Sorption of Pb Metal Using Bottom Ash as a Low Cost Sorb entReportar como inadecuado




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Recently, adsorption through the use of natural or recycled material is considered to be a low-cost alternative to remove heavy metals from wastewater. This study investigates the potential of coal bottom ash to be used as an adsorbent for the removal of lead Pb from aqueous solutions. The physical and chemical characteristics of bottom ash were determined and a series of batch leaching and adsorption experiments were performed to determine efficiency of the adsorbent material. The adsorption capacity was determined as a function of the particle size, specific surface area and contact time. The rate of extent of adsorption is dependent on the specific surface area and particle size of the adsorbent wherein the adsorption rate increased as particle size decreased. Several kinetic models Lagergren first-order, pseudo-second order and Elovich equation as well as isotherm models Langmuir and Freundlich were applied to the experimental data. The pseudosecond order was found to be the most suitable model describing the adsorption of Pb. On the analysis of equilibrium isotherms, Langmuir isotherm was found to be the best representative for Pb-sorption on bottom ash.

KEYWORDS

adsorption; bottom ash; isotherms; kinetics; leaching; lead

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Autor: Joan B. Gorme, Marla C. Maniquiz, Soon Seok Kim, Young Gyu Son, Lee-Hyung Kim

Fuente: http://www.scirp.org/



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