Preparation Of 13X/TiO₂ Composite Photocatalytic Adsorbent And Its Adsorption Properties To Methylene Blue

With the rapid development of human economy and urban industrialization,the problem of ecological pollution is more and more serious.Among all kinds of pollutions,the most serious one is the water pollution,which is the most damaging to human beings.There are many reasons for water pollution,which is difficult to control because of the complex pollutants,large amount of wastewater and high COD content.Dye wastewater is a kind of refractory industrial wastewater.Every year,a large number of untreated dye wastewater is discharged into rivers,causing irreversible harm to the environment.In this paper,the composition of cationic dye wastewater was simulated by disposing methine blue solution.The optimum synthesis conditions of 13X/TiO2 composite photocatalytic adsorbent and its optimal conditions for photocatalytic degradation of methylene blue solution were studied.The large-scale treatment of dye wastewater provides the theoretical basis.Nano titanium dioxide has excellent photocatalytic properties,but difficult to load and recovery.13X zeolite has uniform structure,with the ability of selective adsorption of small molecules,Therefore,in this paper,we use 13X zeolite molecular sieve as the basic carrier,C16H36O4Ti as the titanium source,by sol-gel method to achieve the titania on the 13X zeolite molecular sieve load.In the experiment,a single variable method was adopted to determine the optimum reaction conditions by controlling the calcination temperature,the different titanium contents and the pH value of the solution.Meanwhile,X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),thermogravimetric analysis(TGA),scanning electron microscopy(SEM)and static adsorption experiments were used to synthesize the 13X/TiO2 composite light with the best performance Catalytic adsorbents were characterized by a series of.The experimental results show that the optimal synthesis conditions are as follows:the calcination temperature is 300?,the dosage of tetrabutyl titanate is 10ml,the pH of the solution is 1.Under these conditions,the synthesized samples have good degree of order and degree of curing,and the photocatalytic adsorption capacity of methylene blue is the best,the adsorption capacity can reach 297.96mg/g.After the optimum synthesis conditions of 13X/TiO2 composite photocatalytic adsorbent were determined,the effects of light irradiation,the mass of 13X/TiO2 composite photocatalyst,the initial pH of the solution and the adsorption time and temperature were investigated.Blue solution.The principle of adsorption kinetics of the best synthetic samples was also investigated by pseudo first-order velocity model.The experimental results show that the removal rate of Methylene blue solution is the highest at the initial pH of Methylene blue solution of 10 at room temperature under the ultraviolet light(ultraviolet high pressure mercury lamp wavelength of 365nm),which can reach 99.32%.In the regeneration experiments,the adsorption equilibrium time becomes longer,the removal rate is also decreasing.When the reaction is repeated until the fourth time,the removal rate of 13X/TiO2 posite photocatalytic adsorbent for methylene blue is reduced to 78.23%The sample has a good reusability.