Removal of Lead Metal Ion from Aqueous Solutions Using Zinc Oxide Nanoparticles and Zinc Oxide Bulk Material
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Date
2011
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Uva Wellassa University of Sri Lanka
Abstract
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Many toxic heavy metals have been discharged into the environment as industrial wastes, causing Serious soil and water pollution. Toxic metal compounds coining to the earth's surface not only reach the earth's waters but can also contaminate underground water in trace amounts by leaking front the soil after rain. Therefore, drinking water obtained front springs which may also be contaminated by various toxic metals. Pb", Cu", Fe", and Cr"‘are especial I y common materials that tend to accumulate iii organisms, causing numerous ‹diseases and disorders (Inglizakis e/ at., 2002). Among these lead (Pb’ highly toxic heavymetal which adversely affects the red blood cells of the human nervous system and kidneys (Potgieter et al., 2006). According to World Health Organization, the maximum in permissible limit of lead in drinking water is 0.05 mg/L (Kanawade and Gaikwad, 201 I).
The adsorption of heavy metal ions onto various solid supports such as activated charcoals, ion exchange resins, zeolites and ion chelating agent’s immobilized on inorganic supports is the most common route among the different techniques applied to remove dissolved heavy metals front waste water and industrial effluents (Chen et al., 2003). Many methods using today for decontamination of waste water are not suitable iii developing countries due to the high costs associated with production. Therefore, the use of alternative low-cost materials us potential sorbents for the removal of heavy meals should be investigated.
Among inorganic nanoparticles, the zinc oxide (ZnO) nanoparticle has received great attention because of its unique catalytic, antibacterial, electrical, electronic and optical properties as well as its low cost and extensive applications (Kathirvelu el at., 2009). Zinc ox ide bulk materials and zinc oxide nanoparticles are widely used in industry and dai Iy life for various things including as absorbents for gases such as CO, CO, O , H2. SO„ CHP (Scarano et al., 2004). Therefore, the main aim of this study was to investigate the possibility of using ZnO nanoparticles and ZnO bulk material for the removal of Pb" from aqueous solutions by adsorption,
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Keywords
Environment science, Science & Technology, Bioprocess Technology, Environmental Engineering