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首页> 外文期刊>Energy, Ecology and Environment >Visible light-driven photocatalytic reduction of chromium (VI) using TiO2-modified carbon sphere hybrid photocatalyst
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Visible light-driven photocatalytic reduction of chromium (VI) using TiO2-modified carbon sphere hybrid photocatalyst

机译：可见light-driven光催化还原的铬(VI)使用TiO2-modified碳球混合光催化剂

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Carbon spheres (CS) were synthesized by simple hydrothermal route and further modified with TiO2 shell (CSTS) to demonstrate photocatalytic reduction of Cr(VI). The bare CS and CSTS were characterized with X-ray diffraction, Raman spectroscopy, field emission scanning electron microscope, transmission electron microscope, Fourier transform infrared spectroscopy, UV-vis diffuse reflectance spectroscopy and steady-state photoluminescence. The hybrid CSTS photocatalyst showed improved visible light photocatalytic reduction toward Cr(VI), compared with pristine TiO2 and commercial TiO2 (P25). Porous CS catalysts when modified with TiO2 shell shows 100% reduction of Cr(VI) in 4 h under visible light illumination. Also enhanced visible light photocurrent (similar to threefold) is observed for CSTS photocatalyst as compared to bare CS photocatalyst. Modification of TiO2 shell on carbon sphere suppresses the recombination of photogenerated excitons (e(-)/h(+)) as revealed from the photoluminescence study and enhanced light absorption due to scattering of light by the sphere framework of TiO2 shell and CS, thus enhancing the overall photocatalytic activity.
机译：碳球(CS)被简单的合成热液通道,进一步修改与二氧化钛shell(花旗软件)来演示光催化减少铬(VI)。特征与x射线衍射、拉曼光谱学、场发射扫描电子显微镜、透射电子显微镜、傅里叶变换红外光谱、紫外可见漫反射光谱和稳态光致发光。显示提高可见光的光催化对铬(VI)减少,而原始二氧化钛和商业二氧化钛(P25)。催化剂改性二氧化钛壳时显示减少100%的铬(VI) 4 h下可见光照明。光电流(类似于3倍)花旗软件为光催化剂比裸露的CS光催化剂。碳球的复合抑制photogenerated激子(e(-) /小时(+))显示光致发光的研究和提高由于散射光的光吸收二氧化钛壳CS的领域框架,因此提高整体的光催化活性。

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