Adsorption of Acid Dyes onto Bentonite and Surfactant-modified Bentonite
Akl MA*, Youssef AM and Al-Awadhi MM
Department of Chemistry, Faculty of Science, Mansoura University, Egypt
- *Corresponding Author:
- Akl MA
Department of Chemistry, Faculty of Science
Mansoura University, P.O. Box 70
E-mail: [email protected]
Received date: September 23, 2013; Accepted date: October 23, 2013; Published date: October 25, 2013
Citation: Akl MA, Youssef AM, Al-Awadhi MM (2013) Adsorption of Acid Dyes onto Bentonite and Surfactant-modified Bentonite. J Anal Bioanal Tech 4:174. doi: 10.4172/2155-9872.1000174
Copyright: © 2013 Akl MA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Adsorption of Congo red (CR) from water via batch adsorption experiments onto bentonite and CTAB-modified bentonite (CTAB-MBn) was investigated. Studies concerning the factors influencing the adsorption capacities of bentonite and CTAB-MBn, such as initial dye concentration, adsorbent dosage, pH, ionic strength, contact time and temperature were systematically investigated and discussed. The results revealed that CTAB-modified bentonite demonstrated high adsorption capacities toward acid dyes, while bentonite exhibited sorption capacities lower than CTAB-MBn. The kinetics data were analyzed using first order and pseudo-second order models. It was best described by the pseudo-second order model. The isotherm data were investigated according to Langmuir and Freundlich equations. Thermodynamic parameters ΔG°, ΔH° and ΔS° were calculated for the adsorption of CR on bentonite and CTAB-MBn ; the value of ΔG° showed the spontaneous nature of adsorption for both sorbents.