| Dye wastewater is characterized by its complexity,high color,strong alkalinity,and high CODCr.The large area of contaminated water and the complex composition make the treatment of dye wastewater increasingly difficult.Therefore,dye wastewater has become a difficult and urgent problem to be addressed in the international community.Photocatalysis technology can be used to degrade and mineralize organic compounds.This technology has the advantages of fast reaction speed,low process cost,mild operating conditions,and no secondary pollution.From a global perspective,photocatalysis has become the most active research field in the application of organic pollutant treatment methods,and it is also the most promising direction.The preparation of composite photocatalytic materials involves loading stable photocatalysts onto the surface of ceramic particles,which changes the physical and chemical properties of the ceramic surface and endows the ceramic particles with photocatalytic properties.At the same time,this solves the problem of difficult recovery of photocatalytic materials,and the materials float on the liquid surface,which can absorb light energy to the greatest extent and better exert photocatalytic performance.This paper focuses on using porous floating ceramic particles as carrier materials to enhance the photocatalytic process due to their excellent physical and chemical properties.Modified porous floating ceramic particles carry a positive charge in neutral water,with most of the particle surface being negatively charged.Therefore,the electrical properties of modified porous floating ceramic particles are better than those of ordinary porous floating ceramic particles.Due to their good charge transfer performance and chemical stability,modified particles have better acid-alkali corrosion resistance and filtration efficiency than ordinary particles.Modified floating ceramic particles have the advantages of both ceramics and modifiers,making them suitable for use in wastewater treatment.This study aims to explore the removal performance of modified porous floating ceramic particles as adsorbents for the removal of methyl orange and methylene blue in dye wastewater treatment and provide a theoretical basis for practical engineering applications.In this study,copper oxide and titanium dioxide were used to modify the porous floating ceramic particles,and the modified particles were used to treat simulated dye wastewater containing methyl orange and methylene blue.Single-factor degradation experiments were used to study the treatment effect of modified porous floating ceramic particles on simulated dye wastewater.XRD,SEM,and other characterization methods were used to analyze and study the structure,morphology,and elements of the prepared composite materials.The impact factors and reaction conditions for degrading dye wastewater were preliminarily studied,and the thermodynamics,kinetics,and degradation mechanisms of methyl orange degradation were briefly discussed.The main conclusions of the paper are as follows:1.Three types of Cu2O@floating ceramic,white Ti O2@floating ceramic and black Ti O2@floating ceramic were successfully prepared and characterized using XRD,SEM,TEM,EDS,etc.2.This paper uses porous floating ceramic particles as carrier materials and loads cuprous oxide on the surface of the ceramic particles.At the same time,titanium dioxide is used as a photocatalyst,and black and white titanium dioxide are prepared by different preparation processes and loaded on the surface of the ceramic particles.Using methyl orange and methylene blue as simulated wastewater,single-factor experiments are conducted to test the photocatalytic performance of the three composite materials.The optimal treatment conditions under single-factor degradation experiments are:for cuprous oxide,the initial concentration is 30 mg/L,the time is 2 hours,the dosage is 20g/L,and the p H is 8,achieving a degradation rate of 92.05%for methyl orange.For methylene blue,the initial concentration is 30 mg/L,the time is 2 hours,the dosage is 20g/L,and the p H is 6,achieving a degradation rate of 93.4%.For white titanium dioxide,the initial concentration is 20 mg/L,the time is 3 hours,the dosage is 15 g/L,and the p H is 6,achieving a degradation rate of 85.51%for methyl orange.The initial concentration is 10 mg/L,the photocatalytic time is 2.5 hours,the dosage is 15 g/L,and the p H is 8,achieving a degradation rate of 88.43%for methylene blue.For black titanium dioxide,the initial concentration is 20 mg/L,the time is 2 hours,the dosage is 25 g/L,and the p H is 6,achieving a degradation rate of 89.22%for methyl orange.The initial concentration is 5 mg/L,the time is 2.5 hours,the dosage is 25 g/L,and the p H is 8,achieving a degradation rate of 91.2%for methylene blue.3.The degradation of methyl orange was found to follow both the Langmuir-Hinshelwood kinetic model and the Freundlich thermodynamic model.The degradation mechanism of methyl orange was discussed from the perspectives of the synergistic effect of adsorption and photocatalytic oxidation and the strong oxidation of hydroxyl radicals generated by the photocatalyst.4.After treatment of methyl orange wastewater by the supported ceramic particles,the particles still exhibited good porosity,adsorption performance,and hardness.They could be soaked in dilute hydrochloric acid for several hours,dried,and then reloaded with Cu O to reduce the waste of natural resources and save costs,showing promising research and application prospects. |
