In-situ synthesis of high stable CdS quantum dots and their application for photocatalytic degradation of dyes.
In-situ synthesis of high stable CdS quantum dots and their application for photocatalytic degradation of dyes.
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DOI：
10.1016/j.saa.2015.07.052
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
A. Samadi‐Maybodi;M. Sadeghi-Maleki
中科院分区：
文献类型：
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作者：
A. Samadi‐Maybodi;M. Sadeghi-Maleki
基于半导体量子点的光催化利用太阳能，可用于去除水介质中的污染物，并应用于水净化。本文以Na 2S 2 O3为前驱体，巯基乙酸（TGA）为催化剂，在水溶液中加入封端剂，采用一种简单的原位法成功合成了具有良好光学性能的高稳定性CdS量子点。采用2 IV 7-3部分析因设计法对合成工艺进行了优化。以茜素、酸性紫、媒介红和百里酚蓝等工业染料为降解对象，考察了CdS量子点的光催化活性。结果表明，所合成的CdS量子点在可见光照射下能够降解有机染料，并具有良好的循环稳定性。利用TEM、XRD、吸收光谱和荧光光谱等技术研究了CdS量子点的结构和光谱性质。合成的TGA-帽的CdS量子点具有立方晶体结构的尺寸在2.65-2.93 nm的范围内。
Photocatalysis based on semiconductor quantum dots, which utilize the solar energy can be used for elimination of pollutants from aqueous media and applied for water purification. In this paper, high stable CdS quantum dots (QDs) with good optical properties were successfully synthesized in a facile in-situ method, using Na 2 S 2 O 3 as precursor and thioglycolic acid (TGA) as a catalyst, as well as capping agent in aqueous media. The synthesis process was optimized with a 2 IV 7–3 fractional factorial design method. Then, we studied the degradation of some industrial dyes including: alizarin, acid violet, mordant red and thymol blue as a tool to check the photocatalytic activity of synthesized CdS QDs. Results specified that the synthesized CdS QDs are capable for degradation of organic dyes under visible light irradiation with good recycling stability during photocatalytic experiments. Structural and spectroscopic properties of the synthesized CdS QDs were studied by TEM, XRD and absorption and fluorescence spectroscopy techniques. The synthesized TGA-capped CdS QDs have sizes in the range of 2.65–2.93 nm with cubic crystalline structures.