جستجوی مقالات مرتبط با کلیدواژه "photoreduction" در نشریات گروه "شیمی"

In the past two decades, quest of finding sustainable and environment friendly energy sources has increased enormously. Fuel cell technology has seen exciting growth for the solution of requirement of sustainable energy. Fuel cells are based on electrochemical reactions to change chemical energy into electrical energy. For this, reduction of CO2 and O2 are two of the important reactions. Despite quite stable nature of CO2, its reduction can be achieved effectively in presence of catalyst. Both the CO2RR and ORR reactions yield useful byproducts like water, formic acid, formaldehyde, methanol etc. Earlier Pt based catalysts were in use for these conversions in fuel cells. In the recent years, polyaza macrocycle-based catalysts are being applied as these being cost effective. For both above-described purposes, polyazamacrocyclic complexes, like metalloporphyrin, phthalocyanine, have been proved to be very effective. This article is focused mainly on recent advancement in Tetra, Penta and Hexaazamacrocyclic complexes for CO2 RR and ORR reactions.

This paper deals with the study on the antibacterial activity of TiO2-doped Ag prepared from radiophotography wastewater. The antibacterial agent was prepared by reduction of Ag(I) in the radiophotography wastewater over TiO2 photocatalyst under UV light irradiation and characterized by EDS, XRD, SRUV, and TEM machines. The antibacterial activity in inhibiting the growth of Staphylococcus aureus was examined by counting the number of viable bacterial colonies using the TPC method. The result shows that Ag doping on TiO2 as TiO2-Ag can shift its absorption into the visible region. TiO2-Ag assigns better antibacterial activity compared to TiO2 under visible light irradiation. The efficiency of the antibacterial activity is found to be influenced by Ag loaded in the TiO2, irradiation time, and the antibacterial agent dose. The highest antibacterial activity is achieved by 100 mg/L of TiO2-Ag (2) under 3 h irradiation by visible light.