Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 297, Issue 2, Pages 434-442Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2005.10.054
Keywords
activated carbon; chemical treatment; thermal treatment; surface oxygen complexes; characterisation; benazolin; 2,4-dichlorophenoxy acetic acid (2,4-D); adsorption isotherm; kinetic studies; pseudo-second-order kinetic model
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The performance of a conventional (17400) and a surface modified activated carbon (F400AN) has been investigated for the sorption of benazolin and 2,4-dichlorophenoxy acetic acid (2,4-D) from water. It was observed that the modified carbon, F400AN, which was obtained by annealing the conventional sample had a higher BET surface area (960 m(2) g(-1) compared to 790 m(2) g(-1)) and it had a higher proportion of micropores. This was attributed to the loss of oxygen containing functional groups during the thermal treatment. Zeta potential and pH titration measurements also showed that acidic functionality had been lost on the F400AN sample. The adsorption data were analysed and were fitted well using the Langmuir isotherm. The modified carbon marginally out-performed the conventional activated carbon for sorption of these two herbicides. Thermodynamic parameters (Delta G(0), Delta H-0, and Delta S-0) were determined and their Values indicated that the sorption process was spontaneous and endothermic for both herbicides. A pseudo-second-order kinetic model was employed for analysing the kinetic data. It was concluded that the herbicide sorption process was controlled by a film diffusion mechanism. (c) 2005 Elsevier Inc. All rights reserved.
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