Department of Analytical Chemistry, Institute of Chemistry-Araraquara, São Paulo State University - UNESP, SP, Brazil.
Chemosphere. 2010 Jan;78(5):569-75. doi: 10.1016/j.chemosphere.2009.10.058. Epub 2009 Dec 24.
Photoelectrocatalytic oxidation of 0.1mM of Bisphenol A (BPA) leads to 100% of degradation monitored by liquid chromatography with diode array optical detection (limit 1microgL(-1)) and 100% TOC removal. Optimum performance was obtained using TiO(2) nanotubular array (NTA) electrodes, grown by anodization of Ti foil in 0.25wt.% NH(4)F and a mixture of glycerol and water (ratio 90:10vol.%) using an applied voltage of 20V for 50h. The effects of supporting electrolyte, pH, applied bias potential and BPA concentration were evaluated as to their effect on the BPA degradation kinetics and the best condition was found to be 0.1M Na(2)SO(4) at pH 6 as supporting electrolyte and applied bias potential of +1.5V vs. Ag/AgCl under UV irradiation. Our findings indicate that TiO(2) NTAs prepared by anodization are versatile and efficient photocatalysts for the degradation of endocrine disruptors.
采用光电催化氧化法，在 0.1mM 双酚 A（BPA）溶液中，100%的 BPA 经液相色谱-二极管阵列检测（检测限为 1μg/L）完全降解，TOC 去除率达到 100%。采用钛箔阳极氧化法在 0.25wt.% NH4F 和甘油-水（体积比 90:10）混合电解液中施加 20V 电压 50h 制备 TiO2 纳米管阵列（NTA）电极，可获得最佳性能。实验考察了支持电解质、pH 值、外加偏压和 BPA 浓度对 BPA 降解动力学的影响，结果表明以 0.1M Na2SO4 为支持电解质、外加偏压+1.5V（相对于 Ag/AgCl）、pH=6 时，在紫外光照射下，BPA 降解效果最佳。研究结果表明，采用阳极氧化法制备的 TiO2 NTA 是一种高效、多功能的光催化剂，可用于降解内分泌干扰物。
