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首页> 外文期刊>RSC Advances >A novel n-type CdS nanorods/p-type LaFeO3 heterojunction nanocomposite with enhanced visible-light photocatalytic performance
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A novel n-type CdS nanorods/p-type LaFeO3 heterojunction nanocomposite with enhanced visible-light photocatalytic performance

机译：具有增强的可见光光催化性能的新型n型CdS纳米棒/ p型LaFeO3异质结纳米复合材料

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In this work, a novel n-type CdS nanorods/p-type LaFeO _(3) (CdS NRs/LFO) nanocomposite was prepared, for the first time, via a facile solvothermal method. The as-prepared n-CdS NRs/p-LFO nanocomposite was characterized by using powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), energy-dispersive X-ray spectroscopy (EDX), UV-visible diffuse reflection spectroscopy (DRS), vibrating sample magnetometry (VSM), photoluminescence (PL) spectroscopy, and Brunauer–Emmett–Teller (BET) surface area analysis. All data revealed the attachment of the LFO nanoparticle on the surface of CdS NRs. This novel nanocomposite was applied as a novel visible light photocatalyst for the degradation of methylene blue (MB), rhodamine B (RhB) and methyl orange (MO) dyes under visible-light irradiation. Under optimized conditions, the degradation efficiency was 97.5% for MB, 80% for RhB and 85% for MO in the presence of H _(2) O _(2) and over CdS NRs/LFO nanocomposite. The photocatalytic activity of CdS NRs/LFO was almost 16 and 8 times as high as those of the pristine CdS NRs and pure LFO, respectively. The photocatalytic activity was enhanced mainly due to the high efficiency in separation of electron–hole pairs induced by the remarkable synergistic effects of CdS and LFO semiconductors. After the photocatalytic reaction, the nanocomposite can be easily separated from the reaction solution and reused several times without loss of its photocatalytic activity. Trapping experiments indicated that ·OH radicals were the main reactive species for dye degradation in the present photocatalytic system. On the basis of the experimental results and estimated energy band positions, the mechanism for the enhanced photocatalytic activity was proposed.
机译：在这项工作中，首次通过简便的溶剂热方法制备了一种新型的n型CdS纳米棒/ p型LaFeO_（3）（CdS NRs / LFO）纳米复合材料。通过使用粉末X射线衍射（XRD），傅立叶变换红外光谱（FT-IR），X射线光电子能谱（XPS），扫描电子显微镜（SEM）对制备的n-CdS NRs / p-LFO纳米复合材料进行表征），高分辨率透射电子显微镜（HR-TEM），能量色散X射线光谱法（EDX），紫外可见漫反射光谱法（DRS），振动样品磁力法（VSM），光致发光（PL）光谱和Brunauer –Emmett–Teller（BET）表面积分析。所有数据都显示LFO纳米颗粒附着在CdS NRs表面。该新型纳米复合材料被用作新型可见光光催化剂，用于在可见光照射下降解亚甲基蓝（MB），若丹明B（RhB）和甲基橙（MO）染料。在优化的条件下，在H_（2）O_（2）存在下和在CdS NRs / LFO纳米复合材料上，MB的降解效率为97.5％，RhB的降解效率为85％，MO的降解效率为85％。 CdS NRs / LFO的光催化活性分别是原始CdS NRs和纯LFO的近16倍和8倍。光催化活性的提高主要归因于CdS和LFO半导体的显着协同效应引起的电子-空穴对的高效分离。在光催化反应之后，可以容易地将纳米复合材料与反应溶液分离并重复使用几次，而不会损失其光催化活性。诱捕实验表明，·OH自由基是目前光催化体系中染料降解的主要反应物种。根据实验结果和估计的能带位置，提出了增强光催化活性的机理。

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