摘要
以磷酸法制备的活性炭、WO_(3)、AgNO_(3)、Na_(2)HPO_(4)•12H_(2)O为原料,采用共沉淀法制备WO_(3)与C不同含量的系列WO_(3)/C/Ag_(3)PO_(4)复合材料。采用XRD、FTIR、XPS、SEM、TEM和固体紫外漫反射(UV-DRS)技术对其进行了结构表征。在可见光照射下,以双酚A(BPA)模拟污染物,评价WO_(3)/C/Ag_(3)PO_(4)复合材料的光催化降解性能,并提出WO_(3)/C/Ag_(3)PO_(4)复合材料对BPA的光降解机理。结果表明,Ag_(3)PO_(4)与WO_(3)之间形成了异质结。在一系列光催化剂中,20 mg的WO_(3)/C/Ag_(3)PO_(4)(1∶0.3∶3)(WO_(3)、C与Ag_(3)PO_(3)质量比为1∶0.3∶3)复合材料在可见光下对40 mL 10 mg/L BPA水溶液的降解率在90 min达到95%以上,明显高于单一的Ag_(3)PO_(4)和WO_(3)。经过3次循环实验,BPA的降解率仍能保持在74%,表明WO_(3)/C/Ag_(3)PO_(4)光催化剂具有较好的稳定性。光催化机理表明,•OH和空穴(h^(+))在降解过程中起主要作用。
A series of WO_(3)/C/Ag_(3)PO_(4)composites with different contents of WO_(3)and activated carbon prepared by phosphoric acid method were prepared by coprecipitation method with prepared activated carbon,WO_(3),AgNO_(3)and Na_(2)HPO_(4)•12H_(2)O as raw materials.The samples were characterized by XRD,FTIR,XPS,SEM,TEM and UV-DRS techniques.The photocatalytic properties of WO_(3)/C/Ag_(3)PO_(4)composites were evaluated by using bisphenol A(BPA)to simulate pollutant under visible light irradiation,and the photodegradation mechanism of WO_(3)/C/Ag3PO4 composites was proposed.The results showed that a heterojunction was formed between Ag_(3)PO_(4)and WO_(3).Among a series of photocatalysts,the degradation rate of 10 mg/L BPA(40 mL)aqueous solution by 20 mg WO_(3)/C/Ag_(3)PO_(4)(1∶0.3∶3)[m(WO_(3))∶m(C)∶m(Ag_(3)PO_(4))=1∶0.3∶3]composites reached more than 95%in 90 min under visible light,which was significantly higher than that by single Ag_(3)PO_(4)and WO_(3).After three cycles,the degradation rate of BPA remained at 74%,indicating WO_(3)/C/Ag_(3)PO_(4)photocatalyst had good stability.The research on photocatalytic mechanism indicated that•OH and hole(h^(+))played major roles in the degradation process.
作者
卜鑫焱
黄权龙
赵西连
高雯婷
陈丛瑾
李志霞
BU Xinyan;HUANG Quanlong;ZHAO Xilian;GAO Wenting;CHEN Congjin;LI Zhixia(Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology,School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,Guangxi,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2021年第3期496-503,共8页
Fine Chemicals
基金
国家自然科学基金(31660183)
广西石化资源加工及过程强化技术重点实验室开放基金(2020k003)。
关键词
双酚A
Ag3PO4
复合材料
异质结
光催化机理
功能材料
bisphenol A
Ag3PO4
composites
heterojunction
photocatalytic mechanism
functional materials
