Study On The Preparation, Characterization And Catalysis Properties For The Supported Bentonite Catalyst

There is the largest bentonite ore in the world in Xinjiang,but its development and utilization is in scarcity.It will be significant how to develop high value-added bentonite products relying on the local resources of bentonite.TiO2/bentonite complex is an excellent photocatalyst. And the loading amount of TiO2 and specific surface area of catalysts play a great influence on its catalytic degradation effect of the catalyst. In the dissertation,the optimum preparation technology of activited clay was studied andTiO2/pillared bentonite (Ti-PILC) and TiO2/bentonite composite photocatalyst modified by PEG was prepared and studied with two different measures The characterization was studied by XRD, IR, SEM, EDS.The photocatalytic properties of catalyst was discussed with the methyl orange degradation target. Meanwhile the photocatalytic degradation mechanism was studied as well as the application of catalyst. It was shown in the dissertation as follows: (1)The optimum preparation technology parameters of activated clay were as follows: sulfuricacid concentration was16%, liquid-solid ratio was 2:1,reaction temperature was 90℃during the continue reaction 5h. After cooling, the activated clay was diluted to PH=6-7,the drying temperature was100℃(2)The optimum preparation technology of TiO2/pillared bentonite composite photocatalyst was: titanium-pillared bentonite: anhydrous ethanol to 1:40(g/mL), n-butyl titanate, the amount of 17mL, and the load-n-butyl titanate 8, calcined about 4h at the temperature of 350℃.(3)The optimum preparation technology of TiO2/bentonite composite photocatalyst modified by PEG was: the wetting ration between activated clay and water was 1:3(g/mL), the molecular of PEG was 400, the mass ration between the addition amount of PEG and activated clay was 1:5, the roasting temperature was350℃.(4)TiO2/pillared bentonite composite photocatalyst Ti element content (38.14%-40.64%) was more than 100 times activated clay (0.25%-0.43%). The TiO2/bentonite composite photocatalyst modified by PEG element Ti content (4.32%-5.15%) was more 10 times than that of only activated elements, but methyl orange degradation products as a target, the maximum degradation rate was more 20% than of TiO2/pillared bentonite composite photocatalyst; and Petrochemical Plant in Urumqi ammonia wastewater salinity degradation products as the goal, the maximum degradation rate of TiO2/pillared bentonite composite photocatalyst was higher 30% than that of PEG modification of TiO2/bentonite composite photocatalyst. It indicates that the degradation rate of pollutants in the surface of the catalyst had a strong relationship with the adsorption and photocatalytic degradation . In addition, the preparation of PEG modified TiO2/bentonite composite photocatalyst is easier than TiO2/pillared bentonite composite photocatalyst, which would save raw materials and have a low cost.