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AuAg-Pd double-metallic core-shell nanoparticles for enhanced visible-light photocatalytic activity. A series of double-metal AuAg-Pd core-shell nanoparticles (NPs) with different shell thicknesses has been fabricated and then tested for visible-light photocatalytic degradation of a target pollutant (ciprofloxacin). A uniform AuAg-Pd NPs was synthesized by a seed-mediated method in aqueous solution under mild conditions. The single crystal cubic AuAg NPs were first prepared and then used as seeds for the growth of AuAg-Pd double-metallic NPs with different shell thicknesses. The catalytic properties of these double-metallic AuAg-Pd core-shell NPs for the photocatalytic degradation of ciprofloxacin were investigated by photoirradiation under visible light (λ > 420 nm) in a batch reactor. It was found that the ciprofloxacin degradation was obviously enhanced by increasing the shell thickness, and the optimal shell thickness of the double-metal NPs was determined as 3 nm. The shell thickness was directly related to the reaction temperature, which increased with the increased reaction temperature. For the shell thickness of 3 nm, the NPs showed the maximum photocatalytic performance with a degradation efficiency of 99.6% for ciprofloxacin in 60 min at 80 °C. The apparent quantum efficiency increased from 5.6% for the single AuAg NPs to 19.3% for the double-metal NPs. Electron-hole pair recombination decreased in the double-metal NPs due to the prevention of charge transfer and charge separation in the single-metal and the shell-shell interfaces.U.S. Pat. No. 4,452,047, which is incorporated herein by reference, describes a vacuum oven having two parallel ovens joined by an overhead conveying means along the oven length that supports and transports product in an independent path of travel in each of the ovens. Each oven has a generally circular oven end wall with an inner surface and an outer surface, the inner surface is textured to support the product. The inner surface has an upper region and a lower region, the upper region is heated by an upper oven heating element to a temperature of F., the lower region is heated by a lower oven heating element to a




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