Preparation Of Fe₂O₃/TiO₂（B） Nanowires And Its Catalytic Performance In Dyeing Wastewater Degaration

The application of titania photocatalysts as a promising environment protective material is attracting considerable attention in many fileds, especially in wastewater treatment and air purification because of its low selectivity, high catalytic activity, without secondary pollution, nontoxicity and low cost. TiO2(B), as a new semiconductors material, is promising in future application due to its special monclinic structure. However, the photocatalytic activity of TiO2(B) is not so good as antase TiO2 generally. As a result, its application as a photocatalyst is limited. Besides, separation and recovery of TiO2 photocatalysts are significant obstacles for practical application. Therefore, development of novel efficient catalysts with good photocatalytic and separation performance seem to be very important.In this paper, we prepared TiO2(B) nanowires by hydrothermal method using P25 powder, then decorated the catalyst with Fe2O3 to prepare Fe2O3/TiO2(B) nanowires for the first time. The samples were characterized by TEM, HRTEM, XRD, Raman, XPS and N2 adsorption-desorption isotherms. And more details in the effects of hydrothermal time, temperature and annealed temperature on their properities were investigated. Results showed that TiO2(B) nanowires prepared at 200℃/48h shows good photocatalytic activity, and the Fe2O3/TiO2 nanowires with 5% iron (Fe/TiO2(B) nanowires, weight ratio) using which as support held the highest photocatalytic efficiency.Then the photocatalytic activity of Fe2O3/TiO2(B) nanowires were evaluated by photodegradation of reactive 4BS under UV light (the wavelength is above 310 nm) in the presence of H2O2 and the influence of different pH and H2O2 concentration on the degradation performance was discussed. Results showed that the Fe2O3/TiO2(B) nanowires sample had higher photocatalytic activity than bare TiO2(B) nanowires, and the presence of H2O2 could promote the degradation efficiency. The decolorization rate of 4BS was as high as 85% after 120 min photocatalytic reaction time. Acid pH condition was favor for adsorption of containmants on the sample surface and enhancing hydrogen peroxide decomposed to hydroxyl radicals; As a result, the reaction rate was greatly improved. However, the acid condition was harm to the stability of Fe2O3. The inticial concentration of H2O2 exist an optimal value.