Photocatalytic technology can effectively solve the increasingly serious water pollution problem,and its center is the design and synthesis of highly efficient photocatalytic materials.With titanium dioxide,sublimed sulfur powder,reducing iron powder as the raw materials,and anhydrous ethanol as the process control agent,FeS2/TiO2 composite nanomaterials with visible light response were synthesized by wet mechanochemical method.The prepared samples were characterized by field emission scanning electron microscope(FESEM-EDS),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).The influence of composite mode,calcination temperature,catalyst dosage,pollutant concentration and initial solution pH on photocatalytic degradation performance of the system were investigated.The results showed that the FeS2 generation,uniform combination of FeS2 and TiO2,S element doped into TiO2 lattice were achieved at same time.The 300 ℃ heat-treated FeS2/TiO2 has the best catalytic performance with pH of 4,catalyst dosage of 1 g/L and MB concentration of 20 mg/L,and its photocatalytic degradation rate is 15 times that of TiO2 and 1.8 times that of FeS2.It effectively improves the efficiency of treating typical pollutants in the chemical industryHeterojunction modification and S element doping have improved the energy level structure of TiO2,promoting effective separation and photocatalytic utilization of photo-generated electron-hole pairs in the composite system.
关键词
湿式机械化学合成/FeS2/TiO2/光催化/复合材料/亚甲基蓝
Key words
cet mechanochemical synthesis/FeS2/TiO2/photocatalysis/composite materials/methylene blue
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