Abstract

To improve the visible light absorption and photocatalytic activity of titanium dioxide nanotube arrays (TONTAs), ZnFe₂O₄ (ZFO) nanocrystals were perfused into pristine TONTA pipelines using a novel bias voltage-assisted perfusion method. ZFO nanocrystals were well anchored on the inner walls of the pristine TONTAs when the ZFO suspensions (0.025 mg mL⁻¹) were kept under a 60 V bias voltage for 1 h. After annealing at 750 °C for 2 h, the heterostructured ZFO/Fe₂TiO₅ (FTO)/TiO₂ composite nanotube arrays were successfully obtained. Furthermore, Fe³⁺ was reduced to Fe²⁺ when solid solution reactions occurred at the interface of ZFO and the pristine TONTAs. Introducing ZFO significantly enhanced the visible light absorption of the ZFO/FTO/TONTAs relative to that of the annealed TONTAs. The coexistence of type I and staggered type II band alignment in the ZFO/FTO/TONTAs facilitated the separation of photogenerated electrons and holes, thereby improving the efficiency of the ZFO/FTO/TONTAs for photocatalytic degradation of methylene blue when irradiated with simulated sunlight.

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中文翻译：

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异质结构的ZnFe2个Ø4/铁2个二氧化钛5/钛2个 模拟的阳光照射下具有改善的光催化降解效率的复合纳米管阵列。

摘要

为了提高二氧化钛纳米管阵列（TONTAs）的可见光吸收和光催化活性，使用新颖的偏压辅助灌注方法将ZnFe ₂ O ₄（ZFO）纳米晶体灌注到原始的TONTA管道中。当将ZFO悬浮液（0.025 mg mL ^-1）在60 V偏置电压下保持1 h时，ZFO纳米晶体被良好地锚固在原始TONTA的内壁上。在750℃下退火2h后，成功获得了异质结构的ZFO / Fe ₂ TiO ₅（FTO）/ TiO ₂复合纳米管阵列。此外，Fe ³⁺被还原为Fe ²⁺当ZFO和原始TONTA的界面发生固溶反应时。相对于退火的TONTA，引入ZFO显着提高了ZFO / FTO / TONTA的可见光吸收率。ZFO / FTO / TONTA中I型和II型交错带的共存促进了光生电子和空穴的分离，从而提高了ZFO / FTO / TONTAs在模拟太阳光照射下对亚甲基蓝光催化降解的效率。

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