【摘要】 石墨相氮化碳（g-C₃N₄）以其独特的电子结构和化学特性引起了广泛关注。以双氰胺和硝酸铁为原料,制备了Fe改性的石墨相氮化碳（Fe/g-C₃N₄）,采用红外光谱、XRD和N₂吸附-脱附等分析手段对g-C₃N₄和Fe/g-C₃N₄进行了表征,并用以催化苯酚羟基化反应合成二酚,研究了Fe/g-C₃N₄催化性能的影响因素。结果表明,Fe/g-C₃N₄材料具有良好的介孔结构,Fe的引入改变了g-C₃N₄层状结构的层间距。当苯酚/H₂O₂摩尔比为2/1、铁负载量为0.7%（质量分数）、反应温度为50℃、反应时间为6 h时,苯酚的转化率达到39.7%,邻苯二酚和对苯二酚的总选择性为85.8%。重复实验结果证实该催化剂可以重复使用。更多还原

【Abstract】 Graphitic carbon nitride（g-C₃N₄）, possessing unique electronic and chemical properties, has attracted extensive attention from researchers. By using ferric nitrate and dicyandiamide as precursors, a series of Fe modified graphitic carbon nitride（Fe/g-C₃N₄） were prepared and used for catalyzing the hydroxylation of phenol to dihydroxybenzene. Fe/g-C₃N₄ and g-C₃N₄ were characterized by FT-IR spectra, XRD and N₂ absorption-desorption isotherms. Effects of reaction conditions on the catalytic performance of Fe/g-C₃N₄ were studied. Results show that Fe/g-C₃N₄ has uniform mesoporous structure and the layer spacing of g-C₃N₄ is changed after the introduction of Fe. Under optimized conditions, 39.7% phenol conversion and 85.8% catechol and hydroquinone selectivity are obtained, with Fe mass fraction of 0.7%, molar ratio of phenol to H₂O₂ of 2/1, reaction temperature of 50 ℃, and reaction time of 6 h. The reusability of the Fe/g-C₃N₄ catalyst is very good by the recycling test.更多还原