WO₃@g-C₃N₄光催化剂的制备及降解抗生素的试验研究

Preparation of WO₃@g-C₃N₄ Photocatalyst and Experimental Study on Degradation of Antibiotics

摘要: 以偏钨酸铵和三聚氰胺为前驱体，通过混合煅烧，制得具有光催化性能的WO₃@g-C₃N₄复合材料。采用SEM、EDS对复合材料进行表征。研究结果表明，三聚氰胺与偏钨酸铵按比例研磨混合，在马弗炉中经过550˚煅烧3 h，制得WO3含量为5%的WO₃@g-C₃N₄复合材料。在室温条件下，当四环素浓度为20 mg/L，pH值为6，复合材料投加量为500 mg/L，打开冷却水，在250 W的长弧汞灯光下催化，时间为120 min时，于分光光度计下在357 nm处测定吸光度，对四环素的光催化降解率可达83%。

Abstract: WO₃@g-C₃N₄ composite with photocatalytic activity was prepared by calcination of ammonium metatungstate and melamine. The composite was characterized by SEM (electronic scanning mi-croscope) and EDS (electronic energy spectrum analysis). The results showed that the WO₃@g-C₃N₄ composite with WO₃ content of 5% was prepared by grinding and mixing melamine and ammonium metatungstate in proportion and calcining in muffle furnace at 550˚ for 3 h. At room temperature, when the concentration of tetracycline is 20 mg/l, pH value is 6, the dosage of composite material is 500 mg/l, cooling water is turned on, catalysis is carried out under 250 W long arc mercury light, and the time is 120 min. The absorbance is measured at 357 nm under the spectrophotometer. The photocatalytic degradation rate of tetracycline can reach 83%.