CHEAP, ECO-FRIENDLY amp; SCALE UP COMBUSTION DERIVED POROUS, ULTRA-LIGHT MGO AND ZNO NANOCRYSTALLINE POWDERS FOR THE REMOVAL OF FLUORIDE AND AS(III)/ AS(V)SPECIES FROM CONTAMINATED WATER

摘要

This invention relates to a process for the removal of fluoride and arsenic contents from drinking water using combustion derived macro porous, ultra-light surface active MgO and ZnO nano crystalline powders with large surface area having a high adsorptive capacity and a high rate of adsorption with respect to fluoride and As(III) As(V) contaminants, comprising, preparing MgO and ZnO nano particles by SCS wherein aqueous solution containing stoichiometric amount of magnesium or zinc nitrate as oxidizer and sugar as fuel are taken in a pyrex dish (corresponding to equivalent stoichiometric ratio of oxidizer to fuel (O/F) Φe =1.0), introducing pyrex dish into muffle furnace maintained at 450 ± 10 °C and boiling the redox mixture wherein viscous gel in being formed, allowing it at the same temperature in the muffle furnace for 10 mins till it turns white, taking 100 ml of synthetic/standard solution/ground water containing fluoride and As(III)/As(V) and adding a known quantity 0.05g of as made adsorbents (MgO powder for both fluoride and Arsenic) and ZnO powder for Arsenic only, stirring for 10 min, sedimenting for 20 mins. Filtering.