Peptide-templated biomineralization of titanium dioxide toward improved light absorption and photodegradation activity
Peptide-templated biomineralization of titanium dioxide toward improved light absorption and photodegradation activity
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二氧化钛的肽模板生物矿化可改善光吸收和光降解活性
DOI：
10.1039/d2me00136e
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Murai Kazuki
中科院分区：
文献类型：
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作者：
Tsuchiya Ryosuke;Murai Kazuki
TiO 2的矿化以前已经通过使用几种有机模板控制TiO 2的形态和晶相来研究，但是模板的分子结构与矿化的TiO 2的功能性之间的关系还没有报道。在这项研究中，我们研究了肽模板表面上不同官能团矿化的TiO 2的影响和光降解活性（即，Ac-（Val-Lys-Val-Lys-Val-Glu）3-CONH2：KE、Ac-（Val-Lys-Val-Lys-Val-Ser）3-CONH2：KS和Ac-（Val-Lys-Val-Lys-Val-Tyr）3-CONH2：KY）。KE-TiO 2和KS-TiO 2杂化物仅在UV区域（<380 nm）表现出吸收，而KY-TiO 2杂化物在延伸到可见光谱（<500 nm）的更宽波长区域中吸收。此外，由于电子和空穴之间的有效分离，KS-TiO 2杂化物显示出比其他系统更高的自光敏降解活性，而KY-TiO 2杂化物不仅显示出由于亚甲基蓝+stec自由基阳离子（MB+ stec）与注入电子之间的复合而降低的自光敏降解活性，而且在UV或可见光照射下的光催化活性增加。我们的研究结果表明，生物矿化二氧化钛提出了一个很好的和非常有吸引力的方法，进一步功能化和优化二氧化钛通过一个廉价和简便的过程，这将发现使用在所有的研究领域，利用二氧化钛为这样的目的。
The mineralization of TiO2 has been previously investigated by controlling the morphology and crystal phase of TiO2 using several organic templates, but the relationship between the molecular structure of the template and the functionality of the mineralized TiO2 has not been reported. In this study, we investigated the influence and photodegradation activity of the TiO2 mineralized by different functional groups on the peptide template surface (i.e., Ac-(Val-Lys-Val-Lys-Val-Glu)3-CONH2: KE, Ac-(Val-Lys-Val-Lys-Val-Ser)3-CONH2: KS, and Ac-(Val-Lys-Val-Lys-Val-Tyr)3-CONH2: KY). The KE–TiO2 and KS–TiO2 hybrids exhibited absorption only in the UV region (<380 nm), whereas the KY–TiO2 hybrid absorbed in a wider wavelength region that stretched into the visible spectrum (<500 nm). In addition, the KS–TiO2 hybrid showed a higher self-photosensitized degradation activity than the other systems owing to an efficient separation between electrons and holes, whereas the KY–TiO2 hybrid showed not only a reduction in self-photosensitized degradation activity due to the recombination between the methylene blue+˙ radical cation (MB+˙) and the injected electron, but also an increase in photocatalytic activity under UV or visible light irradiation. Our findings show that biomineralizing TiO2 presents an excellent and highly attractive approach to further functionalizing and optimizing TiO2via an inexpensive and facile process, which will find use in all research fields that utilize TiO2 for such purposes.