La<sub>2</sub>O<sub>3</sub>/Fe<sub>2</sub>O<sub>3</sub>-CeO<sub>2</sub>Composite Oxide Catalyst and Its Performance

• 作者: Guangwei Wang Jinliang Lin Youfeng Li
• 来源期刊: 材料物理与化学进展(英文)
• 学科: 化学
• 关键词: La2O3/Fe2O3-CeO2 Composite Oxide Synthetic Method CATALYTIC Degradation WASTEWATER Treatment
• 年，卷（期）: clwlyhxjzyw_2019,（12）
• 页码范围: 219-233
• 页数: 15页
• 分类号: O64

摘要

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.