本研究主要是想結合銀特殊之光學性質與氯的殺菌能力，使得觸媒在可見光下也能分解有機汙染物，透過改變不同的前驅鹽、保護劑、還原劑的濃度和溫度，希望能製備出粒徑單一可均勻分散的奈米銀，改變不同氯源之比例以合成之銀/氯化銀核殼結構，探討其對光催化效能之影響。
研究結果透過SEM、TEM、XRD、UV-Vis等儀器進行分析，以SEM和TEM觀察表面型態，以XRD分析光觸媒之晶相，以UV-Vis分析光觸媒之吸收波長，最後以相同莫耳數比的硝酸銀和三氯化鐵合成之光觸媒有最好的光催化活性，在300瓦的氙燈光源之下，以20mg的光觸媒降解50ml濃度為10ppm的羅丹明B，於20分鐘內降解率高達99%。

　　　The purpose of this study is to combine the specific optical activity of silver with the sterilization ability of chlorine, so that the photocatalyst can decompose organic pollutants under visible light. By changing different concentration of precursor salts、protective agents、and reducing agents and temperature，it is hoped to prepare a uniform dispersed nanosilver with a single particle size, changing the ratio of different chlorine sources to synthesized the silver/silver chloride core-shell structure, and discuss the effect on photocatalytic performance.
　　　The characteristic analysis of silver/silver chloride core-shell structure were performed by SEM、TEM、XRD、UV-Vis.From the SEM and TEM images,we can observe the surface morphology.From XRD images ,we can confirm the crystal lattice of photocatalyst. From the UV-Vis images,we can see the absorption wavelength of photocatalyst .Photocatalyst synthesized by silver nitrate and ferric chloride with the same molar ratio has the best photocatalytic activity . Under the xenon light source with 300 watt , a 20mg photocatalyst degradation in 50ml of Rhodamine B , which concentration is 10ppm.The decomposition rate can reach up to 99% in 20 minute.

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