Kinetic and Thermodynamic of Gentian Violet Removal by 2,3-Dialdehyde Nanocellulose

Laid Zaghoud , Messaoud Gouamid , Abdelkader Benmenine , Abdelkader Khanblouche

Abstract

In this work, the authors were interested in removal of gentian violet by oxidized nanocellulose, the extracted cellulose from date palm bunches transformed into nanocellulose by acid hydrolysis, and then to 2,3-dialdehyde nanocellulose by selective oxidation. The adsorption removal of gentian violet (GV) onto 2,3-dialdehyde nano-cellulose (DNC) was investigated using batch adsorption technique.The effects of initial solution pH, Time, adsorbent dosage and initial concentration of gentian violet, and temperature were scrutinized. Langmuir, Freundlich, Dubinin-Radushkevich and Temkin adsorption isotherms were applied to analyze the single component equilibrium data. The findings indicated that equilibrium was obtained within 20 min. The highest adsorption capacity was found at pH 8 for the used biosorbent. The experimental isotherm data were analyzed and modeled. The maximum adsorption capacity, Langmuir’s qmax, improved from 11.71 to 12.05 mg/g as the temperature increased from 20 to 40°C. The enthalpy ΔH° and entropy ΔS° values were respectively estimated at 45.4 kJ mol-1 and -0.206 kJ K-1 mol-1. The adsorption of GV onto (DNC) is a spontaneous process. The findings indicated the pseudo-second order equation could describe the adsorption of gentian violet, indicating that the adsorption process is presumably a chemisorption.



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