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首页> 外文期刊>RSC Advances >Highly efficient photocatalytic degradation of methylene blue by P2ABSA-modified TiO2 nanocomposite due to the photosensitization synergetic effect of TiO2 and P2ABSA
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Highly efficient photocatalytic degradation of methylene blue by P2ABSA-modified TiO2 nanocomposite due to the photosensitization synergetic effect of TiO2 and P2ABSA

机译：TiO 2 与P2ABSA的光敏协同作用，P2ABSA修饰的TiO 2 纳米复合物高效光催化降解亚甲基蓝

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摘要

To enhance the photocatalytic activity of TiO2, poly-2-aminobenzene sulfonic acid (P2ABSA)-modified TiO2 nanocomposites were successfully synthesized using an in situ oxidative polymerization method. The modified nanocomposites were characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, and a photocurrent test. The photocatalytic degradation of methylene blue was chosen as a model reaction to evaluate the photocatalytic activities of TiO2 and P2ABSA/TiO2 nanocomposites, with results indicating that P2ABSA/TiO2 exhibited the higher activity. The apparent first-order rate constant, kapp, of P/T(2/1) was 0.0138 min?1, which was six times higher than that of TiO2 (0.0021 min?1). Meanwhile, the P2ABSA/TiO2 nanocomposites showed excellent photocatalytic stability, which was dependent on structural stability. A photocatalytic activity enhanced mechanism has been proposed, accounting for the photosensitization effect and synergetic effect of TiO2 with P2ABSA. Mass spectroscopy analysis showed that there were two possible degradation pathways for MB, via degradation of the chromophoric group or the auxochrome group.
机译：为了增强TiO 2 的光催化活性，聚-2-氨基苯磺酸（P2ABSA）改性TiO 2 原位氧化聚合方法成功合成了纳米复合材料。通过扫描电子显微镜，X射线衍射，透射电子显微镜，X射线光电子能谱，紫外可见漫反射光谱和光电流测试来表征改性的纳米复合材料。以亚甲基蓝的光催化降解为模型反应，评价TiO 2 和P2ABSA / TiO 2 < / small>纳米复合材料，结果表明P2ABSA / TiO 2 表现出更高的活性。 P / T（2/1）的表观一级速率常数 k app 为0.0138 min ？1 ，是TiO 2 的六倍（0.0021 min ？1 ） ）。同时，P2ABSA / TiO 2 纳米复合材料表现出优异的光催化稳定性，这取决于结构稳定性。考虑到TiO 2 与P2ABSA的光敏作用和协同作用，提出了一种提高光催化活性的机理。质谱分析表明，有两种可能的MB降解途径，发色基团或辅助色素基团的 via 降解。

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