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Particularities of photocatalysis and formation of reactive oxygen species on insulators and semiconductors: cases of SiO2, TiO2 and their composite SiO2–TiO2†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-09-28 00:00:00 , DOI: 10.1039/c8cy00991k Crina Anastasescu 1, 2, 3 , Catalin Negrila 3, 4, 5 , Daniel G. Angelescu 1, 2, 3 , Irina Atkinson 1, 2, 3 , Mihai Anastasescu 1, 2, 3 , Nicolae Spataru 1, 2, 3 , Maria Zaharescu 1, 2, 3 , Ioan Balint 1, 2, 3
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-09-28 00:00:00 , DOI: 10.1039/c8cy00991k Crina Anastasescu 1, 2, 3 , Catalin Negrila 3, 4, 5 , Daniel G. Angelescu 1, 2, 3 , Irina Atkinson 1, 2, 3 , Mihai Anastasescu 1, 2, 3 , Nicolae Spataru 1, 2, 3 , Maria Zaharescu 1, 2, 3 , Ioan Balint 1, 2, 3
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Highly defected tubular SiO2 is found to outperform the activity of TiO2-P25 and the SiO2–TiO2 composite in photocatalytic H2 generation from methanol–water solution under simulated solar light AM 1.5. The enhanced performances of SiO2 come from the particularities of the reaction mechanism and ROS (reactive oxygen species) generation. The SiO2 exposed to light generates solely 1O2 (singlet oxygen). The TiO2-P25 produces uniquely large quantities of ˙OH radicals whereas the formation of O2− is evidenced only over SiO2–TiO2, along with small amounts of ˙OH. The TiO2 works as a photocatalyst by intermediation of ˙OH radicals. In contrast, the organic substrate is activated on the surface of SiO2 by the intra-band gap, isolated, surface quantum defects. Distinct reaction mechanisms, involving the participation of photogenerated charges and ROS, are proposed. The material-related ROS production can be of great practical importance in fields such as biology (germ inactivation), medicine (photodynamic therapy by 1O2), and synthesis of oxygenated organic compounds of great added value.
中文翻译：
绝缘体和半导体上光催化的特殊性和活性氧的形成：SiO 2，TiO 2及其复合SiO 2 -TiO 2 †的情况
发现在模拟太阳光AM 1.5下，高缺陷管状SiO 2在甲醇水溶液中光催化H 2生成中的性能优于TiO 2 -P25和SiO 2 -TiO 2复合材料的活性。SiO 2性能的提高来自于反应机理和ROS（活性氧）生成的特殊性。暴露在光下的SiO 2仅产生1 O 2（单氧）。在TiO 2 -P25产生唯一大量的OH基，而的O形成的2 -仅在证明的SiO 2-TiO 2以及少量的˙OH。TiO 2通过˙OH自由基作为光催化剂起作用。相反，有机基底通过带内间隙，孤立的表面量子缺陷而在SiO 2的表面上活化。提出了不同的反应机理，涉及光生电荷和ROS的参与。与材料相关的ROS的产生在生物学（细菌灭活），药物（通过1 O 2进行光动力疗法）以及合成具有高附加值的氧化有机化合物等领域中可能具有重要的实践意义。
更新日期：2018-09-28
中文翻译：
绝缘体和半导体上光催化的特殊性和活性氧的形成：SiO 2，TiO 2及其复合SiO 2 -TiO 2 †的情况
发现在模拟太阳光AM 1.5下，高缺陷管状SiO 2在甲醇水溶液中光催化H 2生成中的性能优于TiO 2 -P25和SiO 2 -TiO 2复合材料的活性。SiO 2性能的提高来自于反应机理和ROS（活性氧）生成的特殊性。暴露在光下的SiO 2仅产生1 O 2（单氧）。在TiO 2 -P25产生唯一大量的OH基，而的O形成的2 -仅在证明的SiO 2-TiO 2以及少量的˙OH。TiO 2通过˙OH自由基作为光催化剂起作用。相反，有机基底通过带内间隙，孤立的表面量子缺陷而在SiO 2的表面上活化。提出了不同的反应机理，涉及光生电荷和ROS的参与。与材料相关的ROS的产生在生物学（细菌灭活），药物（通过1 O 2进行光动力疗法）以及合成具有高附加值的氧化有机化合物等领域中可能具有重要的实践意义。
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