Heterogeneous photocatayltic deperoxidation with UV and visible light
Heterogeneous photocatayltic deperoxidation with UV and visible light
复制标题
紫外线和可见光的多相光催化脱过氧化
DOI：
10.1002/poc.3807
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发表时间：
2018
影响因子：
1.8
通讯作者：
A. Greer
中科院分区：
文献类型：
--
作者：
N. Walalawela;A. Greer
J Phys Chem. 2018;e3807. https://doi.org/10.1002/poc.3807摘要描述了一项物理有机研究，研究了与敏化剂4，4 ′-二甲基苯偶酰或二氢卟酚e6共吸附在气相（无孔）二氧化硅上的过氧化二异丙苯的光分解。采用质子核磁共振和气相色谱-质谱联用技术，研究了过氧化二异丙苯的非均相光敏化分解过程，并通过产物苯乙酮、2-苯基丙醇和α-甲基苯乙烯的脱附来监测。过氧化二异丙苯和敏化剂以1：4至200：1的比例共吸附在二氧化硅上，其中以约10：1的比例发生高过氧化物去稳定化。这种增加的光分解对应于6至9 μ m的敏化剂-过氧化物距离。提出了一种Dexter三重态能量转移机制，解释了二氧化硅上过氧化物O―O键均裂效率较高的敏化剂和过氧化物分离距离较短的原因。因此，这种两相（气/固）系统可以起到使过氧化物不稳定和稳定的作用，其可以实际用于递送用于细菌消毒的烷氧基自由基。
J Phys Org Chem. 2018;e3807. https://doi.org/10.1002/poc.3807 Abstract A physical‐organic study is described on the photodecomposition of dicumyl peroxide co‐adsorbed with the sensitizers 4,4′‐dimethylbenzil or chlorin e6 on fumed (nonporous) silica. Dicumyl peroxide was decomposed by the heterogeneous photosensitization and monitored by the desorption of products acetophenone, 2‐phenylpropan‐2‐ol, and α‐methylstyrene using proton nuclear magnetic resonance and gas chromatography‐mass spectrometry. Dicumyl peroxide and sensitizer were co‐adsorbed on silica in 1:4 up to 200:1 ratios, with high peroxide destabilization occurring in ratios of about 10:1. This increased photodecomposition corresponded to sensitizer‐peroxide distances of 6 to 9 Å. A Dexter triplet energy transfer mechanism is proposed that explains the short sensitizer and peroxide separation distances for higher peroxide O―O bond homolysis efficiencies on silica. This biphasic (gas/solid) system can thus serve both to destabilize and stabilize a peroxide, which may be of practical use for the delivery of alkoxy radicals for bacterial disinfection.
影响因子：
15
作者：
Zamadar, Matibur;Ghosh, Goutam;Mahendran, Adaickapillai;Minnis, Mihaela;Kruft, Bonnie I.;Ghogare, Ashwini;Aebisher, David;Greer, Alexander
通讯作者：
Greer, Alexander
影响因子：
15
作者：
Aebisher D;Bartusik D;Liu Y;Zhao Y;Barahman M;Xu Q;Lyons AM;Greer A
通讯作者：
Greer A