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首页> 外文期刊>RSC Advances >Gold nanoparticles immobilized on crystalline titanate fibres and shuttling effect of charges in solar photocatalysis
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Gold nanoparticles immobilized on crystalline titanate fibres and shuttling effect of charges in solar photocatalysis

机译：金纳米粒子固定在晶体钛酸盐纤维上和太阳光催化中电荷的穿梭效应

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This study focuses on understanding the intriguing nature of charge transfer processes between immobilized gold nanoparticles (AuNPs) and bi-crystalline titanate nanofiber substrates in solar light photocatalysis. Colloidal AuNPs with an average diameter of 20 nm were stably immobilized on titanate bi-crystals via casein-derived peptide linkers. The peptide linking method was adopted in order to attach the same amount of AuNPs onto two different bi-crystalline titanate fibres, i.e., H-titanate fibres with anatase patches (TiH-A) and TiO2-B fibres with anatase patches (TiB-A). The peptide cap surrounding the AuNPs was removed by combustion at 200 degrees C, leaving the AuNPs firmly bound to the titanate fibres. A pronounced charge transfer effect was observed in the photocatalysis investigation of the two types of bi-crystalline fibres. Facile shuttling of photoexcited charges between the anatase sheathed TiO2-B fibres and AuNPs contributed significantly to the solar photocatalytic performance. In contrast, anatase sheathed H-titanate fibres were ineffective for enhancing the photoactivity after immobilization of gold particles. H-titante and TiO2-B phases are known to be photocatalytically inactive under visible irradiation; however, alignment of the conduction band of TiO2-B with anatase in the decorated fibres facilitated shuttling of charges by precluding fast recombination of electrons and holes. When the TiO2-B phase was present in the bi-crystals, solar driven photocatalysis was enhanced, as evidenced by phenol degradation and photocurrent measurements.
机译：这项研究侧重于了解固定化的金纳米颗粒（AuNPs）和双晶钛酸酯纳米纤维底物之间在太阳能光催化中电荷转移过程的有趣性质。经由酪蛋白衍生的肽接头将平均直径为20nm的胶体AuNP稳定地固定在钛酸酯双晶体上。为了将相同量的AuNPs附着在两种不同的双晶钛酸酯纤维上，即采用具有锐钛矿斑的H-钛酸盐纤维（TiH-A）和具有锐钛矿斑的TiO2-B纤维（TiB-A），采用了肽连接方法）。通过在200摄氏度下燃烧除去AuNPs周围的肽帽，从而使AuNPs牢固地结合到钛酸酯纤维上。在两种类型的双晶纤维的光催化研究中观察到了显着的电荷转移效应。锐钛矿型包覆的TiO2-B纤维和AuNP之间的光激发电荷的快速穿梭显着促进了太阳能的光催化性能。相比之下，锐钛矿型H-钛酸酯纤维在固定金颗粒后不能有效提高光活性。已知H-二苯甲酸酯和TiO2-B相在可见光下具有光催化惰性。然而，修饰的纤维中TiO2-B的导带与锐钛矿的排列通过阻止电子和空穴的快速复合而促进了电荷的穿梭。当双晶体中存在TiO2-B相时，太阳能驱动的光催化作用会增强，这可通过苯酚降解和光电流测量来证明。

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