Solvent-free synthesis of carboxylate-functionalized cellulose from waste cotton fabrics for the removal of cationic dyes from aqueous solutions

摘要: In this work, the carboxylate-functionalized cellulose (CFC) from waste cotton fabrics (WCF) was studied for removal of cationic dyes aqueous solutions. Instead using conventional process esterifying cellulose, which uses sulfuric or perchloric acid as catalysts, and methylene chloride solvent, a novel mechanochemical approach requires no catalyst solvent in reaction mixture used. The prepared CFC with high concentrations carboxyl groups ranging 1.34 to 2.14 mmol/g tested adsorbent blue (MB) rhodamine 6G (R6G) modified showed much higher adsorption capacity than that unmodified WCF. effect operating variables such concentration groups, solution pH, dosage, temperature, initial dye on were investigated. maximum (185.63 mg/g MB 118.21 mg/g R6G) obtained at pH = 10 temperature 298 K. experimental equilibrium data analyzed by Langmuir Freundlich isotherm models results indicated behavior both could be described well isotherm. value standard enthalpy changes −26.48 kJ/mol −42.16 kJ/mol R6G, suggesting is exothermic nature. revealed solvent-free mechanochemistry an environmentally friendly method prepare efficient absorbent wastewater.