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Simultaneous oxidation and esterification of cellulose for use in treatment of water containing Cu(II) ions

Gupta, Arijit Dutta, Pandey, Sweta, Jaiswal, Vivek Kumar, Bhadauria, Vivek, Singh, Harinder
Carbohydrate polymers 2019 v.222 pp. 114964
Fourier transform infrared spectroscopy, X-ray diffraction, adsorbents, adsorption, anhydrides, cellulose, copper, esterification, heat production, hydrochloric acid, ions, models, moieties, oxidation, pH, scanning electron microscopy, sodium hydroxide, sodium hypochlorite, sorption isotherms, temperature, thermogravimetry, viscosity
Cellulose powder was modified with Sodium Hypochlorite (NaOCl) and Octenyl Succinic Anhydride (OSA) in different proportions. The adsorbents were characterised by BET, FTIR, XRD, TGA and SEM. Intrinsic viscosity increased with degree of substitution (DS). FTIR peaks confirmed the presence of carbonyl groups. Batch adsorption parameters studied were contact time, adsorbent dosage, pH and temperature. Adsorption process was influenced significantly by pH. Freundlich isotherm showed a better correlation coefficient (R2 and χ2) than Langmuir and Temkin isotherms. The adsorption process was inferred as physico-chemical adsorption process (based on isotherm and kinetic modelling). Pseudo second order kinetics model was found to fit well on the empirical data obtained. Adsorption of Cu(II) ions over the modified cellulose was found to be exothermic in nature (ΔH<0). HCl was found to be more effective desorbing agent than NaOH.