PREPARATION OF NANODIMENSIONAL SILVER METAL AND APPLICATION FOR DRINKING WATER TREATMENT
Abstract
A long time ago, silver was used as a sterilizing substance. In the dispersed nanodimensional form, the bacterial removing ability of silver was anomaly increased. Those were proved in this investigation. High dispersed nanodimensional silver metal was prepared from silver nitrate solution of concentration of lO"* to 10"^ M in water, water-ethanol media alkalified by ammonium hydroxide. Reductive reagent used was hydroxylamine, glucose or formaldehyde and dispersing reagent was polyvinylalcohol. Prepared nanodimensional silver metal solution had characteristic yellow to brown color. The nanodimensional silver was used as a direct sterilizing reagent or coating on silica gel grains to create sterilizing layer in bacterial removing filter for drinking water. The investigation results showed that 10 mm thick layer of silica gel coated nano silvercould remove all bacteria in water current wich flowed though it with maximum flow rate of 100 LmVmin. The material was nontoxic and applicable for drinking water treatment.