Luminescent and photocatalytic properties of cadmium sulfide nanoparticles synthesized via microwave irradiation
Luminescent and photocatalytic properties of cadmium sulfide nanoparticles synthesized via microwave irradiation
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DOI：
10.1016/j.matchemphys.2004.10.028
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发表时间：
2005-03
影响因子：
4.6
通讯作者：
Huaming Yang;Chenghuan Huang;Xianwei Li;Rongrong Shi;Ke Zhang
中科院分区：
文献类型：
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作者：
Huaming Yang;Chenghuan Huang;Xianwei Li;Rongrong Shi;Ke Zhang
采用微波辐射法成功地合成了粒径约为6 nm的硫化镉（CdS）纳米粒子。所制备的样品形貌均匀，纯度高。在300 nm激发波长下，CdS纳米粒子的红色光致发光光谱在602 nm处有一个强峰。研究了紫外光照射下CdS悬浮液对橙子的光催化氧化。结果表明，低pH值（pH 2.0）和低反应温度（20-30°C）将促进MeO溶液的脱色。随着溶液pH值和温度的升高，光降解程度降低。由于元素Cd在CdS表面的存款降低了光催化活性，使回收的CdS半导体的光催化效率降低。初步探讨了CdS纳米粒子的发光和光催化机理。微波辐射法是一种简便、高效、环境友好的一步合成纳米粒子的方法。
Uniform cadmium sulfide (CdS) nanoparticles of about 6nm in crystal size have been successfully synthesized via microwave irradiation. The as-prepared sample has a uniform morphology and high purity. The red photoluminescence spectrum of the CdS nanoparticles displays a strong peak at 602nm by using a 300nm excitation wavelength. The photocatalytic oxidation of methyl orange (MeO) in CdS suspensions under ultraviolet illumination was investigated. The results indicate that a low pH value (pH 2.0) and low reaction temperatures (20–30°C) will facilitate the decolorization of the MeO solution. The photodegradation degree decreases with increasing the pH value and temperature of solution. The efficiency of the recycled CdS semiconductor becomes lower due to the deposit of elemental Cd on the CdS surface, which weakens the photocatalytic activity. The luminescent and photocatalytic mechanisms of the as-prepared CdS nanoparticles were primarily discussed. Microwave irradiation is proved to be a convenient, efficient and environmental-friendly one-step route to synthesize nanoparticles.