Possible Utilization of Silica Gel Sludge for the Removal of Phenol from Aqueous Solutions: Laboratory Studies

This paper discusses the adsorption capacity of silica gel sludge for phenol removal from aqueous solution. Kinetic experiments showed that phenol adsorption was completed after 2 h. Adsorption isotherms were measured for phenol from aqueous solution onto silica gel sludge under various pHs and temp...

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Bibliographic Details
Published in:The Environmentalist 2003-12, Vol.23 (4), p.329-334
Main Authors: Idris, Azni, Saed, Katayon
Format: Article
Language:English
Subjects:
Activated carbon
Adsorbents
Adsorption
Aqueous solutions
Capacity
Civil engineering
Copyrights
Documents
Environmental engineering
Equilibrium
Experiments
Isotherms
Kinetics
Laboratories
Mathematical models
Moisture content
Optimization
Phenol
Phenols
Pollution control
Silica
Silica gel
Sludge
Statistical analysis
Temperature
Utilization
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Summary:This paper discusses the adsorption capacity of silica gel sludge for phenol removal from aqueous solution. Kinetic experiments showed that phenol adsorption was completed after 2 h. Adsorption isotherms were measured for phenol from aqueous solution onto silica gel sludge under various pHs and temperatures. Results showed that the adsorption capacities for phenol was increased as pH decreased from 6.5 to 2. Temperature also was found to affect the adsorption isotherm. As temperature increases from 30 to 50degC, the adsorption capacity increases. The adsorption equilibrium of phenol on silica gel sludge was described by the linear Freundlich and Langmuir models. Furthermore, results showed that the isotherm parameters fit both linearized Langmuir and Freundlich adsorption isotherms. The Freundlich and Langmuir parameters at optimum pH was found as Kf=2.89, 1/n=0.23 and Kd=22.0, qm=7.98, respectively. Whereas, for those at optimum temperature it was observed as Kf=2.87, 1/n=0.16 and Kd=20.93, qm=7.91, respectively. [PUBLICATION ABSTRACT]
ISSN:0251-1088
2194-5403
2194-5411
DOI:10.1023/B:ENVR.0000031411.87732.b1