Adsorption of methylene blue from aqueous solution by crosslinked carboxymethyl cellulose/organo-montmorillonite composite hydrogels

Environmentally friendly crosslinked carboxymethyl cellulose-based hybrid hydrogels (CCMC/OMMT) were prepared from a grafting of 2-acrylamide-2-methylpropane sulfonic acid (AMPS) onto CCMC and reinforced with Organo-Montmorillonite (OMMT) in this study as efficient adsorbents for methylene blue (MB). FTIR, SEM, XRD, EDS, XPS, and TGA techniques have been employed to investigate the composition and shape of the setup hydrogels. The MB adsorption ability of CCMC/OMMT was investigated concerning the initial MB concentration, pH, interaction time, and temperature. The capacity of CCMC/OMMT to adsorb on MB was 490.5 mg/g at 313.15 K and pH 7.0. Furthermore, the adsorption kinetics and isotherm were accurately predicted using the pseudo-second-order dynamic theory and Langmuir isotherm theory. The estimated thermal parameters ΔG 0 , ΔH 0 , and ΔS 0 suggested that the molecules of MB binding on the CCMC/OMMT were spontaneous and endothermic. The procedures of sorption were facilitated by electrostatic attraction and hydrogen-bonding interaction. Additionally, all manufactured hydrogels were reusable for MB removal. As a result, CCMC/OMMT can be used as environmentally safe, productive, and washable stuff for MB in sewage treatment.