Degradation of Glyphosate in Soil Photocatalyzed by Fe 3 O 4 /SiO 2 /TiO 2 under Solar Light

Xuan Xu, Fangying Ji, Zihong Fan and Li He
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Xuan Xu: Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
Fangying Ji: Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
Zihong Fan: Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
Li He: Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China

IJERPH, 2011, vol. 8, issue 4, 1-13

Abstract: In this study, Fe 3 O 4 /SiO 2 /TiO 2 photocatalyst was prepared via a sol-gel method, and Fe 3 O 4 particles were used as the core of the colloid. Diffraction peaks of Fe 3 O 4 crystals are not found by XRD characterization, indicating that Fe 3 O 4 particles are well encapsulated by SiO 2 . FTIR characterization shows that diffraction peaks of Ti-O-Si chemical bonds become obvious when the Fe 3 O 4 loading is more than 0.5%. SEM characterization indicates that agglomeration occurs in the Fe 3 O 4 /SiO 2 /TiO 2 photocatalyst, whereas photocatalysts modified by Fe 3 O 4 /SiO 2 present excellent visible light absorption performance and photocatalytic activity, especially when the Fe 3 O 4 loading is 0.5%. Photocatalytic degradation of glyphosate in soil by these photocatalysts under solar irradiation was investigated. Results show that 0.5% Fe 3 O 4 /SiO 2 /TiO 2 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/cm 2 or above 10 mW/cm 2 , but it is accelerated significantly when the sunlight intensity increases from 6 mW/cm 2 to 10 mW/cm 2 .

Keywords: photocatalytic; solar light; titanium dioxide; glyphosate (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2011
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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