Abstract

In this work, graphitic carbon nitride doped by chlorine was prepared by a two-stage procedure for the first time. At the first stage, melamine was hydrothermally treated with glucose; at the second stage, the resulting precursor was calcined in a mixture with ammonium chloride. The obtained samples were studied using a set of physicochemical methods, such as X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy, and photoelectrochemical methods. All of the synthesized photocatalysts were tested in the reaction of photocatalytic hydrogen production from basic solutions of triethanolamine. The highest rates of hydrogen evolution and short-circuit current densities were obtained with a photocatalyst prepared by the calcination of a mixture consisting of 30% ammonium chloride and 70% melamine. The catalytic activity of this sample was 1332 μmol h^–1 g^–1, and it was higher than the catalytic activity of carbon nitride prepared by the calcination of melamine without pretreatment by a factor of 22.

中文翻译：

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新型两步法制备氯掺杂石墨碳氮化物用于光催化析氢和光生电流

摘要

在这项工作中，首次通过两步法制备了氯掺杂的石墨氮化碳。第一阶段，用葡萄糖对三聚氰胺进行水热处理；在第二阶段，将所得前体在与氯化铵的混合物中煅烧。使用一系列物理化学方法对获得的样品进行研究，例如X射线衍射（XRD）分析、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、漫反射光谱、和光电化学方法。所有合成的光催化剂均在三乙醇胺碱性溶液光催化制氢反应中进行了测试。通过煅烧由 30% 氯化铵和 70% 三聚氰胺组成的混合物制备的光催化剂获得了最高的析氢速率和短路电流密度。该样品的催化活性为1332 μmol h^–1 g ^–1，比未经预处理的三聚氰胺煅烧制备的氮化碳的催化活性高22倍。