Synthesis Of Zeolite By Activated Attapulgite And Study On Photocatalytic Properties

Facing the current serious water pollution problems in the world,especially the high-chroma,non-degradable organic wastewater generated by the textile industry,it has caused a boom in research from all walks of life.Current research hotspots focus on selecting efficient and non-polluting photocatalysts to accelerate their environmental pollution problems.Zinc-containing compounds such as Zn O,Zn S,etc.all have photocatalytic activity.Zinc-containing photocatalysts have excellent physical and optical properties,strong chemical stability,and are also non-toxic,harmless,and non-secondary pollution.In order to solve the difficult problem of photocatalyst recovery and reuse and to improve the treatment effect of dye wastewater,researchers often choose composite materials.The composite of zinc-containing compounds and porous materials can improve their photocatalytic efficiency.ZSM-5 molecular sieve shows outstanding advantages in many alternative composites due to its unique pore structure and good stability.In this study,modified attapulgite(ATP)was used as the silicon source,and sodium metaaluminate(Na Al O₂),zinc nitrate(Zn(NO₃)₂),microporous template agent tetrapropylammonium bromide(TPABr),and mesopores were added.Template agent P123,a multi-stage porous zinc-containing composite made by hydrothermal crystallization.A series of Zn-containing multi-stage pore composites with different modified attapulgite,different silicon-aluminum ratio,silicon-zinc ratio,micro-mesopore ratio,and different crystallization temperature and crystallization time were prepared,and subjected to X-ray powder diffraction(XRD),Scanning electron microscopy(SEM)was used to characterize its structure and morphology.Through UV-visible diffuse reflection analysis,specific surface area and pore size analysis,the texture characteristics and light-response activity analysis of multi-hole zinc-containing composites were analyzed.The photocatalytic degradation experiment was carried out by simulating the printing and dyeing wastewater by heating and refluxing the methylene blue(MB)solution for 8h.The single-factor test was used to explore its photocatalytic effect in different metal doping amounts,solution p H,initial concentration,catalyst dosage and mercury lamp power.A model was established to explore the effects of solution p H,initial concentration,and mercury lamp power on the photocatalytic degradation of MB solutions.The results show that the crystals are synthesized using alkaline acid modified attapulgite as the silicon source,the silicon-aluminum ratio is 200:1,the silicon-zinc ratio is 100:1,and the micro-mesopore template ratio is 100:1.High,clear morphology,specific surface area of 332.86m~2/g,mesoporous volume accounts for 37.47%of the total pore volume;and shows good ultraviolet light response,in photocatalytic degradation experiments,light exposure for 60min,zinc-containing multi-stage pore compound The photocatalytic degradation rate of the material reached 99.25%,and the photocatalytic degradation rate after repeated reuse was 96.36%.The best reaction conditions were:solution p H=8.78,initial concentration of 11.82mg/L,and mercury lamp power of 500W.In this paper,there are 38 figures,11 tables,and 108 references.