Synthesis And Characterization Of TiO₂&TiO₂/ZSM-5 Composite Photocatalyst

Facing the an increasingly serious environmental problems,photocatalysis provides an effective mean has been applicated in the field of pollution control and environmental purification at present. TiO₂ has many advantages such as high catalytic activity, stable performance, no pollution, cheep and available. It is widely applicated in the organic pollutants degradation field. The composite of ZSM-5 and TiO₂ can make up for the shortage of the TiO₂, and will be helpful to improve its photocatalytic performanc.In this paper, the preparation and its physicochemical properties of TiO₂ and TiO₂/ZSM-5 catalyst composite have been studied. The as synthesized samples were characterizated by SEM, TEM, XRD, FT-IR and TG-DTA. The photocatalytic degradation of rhodamine B solution experiment is as the probe reaction for evaluating photocatalytic performance of the above catalysts, and the obtained results are as follows:TiO₂ photocatalyst can be prepared in two systems of CTAB and OP-10. The crystal type are both the tetragonal crystal, high crystalline. TiO₂ photocatalyst can be prepared in the CTAB system, the sample appearance is a cylindrerl and uniform-sized, the partricle size is about 50 nm. It is mixture of anatase and rutile phase. The proper preparation conditions for TiO₂ in this system are as follows: H2 O volume is 18 mL, CTAB dosage is1.739 g, crystallization temperature is 600 °C and the crystallization time is 5 h. When the dosage of TiO₂ photocatalyst is 0.04 g, the decolorization rate of rhodamine B can be up to99.4%. TiO₂ photocatalyst can be prepared in OP-10 system, the sample appearance is a spheric particle and uniform-sized, the partricle size is about 20 nm. It is anatase. The proper preparation conditions of TiO₂ in the system are as follows: H2 O volume is 18 mL,OP-10 dosage is 2.05 g, crystallization temperature is 500 °C and crystallization time is 5h. When the dosage of TiO₂ photocatalyst is 0.04 g, the decolorization rate of rhodamine B can be up to 99.6%.TiO₂/ZSM-5 composite photocatalyst were prepared in the sol-gel method. TiO₂ particles dispersed on the surface of ZSM-5 molecular sieves, which can restrain the increasing of crystalline size. The proper preparation conditions of TiO₂/ZSM-5 in the method are as follows: isopropyl alcohol is as the solvent, TiO₂ ration in the compositecatalysts is 0.4, crystallization temperature is 650 °C and crystallization time is 5 h. In the catalytic reaction, the TiO₂/ZSM-5 dosage of composite photocatalyst is 0.04 g, intial concentration of dye is 4 mg/L, selecting active rhodamine B solution, the maximum decolorization rate of rhodamine B aqueous solution can be up to 99.7%.