College of Environmental Science and Engineering and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin, PR China 300071.
Environ Sci Technol. 2010 Jan 1;44(1):419-25. doi: 10.1021/es9019854.
This paper describes the fabrication of two different 3D mesoporous TiO2 microspheres via one-step solvothermal process without templates using different titanium sources. The resulting materials were characterized by XRD, FESEM, TEM, and nitrogen adsorption techniques. Their photodegradation of bisphenol A [2,2-bis(4-hydroxyphenyl)propane, BPA] in aqueous suspension was investigated under UV irradiation. The experimental results revealed that the photocatalytic effect of the two 3D mesoporous TiO2 microspheres was superior to the commercial P25 TiO2, and as-prepared samples as catalysts demonstrated that the smaller pore size it is, the higher the effective degradation for BPA is. Particular attention was paid to the identification of intermediates and analysis of photocatalytic degradation mechanism of BPA by HPLC-MS and HPLC-MS-MS. Five main intermediates were formed during photocatalytic degradation, and their evolution was discussed. On the basis of the evidence of oxidative intermediate formation, a detailed degradation pathway of BPA degradation by two mesoporous TiO2 microspheres photocatalysts are proposed.
本文通过无模板的一步溶剂热法，使用不同的钛源制备了两种不同的 3D 介孔 TiO2 微球。采用 XRD、FESEM、TEM 和氮气吸附技术对所得材料进行了表征。在紫外光照射下，研究了它们在水悬浮液中对双酚 A（2,2-双（4-羟基苯基）丙烷，BPA）的光降解性能。实验结果表明，两种 3D 介孔 TiO2 微球的光催化效果优于商业 P25 TiO2，所制备的样品作为催化剂表明，孔径越小，BPA 的有效降解率越高。特别关注通过 HPLC-MS 和 HPLC-MS-MS 鉴定中间产物和分析 BPA 的光催化降解机理。在光催化降解过程中形成了 5 种主要的中间产物，并对其演化进行了讨论。基于氧化中间产物形成的证据，提出了两种介孔 TiO2 微球光催化剂降解 BPA 的详细降解途径。
