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| Controllable synthesis of Au-Ag alloy nanoparticles and their photocatalytic properties |
| SUN Li, WANG Fa, LÜ Peng-cheng, LI Hao-nan, SU Wen-xian, ZHANG Li-xin |
| School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China |
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Abstract Au-Ag alloy nanoparticles (NPs) less than 14.6nm in size were synthesized using fructose as reductant and surfactant. Au-Ag alloy NPs were continuously obtained by changing the synthesis time from 1 to 8 min in one-pot. Au-Ag alloy NPs were characterized by means of UV-Vis, EDX, ICP, XPS, TEM, HR-TEM and SAED analyses. It was found that Au-Ag alloy NPs had homogeneous composition and alloy microstructure. As-prepared Au-Ag alloy NPs exhibited a superior photocatalytic activity and stability for 4-nitrophenol degradation due to the synergistic effect between Au and Ag elements. The kinetic rate constant of 4-nitrophenol degradation could be controlled linearly by the composition of Au-Ag alloy NPs besides their addition amount. Based on the controllable synthesis of Au-Ag alloy NPs, the kinetic rate constant could even be adjusted linearly by their synthesis time. The above methods to control the kinetic rate constant provide promising routes for other photocatalytic reactions.
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Received: 06 December 2017
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