Preparation Of Metal Phase MoS₂ And TiO₂ Nanotube Composites And Their Photocatalytic Performance

In recent years,with the increasingly serious environmental pollution,more and more attention has been paid to clean and efficient pollution control programs.Photocatalytic technology,which uses the energy of solar radiation to decompose pollutants in water,is a clean and effective way of pollution control,so it has received more and more attention.The performance of photocatalytic materials seriously limits the application and promotion of photocatalytic technology,so the synthesis of high-efficiency photocatalyst has become a research hotspot in recent years.Titanium dioxide has been used in the field of photocatalysis for a long time because of its excellent photoelectric properties.Titanium dioxide nanotubes（TNTs）are a kind of titanium dioxide material with a special morphology structure.Compared with zero-dimensional titanium dioxide nanoparticles,this structure has a larger specific surface area,higher utilization of sunlight,stronger adsorption,and greater potential in the field of photocatalysis power.However,due to the wide bandgap,poor response to visible light,high recombination efficiency of photogenerated electrons and holes,the ability of photocatalysis is limited.The metal phase molybdenum disulfide（1T-MoS₂）has narrow bandgap,well visible light absorption and high carrier transport capacity,so it can be used to improve the photocatalytic capacity of TNTs.In this paper,1T-MoS₂@TNTS composite was prepared and its structure and properties were characterized as follows:1.In situ growth of 1T-MoS₂@TNTs photocatalyst and its photocatalytic propertiesFirst,the in-situ synthesis method was used to prepare the composite of 1T-MoS₂@TNTs by the hydrothermal method.The composite materials with different ratios were prepared and compared.The results show that MoS₂ is a pure 1T phase,and MoS₂nanoparticles are uniformly distributed on TiO₂ nanotubes.The prepared composite catalyst has a narrower band gap,enhanced light response and lower electrochemical impedance.The experimental results show that the efficiency of degradation of tetracycline hydrochloride by 1T-MoS₂@TNTs composite photocatalyst under visible light is 57%.The addition of 1T-MoS₂ is beneficial to the electron transfer in the catalyst.2.Study on TNTs coated 1T-MoS₂ photocatalyst and its photocatalytic performance1T-MoS₂ is coated inside the TiO₂ nanotubes by the hydrothermal method.Because1T-MoS₂ is not in contact with the external environment,it can give full play to its strong electronic transmission ability.The experimental results show that 1T-MoS₂ in the composite is still pure,and there is no phase transition in the process of titanium dioxide forming nanotubes.The response of the composite to visible light is the same as that of pure TiO₂,but the photocatalytic degradation of tetracycline hydrochloride is greatly improved.