Adsorption of phenol from aqueous solution by using carbonised beet pulp.

The beet pulp, a major low value by-product in sugar industry was used to prepare carbon for phenol adsorption. It was produced by carbonisation in N2 atmosphere at 600 degrees C for 1.5 h. The surface area of beet pulp carbon was measured as 47.5 m2g(-1) by using BET method. The adsorption studies of phenol from aqueous solution on beet pulp carbon (BPC) have been studied in the range of 25-500 mgdm(-3) initial phenol concentrations and at the temperatures of 25, 40 and 60 degrees C. The maximum phenol adsorption capacity was obtained as 89.5 mgg(-1)at the temperature of 60 degrees C at pH=6.0. The Freundlich and Langmuir adsorption models were used for the mathematical description of the adsorption equilibrium and it was reported that experimental data fitted very well to Freundlich model, although they could be modelled by the Langmuir equation. Batch adsorption models, based on the assumption of the pseudo-first order and pseudo-second order mechanism, were applied to examine the kinetics of the adsorption. The results showed that kinetic data were followed more closely the pseudo-second order model than the pseudo-first order. The thermodynamic parameters such as, equilibrium constant (K), Gibbs free energy changes (DeltaG degrees ), standard enthalpy change (DeltaH degrees ) and standard entropy change (DeltaS degrees ) had been determined. The results show that adsorption of phenol on BPC is an endothermic and spontaneous in nature.

[1]  A. P. Terzyk,et al.  Further insights into the role of carbon surface functionalities in the mechanism of phenol adsorption. , 2003, Journal of colloid and interface science.

[2]  T. Kojima,et al.  Removal and recovery of phenol from FCC effluent , 1995 .

[3]  N. Pinto,et al.  Ideal adsorbed phase model for adsorption of phenolic compounds on activated carbon , 1997 .

[4]  Irving Langmuir.  THE CONSTITUTION AND FUNDAMENTAL PROPERTIES OF SOLIDS AND LIQUIDS. PART I. SOLIDS. , 1916 .

[5]  E. Halliop,et al.  Acidic and basic sites on the surface of porous carbon , 1997 .

[6]  J. Perrich.  Activated Carbon Adsorption For Wastewater Treatment , 1981 .

[7]  J. A. Mattson,et al.  Surface Chemistry of Active Carbon: Specific Adsorption of Phenols , 1969 .

[8]  W. E. Marshall,et al.  The use of nutshell carbons in drinking water filters for removal of chlorination by‐products , 2004 .

[9]  Vernon L. Snoeyink,et al.  Sorption of phenol and nitrophenol by active carbon , 1969 .

[10]  F. Tümen,et al.  Cd(II) adsorption from aqueous solution by activated carbon from sugar beet pulp impregnated with phosphoric acid , 2003 .

[11]  V. Goncharuk,et al.  Removal of organic substances from aqueous solutions by reagent enhanced reverse osmosis , 2002 .

[12]  R. Juang,et al.  Adsorption isotherms of phenols from water onto macroreticular resins. , 1999, Journal of hazardous materials.

[13]  Tomás Cordero,et al.  Phenol adsorption onto powdered and granular activated carbon, prepared from Eucalyptus wood. , 2004, Journal of colloid and interface science.

[14]  T. Viraraghavan,et al.  Adsorption of phenol from wastewater by peat, fly ash and bentonite , 1998 .

[15]  T. Bandosz,et al.  Role of surface chemistry in adsorption of phenol on activated carbons. , 2003, Journal of colloid and interface science.

[16]  Krishna Kadirvelu,et al.  Uptake of mercury (II) from wastewater by activated carbon from an unwanted agricultural solid by-product: coirpith , 1999 .

[17]  K. Kobe,et al.  Chemical engineering kinetics , 1956 .

[18]  S. Lagergren,et al.  Zur Theorie der sogenannten Adsorption gelöster Stoffe , 1898 .

[19]  Z. Aksu,et al.  A comparative adsorption/biosorption study of mono-chlorinated phenols onto various sorbents. , 2001, Waste management.

[20]  W. Kujawski,et al.  Removal of phenol from wastewater by different separation techniques , 2004 .

[21]  H. S. Altundoğan,et al.  Cr(VI) removal from aqueous solution by iron (III) hydroxide-loaded sugar beet pulp , 2005 .

[22]  Leema A. Al-Makhadmeh,et al.  Utilization of Raw and Activated Date Pits for the Removal of Phenol from Aqueous Solutions , 2004 .

[23]  Y. Ho,et al.  Pseudo-second order model for sorption processes , 1999 .

[24]  Foster Dee Snell,et al.  Encyclopedia of Industrial Chemical Analysis , 1975 .

[25]  K W Kolasniski,et al.  ZUR THEORIE DER SOGENANNTEN ADSORPTION GELÖSTER STOFFE. KUNGLIGA SVENSKA VETENSKAPSAKADEMIENS , 2001 .

[26]  A. Buekens,et al.  Water Treatment by Means of Activated Carbon, Prepared from Locally Available Waste Materials (II) , 1985 .

[27]  Daren E. Daugaard,et al.  Preparation of activated carbon from forest and agricultural residues through CO2 activation , 2004 .

[28]  A. Da̧browski,et al.  Adsorption of phenolic compounds by activated carbon--a critical review. , 2005, Chemosphere.

[29]  R. Coughlin,et al.  Role of surface acidity in the adsorption of organic pollutants on the surface of carbon , 1968 .

[30]  R. Juang,et al.  Pore structure and adsorption performance of the activated carbons prepared from plum kernels. , 1999, Journal of hazardous materials.

[31]  I. Langmuir.  THE CONSTITUTION AND FUNDAMENTAL PROPERTIES OF SOLIDS AND LIQUIDS , 1917 .