Fe₂O₃ has received a lot of attention due to its low cost, easy doping regulation, and convenient recovery. However, the low utilization of visible light, and higher transition energy and electron hole recombination rate make it difficult to be used in photocatalysis. Herein, ZnFe₂O₄ with different Zn/Fe ratios (Z_xFO, x is the ratio of zinc atoms to iron atoms) was synthesized by a co-precipitation method, and applied to reduce U(VI) under visible light irradiation. Different ratios of zinc were deposited on iron oxide nanospheres to precisely regulate the growth of the ZFO spinel. ZFO exhibits a lower interfacial charge transfer resistance, meaning that it has a faster electron transfer rate at the solid–liquid interface. The uranium removal rate of ZFO can reach more than 94% within 80 h under sunlight (intensity = 88 000–95 000 LUX), and can even reach more than 90% at 28 h and 103 h on cloudy (intensity = 20 000–30 000 LUX) and rainy days (intensity < 10 000 LUX). The broadened visible light response enables ZFO to effectively absorb a wider spectrum of light, which is favorable for photocatalysis even under low light intensity. This study is of great significance for designing potential high efficiency photocatalysts to eliminate U(VI) pollutants in different weathers.

中文翻译：

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调整 Zn-Fe-O 纳米粒子的异质结构以在不同光强度下高效光催化去除 U(VI)


Fe ₂ O ₃ 由于其成本低廉、易于掺杂调控、回收方便而受到广泛关注。但可见光利用率低，且跃迁能和电子空穴复合率较高，使其难以应用于光催化。在此，通过以下方法合成了具有不同Zn/Fe比率（Z _x FO，x为锌原子与铁原子的比率）的ZnFe ₂ O ₄ 。共沉淀法，用于可见光照射下还原U(VI)。将不同比例的锌沉积在氧化铁纳米球上，以精确调节 ZFO 尖晶石的生长。 ZFO 表现出较低的界面电荷转移电阻，这意味着它在固液界面具有更快的电子转移速率。 ZFO在阳光下（强度=88 000~95 000 LUX）80 h内脱铀率可达94%以上，阴天（强度=20 000~ 30 000 LUX）和雨天（强度 < 10 000 LUX）。拓宽的可见光响应使ZFO能够有效吸收更宽的光谱，即使在低光强度下也有利于光催化。这项研究对于设计潜在的高效光催化剂来消除不同天气下的U(VI)污染物具有重要意义。