Ag2O/g-C3N4复合材料的制备及其光催化性能研究

Study on Preparation and Photocatalytic Properties of Ag2O/g-C3N4 Composites

采用水热合成法制备Ag2O/g-C3N4复合光催化剂,通过XRD、SEM、EDS等手段对其进行表征,以亚甲基蓝模拟目标污染物,考察光催化剂种类、投加量和MB初始浓度对光催化活性的影响。结果表明,Ag2O沉积到g-C3N4的表面并发生明显的团聚,但未改变其晶体结构;在可见光照射180min后,当Ag2O/g-C3N4复合材料投加量为1.0g/L,MB初始浓度为15mg/L时,MB的降解率达到最高为95.97%;光催化降解过程符合准一级反应动力学模型;通过不同染料废水的降解实验分析,Ag2O/g-C3N4复合光催化剂具有广泛的适用性。

Ag2O/g-C3N4 composites were synthesized via a hydrothermal method.The as-prepared products were characterized by XRD,SEM and EDS.Methylene blue(MB)was utilized as model of pollutant to investigate the effect of composites types,amount and initial concentration of MB on photocatalytic activity of composites.The results showed that Ag 2O was successfully deposited on the surface of g-C3N4,occurring the obvious aggregation but not changing crystal structure.The degradation ratio of MB can be as high as 95.97%after 180 min under visible light irradiation when the amount of Ag 2O/g-C3N4 composites was 1.0 g/L and initial concentration of MB was 15 mg/L.The photocatalytic degradation process fitted well with first-order reaction kinetic model.The analysis of degradation experiments of different dye wastewater showed that Ag 2O/g-C3N4 composites had an extensive applicability.