SiO_2/g-C_3N_4复合光催化剂的制备及性能

• 作 者: 崔玉民 朱良俊 肖依 苗慧 师瑞娟 李慧泉
• 机 构: 阜阳师范学院化学与材料工程学院,安徽环境污染物降解与监测省级实验室,
• 出 处: 环境污染与防治
• 发表日期: 2016年06期
• 关键词: 复合光催化剂 SiO_2/g-C_3N_4 三聚氰胺 甲基橙 SiO2/g-C3N4 石墨相 光催化甲基橙 催化活性 光催化 可见光

以三聚氰胺为前驱体,采用热解法合成石墨相g-C_3N_4。将SiO_2与g-C_3N_4以不同质量比复合,采用煅烧法制备SiO_2/g-C_3N_4复合光催化剂。采用紫外—可见漫反射光谱(UVVis DRS)、光致发光光谱(PL)等对其进行表征。通过甲基橙的可见光催化降解,评价SiO_2/g-C_3N_4的可见光催化活性。当SiO_2在SiO_2/g-C_3N_4质量分数为13.0%时,SiO_2/gC_3N_4光催化活性最高,在该条件下,可见光照射2h,甲基橙的光催化脱色率达到45.8%。

Using melamine as precursor, the graphite phase g-C_3N_4 was synthesized by pyrolysis. The composite of SiO_2 and g-C_3N_4 with different mass ratios was prepared, and the SiO_2 / g-C_3N_4 composite photocatalyst was prepared by calcination. The samples were characterized by UV-Vis diffuse reflectance spectroscopy (UVVIS DRS) and photoluminescence spectroscopy (PL). Visible light photocatalytic activity of SiO_2 / g-C_3N_4 was evaluated by visible light photocatalytic degradation of methyl orange. Under the condition of SiO 2 / g-C 3 N 4 mass fraction of 13.0%, the photocatalytic activity of SiO 2 / gC 3 N 4 was the highest. Under these conditions, the photocatalytic decolorization rate of methyl orange reached 45.8% under visible light irradiation for 2 h.