REMOVAL OF CHROMIUM FROM DRINKING WATER BY USING SODIUM ALUMINATE MATERIAL

摘要

In the present investigation, an attempt has been made to prepare sodium aluminate type material by heat treatment method, in which highly porous smaller particles are formed adequately. The synthetic material, thus formed has been utilized for chromium - VI adsorption study. The investigation revealed that the synthetic materials could provide a high adsorption property for Cr (VI) uptake and it could be possible to remove 98% of Cr (VI) from the contaminated sources using sodium aluminate (activated) as the adsorbing medium. The adsorption process has been optimized using different concentration of Cr (VI) in the water medium at various solid-liquid ratio. It has been concluded that by using 20 mg/L Cr (VI), at solid: liquid ratio 4:10, it is possible to extract about 99% of contaminated Cr (VI), from different water sources. In addition to the above, the thermodynamic parameters such as kinetics, chemical equilibrium, order and rate of the reaction are determined. The study revealed that Cr (VI) is activated by chemo-sorption method with a 1~(st) order reaction rate. The process follows Freundlich isotherm where ionic exchange takes place extensively.