Abstract

The present work studies the effect of zirconium dioxide addition in hydrozincite (Zn₅(OH₆)(CO₃)₂). The composites samples shows an efficient photocatalytic activity for H₂ production under UV light irradiation and employing methanol as a sacrificial reagent. The composites were synthesized in one-pot method, dried to 100 °C and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), elemental mapping by SEM and transmission electron microscopy (TEM). The most active composite with 3 mol% of ZrO₂ exhibited a H₂ production of 1908 μmol g⁻¹ h⁻¹ and an apparent quantum yield (AQY) of 41%. The photoactivity is attributed to the formation of heterojunctions, it is confirmed by the characterization techniques. The heterojunctions result in a synergic effect, the hydrozincite provides a wide surface area for electron transfer while the zirconium dioxide inhibits the recombination through the photogenerated holes attraction.

中文翻译：

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ZrO 2：Zn 5（OH）6（CO 3）2复合物光分解水制备H 2的光催化评价

摘要

本工作研究了在水合锌矿（Zn ₅（OH ₆）（CO ₃）₂）中添加二氧化锆的影响。该复合材料样品在紫外线照射下并使用甲醇作为牺牲剂对H _2的生产显示出有效的光催化活性。一锅法合成复合材料，干燥至100°C，并通过X射线衍射（XRD），傅立叶变换红外光谱（FTIR），UV-Vis漫反射光谱（UV-Vis DRS），X射线进行表征光电子能谱（XPS），扫描电子显微镜（SEM），通过SEM进行元素标测和透射电子显微镜（TEM）。具有3 mol％的ZrO _2的活性最高的复合材料H _2的产生量为1908μmolg ^-1  h ^-1，表观量子产率（AQY）为41％。光活性归因于异质结的形成，已通过表征技术得到证实。异质结产生协同作用，水锌矿为电子转移提供了广阔的表面积，而二氧化锆则通过光生空穴的吸引力抑制了重组。