Removal of Heavy Metal Ions From Water Bodies Using Mesoporous Silicates: A Silica Based Novel Hybrid Material
Journal Title: PARIPEX-Indian Journal of Research - Year 2016, Vol 5, Issue 9
Abstract
Heavy metals (Cadmium, Nickel, Lead and Chromium) which are natural components of the Earth’s crust are usually associated with toxicity. Exposure to heavy metals, even at trace level, is known to be a risk for human beings. The presence of zinc, cadmium, nickel and others metals in the aqueous environment has a potentially damaging effect on human physiology and other biological systems when the acceptable levels are exceeded. Heavy metals cannot be degraded or destroyed. Heavy metal toxicity could result, for instance, from drinking-water contamination (e.g. lead pipes), increased ambient air concentrations near sources of emission, or ingestion via the food chain. The increased use of heavy metals in industry has resulted in increased availability of metallic substances in natural water sources. Many technologies like adsorption, precipitation, membrane filtration, and ion-exchange have been used to remove metal pollutants from water. However, adsorption has proven to be economical and efficient for removing heavy metals, organic pollutants and dyes from polluted waters. Several adsorbents such as activated carbon, silica, and graphene can be used in the purification of water. Activated carbon has shown to be an efficient adsorbent for the removal of a wide variety of organic and inorganic contaminants present in the aquatic environment. Because of its high surface areas is widely used in the treatment of wastewaters. The effectiveness of Mesoporous silicates in cleaning up polluted water is due to its well developed porosity structure as well as the presence of a wide spectrum of surface functional groups. This makes it capable of distributing pollutants on its large internal surface, making them accessible to reactants.
Authors and Affiliations
Sandhya Sayantini Mohanty, Nilakantha Dash, S. P. Nanda, R. K. Dey
Keywords
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