g-C_3N_4/ZnCr-LDH复合材料制备及光催化降解甲基橙废水性能研究

Preparation of g-C_3N_4/ZnCr-LDH Composites and Its Photocatalytic Degradation of Methyl Orange Wastewater

采用原位合成的方法成功制备了一系列不同配比的g-C_3N_4/ZnCr-LDH纳米复合材料,对其形貌、结构、及光电化学性质等进行系统分析,并在可见光下对其降解甲基橙的催化性能进行研究。结果表明,g-C_3N_4与ZnCr-LDH复合可增强可见光的吸收强度,有效抑制光生电子-空穴的复合,从而提高了复合光催化剂的活性。其中0.92CN/LDH复合光催化剂降解甲基橙的效率2 h达到了97%,比纯的g-C_3N_4提高了2倍。最后经过5次连续循环实验发现,复合光催化剂的降解活性还保持在80%以上,表明复合材料具有良好的稳定性。

A series of g-C3N4/ZnCr-LDH nanocomposites with different ratios were successfully prepared by in situ synthesis, the morphology, structure and photoelectrochemical properties were systematically studied, and the catalytic performance of the degradation of methyl orange was carried out under visible light. The results show that the combination of g-C3 N4 and ZnCr-LDH can enhance the absorption intensity of visible light, effectively inhibit the photo-electron-hole recombination, and improve the activity of the composite photocatalyst. The efficiency of degradation of methyl orange by 0. 92CN/LDH composite photocatalyst is 97% at 2 h, which is 2 times higher than that of pure g-CaN4. Finally, after 5 cycles of continuous experiments, it was found that the degradation activity of the composite photocatalyst is still above 80% , which indicate that the composite has good stability.