N掺杂TiO2纳米管阵列膜光催化剂制备及其处理造纸废水的研究

Preparation of N-doped TiO2 Nanotube Array Membrane Catalyst and Its Application in Photocatalytic Treatment of Papermaking Wastewater

关键词:  阳极氧化  TiO₂纳米管  可见光催化剂  造纸废水

Key Words:anodization  TiO₂ nanotube  visible-light photocatalyst  papermaking wastewater

摘要:本研究通过阳极氧化技术制备了N掺杂TiO₂纳米管阵列膜光催化剂，用于光催化处理造纸废水中的有机物。采用场发射扫描电子显微镜（FESEM）、X射线衍射仪（XRD）和紫外可见分光光度计（UV-Vis）对光催化剂表面形貌和化学组成等特征进行了表征。结果表明，当阳极氧化电压为40 V时，TiO₂纳米管阵列膜具有高度有序的形貌，其孔径和纳米管长度达到一个最佳状态；该TiO₂光催化剂的晶型为锐钛矿型，且从UV-Vis的结果来看，其吸收带边发生了明显的红移，对光有很强的吸收能力。将制备的光催化剂用于光催化造纸废水，当光催化剂用量为2.5 g/L，光照时间为60 min时，COD_Cr去除率达到80.1%，色度去除率达到90.2%。

Abstract:In this study， a N-doped TiO₂ nanotube array membrane catalyst was prepared by anodizing technology for photocatalytic treatment of organic matter in papermaking wastewater. Field emission scanning electron microscope （FESEM）， X-ray diffractometer （XRD） and ultraviolet-visible spectrophotometer （UV-Vis） were used to characterize the surface morphology and chemical composition of the sample. The results showed that the TiO₂ nanotube array membrane had a highly ordered morphology， and its pore size and nanotube length reached an optimal state when the anodizing voltage was 40 V. In addition， the crystal form of the TiO₂ catalyst was anatase， and as shown in the results of UV-Vis， it had a strong light absorption capacity with the absorption band edge had a significant red shift. When the prepared catalyst was used in photocatalytic papermaking wastewater， the removal rate of COD_Cr and chroma of the waste water reached 80.1% and 90.2%， respectively with the dosage of catalyst was 2.5 g/L and reaction time of 60 min.