Gold (Au) nanoparticles decorated zinc ferrite/reduced graphene oxide (ZnFe2O4@rGO) ternary composite was successfully synthesized and applied for the degradation of bromophenol blue dye and rhodamine B. The as-synthesized Au/ZnFe2O4@rGO ternary composite was confirmed by X-ray diffraction, UV–visible spectroscopy, and Transmission electron microscopy. The photocatalyst showed 96% degradation of bromophenol blue dye under sunlight at 180 min. Similarly, the composite photodegraded 94% of rhodamine B compared to the pure ZnFe2O4 (61%) and ZnFe2O4@rGO (76%) at 120 min. The photocatalytic activity of ternary composite was greatly increased compared to the pure ZnFe2O4 and ZnFe2O4@rGO due to the surface plasmon resonance effect of Au. The ZnFe2O4 is active under visible light to separate the photoexcited electron–hole pairs and accelerating the electron transfer. The catalyst stability did not decrease after four recycles. The as-prepared ternary composite catalyst could be applied to degrade the pollutant materials owing to its high efficiency in visible light and its excellent reusability.

中文翻译：

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Au/ZnFe2O4@rGO三元复合材料的等离子效应和电荷分离诱导的有机染料光催化降解

金 (Au) 纳米粒子装饰锌铁氧体/还原氧化石墨烯 (ZnFe2O4@rGO) 三元复合材料成功合成并应用于溴酚蓝染料和罗丹明 B 的降解。 X 证实合成的 Au/ZnFe2O4@rGO 三元复合材料射线衍射、紫外-可见光谱和透射电子显微镜。光催化剂在阳光下在 180 分钟时显示出 96% 的溴酚蓝染料降解。类似地，与纯 ZnFe2O4（61%）和 ZnFe2O4@rGO（76%）相比，复合材料在 120 分钟光降解了 94% 的罗丹明 B。由于 Au 的表面等离子体共振效应，与纯 ZnFe2O4 和 ZnFe2O4@rGO 相比，三元复合材料的光催化活性大大提高。ZnFe2O4 在可见光下具有活性，可分离光激发的电子-空穴对并加速电子转移。四次循环后催化剂稳定性没有降低。所制备的三元复合催化剂由于其在可见光下的高效性和良好的重复使用性，可用于降解污染物材料。