Facile synthesis of a novel full-spectrum-responsive Co2.67S4 nanoparticles for UV-, vis- and NIR-driven photocatalysis
Facile synthesis of a novel full-spectrum-responsive Co2.67S4 nanoparticles for UV-, vis- and NIR-driven photocatalysis
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DOI：
10.1016/j.apcatb.2016.08.064
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发表时间：
2017-03
影响因子：
22.1
通讯作者：
Zhenzhen Wu;Xingzhong Yuan;Hou Wang;Zhibin Wu;Longbo Jiang;Hui Wang;Lei Zhang;Zhihua Xiao
中科院分区：
文献类型：
--
作者：
Zhenzhen Wu;Xingzhong Yuan;Hou Wang;Zhibin Wu;Longbo Jiang;Hui Wang;Lei Zhang;Zhihua Xiao
由于污染问题日益严重，旨在通过光催化剂更好地收集太阳能以进行环境修复的研究一直在蓬勃发展。在这项研究中，通过简单的溶剂热路线制备了一种具有全光谱响应光催化活性的新型混合价态Co2.67S4纳米粒子。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、X射线光电子能谱（XPS）和紫外-可见-近红外漫反射光谱（UV-vis-NIR DRS）系统地表征了合成的样品。通过亚甲基蓝（MB）在水溶液中的降解来研究所获得样品的光催化性能。粒径为 5–20 nm 的 Co2.67S4 纳米颗粒在紫外光、可见光和近红外光照射下降解 MB 的效率分别为 64%、84% 和 68%。此外，还提出了一种可能的近红外光催化机制：Co2+/Co3+氧化还原电对在Co2.67S4的光催化活性中发挥着重要作用。这项研究为太阳光利用和环境修复提供了一种新型的全太阳光谱响应光催化剂。
Sparked by growing pollution issues, research aiming at a better harvesting of solar energy in photocatalysts for environmental remediation has been thriving. In this study, a novel mixed valence state of Co2.67S4nanoparticles with full-spectrum-responsive photocatalytic activity had been fabricated via a facile solvothermal route. The as-synthesized samples were systematically characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV–vis-NIR diffuse reflection spectroscopy (UV–vis-NIR DRS). The photocatalytic performance of as-obtained samples had been investigated by the degradation of methylene blue (MB) in aqueous solution. The Co2.67S4nanoparticles with the particle size of 5–20 nm could degrade MB with the efficiency of 64%, 84% and 68% under the UV light, visible light and near-infrared light exposure, respectively. Furthermore, a possible photocatalytic mechanism toward the near-infrared region had been proposed to be that the Co2+/Co3+redox couple played vital parts in the photocatalytic activity of Co2.67S4. This study provides a novel full solar spectrum-responsive photocatalyst for solar-light utility and environmental remediation.