The Synthesis Of CdS/Ti-MOF Photocatalyst And Their Photocatalytic Degradation Performance

Photocatalysis has been considered as a realistic and green solution for the overwhelming environmental and energy crisis. Photocatalysis technology can be applicated for the decontamination of diverse pollutants and water splitting, meeting the needs of sustainable development. CdS has narrow bandgap and perfect band position which arises intensive research interest. The research shows that the photocatalytic activity can be enhanced through fabricating hier archical structures, accrediting to higher light harvesting, larger surface-to-volume ratio, more reaction sites, and the separation of charge carriers. In recent year, it has been reported that the phase and the morphology of semiconductor can be controlled by the inorganic salt. Thus this research choose CdS as the object and tried to building CdS hierarchical structure and fabricatong CdS-based composite material, employing X-ray diffraction, scanning electron microscope, transmission electron microscope and the photocatalysis degradation of organic dye to study their growth mechanism and photocatalysis properties.Solution of sodium chloride has been used as a solvent to fabricate CdS hierarchical structure in hydrothermal condition. Series of CdS hierarchical structures has been obtained by changing the saturation of sodium chloride solution. The CdS hierarchical structures have enchanced photocatalysis performance and improved stability. When the concentration of sodium chloride solution is 60% of its saturation concentration, flower-like CdS-60% is obtained. Flower-like CdS-60% is fabricated from single-crystal CdS nanosheets proved by the TEM. Nevertheless, CdS-60% performs best in photocorrosion inhibition.Ti-MOF is a class of organic-inorganic hybrid material, consisting of titanium ion, titanium-oxo clusters and terephthalic acid linkers. Its porous nature, high surface area and its excitation upon ultraviolet light have resulted in possible application as photocatalyst. Ti-MOF behaves as a semiconductor photocatalyst with a wide band gap. This research choose Ti-MOF to couple with CdS forming a composite photocatalyst which can perform higher photocatalysis activity; then, discuss its photocatalysis mechanism by the UV-Vis DRS, PL spectrums and Mott–Schottky.CdS/Ti-MOF is synthesized by a facile one-pot solvothermal method with uniform cube morphology. Moreover, cube-like Ag S/Ti-MOF, MoS₂/Ti-MOF, ZnS/CdS/Ti-MOF also can be fabricated via this method.