Preparation Of TiO₂ Based Nanomaterials And Their Photoelectrocatalytic Degradation Of Methyl Orange Wastewater

With the development and application of various science and technology and the rapid changes in the living standard of mankind,the pollution problem with environment has become increasingly serious,which has sounded the clock for environmental protection again.During the 12th Five-year and 13th Five-year Plan period,the government has never ceased investment and management for environmental issues.In the treatment of industrial waste water,especially the treatment of printing and dyeing wastewater is the most important task of environmental protection.At the same time,a variety of traditional or new wastewater treatment technologies are being applied to the treatment of printing and dyeing wastewater.a new and clean advanced oxidation technology started to develope for the treatment of non biodegrade pollutants in printing and dyeing wastewater.In particular,TiO₂ nano photocatalyst materials have many advantages,from an economic point of view:cheap,available to get raw materials,storage convenience,from its own nature point of view:stable physical,chemical properties,non-toxic and harmless and so on.However,in the actual application of printing and dyeing wastewater,TiO₂ nanoparticles are difficult to recycle and have low efficiency for visible light.Therefore,to further play its value in the actual printing and dyeing wastewater,more and more ways are used to make up for the defects of TiO₂.In this paper,we have prepared one-dimensional TiO₂ nanomaterials on the substrate by several different methods,which possess efficient photoelectrocatalytic performance and recyclability.The main contents are as follows:1.The study for photoelectrocatalytic performance of one-dimensional TiO₂ nanotube materials grown solidly on high-purity Ti substrate.NH₄F as solute and glycol/water?volume ratio of 9:1?as mixed solvent.In the electrolyte,one-dimensional TiO₂ nanotube electrode material was prepared by anodic oxidation.Using SEM,XRD and other characterization methods,and instantaneous photocurrent testing,linear voltammetry scan test and other modern analytical testing techniques for its characterization and photoelectrocatalytic performance testing.The results showed that the microstructure of the TiO₂ nanotubes material is one-dimensional,vertical,hollow,neatly arranged tube.Subsequent heat treatment temperature,the size of bias voltage,and the presence or absence of light affect its photoelectrocatalytic performance.2.The study for photoelectrocatalytic performance of one-dimensional TiO₂ nano-column material grown solidly on FTO substrate.The dilute hydrochloric acid solution of butyl titanate was used as the precursor solution,and the one-dimensional TiO₂ nano-column material was prepared by hydrothermal method.Using SEM,XRD and other characterization methods,and instantaneous photocurrent test,linear voltammetry and other modern analytical testing techniques for characterization and photoelectrocatalytic performance testing.The results showed that the microstructure of the prepared TiO₂ nano-column material is vertical columnar and regular arrangement.Subsequent heat treatment temperature,the size of external bias,and the presence or absence of light all affect its photoelectrocatalytic performance.3.The study for Photoelectrocatalytic degradation of the methyl orange wastewater by One-dimensional TiO₂ nanomaterials.Photoelectrocatalytic performance of the prepared TiO₂ nanotubes materials and TiO₂ nano-column materials as photoanode catalysts were study in different degradation modes and cycle degradation times and various external conditions.The methyl orange simulates the degradation effect of printing and dyeing wastewater as the target pollutant.The results showed that at 365nm UV light and 1V applied bias voltage,the degradation efficiency of 10 mg/L methyl orange was 72.5%and 92.3%in 2h,respectively,for the TiO₂ nanotubes material and TiO₂ nano-column material after heat treatment at 450°C.And after 11 cycles,they are able to maintain a stable photoelectrocatalytic and good recycling ability.4.The study for photoelectrocatalytic performance of CuSbS₂/TiO₂ nano-column material.CuSbS₂/TiO₂ nano-column material was prepared by hydro-thermal method with TiO₂ nano-column solidly grown on FTO as substrate.Using SEM,XRD and other characterization methods and impedance testing,UV-Visible diffuse reflectance testing and other modern analytical techniques to characterize its detection and photoelectrocatalytic performance.The results showed that the CuSbS₂ successfully grown on TiO₂nano-column in the form of a thin film.The CuSbS₂/TiO₂ nano-column material had a significant response to visible light,which was about 1.3 times the photocurrent signal response of the pure TiO₂ nano-column material in the visible region.