In situ decomposition of bromine-substituted catechol to increase the activity of titanium dioxide catalyst for visible-light-induced aerobic conversion of toluene to benzaldehyde
In situ decomposition of bromine-substituted catechol to increase the activity of titanium dioxide catalyst for visible-light-induced aerobic conversion of toluene to benzaldehyde
复制标题
原位分解溴取代儿茶酚提高二氧化钛催化剂可见光诱导甲苯有氧转化为苯甲醛的活性
DOI：
10.1039/d2nj00571a
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发表时间：
2022
影响因子：
3.3
通讯作者：
Hitomi Yutaka
中科院分区：
文献类型：
--
作者：
Aitsuki Kana;Fukushima Daiki;Nakahara Hiroki;Yo Kazumune;Kodera Masahito;Okunaka Sayuri;Tokudome Hiromasa;Koitaya Takanori;Hitomi Yutaka
光催化氧化是环境友好的精细化学品合成的一种有吸引力的方法。此外，半导体作为选择性有机合成的光催化剂已得到深入探索。在这项研究中，我们发现四溴儿茶酚在二氧化钛上的光解产生了表面改性的二氧化钛，在可见光照射下，其在甲苯有氧转化为苯甲醛方面表现出比裸二氧化钛更高的活性。当四溴儿茶酚添加到分散在甲苯中的二氧化钛中时，由于四溴儿茶酚和二氧化钛在表面上形成络合物，二氧化钛粉末变成橙色。通过可见光照射分解四溴儿茶酚，得到无色二氧化钛粉末。我们发现，使用回收的无色二氧化钛粉末在 450 nm 处测定的苯甲醛形成的表观量子产率比裸二氧化钛高约八倍。
Photocatalytic oxidation is an attractive approach for environmentally benign fine chemical synthesis. In addition, semiconductors have been intensively explored as photocatalysts for selective organic synthesis. In this study, we found that the photolysis of tetrabromocatechol on titanium dioxide produced surface-modified titanium dioxide, which showed higher activity than bare titanium dioxide in the aerobic conversion of toluene to benzaldehyde under visible light irradiation. When tetrabromocatechol was added to titanium dioxide dispersed in toluene, the titanium dioxide powder became orange in color due to the complex formation between tetrabromocatechol and titanium dioxide on the surface. The tetrabromocatechol was decomposed by visible light irradiation, and colorless titanium dioxide powder was obtained. We found that the apparent quantum yield of benzaldehyde formation determined by using the recycled colorless titanium dioxide powder at 450 nm was about eight times higher than that of bare titanium dioxide.