基于 TPPS 的微污染物敏化光氧化—单线态氧动力学研究。
TPPS-Sensitized Photooxidation of Micropollutants-Singlet Molecular Oxygen Kinetic Study.
机构信息
Molecular Engineering Department, Lodz University of Technology, Wolczanska 213, 90-924 Lodz, Poland.
出版信息
Molecules. 2022 Aug 17;27(16):5260. doi: 10.3390/molecules27165260.
Visible light-sensitized oxidation of micropollutants (MPs) in the presence of meso-tetrakis(4-sulfonatophenyl)porphyrin photosensitizers was studied. In order to explore the role of type I (ROS generation) or type II (singlet oxygen) photooxidation, radical scavengers were used to obtain insight into the mechanism of photodegradation. It was revealed that singlet oxygen is the main ROS taking part in TPPS- sensitized photooxidation of micropollutants. The interaction of MPs with O in deuterium oxide (DO) was investigated by measuring the phosphorescence lifetime of O. The rate constant (kq) for the total (physical and chemical) quenching of O by MPs was determined in a DO buffer (pD 7, 9 and 10.8). The rate constants of singlet oxygen quenching and reaction with MPs were determined, and the rate constant of excited TPPS quenching by MPs was also estimated.
研究了在 meso-四(4-磺酸钠苯基)卟啉敏化剂存在下可见光照敏化微污染物 (MPs) 的氧化作用。为了探究 I 型 (ROS 生成) 或 II 型 (单线态氧) 光氧化的作用，使用自由基清除剂深入研究光降解的机制。结果表明，单线态氧是参与 TPPS 敏化微污染物光氧化的主要 ROS。通过测量 O 的磷光寿命，研究了 MPs 与重水中 O 的相互作用。在 DO 缓冲液 (pD 7、9 和 10.8) 中测定了 MPs 对 O 的总 (物理和化学) 猝灭的速率常数 (kq)。确定了单线态氧猝灭和与 MPs 反应的速率常数，并估计了 MPs 对激发态 TPPS 的猝灭速率常数。
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