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首页> 外文期刊>RSC Advances >Highly efficient Ag6Si2O7/WO3 photocatalyst based on heterojunction with enhanced visible light photocatalytic activities
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Highly efficient Ag6Si2O7/WO3 photocatalyst based on heterojunction with enhanced visible light photocatalytic activities

机译：高效AG6SI2O7 / WO3光催化基于异质结具有增强的可见光光催化活动

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Ag _(6) Si _(2) O _(7) /WO _(3) photocatalysts were prepared by an ultrasound-assisted precipitation method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS) and photoluminescence (PL) spectroscopy. The effects of Ag _(6) Si _(2) O _(7) /WO _(3) mole ratios on photocatalytic activity of Ag _(6) Si _(2) O _(7) /WO _(3) were investigated. The results showed that the photocatalytic degradation efficiency of methylene blue (MB) by Ag _(6) Si _(2) O _(7) /WO _(3) (1?:?1) attains 97.4%, which is much higher than that (87.3%) by sole Ag _(6) Si _(2) O _(7) and that (14.0%) by sole WO _(3) after visible light irradiation for 30 min, and the apparent rate constant is 1.59 times that of sole Ag _(6) Si _(2) O _(7) and 44.6 times that of sole WO _(3) . Photocatalytic activities of different photocatalysts with the same weight of visible-light-active components were compared and showed that the rate constant of Ag _(6) Si _(2) O _(7) /WO _(3) (1?:?1) is 2.88 times that of mathematical sum of Ag _(6) Si _(2) O _(7) and WO _(3) . Moreover, rhodamine B (RhB), methyl orange (MO) and 2,4-dichlorophenol were also effectively degraded. After 3 recycling runs, the photocatalytic performance of the Ag _(6) Si _(2) O _(7) /WO _(3) (1?:?1) was still effectively maintained. In addition, the quenching effects of different scavengers proved that the ˙OH plays important roles in the photocatalytic reaction under visible light irradiation. The visible light photocatalytic activity enhancement of the Ag _(6) Si _(2) O _(7) /WO _(3) (1?:?1) came from the efficient separation of electron–hole pairs, which resulted from the heterojunction of Ag _(6) Si _(2) O _(7) /WO _(3) . These results indicate that Ag _(6) Si _(2) O _(7) /WO _(3) heterojunction is highly efficient photocatalyst and there is a significant potential in the degradation of organic contaminants under visible light irradiation.
机译：Ag _（6）Si _（2）O _（7）/ WO _（3）光催化剂通过超声辅助沉淀方法制备，并通过X射线衍射（XRD），现场发射扫描电子显微镜（Fe- SEM），能量分散光谱（EDS），X射线光电子能谱（XPS），UV-VI扩散反射谱（DRS）和光致发光（PL）光谱。 Ag _（6）Si _（2）o _（7）/ wo _（3）摩尔比在Ag _（6）Si _（2）o _（7）/ WO _（3）的光催化活性上对光催化活性的影响）被调查了。结果表明，Ag _（6）Si _（2）O _（7）/ WO _（3）（1？：1）达到97.4％的亚甲基蓝（Mb）的光催化降解效率通过唯一Ag _（6）Si _（2）O _（7）高于（87.3％）（14.0％）（14.0％）通过唯一的WO _（3）在可见光照射30分钟后，表观速率恒定唯一Ag _（6）Si _（2）o _（7）和44.6倍的唯一ag _（3）的1.59倍。比较具有相同光催化剂的不同光催化剂的光催化活性，并且显示Ag _（6）Si _（2）O _（7）/ WO _（3）（1 ?: ？1）是Ag _（6）Si _（2）O _（7）和WO _（3）的数学总和的2.88倍。此外，还有效降解罗丹明B（RHB），甲基橙（Mo）和2,4-二氯苯酚。在3次回收运行后，仍然有效维持Ag _（6）Si _（2）o _（7）/ WO _（3）（3）（3）（3）（3）（3）（1？：1）仍然存在光催化性能。此外，不同清除剂的淬火效果证明了˙OH在可见光辐照下的光催化反应中起重要作用。 Ag _（6）Si _（2）O _（7）/ WO _（3）（1？：1）的可见光光催化活性增强来自电子孔对的有效分离，从而产生Ag _（6）Si _（2）O _（7）/ WO _（3）的异质结。这些结果表明Ag _（6）Si _（2）O _（7）/ WO _（3）异质结是高效的光催化剂，并且在可见光照射下有机污染物的降解存在显着潜力。

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