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首页> 外文期刊>International Journal of Environmental Research and Public Health >Degradation of Glyphosate in Soil Photocatalyzed by Fe3O4/SiO2/TiO2 under Solar Light
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Degradation of Glyphosate in Soil Photocatalyzed by Fe3O4/SiO2/TiO2 under Solar Light

机译：Fe3O4 / SiO2 / TiO2光催化土壤中草甘膦的降解

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In this study, Fe3O4/SiO2/TiO2 photocatalyst was prepared via a sol-gel method, and Fe3O4 particles were used as the core of the colloid. Diffraction peaks of Fe3O4 crystals are not found by XRD characterization, indicating that Fe3O4 particles are well encapsulated by SiO2. FTIR characterization shows that diffraction peaks of Ti-O-Si chemical bonds become obvious when the Fe3O4 loading is more than 0.5%. SEM characterization indicates that agglomeration occurs in the Fe3O4/SiO2/TiO2 photocatalyst, whereas photocatalysts modified by Fe3O4/SiO2 present excellent visible light absorption performance and photocatalytic activity, especially when the Fe3O4 loading is 0.5%. Photocatalytic degradation of glyphosate in soil by these photocatalysts under solar irradiation was investigated. Results show that 0.5% Fe3O4/SiO2/TiO2 has the best photocatalytic activity. The best moisture content of soil is 30%~50%. Degradation efficiency of glyphosate reaches 89% in 2 h when the dosage of photocatalyst is 0.4 g/100 g (soil), and it increased slowly when more photocatalyst was used. Soil thickness is a very important factor for the photocatalytic rate. The thinner the soil is, the better the glyphosate degradation is. Degradation of glyphosate is not obviously affected by sunlight intensity when the intensity is below 6 mW/cm2 or above 10 mW/cm2, but it is accelerated significantly when the sunlight intensity increases from 6 mW/cm2 to 10 mW/cm2.
机译：本研究采用溶胶-凝胶法制备了Fe3O4 / SiO2 / TiO2光催化剂，并将Fe3O4颗粒用作胶体的核心。通过XRD表征未发现Fe 3 O 4晶体的衍射峰，表明Fe 3 O 4颗粒被SiO 2很好地包封。 FTIR表征表明，当Fe3O4含量大于0.5％时，Ti-O-Si化学键的衍射峰变得明显。 SEM表征表明Fe 3 O 4 / SiO 2 / TiO 2光催化剂发生团聚，而Fe 3 O 4 / SiO 2改性的光催化剂表现出优异的可见光吸收性能和光催化活性，特别是当Fe 3 O 4负载量为0.5％时。研究了这些光催化剂在太阳辐射下对土壤中草甘膦的光催化降解。结果表明0.5％的Fe3O4 / SiO2 / TiO2具有最佳的光催化活性。土壤的最佳水分含量为30％〜50％。当光催化剂的用量为0.4 g / 100 g（土壤）时，草甘膦的降解效率在2 h内达到89％，而当使用更多的光催化剂时，其降解速度缓慢增加。土壤厚度是光催化速率的一个非常重要的因素。土壤越薄，草甘膦的降解效果越好。当强度低于6 mW / cm2或高于10 mW / cm2时，草甘膦的降解不受阳光强度的影响不明显，但是当阳光强度从6 mW / cm2增加到10 mW / cm2时，草甘膦的降解会明显加速。

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