光催化
苯甲醇
苯甲醛
催化作用
乙腈
酒精氧化
吸附
光化学
选择性
材料科学
可见光谱
无机化学
化学
有机化学
光电子学
作者
Samira M. Abdel-Azim,Delvin Aman,Eric van Steen,Howaida Abd El Salam
出处
期刊:Research Square - Research Square
日期:2021-10-14
标识
DOI:10.21203/rs.3.rs-963756/v1
摘要
Abstract The current study focuses on the photocatalytic oxidation of benzyl alcohol in acetonitrile under air bubbling conditions comparing titania-based materials, Cu-MOF, and Cu-MOF-NH 2 as semiconductor photocatalysts. The catalysts were characterized by XRD, N 2 adsorption-desorption, FT-IR, Raman spectroscopy, and TEM. The photocatalytic benzyl alcohol conversion reached ~ 100% after exposing the four prepared catalysts to a 125W mercury lamp for up to 240 min. Benzaldehyde is formed with a moderate selectivity (after a reaction time of 60 min. ca. 30% over the titania-based catalysts 37%, 45% over Cu-MOF, and Cu-MOF-NH 2 , respectively). The formation of electron-hole pairs at the surface of the semiconductor nanoparticles followed by oxidation reaction was the suggested mechanism. A first-order kinetic model was observed for the photocatalytic oxidation of the investigated alcohols, and the rate constants were calculated. According to preliminary research, decorating MOF linker by amine (MOF-NH 2 ) could improve visible-light harvesting, charge separation, and electron transport of the resulting catalyst, resulting in increased photocatalytic activity. The current work offers some direction for the development of MOF-based photocatalysts for organic synthesis.
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