Journal
CHEMICAL ENGINEERING RESEARCH & DESIGN
Volume 128, Issue -, Pages 221-230Publisher
INST CHEMICAL ENGINEERS
DOI: 10.1016/j.cherd.2017.10.015
Keywords
Spent bleaching sorbent; Carbonization; K2CO3; Batch adsorption; Methylene blue; Acid blue 29
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An activated carbon-clay (ACC) composite was prepared using spent bleaching sorbent generated from refined olive pomace oil through carbonization followed by K2CO3 activation. The adsorption-removal efficiencies for acid blue 29 (AB 29) and methylene blue (MB) of the developed ACC were examined. The K2CO3 activation process was optimized using Box-Behnken design. The optimum conditions were a K2CO3 impregnation ratio of 1:1, an activation temperature of 800 degrees C, and an activation time of 120 min, under which the optimized ACC achieved 83.81% AB 29 and 96.20% MB removal. The surface properties of the optimized ACC were characterized by different physicochemical measures and techniques, including surface area, point of zero charge, scanning electron microscopy, and Fourier transform infrared spectroscopy. Pseudo-second-order and Langmuir models best fitted the adsorption kinetics and isotherm experimental data. The maximum monolayer adsorption capacity of the ACC was 104.83 and 178.64 mg/g for AB 29 and MB, respectively, at 30 degrees C. All these results indicated the potential application of ACC in dye adsorption. (C) 2017 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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