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首页> 外文期刊>CERAMICS INTERNATIONAL >TiO_2 wrapped graphene as a high performance photocatalyst for acid orange 7 dye degradation under solar/UV light irradiations
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TiO_2 wrapped graphene as a high performance photocatalyst for acid orange 7 dye degradation under solar/UV light irradiations

机译：TiO_2包裹的石墨烯作为高性能光催化剂，可在太阳/紫外线照射下降解酸性橙7染料

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We have reported a simple strategy for the fabrication of titanium dioxide (TiO_2)-graphenc (GR) (TiO_2-GR) nanocomposites towards improvement in the photocatalytic ability under both UV and solar light irradiations. The structural properties of the nanocomposite has been characterized by a series of techniques, including Fourier Transform Infrared (FTIR) spectroscopy, Raman Spectroscopy, X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Transmission Scanning Electron Microscopy (TEM), UV-vis Diffuse Reflectance Spectra (UV-DRS), Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS) and Photolumincscence spectra (PL). The photocatalytic activity of the TiO_2-GR nanocomposite catalyst was assessed by examining the degradation of acid orange 7 (AO7) dye from model aqueous solutions as a probe reaction under UV and solar light irradiations. Photodegradation experimental results indicated that the TiO_2-GR nanocomposite catalyst exhibited higher photocatalytic activity than that of TiO_2. The enhanced photodegradation activity might be mainly attributed to the role of GR played as electron acceptor and transporter in the composite film, which effectively suppressed the charge recombination and promoted the charge transfer within the composite. Moreover, organic compounds as intermediates of the degradation process were identified by ESI/MS. A possible reaction pathway for the degradation of AO7 was suggested by the evidence presented in this study.
机译：我们已经报告了一种简单的策略来制备二氧化钛（TiO_2）-石墨烯（GR）（TiO_2-GR）纳米复合材料，以提高在紫外线和太阳光照射下的光催化能力。纳米复合材料的结构特性已通过一系列技术进行了表征，包括傅立叶变换红外（FTIR）光谱，拉曼光谱，X射线衍射（XRD），场发射扫描电子显微镜（FE-SEM），透射扫描电子显微镜（TEM），紫外可见漫反射光谱（UV-DRS），循环伏安法（CV），电化学阻抗谱（EIS）和光致发光光谱（PL）。 TiO_2-GR纳米复合催化剂的光催化活性是通过检查模型水溶液中酸性橙7（AO7）染料在紫外线和太阳光照射下的探针反应的降解来评估的。光降解实验结果表明，TiO_2-GR纳米复合催化剂的光催化活性高于TiO_2。增强的光降解活性可能主要归因于GR在复合膜中作为电子受体和转运体的作用，有效抑制了电荷的复合并促进了复合物中电荷的转移。此外，通过ESI / MS鉴定了有机化合物作为降解过程的中间体。这项研究中提出的证据提示了AO7降解的可能反应途径。

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