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Equilibrium and kinetic studies of adsorption of phosphate onto ZnCl 2 activated coir pith carbon
C. Namasivayam,
Published in
2004
Volume: 280
   
Issue: 2
Pages: 359 - 365
Abstract
Phosphate removal from aqueous solution was investigated using ZnCl 2-activated carbon developed from coir pith, an agricultural solid waste. Studies were conducted to delineate the effect of contact time, adsorbent dose, phosphate concentration, pH, and temperature. The adsorption equilibrium data followed both Langmuir and Freundlich isotherms. Langmuir adsorption capacity was found to be 5.1 mg/g. Adsorption followed second-order kinetics. The removal was maximum in the pH range 3-10. pH effect and desorption studies showed that adsorption occurred by both ion exchange and chemisorption mechanisms. Adsorption was found to be spontaneous and endothermic. Effect of foreign ions on adsorption shows that perchlorate, sulfate, and selenite decreased the percent removal of phosphate. © 2004 Elsevier Inc. All rights reserved.
About the journal
JournalJournal of Colloid and Interface Science
ISSN00219797