Advantages of nano-silver-carbon covered alumina catalyst prepared by electro-chemical method for drinking water purification

The present work highlights the high efficiency of silver nano-particles deposited over carbon covered alumina (CCA), by electro-chemical deposition method over impregnation method, in controlling microorganisms in water. The anti-microbial activities of the catalysts are determined quantitatively by serial dilution followed by inoculation method. The catalytic characterization of these materials obtained by using transmission electron microscopy (TEM), X-ray diffraction (XRD) and temperature programmed reduction (TPR). TEM and X-ray line broadening technique results indicate the presence of Ag particles in nanometer size. The main advantage of Ag supported catalysts prepared by electro-chemical deposition over that made by conventional impregnation technique is that only small amount is needed and no pretreatment conditions like reduction are required for deactivation of microorganism in water. Thus, silver catalysts prepared by this method are not only efficient but also economical in restoring hydrogen economy. The combined characteristics of Al2O3 and carbon like low acidity, high mechanical strength and presence of meso pores in CCA are also helpful for getting good activity.

Graphical abstractThe present work highlights the high efficiency of silver deposited on carbon covered alumina (CCA) by electro-chemical (EC) deposition method over conventional impregnation method, in controlling the microorganisms in water. Formation of uniform sized Ag nano-particles over CCA in EC method, combined characteristics of carbon and alumina in CCA and the advantage associated with EC method with no pretreatment conditions like reduction are the reasons for getting high activity.Figure optionsDownload full-size imageDownload as PowerPoint slide