The treatment of phenol-containing wastewater is a hot topic in the field of environmental chemistry. In this work, the hydroxyl grafted graphite phase carbon nitride (g-C3[Formula: see text] was prepared by alkaline hydrothermal (AH) treatment, and its degradation of phenol under visible light was investigated. XRD, UV-Vis, FT-IR, XPS, N2 adsorption, PL, ESR, TPD and EIS were used to characterize the as-prepared catalysts. The results showed that the hydroxyl group grafting does not influence the crystal structure, optical property and specific surface area of catalyst. Compared with the hydroxyl group modified g-C3N4 prepared by H2O2 method, the alkali hydrothermal treatment can graft more hydroxyl groups onto the g-C3N4 surface, leading to the higher electron–hole separation efficiency. The as-prepared catalyst using this method had more surface negative charges and stronger adsorption capacity for the reaction substrate phenol. The g-C3N4 prepared by this alkali hydrothermal treatment displayed the phenol degradation rate constant of 0.22[Formula: see text]h[Formula: see text], which is 3.72 and 2.06 times higher than that of neat and H2O2 treated g-C3N4, as well as excellent catalytic stability and structural stability. The possible reaction mechanism was proposed.

中文翻译：

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碱水热处理合成具有优异光催化酚类化合物氧化能力的羟基改性g-C3N4

含酚废水的处理是环境化学领域的热门话题。在这项工作中，羟基接枝的石墨相氮化碳（gC3【分子式：见正文】采用碱性水热（AH）处理制备，并对其在可见光下降解苯酚进行了考察。XRD、UV-Vis、FT-IR、XPS、N2吸附、PL、ESR、TPD和EIS用于表征所制备的催化剂。结果表明，羟基接枝不影响催化剂的晶体结构、光学性质和比表面积。与羟基修饰的gC相比3ñ4由 H 准备2○2方法，碱水热处理可以将更多的羟基接枝到gC上3ñ4表面，导致更高的电子 - 空穴分离效率。采用该方法制备的催化剂表面负电荷较多，对反应底物苯酚具有较强的吸附能力。气相色谱仪3ñ4该碱水热处理制备的苯酚降解速率常数为0.22[公式：见正文]h[公式：见正文]，分别是纯碱和H的3.72倍和2.06倍2○2处理过的气相色谱3ñ4，以及优异的催化稳定性和结构稳定性。提出了可能的反应机理。