摘要
采用一步水热法合成了CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3)三元复合光催化剂。样品中仅含有CaFe_(2)O_(4)、CaSO_(4)和Fe_(2)O_(3),无其他杂质存在。CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3)三元复合光催化剂呈花状,主要由一些细颗粒黏连而成。结果表明,Fe_(2)O_(3)、CaFe_(2)O_(4)、CaSO_(4)和CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3)三元复合光催化剂的带隙能(E_(g))分别为1.83、1.85、3.69/4.29、1.35/2.64 eV;CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3)具有较强的紫外可见光吸收能力、较强的电荷转移能力及较高的分离效率,是一种潜在的紫外可见光催化剂。光催化对比实验表明,CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3)三元复合光催化剂在降解甲基橙有机染料方面具有较强的紫外可见光催化活性。循环降解实验表明,CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3)三元复合光催化剂具有高的稳定性。在光催化降解过程中,空穴、羟基自由基和超氧自由基的协同作用使该催化剂具有高的光催化活性。
CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3) ternary composite photocatalyst was synthesized by one-step hydrothermal method.The sample only contained CaFe_(2)O_(4),CaSO_(4) and Fe_(2)O_(3),without other impurities.CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3) ternary com-posite photocatalyst was flower-like,mainly composed of some fine particles bonding together.The band gap(E_(g))of Fe_(2)O_(3),CaFe_(2)O_(4),CaSO_(4),and ternary composite CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3) photocatalyst were 1.83,1.85,3.69/4.29 and 1.35/2.64 eV,respectively.Compare with Fe_(2)O_(3),CaFe_(2)O_(4) and CaSO_(4),the ternary composite CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3) photocatalyst had strong absorption capacity of UV-visible light,strong charge transfer ability and high separation efficiency,and was a potential UV-visible photocatalyst.The comparative study of photocatalytic experiment showed that ternary composite CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3) photocatalyst had strong UV-visible photocatalytic activity in the degradation of methyl orange organic dyes.Cyclic degradation experiments showed that CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3) ternary composite photocatalyst had high stability.In the photocatalytic degradation process,the synergistic effects of hole,hydroxyl radical and superoxide radical made the ternary composite CaFe_(2)O_(4)/CaSO_(4)/Fe_(2)O_(3) photocatalyst had high photocatalytic activity.
作者
张春燕
刘哲语
ZHANG Chunyan;LIU Zheyu(Shanxi Railway Vocational and Technical College,Taiyuan 030013,China;Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030128,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2022年第2期104-110,共7页
Industrial Water Treatment
基金
国家自然科学基金项目(21867015)
山西省应用基础研究计划青年科技研究基金(201801D221091)
关键词
水热法
光催化剂
光吸收能力
甲基橙
羟基自由基
hydrothermal method
photocatalyst
light absorption capacity
methyl orange
hydroxyl radical
