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首页> 外文期刊>RSC Advances >Synthesis and characterization of a core–shell BiVO4@g-C3N4 photo-catalyst with enhanced photocatalytic activity under visible light irradiation
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Synthesis and characterization of a core–shell BiVO4@g-C3N4 photo-catalyst with enhanced photocatalytic activity under visible light irradiation

机译：可见光下具有增强光催化活性的核-壳BiVO 4 @ g-C 3 N 4 光催化剂的合成与表征

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摘要

Novel core–shell structured ellipsoid-like BiVO4@g-C3N4 composites, with different amounts of g-C3N4, have been successfully prepared by a simple hydrothermal-chemisorption method. Their performance as photocatalysts was systematically evaluated during RhB degradation under visible light irradiation. The composite with 7 wt% g-C3N4 was found to be 7 times more efficient as a photocatalyst than pristine BiVO4. Its core–shell structure and activity were also found to be highly stable after it was used for 5 times in RhB degradation. The new composites were examined by various characterization techniques. The core–shell structure enhanced the contact area between the BiVO4 core and g-C3N4 nano-sheet shell, which provided more active sites and strengthened the chemical band interaction. The thin g-C3N4 nano-sheets reduced the charge carrier transfer distance, which further suppressed the recombination of the photo-induced electron–hole pairs and therefore enhanced the photocatalytic activity of the composites. A reaction mechanism of the photocatalytic RhB degradation was proposed and discussed in detail.
机译：新型核-壳结构椭球状BiVO 4 @gC 3 N 4 <已成功制备了不同量的gC 3 N 4 的/ sub> 复合材料通过简单的水热化学吸附方法。在可见光辐照下RhB降解过程中系统评估了它们作为光催化剂的性能。发现具有7 wt％gC 3 N 4 的复合物作为光催化剂的效率是其7倍原始的BiVO 4 。在将其用于RhB降解5次后，还发现其核-壳结构和活性非常稳定。通过各种表征技术检查了新的复合材料。核-壳结构增加了BiVO 4 核与gC 3 N < sub> 4 纳米片壳，提供了更多的活性位点并增强了化学键的相互作用。薄的gC 3 N 4 纳米片减小了电荷载流子的传输距离，从而进一步抑制了光诱导的电子-空穴对，因此增强了复合材料的光催化活性。提出并详细讨论了光催化RhB降解的反应机理。

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