Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Road, Taipei 106, Taiwan, ROC.
Water Res. 2011 Aug;45(14):4131-40. doi: 10.1016/j.watres.2011.05.020. Epub 2011 May 31.
Titanate nanotubes (TNTs) were used to remove perfluorooctanoic acid (PFOA) from aqueous solutions in this study. Direct photolysis of PFOA by a 254-nm UV light (400 W) was found effective to decompose PFOA without presence of photocatalysts. Shorter-chain perfluorocarboxylic acids (PFCAs) and fluoride ions were formed during photodecomposition. Addition of TNTs as photocatalysts did not greatly enhance photocatalytic decomposition of PFOA. TNTs mainly act as adsorbents to adsorb PFOA and form TNT-PFOA complexes. It suggested that sodium ions and oxygen atoms on the surfaces of TNTs play important roles in PFOA adsorption. X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR) analyses indicated that ion-exchange, electrostatic interaction, and hydrophobic interaction all participated in the photocatalytic reaction of PFOA by TNTs.
在这项研究中，使用钛酸盐纳米管（TNTs）从水溶液中去除全氟辛酸（PFOA）。研究发现，在没有光催化剂存在的情况下，254nm 的紫外光（400W）直接光解 PFOA 可有效分解 PFOA。光解过程中会形成短链全氟羧酸（PFCAs）和氟离子。添加 TNTs 作为光催化剂并没有显著增强 PFOA 的光催化分解。TNTs 主要作为吸附剂来吸附 PFOA 并形成 TNT-PFOA 配合物。这表明 TNTs 表面的钠离子和氧原子在 PFOA 吸附中起重要作用。X 射线光电子能谱（XPS）和傅里叶变换红外光谱（FTIR）分析表明，离子交换、静电相互作用和疏水相互作用都参与了 TNTs 对 PFOA 的光催化反应。
