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首页> 外文期刊>RSC Advances >Ionic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+)
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Ionic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+)

机译：离子液体辅助水热合成Au掺杂的TiO 2 NPs，用于有效地从水中生产可见光光催化制氢，电化学检测和六价铬（Cr 6 + ）的光化学解毒

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Au/TiO2 NPs have been successfully prepared at 130 °C in one day using an ionic liquid assisted hydrothermal method using methoxyethyl methyl imidazolium methanesulfonate as the ionic liquid, titanium(IV) isopropoxide and tetrachloroaurate(III) trihydrate as precursors. Physico-chemical properties of the obtained photocatalysts were investigated via thorough characterizations. The framework substitution of Au in TiO2 NPs was established by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDS) techniques. X-ray diffraction (XRD) and transmission electron microscopy (TEM) image results confirmed the anatase phase and nanocrystalline nature of Au/TiO2. The optical properties revealed an extended tailing of the absorption edge toward the visible region upon Au doping. The concentration of Au in the TiO2 matrix has been fine-tuned to improve the hydrogen production, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+). But there are no reports utilizing a single material for all three applications such as photocatalytic hydrogen production from water and photochemical as well as electrochemical reduction of Cr6+ to Cr3+. The synergy between the Au and TiO2 has an optimum for concentration of 0.5 wt% Au doped TiO2. The optimized product has produced promising hydrogen evolution of 3344 μmol g?1 under illumination with a visible light source in a water/ethanol system. The optimized product has shown promising electrocatalytic reduction and the photocatalytic detoxification ability of the material towards Cr6+ was explored. Amperometric studies showed a linear range from 0.1 to 2.7 mM, and limits of detection and quantification of 0.01 mM and 0.023 mM, respectively. The Au/TiO2 nanoparticle modified glassy carbon has been used for electrochemical monitoring of Cr6+ in natural water samples. The material also showed better photochemical reduction of Cr6+ in sunlight compared to UV light.
机译：以甲氧基乙基甲基咪唑鎓甲磺酸盐为离子液体，钛（ small> IV ）异丙醇和四水金酸酯（ III ）三水合物作为前体。通过全面表征研究了所得光催化剂的理化性质。通过X射线衍射（XRD），X射线光电子能谱（XPS）和能量色散X射线能谱（ EDS）技术。 X射线衍射（XRD）和透射电子显微镜（TEM）图像结果证实了Au / TiO 2 的锐钛矿相和纳米晶性质。光学性质揭示了在Au掺杂时吸收边缘向可见区域的延伸拖尾。对TiO 2 基质中Au的浓度进行了微调，以提高六价铬（Cr 6 + ）。但是，尚无关于在所有三种应用中使用单一材料的报告，例如从水和光化学中光催化制氢以及将Cr 6 + 电化学还原为Cr 3 + 。 Au和TiO 2 之间的协同作用对于0.5重量％的Au掺杂TiO 2 的浓度具有最佳效果。优化的产品在水/乙醇系统中在可见光源的照射下产生了令人鼓舞的3344μmolg ？1 氢。优化后的产品具有良好的电催化还原性能，并探索了该材料对Cr 6 + 的光催化解毒能力。安培研究显示线性范围为0.1至2.7 mM，检出限和定量限分别为0.01 mM和0.023 mM。 Au / TiO 2 纳米粒子修饰的玻璃碳已用于天然水中Cr 6 + 的电化学监测样品。与紫外线相比，该材料在日光下还表现出更好的Cr 6 + 光化学还原性能。

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