DAS , M R and BORDOLOI , D and BORTHAKUR , P C and MAHIUDDIN , S (2005) KINETICS AND ADSORPTION OF BENZOATE AND SALICYLATE AT THE NATURAL HEMATITE-WATER INTERFACE. COLLOIDS AND SURFACES , 254 (1-3). pp. 49-55.

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Abstract

Kinetics of adsorption of benzoate and salicylate onto the natural hematite surfaces have been carried out at pH 5 and at a fixed ionic strength (I=1 ×10−4moldm−3). The state of equilibrium was attained at 144 and 70h for benzoate and salicylate, respectively. Adsorption behaviour of benzoate and salicylate onto the natural hematite was studied over a wide range of pH at a fixed I=5 ×10−4moldm−3 NaCl and at different temperatures. The adsorption isotherms for both the adsorbates were Langmuir type up to pH 8. TheΓmax for benzoate is ≈2.7–13.7 times more than that of salicylate depending on the pH of the suspension. Unlike benzoate, salicylate is not only adsorbed at one surfacesitebutalsocoversaroundthreeormoresurfacesitesofhematitesurface.Therateconstantforadsorption,K1 forsalicylateontothe natural hematite is greater than that of benzoate and increases with the increase in temperature and ≈4 times greater at a fixed temperature. Theactivationenergyfortheadsorptionofsalicylateontothenaturalhematiteis2.9timesmorethanthatofbenzoateonthesameadsorbent resulting in lowerΓmax.

Item Type:	Article
Subjects:	Chemistry > Material Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. PK Barooah
Date Deposited:	05 Jan 2012 07:09
Last Modified:	05 Jan 2012 07:09
URI:	http://neist.csircentral.net/id/eprint/302

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