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Real roles of perylene diimides for improving photocatalytic activity
RSC Advances ( IF 3.9 ) Pub Date : 2020-6-17 , DOI: 10.1039/d0ra03421e Fengxia Zhang 1 , Wenjing Li 1 , Tianyi Jiang 1 , Xuemei Li 1 , Yuanyuan Shao 1 , Yongshan Ma 1 , Junsen Wu 1
RSC Advances ( IF 3.9 ) Pub Date : 2020-6-17 , DOI: 10.1039/d0ra03421e Fengxia Zhang 1 , Wenjing Li 1 , Tianyi Jiang 1 , Xuemei Li 1 , Yuanyuan Shao 1 , Yongshan Ma 1 , Junsen Wu 1
Affiliation
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Three novel visible-light-driven composite photocatalysts: five-membered O-heterocyclic annulated perylene diimide doped TiO2 (PDI-1/TiO2), 1-phenol-N,N′-dicyclohexyl perylene-3,4,9,10-tetracarboxylic diimide doped TiO2 (PDI-2/TiO2), and N,N′-dicyclohexyl perylene diimide doped TiO2 (PDI-3/TiO2), were synthesized using a hydrothermal synthesis method. The effects of introducing PDIs with different structures into TiO2 were evaluated by assaying the photodegradation rate of Methylene Blue (MB). The photoactivities of the PDI-1/TiO2 and PDI-2/TiO2 catalysts were better than that of PDI-3/TiO2. 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 TiO2 surface and improved the photocatalytic activity of the composites. The PDI-1/TiO2 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 TiO2 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 TiO2 and weakened the interaction between PDI-2 and TiO2, which further resulted in the low photoactivity of PDI-2/TiO2. This work provides a practical way to improve the performances of traditional organic and inorganic composite photocatalysts.
中文翻译：
苝二酰亚胺在提高光催化活性方面的实际作用
三种新型可见光驱动复合光催化剂：五元 O-杂环环化苝二亚胺掺杂 TiO 2 ( PDI-1 /TiO 2 )、1-苯酚-N , N '-dicyclohexyl perylene-3,4,9,10使用水热合成法合成了-四羧酸二亚胺掺杂的TiO 2 ( PDI-2 /TiO 2 )和N , N'-二环己基苝二亚胺掺杂的TiO 2 ( PDI-3 /TiO 2 )。将不同结构的PDI引入TiO 2的效果通过测定亚甲蓝 (MB) 的光降解率来评估。PDI-1 /TiO 2和PDI-2 /TiO 2催化剂的光活性优于PDI-3 /TiO 2。这是因为PDI-1纳米棒和PDI-2纳米带的大表面积扩展了一维电荷载流子通道，有利于电子转移到TiO 2表面，提高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活性，经过四次重复使用后，活性仍保持在 86.4%。自组装PDI-1的扩展 π-π 堆叠以及自组装PDI-1和 TiO 2之间的强相互作用在加速电荷转移和减少光生电子-空穴对的复合方面发挥了重要作用。PDI-2湾位苯氧基取代基的位阻阻碍了PDI-2核与TiO 2的接触，削弱了PDI-2与TiO 2的相互作用，进一步导致PDI-2 /TiO 2 的光活性较低。 2. 这项工作为提高传统有机和无机复合光催化剂的性能提供了一条切实可行的途径。
更新日期：2020-06-17
中文翻译：
苝二酰亚胺在提高光催化活性方面的实际作用
三种新型可见光驱动复合光催化剂：五元 O-杂环环化苝二亚胺掺杂 TiO 2 ( PDI-1 /TiO 2 )、1-苯酚-N , N '-dicyclohexyl perylene-3,4,9,10使用水热合成法合成了-四羧酸二亚胺掺杂的TiO 2 ( PDI-2 /TiO 2 )和N , N'-二环己基苝二亚胺掺杂的TiO 2 ( PDI-3 /TiO 2 )。将不同结构的PDI引入TiO 2的效果通过测定亚甲蓝 (MB) 的光降解率来评估。PDI-1 /TiO 2和PDI-2 /TiO 2催化剂的光活性优于PDI-3 /TiO 2。这是因为PDI-1纳米棒和PDI-2纳米带的大表面积扩展了一维电荷载流子通道，有利于电子转移到TiO 2表面，提高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活性，经过四次重复使用后，活性仍保持在 86.4%。自组装PDI-1的扩展 π-π 堆叠以及自组装PDI-1和 TiO 2之间的强相互作用在加速电荷转移和减少光生电子-空穴对的复合方面发挥了重要作用。PDI-2湾位苯氧基取代基的位阻阻碍了PDI-2核与TiO 2的接触，削弱了PDI-2与TiO 2的相互作用，进一步导致PDI-2 /TiO 2 的光活性较低。 2. 这项工作为提高传统有机和无机复合光催化剂的性能提供了一条切实可行的途径。
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