Adsorption Kinetics and Thermodynamics of COD Removal of Acid Pre-treated Petrochemical Wastewater by using Granular Activated Carbon

Granular activated carbon (GAC) was used as adsorbent in batch experiments for the removal of COD from Purified Terephthalic Acid (PTA) wastewater. The results showed that COD adsorption onto GAC follows pseudo-second-order rate kinetics and that both boundary-layer diffusion and intraparticle diffu...

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Published inSeparation science and technology Vol. 49; no. 7; pp. 1067 - 1075
Main Authors Verma, Shilpi, Prasad, Basheshwar, Mishra, Indra Mani
Format Journal Article
LanguageEnglish
Published Taylor & Francis 03.05.2014
Subjects
Activated carbon
Adsorption
Boundaries
COD
Diffusion
Diffusion rate
GAC adsorption
kinetics
petrochemical wastewater
Surface chemistry
Terephthalic acid
thermodynamics
Waste water
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Summary:Granular activated carbon (GAC) was used as adsorbent in batch experiments for the removal of COD from Purified Terephthalic Acid (PTA) wastewater. The results showed that COD adsorption onto GAC follows pseudo-second-order rate kinetics and that both boundary-layer diffusion and intraparticle diffusion are likely involved in the rate-limiting mechanisms. The adsorption of PTA wastewater components (COD) onto GAC was found to be exothermic. ΔH° value is −18.34 kJ/ mol indicating the complexity of the adsorption which is neither completely physical nor chemical in nature. The energetically heterogenic nature of the GAC surface was depicted by the variation in ΔH st,a with the surface loading.
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ISSN:0149-6395
1520-5754
DOI:10.1080/01496395.2013.870200