Effect Of Doping Modification And High Magnetic Field Treatment On The Photocatalytic Properties Of CaTiO₃

Titania-bearing blast furnace slag is solid waste from puddling using the Fan titanium magnetic iron mineral, As a slag waste of the metallurgical industry, its comprehensive utilization increasingly attracts the attention of people. In the article, CaTiO3was studied as one of the main mineral of the titanium-bearing blast furnace slag, The Characteristics that CaTiO3can absorb methylene blue under the dark reaction conditions was discussed the doped metal ions and the high magnetic field treatment on the photocatalytic properties of CaTiO3was stuied using XRD, SEM, FT-IR, UV-Vis and other means of detection, This will play an important role in studying the photocatalytic properties of titania-bearing blast furnace slag.With CaCO3and TiO2as raw materials, CaTiO3was synthesized by solid-phase synthetic method, In the experiment of CaTiO3absorbing methylene blue, The results show that Dosage of CaTiO3had little effect on adsorption of methylene blue on CaTiO3, and adsorption rates was about10%. the methylene blue initial concentration had a greater effect on adsorption of methylene blue on CaTiO3, with methylene blue initial concentration increasing absorption rate decreased, when initial concentration of methylene blue was10mg·l-1, degradation rate was13%3hours later; and adsorption equilibrium time was about0.5h. Effect of dosage of CaTiO3, illumination time, and initial concentration of methylene blue on the activity of photocatalytic degradation of methylene blue on CaTiO3under UV-visible light was systematicly studied. The results show that the best dosage of CaTiO3was0.25g; The longer of illumination time, the higher of the degradation rate,but reaction rate become slow; when methylene blue concentration was less, photocatalytic degradation rate of CaTiO3on methylene blue was higher,The effect of calcination temperature and doping content on the activity of photocatalytic degradation of methylene blue on CaTiO3was studied systematically, The results show that As the metal ion doping and calcination temperature were different leading to changing of photocatalyst chemical composition or light absorption ability, the metal ion entered the CaTiO3lattice, and new mineral generated, which changed the ability of photocatalytic degradation of catalysts, when CaTiO3doped by1%Cr3+calcined at600℃after2h, degradation rate of methylene blue was96.25%after90min. when CaTiO3doped by%1Y3+calcined at600℃after2h, degradation rate of methylene blue was96.6%after90min. when CaTiO3doped by%1Co3+calcined at600℃after2h, degradation rate of methylene blue was93.25%fter90min. The effect of high magnetic field treatment on the activity of photocatalytic degradation of methylene blue on CaTiO3was stuied after finding the best in the calcination temperature and doping content, The results show that CaTiO3doped by0.5%Fe3+calcined under6T magnetic field at600℃was best, degradation rate of methylene blue was100%; and CaTiO3doped by1%Cr3+calcined under4T magnetic field at600℃was best,degradation rate of methylene blue was96.6%; however CaTiO3doped by0.1%Y3+calcined under4T magnetic field at600℃was best,the maximum degradation rate of methylene blue was100%, This is due to under strong magnetic fields the magnetized CaTiO3can keep more free radicals generate by photocatalytic system in the triplet state and extend the life of free radicals effectively, Free hydroxyl radicals of strong oxidation is reason that making methylene blue which adsorped to the surface of the catalyst degradate, and ultimately mineralization and improved the photocatalytic degradation rate.