WO3/C/Ag3PO4复合材料光催化降解双酚A

WO3/C/Ag3PO4 composite for photocatalytic degradation of bisphenol A

摘要:

以磷酸法制备的活性炭、WO3、AgNO3、Na2HPO4为原料，采用共沉淀法制备WO3/C/Ag3PO4复合材料。采用X 射线衍射（XRD）、傅里叶红外光谱（FT-IR）、光电子能谱（XPS）、扫描电镜（SEM）、透射电镜（TEM）和固体紫外漫反射（UV-DRS）技术对其进行表征。结果表明，Ag3PO4与WO3之间形成异质结。在可见光照射下，以双酚A(BPA)模拟污染物，评价WO3/C/Ag3PO4复合材料的光催化降解性能，并提出 WO3/ C/Ag3PO4 复合材料对BPA的光降解机理。结果表明，在一系列光催化剂中， 23% WO3/ 7% C/ Ag3PO4 复合材料在可见光下对10 mg/L BPA水溶液的降解率在90 min分钟达到95%，明显高于单一的Ag3PO4和WO3。经过3次循环重复，BPA的降解率仍能保持在74%，表明WO3/C/Ag3PO4光催化剂具有良好的稳定性。光催化机理表明，自由基?O- 2和h 在降解过程中起主要作用。

Abstract:

WO3/C/Ag3PO4 composites were prepared by coprecipitation method with the basic materials of prepared activated carbon, WO3, AgNO3, Na2HPO4. The samples were characterized by XRD, FT-IR, XPS, SEM, TEM and UV-DRS techniques. The results showed that a heterojunction was formed between Ag3PO4 and WO3. The photocatalytic properties of WO3/C/Ag3PO4 composites were evaluated by using bisphenol A (BPA) to simulate pollutant under visible light irradiation, and the photodegradation mechanism of WO3/C/Ag3PO4 composite was proposed. The results shown that among a series of photocatalysts, the degradation rate of BPA in aqueous solution by 23% WO3/7%C/ Ag3PO4 composite reached 95% in 90 min under visible light, which was significantly higher than that of single Ag3PO4 and WO3. After three cycles of reuse, the degradation rate of BPA remained at 74%, indicating the good stability of WO3/C/Ag3PO4 photocatalyst. The research on photocatalytic mechanism indicated that the radicals of ?O- 2 and h play major roles in the degradation process.