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超声辅助法制备银纳米球及其对亚甲基蓝的催化降解研究Ultrasonic Wave Assisted Synthesis of Silver Nanospheres and Their Catalytic Degradation on Methylene Blue
戴策, 李庆, 覃礼钊, 林华, 聂明, 李元
银纳米球, 超声辅助, 亚甲基蓝, 催化降解Silver Nanospheres, Ultrasonic Wave Assisted, Methylene Blue, Catalytic Degradation
《Advances in Analytical Chemistry》, Vol.5 No.2, 2015-05-07
A facile environmental friendly method has been developed to prepare silver nanospheres with good dispersion and the size in the range of 300 - 400 nm. Silver nanospheres were obtained via the chemical reduction of Tollens’ reagent at room temperature, using ascorbic acid as the reducing agent and polyvinylpyrrolidone (PVP) as the surfactant. The obtained silver nanospheres were characterized by X-ray powder diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM) and UV-visible spectroscopy (UV-vis). The influence of reaction time and the amount of PVP and ammonium hydroxide on the formation of silver nanospheres was studied. The growth process of silver nanospheres was analyzed and the possible mechanism of crystal growth was proposed. The catalytic degradation activity of the obtained silver nanospheres on methylene blue was also measured. They showed excellent catalytic degradation activity on methylene blue.