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|Title:||Non-conventional low-cost adsorbent from <i style="">Euphorbia antiquorum L</i> for the removal of Direct Blue 53 from its aqueous solution|
Palanisamy, P N
|Keywords:||<i style="">Euphorbia antiquorum L</i>|
|Abstract:||This paper reports the adsorption potential of activated carbon prepared from <i style="">Euphorbia antiquorum L</i> wood by H<sub>3</sub>PO<sub>4</sub> impregnation in batch mode experiments. The effects of various process controlling parameters such as solution pH, adsorbate concentration and temperature are analyzed. Maximum of 58.40 mg/g of dye adsorbed at a pH of 2.0 and the adsorption decreases with increase in pH. Various kinetic and isotherm models are employed to analyze the feasibility and mechanism of adsorption. The prepared adsorbent removed 145.45 mg/g of dye at an initial dye concentration of 100 mg/L and the kinetics obeys pseudo second order. Freundlich isotherm fits exceptionally well with good <i style="">r</i><sup>2</sup> value. Thermodynamic parameters like <img src='/image/spc_char/delta.gif' border=0><i style="">G</i>°, <img src='/image/spc_char/delta.gif' border=0><i style="">H</i>° and <img src='/image/spc_char/delta.gif' border=0><i style="">S</i>° are evaluated. The positive enthalpy proves that the adsorption process is endothermic in nature. Experiments are also performed for recovery of dye loaded carbon through regeneration as a function of pH, the maximum desorption occurs at a pH of 10 is only 19.29%. The prepared sorbent can be conveniently employed for the colour removal as its adsorptive capacity is comparable with commercial adsorbents.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.18(3) [May 2011]|
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