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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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摘要

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), andN,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 TiO(2)were evaluated by assaying the photodegradation rate of Methylene Blue (MB). The photoactivities of thePDI-1/TiO(2)andPDI-2/TiO(2)catalysts were better than that ofPDI-3/TiO2. This is because the large surface area ofPDI-1nanorods andPDI-2nanobelts extended the 1D charge carrier channel, which facilitated electron transfer to the TiO(2)surface and improved the photocatalytic activity of the composites. ThePDI-1/TiO(2)composite showed the highest photoactivity, and the activity remained at 86.4% after four reuse cycles. The extended pi-pi stacking of self-assembledPDI-1and the strong interactions between self-assembledPDI-1and 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 ofPDI-2prevented thePDI-2nucleus from contacting TiO(2)and weakened the interaction betweenPDI-2and TiO2, which further resulted in the low photoactivity ofPDI-2/TiO2. 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-杂环包封丙烯二酰亚胺掺杂TiO2（PDI-1 / TiO 2），1-苯酚-N，N'-二环己基珀苯-3,4,9,10-四羧酸使用水热合成方法合成二酰亚胺掺杂TiO 2（PDI-2 / TiO 2），AndN，N'-二氯己基偏二酰亚胺掺杂TiO2（PDI-3 / TiO 2）。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OFPDI-3 / TiO2。这是因为PDI-1NANORODS和PDI-2NANOBELTS的大表面积延伸了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。 ThePDI-1 / TiO（2）复合材料显示出最高的光活性，并且在四个重用循环后，活性保持在86.4％。自我组装的扩展PI-PI堆叠堆叠自组装平坦-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。苯氧基取代基在PDI-2PREVENTEDPDI-2nuckue的苯氧基取代基的空间障碍来自接触TiO（2）并削弱了PDI-2和TiO2之间的相互作用，这进一步导致了PDI-2 / TiO2的低光活性。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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  • 来源
    《RSC Advances》 |2020年第39期|共14页
  • 作者

    Zhang Fengxia; Li Wenjing; Jiang Tianyi; Li Xuemei; Shao Yuanyuan; Ma Yongshan; Wu Junsen;

  • 作者单位

    Shandong Jianzhu Univ Sch Municipal &

    Environm Engn Jinan 250101 Shandong Peoples R China;

    Shandong Jianzhu Univ Sch Municipal &

    Environm Engn Jinan 250101 Shandong Peoples R China;

    Shandong Jianzhu Univ Sch Municipal &

    Environm Engn Jinan 250101 Shandong Peoples R China;

    Shandong Jianzhu Univ Sch Municipal &

    Environm Engn Jinan 250101 Shandong Peoples R China;

    Shandong Jianzhu Univ Sch Municipal &

    Environm Engn Jinan 250101 Shandong Peoples R China;

    Shandong Jianzhu Univ Sch Municipal &

    Environm Engn Jinan 250101 Shandong Peoples R China;

    Shandong Jianzhu Univ Sch Municipal &

    Environm Engn Jinan 250101 Shandong Peoples R China;

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