Preparation Of Novel Bismuth Halide Composite For Adsorption And Photocatalysis On Degradation Of Dye Wastewater

Dye wastewater discharged into the receiving water may cause serious damage to aquatic organisms and human health.Conventional biological treatment method was difficult to degrade most dye molecules effectively.In recent years,semiconductor photocatalytic materials,which possessed advantages of high efficiency and non-toxicity,have been widely used for treating dye wastewater.However,most traditional photocatalysts have poor activation effect in visible light.Therefore,developing a new type of visible light catalytic materials with excellent performance has been a research hotspot.In this paper,a new bismuth halide complex with adsorption and visible light catalytic functions for organic dyes was developed.The main contents and results are as follows:In this paper,BiOI,BiOBr,MoS₂,BiOI/MoS₂,BiOI/BiOBr/MoS₂ was prepare by solvothermal method,and X-ray Diffraction?XRD?,Specific Surface and Pore Size Analysis?BET?,Scanning Electron Microscope?SEM?,Transmission Electron Microscope?TEM?,X-ray Energy Spectrum Analysis?EDS?were utilized to characterize the above catalytic materials,proving that heterojunction was formed in the structure of composite products.Then,the degradation of rhodamine B?RhB?,methyl orange?MO?and malachite green?MG?as the targeted contaminants were used to investigate the adsorption and photocatalytic performance of the product.BiOI was found to have excellent adsorbability and catalytic performance and the ability to response to visible light was superior than BiOBr which had a wider band gap.The adsorption and catalytic properties of BiOI/BiOBr/x%MoS₂ powder on rhodamine B,methyl orange,malachite green water solutions with a concentration of 10 mg/L were investigated by changing the reaction time,pH and the type of light source.The experiment showed that the composite material has better performance than the single catalytic material,owing to the formation of heterojunction of the composite material.When a variety of materials are combined,the electron transition path of which will be changed that can promote the separation of carriers.BiOI/BiOBr/0.5%MoS₂ composite had a better degradation rate of 89.46%on the simulated wastewater of methyl orange within 3 hours.Finally,BiOI/BiOBr/MoS₂ was loaded on glass fiber cloth and carbon fiber cloth respectively.The experimental results showed that the BiOI/BiOBr/MoS₂ fiber composite prepared in this paper had a good catalytic performance.All of the catalytic degradation rate of the three kind of simulated dyes wastewater were higher than 85%in visible light.The fiber provides more active sites for catalysis,and the fixation effect of the binder reduces the agglomeration phenomenon of the nanoparticles in the water.The conductive property of the carbon fiber cloth had greatly promoted the separation of photogenerated electrons,showing a better catalytic auxiliary effect than the glass fiber.Fiber supported catalytic materials has excellent stability,which can reduce the loss of catalyst,solve the recycling problem and be reused repeatedly without deactivation.It is expected to be applied in practical engineering.