The Construction And Photocatalytic Properties Of Oxides/titanate Nanotube Composites

Ethyl mercaptan?EM?is a typical malodorous organic sulfur gas,which is harmful to human and ecological environment.In addition,it is toxic to catalysts.Therefore,it must be removed from using fuel or chemicals.This article chooses titanate n-butyl acetate and sodium hydroxide as raw material to prepared the titanate nanotubes by one step hydrothermal process.The prepared titanate nanotubes were used as the host titanium-based catalyst materials,and appropriate guest materials were selected to construct the binary titanate nanocomposites to improve the spectral responsiveness of the composites,realize the effective separation of photogenerated electrons and holes,so that the effective application of sunlight can be realized.In this study,Na₂Ti₃O₇ nanomaterials were prepared by the solvent thermal method,and H₂Ti₃O₇ nanotube?H₂Ti₃O₇-NT?was obtained by the proton exchange.ZnO and NiO metal oxides were selected as guest materials to construct ZnO/H₂Ti₃O₇-NT and NiO/H₂Ti₃O₇-NT binary composite photocatalytic materials.The phase structure and spectral response of the as-prepared samples were characterized by X-ray powder diffraction?XRD?and ultraviolet visible diffuse reflectance spectrum?UV-vis DRS?.The morphology and micro-structure of the samples were analyzed by high resolution transmission electron microscope?HRTEM?and transmission electron microscope?TEM?.The Laser confocal Raman spectroscopy?LRS?and Fourier transform infrared?FT-IR?spectroscopy were used to analyze the skeleton structure of the sample.EM was used as the target gas to evaluate the photocatalytic desulfurization effect by analyzing the residues on the surface of catalyst samples.The results show that the NiO/H₂Ti₃O₇-NT and ZnO/H₂Ti₃O₇-NT composites retain the tubular structure of the H₂Ti₃O₇-NT,and the oxide nanoparticles are distributed on the surface or inside of the nanotubes.The spectral response range of NiO/H₂Ti₃O₇-NT is moved significantly towards to the visible light range compared with the host and object precursor,so that the light response range is effectively extended and the utilization of visible light in sunlight is improved.The NiO/H₂Ti₃O₇-NT has photocatalytic oxidation degradation effect on EM due to the synergistic effect between host and guest.The ZnO/H₂Ti₃O₇-NT composite effectively extends the absorption range of light and improves the application of sunlight compared with the precursor H₂Ti₃O₇-NT.However,its response to visible light is obviously weakened compared with NiO/H₂Ti₃O₇-NT.The ZnO/H₂Ti₃O₇-NT has a certain photocatalytic degradation effect for EM under simulated sunlight.The binary nanocomposite materials still retain the original tubular structure after composite modification.The introduction of the guest material does not change the original structure of the host materials.The oxide particles are mainly dispersed on surface of the host material,and there is obvious interaction between the host and guest materials.The composite materials show good adsorption and photocatalytic degradation effects for EM.This work provides a simple and feasible idea for the theoretical exploration and practical application of the design and construction of binary composite photocatalytic materials.Figure 20 table 8 reference 79...