Liu Lan, Li Ruizhen, Liu Yong, Zhang Jingdong
Key laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China.
College of Materials and Chemical Engineering, Sichuan University of Science and Engineering, Zigong, Sichuan 643000, PR China.
J Hazard Mater. 2016 May 5;308:264-75. doi: 10.1016/j.jhazmat.2016.01.046. Epub 2016 Jan 22.
A photoelectrocatalytic system for removal of ofloxacin and Cu(2+) complex was developed. In such a photoelectrocatalytic system, highly ordered titanium dioxide nanotubes served as a highly active photoanode for photoelectrocatalytic degradation of ofloxacin; and titanium plate was used as the cathode, on which Cu(2+) ions were electrodeposited. Compared with other treatment methods including photocatalysis, electrochemistry and direct photolysis, photoelectrocatalytic technique exhibited the highest removal efficiency for either ofloxacin or Cu(2+). To obtain the optimum photoelectrocatalytic operation conditions, some influencing factors such as current, pH and supporting electrolyte concentration were investigated systematically. The mutual influence analysis indicated that the photoelectrocatalytic removal efficiency of ofloxacin was first promoted by Cu(2+) but was then suppressed with prolonging the treatment time; whereas the removal of Cu(2+) was always promoted by ofloxacin over the whole photoelectrocatalytic treatment process. Furthermore, the photoelectrocatalytic removal of ofloxacin -Cu(2+) was studied by differential pulse voltammetry and high-performance liquid chromatography-mass spectrometry. The results indicated that although Cu(2+) influenced the removal rate of ofloxacin, it did not change the degradation mechanism of ofloxacin. The formation of an electroactive intermediate product during the photoelectrocatalytic process was clearly observed by voltammetric analysis. Based on intermediate products identified by high-performance liquid chromatography-mass spectrometry, a possible photoelectrocatalytic removal mechanism for ofloxacin -Cu(2+) was proposed.
开发了一种用于去除氧氟沙星和铜（Ⅱ）络合物的光电催化系统。在这种光电催化系统中，高度有序的二氧化钛纳米管用作氧氟沙星光电催化降解的高活性光阳极；钛板用作阴极，铜（Ⅱ）离子在其上电沉积。与包括光催化、电化学和直接光解在内的其他处理方法相比，光电催化技术对氧氟沙星或铜（Ⅱ）的去除效率最高。为了获得最佳的光电催化操作条件，系统地研究了电流、pH值和支持电解质浓度等一些影响因素。相互影响分析表明，铜（Ⅱ）最初促进了氧氟沙星的光电催化去除效率，但随着处理时间的延长而受到抑制；而在整个光电催化处理过程中，氧氟沙星始终促进铜（Ⅱ）的去除。此外，通过差分脉冲伏安法和高效液相色谱-质谱联用研究了氧氟沙星-铜（Ⅱ）的光电催化去除。结果表明，虽然铜（Ⅱ）影响了氧氟沙星的去除率，但它并没有改变氧氟沙星的降解机制。通过伏安分析清楚地观察到光电催化过程中形成了一种电活性中间产物。基于高效液相色谱-质谱联用鉴定的中间产物，提出了一种可能的氧氟沙星-铜（Ⅱ）光电催化去除机制。
