摘要
采用电化学阳极氧化法在纯Ti片表面制备出结构整齐有序的TiO2纳米管阵列，研究了溶液体系和pH值对TiO2纳米管尺寸和形貌的影响。利用X射线衍射仪和场发射扫描电子显微镜表征了不同条件下制备的TiO2纳米管，20V反应15h，质量分数为0．5％HF＋1mol／L（NH4）H2PO4溶液中TiO2纳米管直径为70～90nm，长度约2．2μm。以纳米管薄膜为光阳极，施加0．45V的外加偏压，在125W紫外光照射4h后，初始质量浓度为10mg／L的亚甲基兰COD降解率达到93％。
High density, well ordered, vertically aligned and uniform titanium oxide nanotube arrays were fabricated on the surface of pure titanium sheet by direct electrochemical anodic oxidation with 0.5 % HF and 0.5% HF ＋ 1 mol/L （ NH4 ） H2PO4 as the supporting electrolyte at 20 V. XRD and SEM techniques were used to characterize titanium oxide nanotube arrays. The XRD result shows that TiO2 showed the anatase phase after having been annealed for 1 hour under 400 ℃. SEM shows the length of nanotubes did not increase after reaction for 20 mins in an electrolyte solution of 0.5% HF. But in an electrolyte solution of 0. 5% HF ＋ 1 mol/L （NH4） H2PO4, at 20 V after reaction for 15 h, the average diameter of nanotubes is about 70 - 90 nm, and the length of nanotubes is about 2. 2μm. Photo-electrochemical character curves were tested in an electrolyte solution of 1 mol/L KOH under the irradiation of a high-voltage mercury lamp, photocurrent is about 3.5 mA/cm^2 for nanotubes with a length of 2.2 μm. With TiO2 nanotubes of 2.2 μm in length as anode, under illuminating of a high-voltage mercury lamp at 0. 45 V bias potential, after 4 h, the COD degradation degree of Methylene Blue electrolyte（ 10 mg/L） is about 93%.
出处
《应用化学》
CAS
CSCD
北大核心
2008年第6期665-668,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(50471105)资助项目
关键词
阳极氧化
TIO2纳米管
亚甲基兰
光催化降解
anodic oxidation,TiO2 nano-tubes, mathylene bule,photocatalytic decomposition
