催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (4): 637-642.DOI: 10.3724/SP.J.1088.2011.01246

• 研究论文 • 上一篇    下一篇

二氧化钛纳米管阵列光电催化同时降解苯酚和 Cr(VI)

王后锦1,2, 吴晓婧1,2, 王亚玲1,2, 焦自斌1, 颜声威1, 黄浪欢1,2   

  1. 1暨南大学化学系, 广东广州 510632; 2暨南大学纳米化学研究所, 广东广州 510632
  • 收稿日期:2010-12-22 修回日期:2011-01-21 出版日期:2011-04-18 发布日期:2014-08-30

Simultaneous Removal of Phenol and Cr(VI) by TiO2 Nanotube Array Photoelectrocatalysis

WANG Houjin1,2, WU Xiaojing1,2, WANG Yaling1,2, JIAO Zibin1, YAN Shengwei1, HUANG Langhuan1,2,*   

  1. 1Department of Chemistry, Jinan University, Guangzhou 510632, Guangdong, China; 2Institute of Nano-chemistry, Jinan University, Guangzhou 510632, Guangdong, China
  • Received:2010-12-22 Revised:2011-01-21 Online:2011-04-18 Published:2014-08-30

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1191

被引次数

54

摘要： 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 100 nm, 管长约为 2 um, 在 0.5 V 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.

关键词: 二氧化钛, 光电催化, 共去除, 苯酚, 铬

Abstract: TiO2 nanotube arrays were prepared by electrochemical anodization on pure Ti surfaces. The products were characterized by X-ray diffraction, scanning electron microscopy and electrochemical workstation. The results showed that the prepared sample was anatase with a diameter of about 100 nm and a tube length of about 2 um. The maximum photocurrent could be achieved when the bias potential of 0.5 V was applied on the TiO2 nanotube array electrode. The photoelectrocatalytic properties of the TiO2 nanotube array electrode were evaluated by the simultaneous removal of phenol and Cr(VI). The effects of catalytic processes, pH values, and various initial concentrations of Cr(VI) and phenol on the removal efficiency of phenol and Cr(VI) were investigated. The results indicated that in the photoelectrocatalytic mode, phenol and Cr(VI) removal ratios were 86.7% and 96.9%, respectively, while in the photocatalytic mode they were 48.2% and 65.2%, respectively. The removal efficiency by photoelectrocatalysis was higher than that by photocatalysis. The acidic solutions were favorable for the photoelectrocatalytic simultaneous removal of Cr (VI) and phenol, and the optimum pH was 2. In the phenol-Cr(VI) co-existed system, phenol and Cr(VI) were more efficiently eliminated than in the single phenol or Cr(VI) system. The reduction of Cr(VI) and the oxidation of phenol produced a synergistic effect, which promoted the simultaneous removal of Cr(VI) and phenol.

Key words: titania, photoelectrocatalysis, simultaneous removal, phenol, chromium