Cadmium sulfide-graphitic carbon nitride nanocomposite was synthesized by pulsed laser ablation in liquid, and it was found from the results of optical and morphological characterizations that the proper anchoring of nanostructured cadmium sulfide on the nano-sheets of graphitic carbon nitride took place, which brought about the positive attributes such as enhanced visible light absorption and reduced photo-generated charge recombination, the key features required for an efficient photo-catalyst by solar light harvesting. The pulsed laser ablation in liquid method adopted for the synthesis of cadmium sulfide-graphitic carbon nitride has the following advantages: the shape and size of the synthesized particles can be controlled by altering the experimental parameters such as laser wavelength, pulse laser duration, the pH of the solution, the surfactants and the temperature of the solution, pulsed laser ablation in liquid method neither requires cumbersome equipment nor does it require intermediate chemicals and catalysts nor does it necessitate the post synthesis purification. The enhancement of photo-catalytic activity of cadmium sulfide-graphitic carbon nitride nanocomposite was tested for the photo-catalytic deactivation of Escherichia coli bacteria in water under visible light radiation. As anticipated, a significant improvement of photo-catalytic deactivation was observed, which is attributed to the enhanced and extended light absorption in the visible spectral region, and the formation of herterojunction between the semiconductors, which is instrumental in inhibiting the undesired recombination of photo-generated charge carriers. Quantitatively, the presence of cadmium sulfide on the graphitic carbon nitride surface contributed to a remarkable 129% increase of photo-catalytic degradation constant compared to pure graphitic carbon nitride, which resulted in the decrease of total depletion time of Escherichia coli from 156 min to 67 min with the cadmium sulfide-graphitic carbon nitride nanocomposite synthesized by pulsed laser ablation in liquid method. Our results on the efficient photo-catalytic deactivation of Escherichia coli under visible light assures that cadmium sulfide-graphitic carbon nitride nanocomposite can very well be used for photo-catalytic water purification by harvesting the abundant solar light.

中文翻译：

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可见光活性硫化镉-石墨氮化碳纳米复合材料的合成，表征和评估：用于灭活水性病原体的前瞻性太阳光收集光催化剂。

通过脉冲激光烧蚀在液体中合成了硫化镉-石墨氮化碳纳米复合材料，并且从光学和形态学表征的结果中发现，纳米结构化硫化镉在石墨氮化碳纳米片上的适当锚固发生了，关于诸如提高可见光吸收和减少光生电荷复合等积极属性的研究，这些都是通过光收集获得有效光催化剂所必需的关键特征。用于合成硫化镉-石墨氮化碳的液体脉冲激光烧蚀方法具有以下优点：可以通过改变实验参数如激光波长，脉冲激光持续时间，pH值来控制合成颗粒的形状和大小。解决方案 液体方法中的表面活性剂和溶液的温度，脉冲激光烧蚀既不需要繁琐的设备，也不需要中间化学品和催化剂，也不需要后合成纯化。测试了硫化镉-石墨氮化碳纳米复合材料光催化活性的增强，用于可见光辐射下水中大肠杆菌的光催化失活。如预期的那样，观察到了光催化失活的显着改善，这归因于可见光谱区域中光吸收的增强和扩展，以及半导体之间的异质结的形成，这有助于抑制不希望的光重组。产生的电荷载体。数量上，与纯石墨氮化碳相比，石墨氮化碳表面上硫化镉的存在使光催化降解常数显着增加了129％，这导致大肠杆菌的总耗竭时间从156分钟减少到67分钟。脉冲激光烧蚀液相法合成硫化镉-石墨氮化碳纳米复合材料。我们在可见光下对大肠杆菌进行有效的光催化失活的结果确保了，硫化镉-石墨化碳氮化碳纳米复合材料可以很好地用于光催化水净化，因为它可以收集大量的太阳光。脉冲激光烧蚀液相法合成的硫化镉-石墨碳氮化碳纳米复合材料可将大肠杆菌的总耗时从156分钟减少到67分钟。我们在可见光下对大肠杆菌进行有效的光催化失活的结果确保了，硫化镉-石墨化碳氮化碳纳米复合材料可以很好地用于光催化水净化，因为它可以收集大量的太阳光。脉冲激光烧蚀液相法合成的硫化镉-石墨碳氮化碳纳米复合材料可将大肠杆菌的总耗时从156分钟减少到67分钟。我们在可见光下对大肠杆菌进行有效的光催化失活的结果确保了，硫化镉-石墨化碳氮化碳纳米复合材料可以很好地用于光催化水净化，因为它可以收集大量的太阳光。