g-C3N4/ZnCr-LDH复合材料制备及光催化降解甲基橙废水性能研究

采用原位合成的方法成功制备了一系列不同配比的g-C3 N4/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-C3 N4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-C3 N4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.

Preparation of g-C3N4/ZnCr-LDH Composites and Its Photocatalytic Degradation of Methyl Orange Wastewater

A series of g-C3 N4/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-C3 N4 .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 .