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Humic Acid removal from Aqueous solution using Aluminium Pillared Bentonite clay and its Recovery

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Author Affiliations

  • 1Departmaent of chemestry ,fatima Mata National College, Kollam-691001, India
  • 2Departmaent of chemestry ,fatima Mata National College, Kollam-691001, India
  • 3Department of Chemistry, University of Kerala, Trivandrum - 695581, India

Res. J. Recent Sci., Volume 5, Issue (ISC-2015), Pages 71-78, -----Select----,2 (2016)

Abstract

This work aims to evaluate the performance of aluminium pillared clay for humic acid adsorption from aqueous solutions. Pillared clay was prepared from natural bentonite clay with aluminium chloride and was found to be effective for humic acid removal. The adsorption of humic acid onto Al-PILC has been dynamically and thermodynamically investigated. Batch experiments were carried out as a function of solution pH, contact time, humic acid concentration, ionic strength and temperature. The maximum adsorption capacity was observed at a pH of 3.0. The maximum adsorption of 90 and 80% took place at pH 3.0 from an initial concentration of 15 and 30 µmol L-1, respectively. Lagergren first order kinetic model was tested to describe the kinetic data. As the initial concentration increases from 15 to 60 µmol L-1 the percentage adsorption decreases from 90 to 65. The percentage removal of humic acid increased with increasing ionic strength. The equilibrium isotherm data were fitted to the Langmuir, Freundlich and Scatchard isotherm equations to obtain the characteristic parameters of each model. The Langmuir model represents the experimental data fairly well as is evident from the correlation coefficient r2 and relative standard deviation (?q%). The maximum adsorption capacity (Qo) obtained from the Langmuir isotherm plot was 26.18 µmol g-1 at pH 3.0 and at 30 oC. Isotherm experiments conducted at different temperatures allowed the calculation of the isosteric heat of adsorption at different surface loading. The desorption data showed that the spent PILC can be regenerated for further use by 0.1 M NaOH.

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