Au-TiO2纳米管阵列的制备及其在降解制糖废水中的应用

采用阳极氧化法在纯钛表面制备出了TiO2纳米管阵列薄膜.以罗丹明B为目标降解物,20W紫外灯（λ =253.7 nm）作为光源,探讨了制备Au-TiO2纳米管阵列（Au-TNTs）的最佳工艺,并采用扫描电镜（SEM）、X射线衍射物相分析（XRD）、能谱分析（EDS）等对样品进行了表征.结果表明,以1g/L HAuC14＋ 30 g/L H3BO3为沉积液,当沉积电压为2.5V、超声条件下电沉积时间为60 s时,可制得理想稳定的Au-TNTs；Au掺入量占薄膜质量的16.71％,Au的掺入并没有改变TiO2纳米管阵列的表面形貌及晶型,但却显著提高了TiO2纳米管阵列的光催化活性.将Au-TNTs用于制糖废水的光催化降解,结果发现：当光照时间为30 h、pH值为1时,Au-TNTs对制糖废水的光催化降解率可达89.59％,比TNTs高出80％.Au-TNTs对制糖废水的光催化降解过程符合一级动力学过程.

Preparation of Au-TiO2 Nanotube Arrays and Application of Photochemical Degradation in Sugar Wastewater

The thin film of TiO2 nanotube arrays is prepared preparing the Au-doped TiO2 nanotube arrays （Au-TNTs） is by the method of anodic oxidation, The process of monitored, using Rhodamine B as an object poilu- tant under irradiation of a 20 W ultraviolet lamp （A =253.7 nm）. The samples of Au-TNTs are characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, energy dispersive spectrometry （EDS）. The results show that best Au-doped TiO2 nanotube array catalyst could be prepared when 1 g · L-1 HAuC14 ＋ 30 g · L-1 H3BO3 is used as deposition liquid, and ultrasonic electrodeposition is 60 s and the voltage is 2. 5 V. If the incorporation of Au accounted for 16. 71% of the overall film quality and the Au-doping did not change the morphology and structure of the TiO2 nanotube arrays, it could increase significantly the photocata- lyric activity of the TiO2 nanotube. When Au-TNTs is used as the photodegradation in processing the sugar wastewater, the photocatalytic degradation efficiency of sugar wastewater reaches the highest value of 85.59%, 80% higher than TNTs when pH is 1. The photodegradation process of the sugar wastewater on Au-TNTs is in line with the dynamical process.