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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
收稿日期:2020-12-25  
DOI:10.11980/j.issn.0254-508X.2021.03.015
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
基金项目:
作者单位邮编
左欢欢 重庆城市科技学院重庆402167 402167
陈海林 中机中联工程有限公司重庆400039 400039
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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,CODCr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 CODCr 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.
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