Organic micro-pollutant removal in liquid-phase using carbonizedsilk cotton hull
M Sathishkumar , A R Binupriya , D Kavitha , R Selvakumar , K K Sheema , J G Choi , S E Yun
DOI:
Received July 18, 2007,Revised April 01, 2008, Accepted , Available online
Volume 20,2008,Pages 1046-1054
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Phenolic compounds constitute one of the major pollutants in the modern world. Although many physical and chemical treatment
technologies for their removal exist, most of them are economically not feasible. The present study was aimed at using silk cotton hull, a
potent agricultural waste as an adsobent for removal of 2,4-dichlorophenol (2,4-DCP), which was used as a model phenolic compound.
The process parameters were investigated and optimized conditions were determined. The equilibrium time was found to be 60 and 80
min for 10 and 20 mg/L and 100 min for 30 and 40 mg/L 2,4-DCP concentrations, respectively. Among the kinetic models applied,
pseudo-second order model fitted well. The maximum adsorption capacity was 16.0 mg/g by Langmuir isotherm. Acidic pH was found
favorable for the adsorption of 2,4-DCP. Studies on pH e ect and desorption seemed to show that chemisorption played a major role in
the adsorption process. In thermodynamic study, the change in entropy ( S 0) and heat of adsorption ( H0) of silk cotton hull carbon
(SCHC) was estimated as 14.01 J/(mol K) and 3.04 kJ/mol, respectively. SCHC as adsorbent for removal of 2,4-DCP from aqueous
solution, is e ective, inexpensive, indigenous, reusable, has low treatment time and is easily available in large quantities as waste there
by significantly lowers the cost of wastewater treatment.
