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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Rational combination of covalent-organic framework and nano TiO2 by covalent bonds to realize dramatically enhanced photocatalytic activity
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Rational combination of covalent-organic framework and nano TiO2 by covalent bonds to realize dramatically enhanced photocatalytic activity

机译：通过共价键对共价 - 有机框架和纳米TiO2的合理组合，实现显着增强的光催化活性

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摘要

Rationally combining the advantage of inorganic and organic semiconductors to construct a heterojunction is an effective way to boost the photocatalytic activity of materials, while it is still a great challenge to tightly integrate these two different components together. In this work, for the first time, the TpPa-1-COF, an excellent visible-light harvesting covalent-organic frameworks (COFs), and TiO2 were combined together by covalent bonds to construct a heterojunction. The resulting TiO2-TpPa-1-COF hybrid materials show efficient photocatalytic activity under visible light irradiation. Especially, TiO2-TpPa-1-COF (1:3) exhibits the optimized photocatalytic H-2 evolution rate of 11.19 mmol g(-1) h(-1) and apparent quantum efficiency of 7.6 % at lambda = 420 nm, which is 5.3 and 3.0 times higher than the TpPa-1-COF and TiO2/TpPa-1-COF, respectively. Further investigations confirm that the covalent connection between TiO2 and TpPa-1-COF components can largely improve the transfer of photogenerated charges of COF, leading to the efficient H-2 evolution activity.
机译：合理地结合了无机和有机半导体的优点，构建异质结是提高材料的光催化活性的有效方法，而将这两个不同的部件紧固在一起仍然是一个巨大的挑战。在这项工作中，首次通过共价键合在一起，首次使用TPPA-1-COF，优异的可见光收获共价 - 有机框架（COF）和TiO 2，以构建异质结。得到的TiO2-TPPA-1-COF混合材料在可见光照射下显示出高效的光催化活性。特别是，TiO2-TPPA-1-COF（1：3）表现出11.19mmol g（-1）H（-1）的优化光催化H-2演化速率，并且在Lambda = 420nm的表观量子效率为7.6％，分别比TPPA-1-COF和TiO2 / TPPA-1-COF高5.3和3.0倍。进一步的研究证实，TiO2和TPPA-1-COF组分之间的共价连接可以大大改善COF的光生电电荷的转移，导致有效的H-2进化活性。

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