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利用太阳能光解水制氢和降解有机污染物对解决能源和环境问题具有重要意义.本文通过“由上到下”水热法处理块状石墨相氮化碳(g-C_3N_4),得到棒状g-C_3N_4.采用X射线衍射分析(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、紫外-可见漫反射光谱(DRS)、傅里叶变换红外光谱(FTIR)、荧光光谱(PL)和比表面积测试(BET)等分析手段对棒状g-C_3N_4进行了表征.结果表明,棒状g-C_3N_4为长约2.4μm,宽约45 nm的棒状结构,该结构能增大g-C_3N_4的比表面积;同时观察到光生电子-空穴对的复合几率降低,并且由于缩聚程度的不同可能会影响能带结构.以可见光光催化降解亚甲蓝水溶液和光解水制氢的实验结果为依据评价了棒状g-C_3N_4的可见光催化活性,棒状g-C_3N_4的活性远优于块状g-C_3N_4.
It is of great significance to solve the problems of energy and environment by using solar light and water to degrade hydrogen and degrade organic pollutants.This paper deals with the process of nitrocarburized massive graphite phase (g-C_3N_4) by “top-to-bottom” The rod-shaped g-C_3N_4 was characterized by XRD, TEM, SEM, DRS, FTIR and fluorescence spectroscopy (G-C_3N_4) was characterized by means of PL, BET, etc. The results show that the rod-shaped g-C_3N_4 is a rod-like structure with a length of about 2.4μm and a width of about 45 nm, C_3N_4, and observed that the recombination probability of photogenerated electron-hole pairs decreased, and the band structure might be affected by the degree of polycondensation.Experimental results of visible light photocatalytic degradation of methylene blue aqueous solution and photolysis water were Based on the evaluation of the visible light catalytic activity of the rod-shaped g-C_3N_4, the activity of the rod-shaped g-C_3N_4 is much better than that of the bulk g-C_3N_4.