Preparation Of Bismuth Molybdate Photoelectrocatalytic Electrode And It's Degradation Of Organic Matter

How to remove organic pollution in wastewater is one of the problems in the environmental field.Photoelectrocatalytic oxidation is a new type of water treatment technology that combines the characteristics of light and electricity,energy saving,high efficiency and no secondary pollution.In the degradation of pollutants in water,if electrocatalytic oxidation alone occurs,the electrodeization phenomenon caused by electrogenerated polymer often occurs.However,due to the introduction of photocatalysis in photoelectrocatalytic oxidation,the surface of the electrode is activated to maintain good electrocatalysis.active.Photoelectrocatalytic oxidation technology is an improvement of photocatalytic technology.By using a granular catalyst to form a thin film electrode,the utilization rate of the catalyst is improved,and the electrochemical technology is combined to improve the photoelectron recombination rate of the photocatalysis.Increased oxidation efficiency.The core of photoelectrocatalytic oxidation is the development of new photoelectrodes and efficient use of light.The ternary oxide Bi₂MoO₆ is known from its basic electronic configuration.The outermost electrons of Bi are arranged in 6s²6p³.The easy loss of three electrons is often stable with Bi³⁺,so it has stable chemical properties,narrow band gap and unique Physical properties,showing superior performance in photocatalytic processes.Therefore,this study intends to prepare a Bi₂MoO₆ thin film photocatalytic electrode with good response in the visible wide wave range,and construct an electro-assisted photocatalytic system to treat organic wastewater.In this thesis,Bi₂MoO₆ is the main research object.The surfactants cetyltrimethylammonium bromide?CTAB?and lanthanide rare earth Tm doping modification are used to investigate the visible light utilization rate,photogenerated electron and hole recombination and photoelectricity.Synergistic enhancement mechanism.While expanding the application of Bi₂MoO₆ photocatalyst,the prepared photocatalyst is supported on FTO-based conductive glass to obtain photoanode,and it is applied to photocatalytic degradation of dye wastewater methylene blue?MB?.The research results provide theoretical basis for the development of efficient treatment of organic wastewater.With technical guidance.The following research conclusions were obtained through research:?1?Self-assembly of Bi₂MoO₆ was induced by surfactant CTAB,and Bi₂MoO₆photoelectrode was prepared by coating method.Self-assembled Bi₂MoO₆photoelectrode changed from original granular to smaller flaky structure;self-assembled Bi₂MoO₆ photoelectrode The gap width was reduced from 2.57eV to 2.23eV;the photocurrent was about 0.029?A/cm²,which was 1.5 times stronger than the surfactant not added.By degrading MB wastewater,it was found that the photodegradation efficiency of the surfactant was increased by 26%.?2?The rare earth element Tm³⁺doping of pure Bi₂MoO₆ by hydrothermal method can effectively change the morphology of Bi₂MoO₆.After doping with rare earth element Tm³⁺,the ultra-flaky Bi₂MoO₆ is obtained and the thickness is 3⁹nm.It is treated with modified Bi₂MoO₆.MB wastewater showed strong catalytic activity,and its activity enhancement mechanism was explored by UV-visible diffuse reflection,fluorescence spectroscopy,fluorescence lifetime and electrochemical characterization.?3?Ultra-thin nanostructured photocatalytic anodes were prepared by calcination at different temperatures by coating method with Bi₂MoO₆ photocatalyst doped with rare earth element Tm³⁺,and applied to the degradation of dye wastewater.Bi₂MoO₆photoanode has excellent photoelectrocatalytic performance.The MB degradation rate can reach 72%within 120min.The phase structure,micromorphology,photoelectron lifetime,photo-generated carrier separation efficiency and electrochemical performance of the photocatalytic anode show that the Bi₂MoO₆ photoanode has strong catalytic activity due to its good pore structure and Ultra-thin nano-layered structure,which gives it a fast material transfer rate characteristic.