Influence of silica spray coating from rice husk ash on Pb, Cu, and Zn metals toward growth of Staphylococcus Aureus and Escherchia Coli bacterium

Abstract

Synthesis of amorphous Silica from rice husk ash as a coatin°g on Pb, Cu, Zn metals to prevent growth of bacterium on it has been carried out by co-precipitation method. There are two variables of rice husk ash, first one was pure rice husk ash and the second one it was immersed in HCl. Resulted silica was characterized by X-ray diffraction (XRD) and X-ray fluorescence (XRF). Based on XRD data, both Silica of pure rice husk ash and immersed HCl have same pattern. They have peak (2θ) at 22.16°, indicates it formed amorphous Silica. XRF data clarified that percentage of Silica on both sample were 78.7% and 85.5% respectively. Silica powder was dissolved in Ethanol with ratio of Silica and ethanol were 1:10 and 1:100. Silica solution was sprayed on Pb, Cu, and Zn metals and Staphylococus Aureus and Escherchia Coli Bacterium was grown on it. Based on observation of bacterium growth showed that rate of bacterium growth decreases when Silica was coated on metal than without coating.