Abstract
The La2O3/Fe2O3-CeO2 composite oxide catalysts were prepared by coprecipitation method, sol-gel method and hydrothermal method. The effect of preparation methods on structure morphology and photocatalytic properties of La2O3/Fe2O3-CeO2 samples was investigated. The results show that the cubic CeO2 structure can be obtained at 600℃. The rod-shaped sample prepared by coprecipitation method, displays the highest crystalline and the strongest diffraction peak intensity. The spherical sample is acquired from sol-gel method, while the small granular sample prepared by hydrothermal method tends to aggregate. The maximum specific surface area of the sample prepared by coprecipitation method is 76.21 m2/g, the minimum specific area of the sample from sol-gel method is 32.66 m2/g and the maximum pore size is 13.84 nm, while the minimum pore volume and pore size of the sample by hydrothermal method are 0.038 cm3/g and 3.95 nm respectively. The band gap energy of catalyst samples is in the following order: sample-CP < sample-SG < sample-HT. The sample obtained by coprecipitation method has the best catalytic degradation performance for methylene blue. Under the excitation of visible light, the degradation rate was 99.58% at 50 minutes, which was higher than those of sol-gel method and hydrothermal method by 5.58% and 9.54% respectively. The catalytic degradation reaction is a first-order kinetic model: ln (c0/ct) = kt + qe. The maximum k-value of the sample degradation process obtained by coprecipitation method is 0.074 min-1.
Highlights
IntroductionThere is about 2.37 billion ton textile wastewater discharged from Chinese textile. Y
The La2O3/Fe2O3-CeO2 composite oxide catalysts were prepared by coprecipitation method, sol-gel method and hydrothermal method
The crystalline phases of the as-prepared CeO2 composite oxides were studied by x-ray diffraction (XRD) with a Bruker/AXS D8 Advance X-ray diffractometer operated at 40 kV and 200 mA with Cu Ka radiation (λ = 0.15418 nm)
Summary
There is about 2.37 billion ton textile wastewater discharged from Chinese textile. Y. Ce-based composite oxide catalysts were prepared with transition metals of Fe3+ and La3+ doped into CeO2, and their performances were investigated. The La2O3/Fe2O3-CeO2 catalysts with different morphologies were prepared by coprecipitation method, sol-gel method and hydrothermal method. Coprecipitation method: First, 0.868 g Ce(NO3)3·6H2O, corresponding Stoichiometric ratio Fe(NO3)3·9H2O and La(NO3)3·6H2O were dissolved in deionized water, the solution was added into 250 ml three-port bottle. Sol-gel method: First, 0.868 g Ce(NO3)3·6H2O, corresponding Stoichiometric ratio Fe(NO3)3·9H2O and La(NO3)3·6H2O were dissolved in deionized water to obtain mixed solution, the mixed solution was added into 250 ml three-port bottle. The La2O3/Fe2O3-CeO2 precursor samples were obtained after the precipitate being dried, followed by drying in oven at 80 C for 10 h calcinating in a muffle furnace at 600 ̊C for 4 h. The molar ratio of La3+:Fe3+ was 1:2, and the molar doping amount of La2O3 and Fe2O3 in La2O3/Fe2O3-CeO2 was 3% in the experiment
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