Acid blue 25 adsorption on base treated Shorea dasyphylla sawdust: kinetic, isotherm, thermodynamic and spectroscopic analysis

Megat Hanafiah, Megat Ahmad Kamal and Wan Ngah, Wan Saime and Zolkafly, Shahira Hilwani and Lee, Ching Teong and Abdul Majid, Zafri Azran (2012) Acid blue 25 adsorption on base treated Shorea dasyphylla sawdust: kinetic, isotherm, thermodynamic and spectroscopic analysis. Journal of Environmental Sciences-China, 24 (2). pp. 261-268. ISSN 1001-0742

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Abstract

The potential of base treated Shorea dasyphylla (BTSD) sawdust for Acid Blue 25 (AB 25) adsorption was investigated in a batch adsorption process. Various physiochemical parameters such as pH, stirring rate, dosage, concentration, contact time and temperature were studied. The adsorbent was characterized with Fourier transform infrared spectrophotometer, scanning electron microscope and Brunauer, Emmett and Teller analysis. The optimum conditions for AB 25 adsorption were pH 2, stirring rate 500 r/min, adsorbent dosage 0.10 g and contact time 60 min. The pseudo second-order model showed the best conformity to the kinetic data. The equilibrium adsorption of AB 25 was described by Freundlich and Langmuir, with the latter found to agree well with the isotherm model. The maximum monolayer adsorption capacity of BTSD was 24.39 mg/g at 300 K, estimated from the Langmuir model. Thermodynamic parameters such as Gibbs free energy, enthalpy and entropy were determined. It was found that AB 25 adsorption was spontaneous and exothermic.

Item Type:	Article (Journal)
Additional Information:	4556/29140
Uncontrolled Keywords:	Acid Blue 25; adsorption; Shorea dasyphylla sawdust; spectroscopy; thermodynamic
Subjects:	Q Science > QK Botany
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Allied Health Sciences
Depositing User:	Dr. Zafri Azran Abdul Majid
Date Deposited:	15 Mar 2013 16:10
Last Modified:	15 Mar 2013 16:11
URI:	http://irep.iium.edu.my/id/eprint/29140

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