Adsorption of Pb(II), Zn(II) and Cr(III) on coal fly ash porous pellets

Abstract In the present work the application of fly ash porous pellets as adsorbent of lead(II), zinc(II) and chromium(III) ions from aqueous solution was studied. Experiments were carried out using porous pellets developed from fly ash derived from Megalopolis, Greece coal-burning power plant. The material was shaped into spherical agglomerates, after wetting and tumbling in a laboratory scale granulator. The adsorption of heavy metals on fly ash pellets was studied as a function of the initial metal concentration, solution pH and temperature. Kinetic studies indicated that sorption follows a pseudo-second-order model. Adsorption isotherms of lead, zinc and chromium were determined for agglomerated material using the Langmuir equation. The adsorption capacity of fly ash pellets reached at 0.22 mmol Pb/g pellet, 0.27 mmol Zn/g pellet and 0.44 mmol Cr/g pellet. Furthermore adsorption from bimetallic solutions (Cr–Zn, Cr–Pb and Pb–Zn) took place in order to study presumable antagonistic effects on adsorption of heavy metals. Finally, the stabilization of metal saturated pellets was studied. The stabilization procedure took place in structures made of concrete, where 75% of cement was replaced by raw fly ash. The evaluation of the procedure through leaching tests showed excellent heavy metals stabilization in concrete blocks.

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

[2]  E. Tütem,et al.  Heavy metal cation retention by unconventional sorbents (red muds and fly ashes) , 1998 .

[3]  R. Mark Bricka,et al.  A review of potentially low-cost sorbents for heavy metals , 1999 .

[4]  Tonni Agustiono Kurniawan,et al.  PHYSICO-CHEMICAL TREATMENT TECHNIQUES FOR WASTEWATER LADEN WITH HEAVY METALS , 2006 .

[5]  S. Chaudhuri,et al.  Kinetics and mechanism of removal of 2, 4-dimethyl phenol from aqueous solutions with coal fly ash , 1995 .

[6]  B. Bayat.  Combined Removal of Zinc (II) and Cadmium (II) from Aqueous Solutions by Adsorption onto High-Calcium Turkish Fly Ash , 2002 .

[7]  V. Gupta,et al.  Removal of lead and chromium from wastewater using bagasse fly ash--a sugar industry waste. , 2004, Journal of colloid and interface science.

[8]  A. G. Bhole,et al.  Performance of low-cost adsorbents for the removal of copper and lead. , 2003 .

[9]  A. Adamson.  Physical chemistry of surfaces , 1960 .

[10]  E. Barrett,et al.  (CONTRIBUTION FROM THE MULTIPLE FELLOWSHIP OF BAUGH AND SONS COMPANY, MELLOX INSTITUTE) The Determination of Pore Volume and Area Distributions in Porous Substances. I. Computations from Nitrogen Isotherms , 1951 .

[11]  J. Pearce.  Burton’s Line in Lead Poisoning , 2006, European Neurology.

[12]  S. Banerjee,et al.  Removal of Nickel(II) and Zinc(II) from Wastewater Using Fly Ash and Impregnated Fly Ash , 2003 .

[13]  B. Bayat.  Comparative study of adsorption properties of Turkish fly ashes. II. The case of chromium (VI) and cadmium (II). , 2002, Journal of hazardous materials.

[14]  T. Chuah,et al.  Rice husk as a potentially low-cost biosorbent for heavy metal and dye removal : an overview , 2005 .

[15]  E. Barrett,et al.  The Determination of Pore Volume and Area Distributions in Porous Substances. II. Comparison between Nitrogen Isotherm and Mercury Porosimeter Methods , 1951 .

[16]  P. Cloirec,et al.  Removal of Cu2+ and Zn2+ in aqueous solutions by sorption onto mixed fly ash , 2001 .

[17]  C. Baes,et al.  The hydrolysis of cations , 1986 .

[18]  D. Mohan,et al.  >Removal of Lead from Wastewater Using Bagasse Fly Ash—A Sugar Industry Waste Material , 1998 .

[19]  A. G. Bhole,et al.  Removal of Cr6 + and Ni2+ from aqueous solution using bagasse and fly ash. , 2002, Waste management.

[20]  D. Panias,et al.  Copper and cadmium adsorption on pellets made from fired coal fly ash. , 2007, Journal of hazardous materials.

[21]  B. Bayat.  Comparative study of adsorption properties of Turkish fly ashes. I. The case of nickel(II), copper(II) and zinc(II). , 2002, Journal of hazardous materials.

[22]  A J Paine,et al.  Mechanisms of chromium toxicity, carcinogenicity and allergenicity: Review of the literature from 1985 to 2000 , 2001, Human & experimental toxicology.

[23]  K. E. Kacemi,et al.  A comparative study of the removal of trivalent chromium from aqueous solutions by bentonite and expanded perlite. , 2001, Journal of hazardous materials.

[24]  C. Colella,et al.  Chromium removal from water by ion exchange using zeolite , 1991 .

[25]  L. Charerntanyarak.  Heavy metals removal by chemical coagulation and precipitation , 1999 .