Preparation Of Novel ZnS/CdS-C Nanocom-Posite And Its Application In The Removal Of Contaminants

All of the countries are facing energy crisis and environmental pollution problems due to the acceleration of industrialization process. Semiconductor material has been given rise to attention of scientists because of its excellent performance. Metal sulfide semiconductor nano material ZnS and CdS have been widely attention due to their great photocatalytic performance. The presence of high energy-consuming, complex process method of producing metal sulfides present;the resulting material is low purity, low crystallinity, and poor dispersion. Meanwhile, ZnS and CdS inherent low activity, poor stability.Therefore, this organic-inorganic layered hydroxide as precursor for preparing high activity, high stability, high dispersion of ZnS/CdS-HBA and ZnS/CdS-C nanocomposite by a simple, inexpensive, controlled way and degradation of pollutants photocatalytic made inquiry. The main contents and conclusions are as follows:1. Using layered hydroxide zinc benzoate (BA) intercalated (Zn (OH) BA) nanorods as a precursor; in situ solid reaction to vulcanize ZnS-HBA nanorods. Using cation exchange to acquire the one-dimensional ZnS/CdS-HBA nanomaterials. one-dimensional ZnS/CdS-HBA nanomaterials diameter of nanorods about 300 nm and 50 ?m long, ZnS and CdS particle diameter of about 5 nm. XPS and FTIR showed that a large number of functional groups on the sample surface.They have a strong interaction via COO-Zn bond. ZnS and CdS uniformly dispersed in a nano-dimensional HBA array.2.1D ZnS/CdS-C nanorods can be obtained by one step solid pyrolysis one-dimensional ZnS/CdS-HBA nanocomposites. We made a detailed characterization for 1D ZnS/CdS-C nanocomposite. The results showed that the sample length of about 50 ?m, a diameter of about 300 nm. The nanorods are constitutd by ZnS CdS and C (particle size of about 10nm). XPS and FTIR showed that ZnS and C have a strong interaction via C-O-Zn bond. HRTEM results showed that ZnS and CdS uniformly dispersed high crystallinity, formed in close contact heterojunction can promote photogenerated electron-hole separation. UV-Vis show that the samples have absorption in ultraviolet and visible region. Different calcination temperature on the morphology and structure of the material has been studied. As the calcination temperature (400-800?), the degree of graphitization of carbon continues to increase, the particle size of the material surface becomes larger than the surface area decreases, the degree of crystallinity is improved. N2 adsorption-desorption curve shows the sample surface area 169.2 m2/g dropped to 37.5 m2/g.3. One-dimensional ZnS/CdS-C complex nanomaterials in the whole spectrum of different kinds of light catalytic degradation of organic dyes (methylene blue, rhodamine B, Orange II, Evans blue, Congo red) showed a very high light catalytic activity(as good as P25) and stability. Catalytic activity is much higher than without CdS photocatalytic activity of ZnS-C. The pH value of an aqueous solution of the dye from 2 to 11, with no significant effect on the photocatalytic properties of the material. The repeated experiment indicate that the material has good stability and easy to recover. In this paper, the relationship between structure and properties of materials made inquiry. 1D ZnS/CdS-C complex nanomaterials have a good application in industrial sector.