阳极氧化制备TiO_2纳米管及总磷的光电催化消解（英文）

Photoelectrocatalytic digestion of total phosphorous utilizing TiO_2 nanotubes fabricated by anodic oxidation

总磷是检测水体富营养化的重要指标,因此研究其消解具有重要的意义。总磷的消解方法有很多,例如传统的高温消解、微波消解、紫外消解、电催化消解、光催化消解等,但是既高效又简易洁净的消解方法仍在不断的研究中。研究了一种基于光电催化的总磷的消解方法,通过在二氧化钛工作电极和对电极之间外加适当的电压来减少电子-空穴对的复合。介绍了用于总磷的光电催化消解中的光催化剂的二氧化钛纳米管的阳极氧化法制备、特性表征及其用于总磷的光电催化消解。阳极氧化法制备的二氧化钛纳米管具有较好的催化活性。将其用于总磷的光电催化消解实验,当2V电压协助光催化消解2h后,消解率达到65.4%,较光催化高了20.7%,较电催化高了61.3%。实验结果表明,与光催化消解、电催化消解方法相比,通过在工作电极和对电极之间添加适当的外加电压的光电催化消解方法可以有效地提高总磷的消解率。

Total phosphorous （TP） is one of the important indicators of water pollution and eutrophica-tion, and the detection of total phosphorus is of important significance. Many digestion methods have been usedfor the detection of TP. TiO2/UV photocatalytic method, as an effective way to degrade organic substances,has been applied to TP digestion due to the advantages of low power consumption, reagent-free. However, dueto the recombination of electron-hole pairs in the digestion process, a higher efficiency of conversion is desired.This paper introduces a photoelectrocatalytic digestion method for TP detection by applying an appropriate po-tential between the TiO2 working electrode and counter electrode to prevent the recombination of electron-holepairs. The characterization of TiO2 nanotubes （NTs）, which were prepared by anodic oxidation and used as thephotocatalyst for TP digestion based on photoelectrocatalysis, was carried out by FESEM and XRD. The diges-tion rate of TP was evaluated by the concentration of phosphate which was measured by analyzer. The corre-sponding digestion rate for 1 mg/L （phosphorus meter） sodium polyphosphate solution is 4. 1%, 44.7% and65.4% in the electrocatalytic process, photocatalytic process and photoelectrocatalytic process, respectively.The results show that the photoelectrocatalytic digestion process is more efficient than the other two processes,and it has the potential to be applied to the pretreatment of TP detection.