| Fly ash is a kind of waste of large thermal power plant coal-fired boiler emissions and it is a kind of very valuable resource too. How to effectively use the two energy reduce the occupied land and the pollution of the environment and create use value has been paid more and more attention. Using fly ash as the main raw material to synthesize zeolite molecular sieve has become a very important aspect of application of fly ash. Molecular Sieves of Zeolites have large specific surface areas,hydrothermal stability and abundant micropores. The important application of good adsorption and separation effect it has on ion exchange catalysis and photocatalysis is widely favored by the people. Photocatalysis technology mainly based on titanium dioxide is a kind of high processing rate, low energy consumption, no waste water pollution treatment technology of two new, simple process and equipment. Because of the small size of TiO2, it is difficult to be recycled and easy to form the two pollution. The carrier can be very good to be secured with zeolite molecular sieves. This paper focuses on two aspects of the content.The first is how to take the fly ash as the main raw material for the preparation of zeolite molecular sieve.The second is how to make the zeolite molecular sieve prepared with Tio2effective load.In this paper, the method for preparing zeolite molecular sieves is alkali fusion hydrothermal method. Using the pretreated fly ash as the main raw material and NaOH, Na2CO3mixed molten fly ash synthesis zeolite products. This experiment researches effects of different ash ratio, calcination temperature and time, different hydrothermal temperature and time and other experimental factors on the structure and properties of zeolite synthesis. By using X ray diffraction (XRD), scanning electron microscopy (SEM), specific surface area (BET) and characterization of morphology, the phase and specific surface area were characterized and the yield was calculated. The test results show that, when NaOH:fly ash:Na2CO3is1.2:1:0.3, the calcination temperature is550℃, the calcination time is70min, the crystallization temperature is90℃, and the crystallization time is24h, the type of prepared zeolite molecular sieve is mainly Na-X. The specific surface area is90.123m2/g. The yield is56.9%.The zeolite molecular sieve is as the carrier to load titanium dioxide. This paper according to different raw materials used in general adopted three kinds of experimental scheme. Using ethanol and four butyl titanate as the main raw material for preparation of supported TiO2/zeolite molecular sieve and discussing the sequence of molecular sieve with the results of the experiments, the results show that the in situ sol-gel TiO2product obtained the best morphology, the specific surface area is up to145.782m2/g, and the photocatalytic degradation rate of methyl orange can reach as high as50.2%. In four of butyl titanate and isopropyl alcohol as the main raw material preparation of supported TiO2/zeolite molecular sieve and discussing how to load the experimental results, the results show that the40%TiO2/zeolite molecular sieve has the largest specific surface area up to151.452m2/g, and the photocatalytic degradation rate of methyl orange can reach as high as59.8%. Using titanium isopropoxide and isopropyl alcohol as the main raw material for preparation of supported TiO2zeolite molecular sieve and discussing the effect of calcination temperature on the product, the results showed that the optimum calcination temperature is500℃, the specific surface area was up to149.3m2/g,the degradation rate of methyl orange was up to51.2%.Contrasting these three schemes, the product prepared by four of butyl titanate and isopropyl alcohol as the main raw material preparation of supported TiO2/zeolite molecular sieve has the argest specific surface area and the best photocatalytic performance. |
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