Page 24 - Book of Abstracts 2020

8 Biannual Conference on Chemistry - CHEM 08
th

Experimental and Computational Chemistry Studies on the
Removal of Methylene Blue and Malachite Green Dyes
From Aqueous Solution by Chitosan/Raphia Palm

Composite
Paul O. Ameh
Physical And Polymer Chemistry Unit, Department of Chemistry,
Nigeria Police Academy, Wudil, P. M B. 3474, Kano State Nigeria.
Email: amehpaul99@gmail.com; nocaseoche@yahoo.com

ABSTRACT

Experimental and computational chemistry approaches were applied to
study the adsorption of methylene blue and malachite green dyes from
aqueous solution by chitosan/raphia palm composite (CRPC). Batch
adsorption experiments were concluded by measuring absorbance at
wavelength of 660 and 630 nm for methylene blue and malachite green
dyes respectively. The adsorption of the dyes on CRPC favoured
Langmuir and Temkin isotherms and was influenced by pH, contact time
concentration, biomass and dose. The kinetic studies showed that the
adsorption followed a pseudo-second-order model with chemisorption
mechanism being favoured. Results from the thermodynamic study of
reactive dyes adsorption onto chitosan / raphia palm composite indicated

that the process was spontaneous and endothermic nature. Quantum
chemical analysis supported better adsorption of methylene blue dye on
CRPC surface than malachite green dye and through Fukui function
analysis, the site for adsorption of the dyes was proposed.

Keywords: Adsorption, Chitosan, Reactive dye, Polymer, Water pollution.

BOOK OF ABSTRACTS CHEM 08 (2020) Page 23