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removal of toxicants

Studies on adsorptive removal of toxicants from water

Anuradha Baghel, Beer Singh

Abstract


The objective of our study was to develop and explore the appropriate adsorbents for the removal of toxicants such as heavy metals, CN¯, E. coli, and chemical warfare agents (nerve agents and sulphur mustard) from water. The presence of toxicants in drinking water causes severe threats for living beings. Therefore, many adsorbents such as activated carbon, impregnated carbon, activated carbon spheres, bentonite loaded fabric strips, ion exchange resins, and molecularly imprinted polymers were studied for the elimination of toxicants dissolved in water. Out of them activated carbon and impregnated carbons are highly porous material and having high surface area in comparison to others while molecularly imprinted polymers show high selectivity towards imprinted ions. Stirring time, adsorbent amount and initial concentration of toxicants also affect their removal from water. Pb(II) adsorption on carbon obeyed first order in starting then followed pseudo second order kinetics. While SM adsorption on carbon from a mixture of methanolic water (1 : 1) was  pseudo first order with 5.04 X 10–3 min-1 rate constant and half life of adsorption reaction was 137.5 minutes. .


Keywords


Carbon; Adsorptive removal; Toxicants; Resins; Bentonited loaded fabric strips; Molecularly imprinted polymers; Kinetics

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