Volume No. 12 Issue No.: 1 Page No.: 56-69 July-September 2017

 

COMPARATIVE BATCH , THERMODYNAMICS AND KINETIC STUDY OF DEFLUORIDATION UTILIZING ACTIVATED CARBON FROM SAW DUST IN DIFFERENT IMPR -EGNATION RATIO

 

Roy Swapnil and Das Papita

Department of Chemical Engineering, Jadavpur University, Kolkata (INDIA)

 

Received on : May 05, 2017

 

ABSTRACT

 

The present study is highlighted on de-fluoridation efficiency in synthetic water utilizing low-cost starting material converted to activated carbon(AC), activated by magnesium chloride (MgCl2) in different impregnation ratio (IR) (0.25,0.5,1.0)upon thermal treatment. Comparative batch studies were conducted in different experimental conditions to investigate the influence of different process parameters on de-fluoridation. The phenomenon of fluoride ion uptake is realized by Langmuir and Freund lichadsorption model. Langmuir is otherm shows satisfactory fit to the experimental data. The rate of adsorption implies that the pseudo-second-order rate well fitted the adsorption kinetics better than the pseudo-first-order rate equation. The mechanism of adsorptionprocess was illustrated by calculating Gibbs free energy, enthalpy and entropy from thermodynamic studies.In this present investigation, it is represented that regeneration % of activated carbon (IR:1.0) prepared from saw dust in 5 adsorption-desorption cycles are 90.92%, 86.46%, 80.13%, 71.01%, and 62.53% respectively. The optimum contact time,dosageof adsorbent andpH for activated carbon with I.R(1.0) were found to be 60 min,1 g L-1 and 2.00respectively. In that condition, it is performing high level of fluoride removal efficiency (92.4%). So it may be concluded that as saw dust is easily available material,so chemically synthesized activated carbon can be used for defluoridation in waste water .

 

Keywords : De-fluoridation, Activated Carbon, Impregnation ratio, Isotherm model, Kinetics, Thermodynamics

 

 

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