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In this work, cadmium sulfide (CdS) is used as a visible-light responsive photocatalyst with a narrow band gap (2.42 eV). CdS nanorods were synthesized by a facile and rapid microwave-assisted method and Au dots were decorated on the surface by a reduction method. The additions of the Au dots hinder the recombination of electron-hole pairs and enhance the photocatalytic activity under visible light. The photocatalytic activity of the Au/CdS nanorods was evaluated by the photodegradation of methylene blue (MB) under visible light irradiation (455 nm LED lamp). The photocatalytic efficiency of Au/CdS nanorods is compared to conventional TiO 2 (P25) and CdS-A prepared by an autoclave method, and an improvement of the Au/CdS system, attributed to the reduced band gap energy (2.31 eV) and enhanced absorption in the range of 400 to 800 nm, was observed. The calculated mineralization ratio of MB by Au/CdS nanorods was higher compared to the data presented in the literature. This facile and efficient synthesis route may promote the utilization of Au/CdS nanorods as visible light photocatalysts. Experimental section Microwave-assisted synthesis of CdS nanorodAll source materials purchased from Sigma-Aldrich were of analytical grade and utilized as-received without further

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A critical need in the field of nanotechnology is the development of a sustainable and eco-friendly process for the synthesis of metallic nanoparticles (NPs). To accomplish this, the use of live plants becomes essential for the production of low-cost, energy-efficient, and nontoxic metallic NPs. In this study, we tried in-vivo synthesis (green synthesis) of silver and gold NPs using seeds of bean, radish, and alfalfa, which were grown hydroponically in aqueous solutions containing metal salts, 20-25 nm sized NPs were found on the inner surfaces of the plants' vascular cylinders and cortex. The amounts of NPs taken up by the intracellular systems were clearly dependent on the exposure time and concentration of the metal salts. Although these results regarding the green synthesis of NPs on the growth of plant species are somewhat interesting and effective, metal salts adversely affected the root growth of the plants. Silver ions in the growth media showed a more negative impact on root growth compared to gold ions. Therefore, even though biosynthesis of metal NPs using live plants is considered as green synthesis, we have to consider their phytotoxicity on plant growth.

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