Kinetics of cadmium adsorption by CNTs grown on PACs

Mamun, Abdullah Al and AlSaadi, Mohammed AbdulHakim and Muyibi, Suleyman Aremu and Alam, Md Zahangir and Iis, Sopyan (2014) Kinetics of cadmium adsorption by CNTs grown on PACs. International Journal of Nanoelectronics and Materials, 7 (1). pp. 25-33. ISSN 2232-1535

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Abstract

Isotherms and kinetic models are useful tool for the investigation of adsorption process. Carbon nanotubes (CNTs) grown on powdered activated carbons (PACs) was used as novel adsorbent. Two isotherms and three kinetic models were studied for the removal of cadmium from water. The isotherms were Langmuir and Freundlich and the kinetic models were pseudo first order, pseudo second order and intraparticle diffusion models. Langmuir constants were qm = 69.759 mg/g, Kl = 0.223 and R2 = 0.924. The adsorption process was found more likely to follow Freundlich model with R2 value of 0.961, Kf of 9.215 and n of 3.015. Based on the kinetics study, the pseudo second order was the best fit with R2 of 0.996 and model constants were qe = 34.29 (mg/g) and K2 = 0.0013 (g/mg.min). Coefficients for the pseudo first order were qe= 21.145 (mg/g) and K1= 0.09 (min-1) with R2 of 0.936. The intraparticle kinetic model exhibited R2 value of 0.812 with Kd = 1.295 (g/mg.min0.5). CNTs after oxidative functionalization with KMnO4 were observed to be an efficient adsorbent for Cd2+ removal from water.

Item Type:	Article (Journal)
Additional Information:	5174/57012
Uncontrolled Keywords:	Adsorption, cadmium, CNTS, kinetics, PACs
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA170 Environmental engineering. Sustainable engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Biotechnology Engineering Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Dr Abdullah Al Mamun
Date Deposited:	22 Jan 2018 11:24
Last Modified:	22 Jan 2018 11:24
URI:	http://irep.iium.edu.my/id/eprint/57012

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