甲酸铵处理对氮化碳光催化性能的影响  

Influence of ammonium formate treatment on photocatalytic performance of carbon nitride

作　　者：郭翔宇 柳成荫 李晓强[1] 高龙钰 许兆怡 Guo Xiangyu;Liu Chengyi;Li Xiaoqiang;Gao Longyu;Xu Zhaoyi(School of Environmental and Material Engineering,Yantai University,Yantai 264005,Shandong,China.)

机构地区：[1]烟台大学环境与材料工程学院,山东烟台264005

出　　处：《工业催化》2024年第2期48-53,共6页Industrial Catalysis

摘　　要：石墨相氮化碳(g-C_(3)N_(4))作为环境友好型材料在半导体光催化领域广受关注,然而未经改性的g-C_(3)N_(4)光吸收范围窄,仅能对太阳光谱中蓝紫光区响应,同时比表面积小,且光生载流子分离及迁移速率慢,导致光催化性能不佳。本文以g-C_(3)N_(4)为研究对象,将甲酸铵(NH_(4)HCO_(2))和硫脲(CH_(4)N_(2)S)按不同比例混合,在马弗炉中520℃下高温煅烧(升温4 h保温2 h),制得C元素掺杂的石墨相氮化碳。g-C_(3)N_(4)中掺杂C元素可提高光吸收能力、调整电荷密度、促进光生载流子解离,从而显著提高其光催化效率。通过降解模拟污染物罗丹明B(RhB)发现,当n(CH_(4)N_(2)S)∶n(NH_(4)HCO_(2))=1∶0.04时表现出最好的光催化活性,其对罗丹明B的降解效率几乎能达到100%,反应速率常数是未改性g-C_(3)N_(4)的2.4倍。As an environmentally friendly material,graphitic carbon nitride(g-C_(3)N_(4))has attracted much attention in the field of semiconductor photocatalysis.However,the unmodified g-C_(3)N_(4)has a narrow light absorption range,only responding to the blue-violet region of the solar spectrum,small specific surface area,and slow rate of photogenerated carrier separation and migration,which result in poor photocatalytic performance.In this work,g-C_(3)N_(4)was used as the research object.Ammonium formate(NH_(4)HCO_(2))and thiourea(CH_(4)N_(2)S)were mixed in different ratios,held at the elevated temperature for 4 h to 520℃,and calcined at this temperature in a muffle furnace for 2 h to produce C doped graphitic-phase carbon nitride.C-doping of g-C_(3)N_(4)can enhance the light-absorbing ability,adjust the charge density,and promote the dissociation of photogenerated carriers,which significantly improve the photocatalytic efficiency of g-C_(3)N_(4).Degradation of simulated pollutant rhodamine B(RhB)showed that the best photocatalytic activity was exhibited when the molar ratio of CH_(4)N_(2)S∶NH_(4)HCO_(2)was 1∶0.04.Under the mentioned condition,degradation efficiency of rhodamine B could reach almost 100%,and the reaction rate constant was 2.4 times higher than of the pure phase g-C_(3)N_(4).

关 键 词：催化剂工程 石墨相氮化碳 光催化 碳掺杂 

分 类 号：TQ034[化学工程] O643.36[理学—物理化学]