Journal
SEPARATION SCIENCE AND TECHNOLOGY
Volume 39, Issue 6, Pages 1407-1425Publisher
TAYLOR & FRANCIS INC
DOI: 10.1081/SS-120030490
Keywords
2,4-dichlorophenol; adsorption; coir pith carbon; isotherms; pH effect; desorption studies
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Coconut coir pith, a solid waste generated in coir fibre industries, was carbonized and used as adsorbent for the removal of 2,4-dichlorophenol (2,4-DCP) from water. Varying parameters such as agitation time, 2,4-DCP concentration, adsorbent dose, pH, and temperature were investigated. Adsorption equilibrium reached at 60, 80, 100, and 120 min for 2,4-DCP concentrations of 10, 20, 30, and 40 mg L-1, respectively. Adsorption followed pseudo-second order kinetics. The adsorption equilibrium data moderately obeyed Langmuir and Freundlich isotherms. The adsorption capacity was found to be 19 mg g(-1) of carbon. Increase of temperature increased adsorption. Acidic pH was favorable for the adsorption of 2,4-DCP. Studies on pH effect and desorption show that both physisorption and chemisorption were involved in the adsorption process.
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