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Preparation and Photocatalytic Properties of CdS and ZnS Nanomaterials Derived from Metal Xanthate

机译：金属黄原酸盐Cds和ZnS纳米材料的制备和光催化性能

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In this paper, we report a new, simple method for the synthesis of CdS and ZnS nanoparticles (NPs) prepared in a basic aqueous medium using metal xanthate as the sulfur source. The structure, morphology, size distribution, optical band gap, and photocatalytic properties of the newly obtained nanomaterials were investigated by UV-Vis spectroscopy, X-ray diffraction, and transmission electron microscopy. The results show that both CdS and ZnS crystallized in cubic phase and formed NPs with average sizes of 7.0 and 4.2 nm for CdS and ZnS, respectively. A blue shift of UV-Vis absorbance band and higher energy band gap values were observed for both materials in comparison with their bulk counterparts, which is in accordance with the quantum confinement effect. The as-prepared nanomaterials were tested in visible-light driven photocatalytic decomposition of methylene blue (MB). After irradiation for 180 min, the degradation rate of MB with a concentration of 8 × 10−6 mol/L mixed with a photocatalyst (CdS or ZnS, both 10 mg in 100 mL solution of MB) was found to be 72% and 61%, respectively. The CdS NPs showed better photocatalytic activity than ZnS, which could be explained by their lower energy band gap and thus the ability to absorb light more efficiently when activated by visible-light irradiation.
机译：在本文中，我们报告的CdS和ZnS纳米颗粒（NP）的合成中一个新的，简单的方法，使用金属黄原酸盐作为硫源在碱性水性介质中来制备。通过UV-Vis光谱法，X射线衍射和透射电子显微镜的结构，形态，粒度分布，光学带隙，并且新获得的纳米材料的光催化性能的影响。结果表明，二者的CdS和ZnS在立方相中结晶，并用7.0的平均尺寸和用于分别的CdS和ZnS，4.2纳米形成的NP。可见紫外吸收带和更高的能带隙的值，观察到两种材料的比较蓝移与它们的体积对应，这是根据量子限制效应。所制备的纳米材料在亚甲基蓝（MB）的可见光驱动光催化分解进行了测试。照射180分钟，MB的降解速率与光催化剂混合的8×10-6摩尔/ L的浓度（CdS或硫化锌，既10毫克在MB的100mL的溶液）后，发现是72％和61 ％， 分别。在CdS纳米颗粒表现出比的ZnS，这可以通过它们的较低的能量的带隙通过可见光照射激活时进行解释，并因此光更有效地吸收的能力更好的光催化活性。

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