Effect of functionalization on the adsorption capacity of cellulose for the removal of methyl violet.
In this research paper a comparative study has been carried out for the removal of methyl violet dye using unfunctionalized and functionalized cellulose. The functionalization was achieved through esterification of cellulose with furan-2,5-dione. The functionalization of the cellulose was evidenced using BET, FT-IR, SEM and TGA. The adsorption isotherm data was fitted using different isotherm models like Langmuir, Freundlich, Temkin, Flory-Huggins and Dubinin-Kaganer-Radushkevich models and found to follow Langmuir and Temkin isotherm models with high value of correlation coefficients. Functionalized cellulose (106.38 mg g(-1)) showed higher dye removal capability than unfunctionalized cellulose (43.668 mg g(-1)). The kinetics of adsorption was investigated using pseudo first order, second order, Elovich, liquid film diffusion and intra-particle diffusion models. The mechanism of adsorption was found to follow pseudo second order rate equation. Thermodynamic studies showed that the adsorption process was endothermic and spontaneous.
Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, P.O. Box 17011, 37 Nind Street, Doornfontein, South Africa.
Stephen Makali
SM
Musyoka
Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, P.O. Box 17011, 37 Nind Street, Doornfontein, South Africa.
Hemant
H
Mittal
Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, P.O. Box 17011, 37 Nind Street, Doornfontein, South Africa. Electronic address: smishra@uj.ac.za.
Shivani B
SB
Mishra
Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, P.O. Box 17011, 37 Nind Street, Doornfontein, South Africa.
Jane Catherine
JC
Ngila
D000327:Adsorption; D002482:Cellulose / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry* / Q000302:isolation & purification*; D004058:Diffusion; D005840:Gentian Violet / Q000737:chemistry* / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D013696:Temperature; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification*
D004396:Coloring Agents; D014874:Water Pollutants, Chemical; D002482:Cellulose; D005840:Gentian Violet
Adsorption; Cellulose; Esterification; Functionalization; Methyl violet