【摘要】 采用水热法制备花球状Bi₂WO₆,通过扫描电镜、X射线衍射和紫外-可见光吸收对其进行表征。研究可见光条件下,反应体系pH、亚甲基蓝初始浓度和助催化剂对Bi₂WO₆光降解亚甲基蓝的性能影响。研究结果表明:碱性条件下,Bi₂WO₆光降解亚甲基蓝性能较好,在pH=13,0.10 g Bi₂WO₆对10 mg/L亚甲基蓝,降解60 min降解率可达到98.25%。加入助催化剂可以显著提高光催化活性,担载2%Pt助催化剂光催化降解性能最好,在pH=13,0.10 g Bi₂WO₆对50 mg/L亚甲基蓝,降解90min降解率可达到86.15%,比单独Bi₂WO₆光催化剂提高了49.52%。更多还原

【Abstract】 Flower globular Bi₂WO₆ photocatalyst was prepared by hydrothermal method and characterized by SEM, XRD, and Uv-vis. The effects of pH, initial concentration of methylene blue and co-catalyst on the photodegradation of methylene blue by Bi₂WO₆ were studied under visible light conditions. The results showed that under alkaline conditions, Bi₂WO₆ exhibited excellent photo-degration methylene blue performance. At pH=13, the photo-degradation rate of 10 mg/L methylene blue over 0.10 g Bi₂WO₆ reached 98.25 % after reaction of 60 min. Also, the addition of co-catalyst can significantly improve the photocatalytic activity. And by supported 2 % Pt co-catalyst over Bi₂WO₆, at pH=13, the photo-degradation rate of 50 mg/L methylene blue over reached to 86.15 % after degradation for 90 min, which was 49.52 % higher than the Bi₂WO₆ photocatalyst alone.更多还原