Adsorptive retention of citric acid onto activated carbon prepared from Havea braziliansis sawdust: Kinetic and isotherm overview

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• 作者：K. Anoop Krishnan ; K.G. Sreejalekshmi ; Sumol Varghese
• 关键词：Sawdust activated carbon ; Adsorption ; Kinetics ; Citric acid ; Speciation ; Isotherm
• 刊名：Desalination
• 出版年：2010
• 出版时间：July 2010
• 年：2010
• 卷：257
• 期：1-3
• 页码：46-52
• 全文大小：709 K

文摘

Retention of citric acid, an organic ligand, from aqueous phase was studied using activated carbon (15 % K₂CO₃ treated) prepared from Havea braziliansis saw dust obtained from a local timber industry at Kodangavila, Trivandrum, Kerala, India. Batch adsorption studies were performed to evaluate the effect of various parameters such as pH, contact time, initial citric acid concentration and adsorbent dose for the adsorptive retention process. The mechanism of citric acid adsorption from aqueous solution was investigated by conducting pH as well as kinetic studies. The maximum adsorption of citric acid onto activated carbon occurred at a pH value around 5.0. The kinetic adsorption data was in close agreement with pseudo-first-order than pseudo-second-order expression. The solution pH, zero point charge (pH_zpc) and citric acid speciation played important roles in the extent of citric acid adsorption onto activated carbon from water and wastewaters. The equilibrium data obtained from isotherm studies explains the L-type adsorption process and follows a Langmuir type isotherm model.