石墨相氮化碳负载钴酞菁光催化还原二氧化碳的性能分析

Photocatalytic reduction of carbon dioxide by graphite-phase carbon nitride-loaded cobalt phthalocyanine

通过回流法将石墨相氮化碳(g-C_(3)N_(4))与四氨基钴酞菁(CoTAPc)相结合,制备出可以高效还原二氧化碳的复合催化剂CoTAPc/g-C_(3)N_(4)。利用扫描电子显微镜、透射电子显微镜以及X射线二维衍射仪等对CoTAPc/g-C_(3)N_(4)的微观形貌和晶体结构进行表征;利用荧光光谱和光电流测试对CoTAPc/g-C_(3)N_(4)的催化机理进行分析。表征测试表明,CoTAPc/g-C_(3)N_(4)的光吸收范围得到拓宽,光生电子与空穴的复合速度变慢,光能利用率得到提高。CoTAPc/g-C_(3)N_(4)的光催化还原二氧化碳性能测试结果表明:该催化剂在氙灯照射下具有较高的光催化还原二氧化碳活性,在12 h内CO的产量能够达到850.01μmol/g,在光催化还原二氧化碳领域具有发展潜力。

A composite catalyst CoTAPc/g-C_(3)N_(4)that can efficiently reduce carbon dioxide can be prepared,by combining the graphite-phase carbon nitride(g-C_(3)N_(4))with tetraaminocobalt phthalocyanine(CoTAPc)using the reflux method.Scanning electron microscopy,transmission electron microscopy,and X-ray two-dimensional diffractometry,etc.were used to characterize the microstructure and crystal structure of CoTAPc/g-C_(3)N_(4).The catalytic mechanism of CoTAPc/g-C_(3)N_(4)was analyzed by fluorescence spectroscopy and photocurrent test.The characterization test shows that the light absorption range of CoTAPc/g-C_(3)N_(4)is broadened,which effectively weakens the recombination between photogenerated electrons and holes and improves the utilization rate of light energy.In addition,the performance test results of the photocatalytic reduction of carbon dioxide by CoTAPc/g-C_(3)N_(4)indicate that this catalyst has a high photocatalytic reduction activity of carbon dioxide under the irradiation of an xenon lamp,and the yield of CO is up to 850.01μmol/g within 12 h.The catalyst has a development potential in the field of photocatalytic reduction of carbon dioxide.