorption data was found to fit better to the Redlich-Peterson adsorption model, and the adsorption capacity for the removal of MB on CMt was 138.1 mg·g−1. The kinetic process of adsorption could be described by the pseudo-second-order model. The porous structure of CMt was responsible for the adsorption of MB. But the adsorption ability could be improved by increasing pH. Lastly, the adsorption mechanism was obtained.

Subfields: Electronic, Optical and Magnetic Materials, Organic Chemistry, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/321b0ce2843cd2c19eaf3587d31cf74014b18281