Photoelectrocatalytic COD determination method using highly ordered TiO(2) nanotube array.
Photoelectrocatalytic COD determination method using highly ordered TiO(2) nanotube array.
复制标题
DOI：
10.1016/j.watres.2009.01.035
复制
发表时间：
2009-04
期刊：
影响因子：
12.8
通讯作者：
Jialing Zhang;B. Zhou;Q. Zheng;Jinhua Li;Jing Bai;Yanbiao Liu;W. Cai
中科院分区：
文献类型：
--
作者：
Jialing Zhang;B. Zhou;Q. Zheng;Jinhua Li;Jing Bai;Yanbiao Liu;W. Cai
本工作主要研究了基于高效TiO 2纳米管阵列电极的薄池反应器中光电催化法测定COD的实验研究。考察了电解液、阳极电位、阳极时间、溶液pH、焙烧温度和时间等制备参数对TiO 2纳米管阵列电极光电催化性能的影响。在1%HF电解液、阳极电位20 V、阳极时间5 min、焙烧温度450°C条件下制备的TiO 2纳米管阵列电极具有良好的光电催化性能。将其用于薄电池光电催化反应器测定COD时，无需滴定，只需1- 5 min即可完成有机物的氧化，比标准K_2Cr_2O_7法（2- 4 h）快得多。它消耗非常有限的无害和廉价的支持电解质，无二次污染。该方法的动态工作范围为0- 850 mg/L，比文献报道的任何使用纳米TiO 2或纳米薄膜的光电催化方法都宽得多。研究了水组分的影响，提出了TiO 2纳米管阵列法。对真实的水样进行了分析，用该法测定的真实的水样的COD值与标准重铬酸盐法测定的结果一致，具有良好的准确性、稳定性和重现性。
This work focuses on the experimental studies of a photoelectrocatalytic method for COD determination in a thin-cell reactor based on a highly effective TiO2nanotube array electrode. The effect of preparation parameters on the photoelectrocatalytic performance of TiO2nanotube array electrodes including the electrolyte, anodic potential, anodic time, solution pH, calcination temperature and time was examined. The TiO2nanotube array electrode prepared in preparation parameters at 1% HF electrolyte solution, anodic potential 20V, anodic time 5min, calcination temperature 450°C with highly photoelectrocatalytic performance was chosen as the working electrode. When it is used in a thin-cell photoeletrocatalytic reactor for COD determination, it requires about 1–5min to complete the oxidation of organics without further titration, much faster than the standard K2Cr2O7method (2–4h). It consumes very limited harmless and inexpensive supporting electrolyte, free from secondary pollution. A wide dynamic working range of 0–850mg/L can be achieved by this method, much wider than any other photoeletrocatalytic methods using TiO2nanoparticles or nanofilms in the reported literature. The effects of the water components were studied to propose the TiO2nanotube array method. Real sample analyses were also carried out and the COD value of real samples determined by this method agreed well with the standard dichromate method, and it shows good accuracy, stability and reproducibility.