类石墨相氮化碳的制备及光催化还原CO2性能  

Preparation of Graphitic Carbon Nitrides for Photocatalytically Reducing CO_2

作　　者：邵啸[1] 尹晓红[1] 杨晓晓[1] 韩啸[1] 张泷方 

机构地区：[1]天津理工大学化学化工学院,天津有机太阳能电池和光化学转化重点实验室,天津300384

出　　处：《精细化工》2017年第1期74-79,共6页Fine Chemicals

基　　金：国家自然科学基金(21176192)~~

摘　　要：分别以尿素、三聚氰胺为前驱体,采用缩聚法制备了不同形貌及性能的类石墨相氮化碳(g-C3N4)光催化剂,采用XRD、SEM、TEM、UV-Vis、FTIR、BET和荧光光谱对g-C_3N_4进行表征,考察了不同前驱体对催化剂形貌及在甲醇溶液中光催化还原CO_2效率的影响。结果表明:以尿素为前驱体制备的u-g-C_3N_4呈片状结构,光催化还原CO_2制备甲酸甲酯的效率较高,为512.8μmol/(gcat·h);以三聚氰胺为前驱体制备的m-g-C_3N_4呈块状结构,光催化效率为257.3μmol/(gcat·h)。Graphitic carbon nitride（g-C3N4） semiconductors with different morphologies and photocatalytic performance were prepared by polycondensation method,using urea and melamine as precursors,respectively.The prepared g-C3N4 semiconductors were characterized by XRD,SEM,TEM,UV-vis,FTIR,BET and PL.The influences of different precursor on morphologies and photocatalytic activity of g-C3N4 for reduction of CO2 in methanol under light irradiation were investigated.Furthermore,the influence of the precursor on the yield of prepared methyl formate（MF） was discussed.The results showed that u-g-C3N4 prepared with urea as a precursor had a sheet structure,and the yield of MF reached 512.8 μmol/（gcat·h）.Nevertheless that for m-g-C3N4 prepared with melamine as a precursor which had a blocky structure was only 257.3 μmol/（gcat·h）.

关 键 词：类石墨相氮化碳(g-C3N4) 光催化还原CO2 甲酸甲酯 尿素 三聚氰胺 催化技术 

分 类 号：O643.361[理学—物理化学]