Department of Chemistry and Bioscience, Kumoh National Institute of Technology, Gumi 39177, Korea.
Molecules. 2022 Jun 11;27(12):3770. doi: 10.3390/molecules27123770.
Efficient utilization of visible light for photocatalytic hydrogen production is one of the most important issues to address. This report describes a facile approach to immobilize visible-light sensitizers on TiO surfaces. To effectively utilize the sensitization of Sn(IV) porphyrin species for photocatalytic hydrogen production, perfluorosulfonate polymer (Nafion) matrix coated-TiO was fabricated. Nafion coated-TiO readily adsorbed -diaqua[-tetrakis(4-pyridinium)porphyrinato]tin(IV) cation [(TPyP)Sn(OH)] via an ion-exchange process. The uptake of [(TPyP)Sn(OH)] in an aqueous solution completed within 30 min, as determined by UV-vis spectroscopy. The existence of Sn(IV) porphyrin species embedded in the Nafion matrix coated on TiO was confirmed by zeta potential measurements, UV-vis absorption spectroscopy, TEM combined with energy dispersive X-ray spectroscopy, and thermogravimetric analysis. Sn(IV)-porphyrin cationic species embedded in the Nafion matrix were successfully used as visible-light sensitizer for photochemical hydrogen generation. This photocatalytic system performed 45% better than the uncoated TiO system. In addition, the performance at pH 7 was superior to that at pH 3 or 9. This work revealed that Nafion matrix coated-TiO can efficiently produce hydrogen with a consistent performance by utilizing a freshly supplied cationic Sn(IV)-porphyrin sensitizer in a neutral solution.
有效利用可见光进行光催化制氢是亟待解决的重要问题之一。本报告描述了一种将可见光敏化剂固定在 TiO 表面的简便方法。为了有效地利用 Sn(IV)卟啉物种的敏化作用进行光催化制氢，制备了全氟磺酸聚合物（Nafion）涂覆的 TiO。Nafion 涂覆的 TiO 通过离子交换过程容易吸附 -二水合[-四（4-吡啶基）卟啉基]锡（IV）阳离子[（TPyP）Sn（OH）]。通过紫外-可见光谱确定，[（TPyP）Sn（OH）]在水溶液中的吸附在 30 分钟内完成。通过 ζ 电位测量、紫外-可见吸收光谱、TEM 结合能色散 X 射线光谱和热重分析证实了存在嵌入 Nafion 涂覆在 TiO 上的 Nafion 矩阵中的 Sn(IV)卟啉物种。嵌入 Nafion 基质中的 Sn(IV)-卟啉阳离子物种被成功用作光化学制氢的可见光敏化剂。该光催化体系的性能比未涂覆的 TiO 体系好 45%。此外，在 pH 7 时的性能优于在 pH 3 或 9 时的性能。这项工作表明，Nafion 涂覆的 TiO 可以在中性溶液中利用新鲜供应的阳离子 Sn(IV)-卟啉敏化剂高效地产生氢气，且性能一致。
