Synthesis Of Sb₂S₃/Sb₄O₅Cl₂ Composites With Three-dimensional Spherical Structures And The Application For Photocatalytic Performance

With the development of indurstry and the ignorance of environmental protection, environment problem has become more and more serious. And owing to the improper discharge of industrial wastewater, the water environment is deteriorating day by day. Among of them, dye wastewater because of its high chroma, large organic pollutant concentration, complexed composition and biological toxicity has become a major problem of water pollution control. To address this issue, various methods were tried. Photocatalytic technology, compared with traditional methods, is green, low-cost and effective in the degradation of dye. Owing to its unique advantages, photocatalytic technology has attract extensive attention of scholars and researchers. Therefore, the preparation of the corresponding semiconductor materials has become a hot spot in the field of materials.In this study, three-dimensional spherical Sb2S3/Sb4O5Cl2 microcrystallines were firstly synthesized via a facile hydrothermal process without any oxychlorides at 100 ℃. This is Sb2S3/Sb4O5Cl2 composites was successfully prepared for the first time. And it is also Sb2S3 and antimony compounds of the first successful composition. The major work and results included three parts.In the first part, a simple, mild and environmental(without any oxychlorides) hydrothermal method, based on the reactions of antimony trichloride and different dosages of sodium suifide in water at 100 ℃ for 12 h, is employed for the synthesis of Sb2S3/Sb4O5Cl2 microspheres with building units of one-dimensional nanostructure-based blocks and rods. Sb2S3/Sb4O5Cl2 were characterized by X-ray Diffractor(XRD), X-ray Photoelectron Spectroscopy(XPS), energy dispersive X-ray(EDX) and High-resolution transmission electron microscopic(HRTEM). Scanning electron microscopy(SEM) and Element Mapping studies revealed that the irregularly shaped nanoblocks self-organized into spherical assemblies. The results showed that three-dimensional spherical Sb2S3/Sb4O5Cl2 microcrystallines were successfully synthesized.The second part investigated that the suitable preparation conditions of Sb2S3/Sb4O5Cl2 including p H, suitable temperature, hydrothermal process, the concentration of HCl and Na OH. Furthermore, the mechanisms in the combination of Sb2S3/Sb4O5Cl2 composites and the possible mechanistic pathway in the formation of the spherical structures were also studied. The results showed that the mechanism in the combination of Sb2S3/Sb4O5Cl2 composites is an anion exchange strategy, and Sb2S3/Sb4O5Cl2 composites organized into unenclosed microspheres via the oriented attachment mechanism.The third part investigated the optical property and photocatalytic activity of three-dimensional spherical Sb2S3/Sb4O5Cl2 microcrystallines. The charateration of optical property included UV spectra, BET and PL. The photocatalytic activity of Sb2S3/Sb4O5Cl2 was studied through the degradation of methyl orange(MO) and methylene blue(MB). The results showed that the Sb2S3/Sb4O5Cl2 samples exhibited a suitable bad gap between 2.45 and 2.83 e V. And the as-prepared materials had an excellent visible light photoactivity for MO and MB degradation. 83.7% MO could be removed in 60 min, and 88.2% MB could be removed in 60 min, respectively.In sum, three-dimensional spherical Sb2S3/Sb4O5Cl2 microcrystallines firstly synthesized is believed that this composite may be the potential optoelectronic material.