以0.5%（质量分数）NH4F/HF/乙二醇为电解液,采用恒压二次阳极氧化法制备出高度有序的可剥离TiO2纳米管阵列,并对其晶型、形貌以及光催化性能等方面进行了研究。通过XRD测试,可知样品经500和800℃退火,分别得到锐钛矿和金红石型TiO2纳米管;通过SEM表征,可知所制备的TiO2纳米管管径约为100nm,管长约为25μm。在紫外光照射下,以TiO2纳米管阵列为催化剂,对其光催化降解酸性橙7（AO7）和Cr（Ⅵ）混合水溶液进行了研究。考察了不同晶型、pH值、不同酸性橙7和Cr（Ⅵ）初始浓度对光催化性能的影响。结果表明锐钛矿型样品光催化性能高于金红石型,三元体系TiO2/AO7/Cr（Ⅵ）中,协同效应显著,酸性条件下尤其有利于TiO2纳米管阵列光催化共去除AO7和Cr（Ⅵ）。
Well-ordered strippable TiO2 nanotube array was prepared by two-step anodization in 0.5wt% NH4F/HF/glycerol.The performances of the TiO2 nanotube array was studied,such as crystal form,morphology,photocatalytic effect,et al.The X-ray diffraction（XRD） result shows that the samples annealing at 500 and 800℃ are anatase and rutile,respectively.The scanning electron microscopy（SEM） result reveals that the length of the TiO2 nanotubes with pore diameter about 100nm is approximately 25μm.Under UV light,the aqueous solutions containing azodye acid orange 7 and hexavalent chromium were degradated by using TiO2 nanotube arrays as catalyst.The photocatalytic effect of using different crystal forms,different pH values and unlike initial concentrations of acid orange 7（AO7） and hexavalent chromium were investigated.The result shows that the photocatalytic of anatase is better than the rutile.The synergistic effect in the ternary system of TiO2/AO7/Cr（Ⅵ） was outstanding,and the acidic condition were favorable for the removal of AO7 and Cr（Ⅵ）.
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