Next Article in Journal
A Cost-Effectiveness Analysis of India’s 2008 Prohibition of Smoking in Public Places in Gujarat
Next Article in Special Issue
Release of Nitrogen and Phosphorus from Poultry Litter Amended with Acidified Biochar
Previous Article in Journal
Population Surveillance of Dementia Mortality
Previous Article in Special Issue
Arsenic in Surface Soils Affected by Mining and Metallurgical Processing in K. Mitrovica Region, Kosovo
Int. J. Environ. Res. Public Health 2011, 8(4), 1258-1270; doi:10.3390/ijerph8041258

Degradation of Glyphosate in Soil Photocatalyzed by Fe3O4/SiO2/TiO2 under Solar Light

1,* , 1
1 Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China 2 Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
* Author to whom correspondence should be addressed.
Received: 20 February 2011 / Revised: 1 April 2011 / Accepted: 1 April 2011 / Published: 21 April 2011
(This article belongs to the Special Issue Soil Pollution: Prevention and Mitigation)
View Full-Text   |   Download PDF [594 KB, 19 June 2014; original version 19 June 2014]   |  


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.
Keywords: photocatalytic; solar light; titanium dioxide; glyphosate photocatalytic; solar light; titanium dioxide; glyphosate
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote |
MDPI and ACS Style

Xu, X.; Ji, F.; Fan, Z.; He, L. Degradation of Glyphosate in Soil Photocatalyzed by Fe3O4/SiO2/TiO2 under Solar Light. Int. J. Environ. Res. Public Health 2011, 8, 1258-1270.

View more citation formats

Related Articles

Article Metrics

For more information on the journal, click here


[Return to top]
Int. J. Environ. Res. Public Health EISSN 1660-4601 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert