采用电化学阳极氧化法在纯钛箔基底上制备了TiO2纳米管阵列,并运用X射线衍射、扫描电镜和电化学工作站对其进行了表征.结果表明,所制样品是锐钛矿相,管径约为100nm,管长约为2μm,在0.5V偏压下光电流最大.以苯酚和Cr(VI)混合溶液为目标污染物,考察了TiO2纳米管阵列光电催化同时去除苯酚和Cr(VI)的反应性能,探讨了催化方式、溶液pH和污染物初始浓度对其催化性能的影响.结果表明,采用光电催化方式,苯酚和Cr(VI)的去除率分别达86.7%和96.9%,而光催化方式下则分别仅为48.2%和65.2%.酸性条件下有利于TiO2纳米管阵列光电催化同时去除苯酚和Cr(VI),且在pH=2时,效果最佳.Cr(VI)-苯酚共存体系中,Cr(VI)及苯酚的去除率均较单一组分体系的高;Cr(VI)的还原与苯酚的氧化之间产生了协同效应,共同促进了苯酚与Cr(VI)的去除.
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