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|Title:||Treatment of phenol rich aqueous solutions using surface modified pillared clay|
|Authors:||Vinod, Y P|
Anirudhan, T S
|Abstract:||The efficacy of humic acid treated zirconium pillared clay (HA-PILC) in the removal of phenol from aqueous solution has been investigated using batch adsorption technique at different sorbate concentrations, rate of agitation, pH and temperature. The maximum removal of 98.0, 84.0 and 73.2 % has been noted at pH 5.0 for an initial concentration of 25, 50 and 100 mg/L respectively. The maximum adsorption capacity has been observed at pH 5.0. The process of uptake follows a first-order reversible kinetic expression. The removal process has also been found to be diffusion controlled. The adsorption capacity has been increased from 78.2 to 92.6 % with an increase in agitation speed from 100 to 400 rpm at an initial concentration of 50 mg/L. The adsorption isotherm for phenol removal may be classified as L-type of the Giles classification, which suggests a favourable adsorption, and the adsorbent has a high affinity for phenol. The adsorption data points have been fitted to both Langmuir and Freundlich isotherm equations. The maximum adsorption capacity (Q0) decreases from 179.86 mg/g at 10°C to 126.69 mg/g at 40°C. Lower temperat ure has been found to be more effective in the removal of phenol. Thermodynamic parameters such as ΔG0,ΔH0and ΔS0 for the adsorption process have been calculated to predict the nature of adsorption process. Cost of the HA-PILC and its adsorption capacity with other adsorbent materials reported in the literature, have also been presented.|
|ISSN:||0975-1017 (Online); 0971-4588 (Print)|
|Appears in Collections:||IJEMS Vol.09(2) [April 2002]|
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