CoNi/TiO₂-C纳米管电极的制备及太阳光电催化性能

Preparation of CoNi/TiO₂-C Nanotube Electrode and Its Photoelectrocatalytic Performance

摘要: 以Ti板为基材，NH₄F的乙二醇溶液为阳极氧化电解液，采用二次阳极氧化法成功制备了TiO₂纳米管/Ti，以葡萄糖为碳源、采用高压水热反应掺杂碳，并采用电化学沉积的方法成功合成了CoNi/TiO₂-C纳米管电极。采用透射电子显微镜(TEM)和X射线衍射(XRD)进行表征，并以10 mg/L的甲基橙溶液为目标降解物，测定了其在不同的pH、电压条件下太阳光电催化降解性能。结果表明，马弗炉500℃焙烧得到的TiO₂纳米管为锐钛矿相，C、CoNi合金的沉积并未影响TiO₂材料的晶相结构。甲基橙溶液的pH值为2、电压为8 V时，该电极降解效果最佳，太阳光照射100 min后甲基橙的降解率达到95%以上。

Abstract: The TiO₂/Ti nanotubes (NTs) was successfully prepared by the secondary anodization method, using Ti plate as the substrate, NH₄F glycol solution as the anodizing electrolyte. The CoNi/TiO₂-C NTs electrode was successfully synthesized using glucose as the carbon source to dope carbon by high-pressure hydrothermal reaction and electrochemical deposition method. The prepared electrode was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Methyl orange solution of 10 mg/L was used as the target degradation product to evaluate its solar photocatalytic degradation performance under different conditions of pH and voltage. The results showed that anatase phase TiO₂ nanotubes can be obtained after calcination in a muffle furnace at 500˚C for 3 h, the doping of C and CoNi alloy does not affect the crystal phase structure of the TiO₂ material. The photoelectrocatalytic degradation results indicated that the electrode had the best degradation effect under the condition of pH 2 and voltage 8 V, the degradation rate of methyl orange can reach more than 95% after 100 minute’s sunshine.