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首页> 外文期刊>RSC Advances >Real roles of perylene diimides for improving photocatalytic activity
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Real roles of perylene diimides for improving photocatalytic activity

机译：Per Bernene二酰亚胺改善光催化活性的真正作用

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Three novel visible-light-driven composite photocatalysts: five-membered O-heterocyclic annulated perylene diimide doped TiO _(2) ( PDI-1 /TiO _(2) ), 1-phenol- N , N ′-dicyclohexyl perylene-3,4,9,10-tetracarboxylic diimide doped TiO _(2) ( PDI-2 /TiO _(2) ), and N , N ′-dicyclohexyl perylene diimide doped TiO _(2) ( PDI-3 /TiO _(2) ), were synthesized using a hydrothermal synthesis method. The effects of introducing PDIs with different structures into TiO _(2) were evaluated by assaying the photodegradation rate of Methylene Blue (MB). The photoactivities of the PDI-1 /TiO _(2) and PDI-2 /TiO _(2) catalysts were better than that of PDI-3 /TiO _(2) . This is because the large surface area of PDI-1 nanorods and PDI-2 nanobelts extended the 1D charge carrier channel, which facilitated electron transfer to the TiO _(2) surface and improved the photocatalytic activity of the composites. The PDI-1 /TiO _(2) composite showed the highest photoactivity, and the activity remained at 86.4% after four reuse cycles. The extended π–π stacking of self-assembled PDI-1 and the strong interactions between self-assembled PDI-1 and TiO _(2) played significant roles in accelerating charge transfer and decreasing recombination of photogenerated electron–hole pairs. The steric hindrance of the phenoxy substituent at the bay position of PDI-2 prevented the PDI-2 nucleus from contacting TiO _(2) and weakened the interaction between PDI-2 and TiO _(2) , which further resulted in the low photoactivity of PDI-2 /TiO _(2) . This work provides a practical way to improve the performances of traditional organic and inorganic composite photocatalysts.
机译：三种新型可见光复合复合光催化剂：五元o-杂环包埋的前二酰亚胺掺杂TiO _（2）（PDI-1 / TiO _（2）），1-苯酚-N，N'-二环己基Perylene-3 ，4,9,10-四羧酸二酰亚胺掺杂TiO _（2）（PDI-2 / TiO _（2））和N，N，N'-二氯己基丙烯二酰亚胺掺杂TiO_（2）（PDI-3 / TiO _（ 2）），使用水热合成方法合成。通过测定亚甲基蓝（MB）的光降解速率来评价将PDI与不同结构引入TiO _（2）的效果。 PDI-1 / TiO _（2）和PDI-2 / TiO _（2）催化剂的光活体优于PDI-3 / TiO _（2）的催化剂。这是因为PDI-1纳米棒的大表面积和PDI-2纳米座伸展了1D电荷载体通道，其促进了电子转移到TiO _（2）表面并改善了复合材料的光催化活性。 PDI-1 / TiO _（2）复合材料显示出最高的光度，并且在四个重用循环后，活性保持在86.4％。自组装的PDI-1的延伸π-π堆叠和自组装的PDI-1和TiO _（2）之间的强相互作用在加速电荷转移和降低光梳理电子孔对的重组中起显着作用。 PDI-2的湾位置处的苯氧基取代基的空间阻碍防止了PDI-2核接触TiO _（2），并削弱了PDI-2和TiO _（2）之间的相互作用，这进一步导致低的光活性PDI-2 / TIO _（2）。这项工作提供了改善传统有机和无机复合光催化剂的性能的实用方法。

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