纳米二氧化钛薄膜光催化处理造纸废水的研究

采用微波辅助低温法制备锐钛矿结构的二氧化钛薄膜。通过X射线衍射(XRD)、扫描电子显微镜(SEM)和接触角测定分析技术对其物相、显微结构和亲水性进行了表征;在波长为254nm的紫外灯照射下,对TiO2薄膜光催化降解造纸废水前后COD值变化作了研究,探讨了不同光催化条件、造纸废水初始COD浓度、pH值及水温变化对COD去除率的影响。结果表明:与传统溶胶凝胶法制备的薄膜相比,微波辅助低温制备的薄膜光催化效果更佳。当废水初始COD值在500～1000mg/L之间、pH为4.0、水温为35℃、紫外灯照射8.0h时,光催化效果最佳,COD去除率为81.3%。

A study onphoto catalytic activity of nanatase TiO2 film in treating paper mill wastewater

The anatase TiO2 films were prepared through microwave assisted method in low temperature. The phase, morphology and hydrophilicity of as-prepared samples were characterized by X-Ray diffraction, scanning electron microscopy analyses and determination of contact angle; the photo catalytic activity in papermaking wastewater under the radiation of ultraviolet lamp with 254nm of wavelength were also investigated by measuring COD of the wastewater before and after treatment; and the effects of photocatalytic reaction conditions, initial concentrations of papermaking wastewater and pH values on the decomposing were systematically studied. The results indicate that photocatalytic degradation of TiO2 film prepared by microwave-assisted low-temperature method is better than film obtained by conventional sol-gel method. COD removal rate of wastewater reach to 81.3% with a concentration of wastewater between 500 mg/L and 1000mg/L, pH of 4.0, water temperature of 35℃and radiation time of 8.0h.