Synthesis Of Cu₂ZnSnS₄ Nanoparticles And Its Ability Of Photocatalytic Water Splitting And Pollutant Degradation

The energy crisis, environmental pollution and solar energy are focused on this paper. We have explored the preparation methods and application of Cu2ZnSnS4. As the suitable semiconductor material for using solar energy, Cu2ZnSnS4 has demonstated outstanding property in the field of thin-film solar cells. But the current methods for preparing this material still has some problems such as, high research and development costs, complex operation, and difficult to control the reaction conditions and so on. Therefore, this paper is committed to develop a low cost, high efficiency good control ability way to prepare the Cu2ZnSnS4 material. we also have investigated the possible photocatalytic reaction mechanism and application of photocatalytic water splitting and pollution degradation of Cu2ZnSnS4 and the way to improve photocatalysis efficiency. The photocatalyst with advantages described above means important significance for relieving and solving the energy crisis, environmental pollution in the future.In this paper, we investigated the microwave fabrication of Cu2ZnSnS4 nanoparticles. In order to find a more convenient and efficient experimental method for preparing a highly reproducible spherical nanoscale Cu2ZnSnS4 photocatalyst, extensive efforts have been paid to selection of raw materials, reaction conditions, purification and characterization of the product and the test system. Finally, we obtained the optimum conditions to fabricate the Cu2ZnSnS4 photocatalyst, which was characterized by Scanning electronmicroscopy(SEM), X-ray diffraction(XRD), Transmission electron microscopy(TEM) and Raman spectroscopy(Raman) to characterize its structure and physical properties and analyze crystal type of analysis, grain size and purity.The well-shaped Cu2ZnSnS4 nanoparticles have showed the outstanding photocatalytic activity after completing experimental research of photocatalytic water splitting and pollution degradation. Specially, it has higher photocatalytic activity with the help of H2O2.The methylene blue aqueous solution were degraded 35.6% without adding any sacrifice agent. When added the degradation up to 97.3%, The first-order reaction rate constant k toward the degradation of methylene blue aqueous solution ranging from K=0.027/min to K=0.039/min. The prepared Cu2ZnSnS4 nanoparticles also showed the good photocatalytic performance with the assist of Na2 S, Na2SO3, the hydrogen evolution rate is 7 μmol/h/g, and we also study the properties of Cu2ZnSnS4/ grapheme.