Co-MOF-74@g-C_(3)N_(4)催化剂的制备及其光催化性能研究

Preparation and photocatalytic performance of Co-MOF-74@g-C _(3)N _(4)

采用简单的自组装法成功合成出一种新型g-C_(3)N_(4)基复合光催化剂Co-MOF-74@g-C_(3)N_(4),用FT-IR、XRD、SEM和BET对催化剂的结构和形貌进行了表征,研究了Co-MOF-74@g-C_(3)N_(4)对有机染料甲基橙的光催化降解性能,探究了光催化反应可能的机理.研究结果显示:经模拟太阳光照射90min后,复合光催化剂Co-MOF-74@g-C_(3)N_(4)对10mg/L的甲基橙水溶液的降解率达到82.48%,分别是单一Co-MOF-74和g-C_(3)N_(4)的3.15倍和1.52倍,经过5次循环实验后,Co-MOF-74@g-C_(3)N_(4)对甲基橙的光催化降解率仍然保持在80.92%,可重复使用.Co-MOF-74和g-C_(3)N_(4)之间异质结的构建,增加了催化活性位点,提高了可见光的利用效率,也有利于载流子在异质界面聚集并快速分离,使得复合光催化剂Co-MOF-74@g-C_(3)N_(4)具有优异的光催化活性和稳定性.

In this paper,a novel g-C_(3)N_(4)-based composite photocatalyst Co-MOF-74@g-C_(3)N_(4)was successfully synthesized by a simple self-assembly method.The structure and morphology of the catalysts were characterized by FT-IR,XRD,SEM and BET,the photocatalytic degradation performance of Co-MOF-74@g-C_(3)N_(4)on the organic dye methyl orange was investigated,and the possible mechanism of the photocatalytic reaction were also probed.The results showed that after 90 min of simulated sunlight irradiation,the degradation rate of 10 mg/L methyl orange aqueous solution by composite photocatalyst Co-MOF-74@g-C_(3)N_(4)reached 82.48%,which was 3.15 and 1.52 times that of single Co-MOF-74 and g-C_(3)N_(4),respectively.After 5 cycles of experiments,the photocatalytic degradation rate of Co-MOF-74@g-C_(3)N_(4)for methyl orange remained at 80.92%,which could be reused.The construction of the heterojunction of Co-MOF-74 and g-C_(3)N_(4)increases the catalytic active site,improves the utilization efficiency of visible light,and facilitates the carrier aggregation and rapid separation at the heterointerface,which makes the composite photocatalyst Co-MOF-74@g-C_(3)N_(4)have excellent photocatalytic activity and stability.