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Abstract
The widespread use of fluazifop-p-butyl (FPB) contributes to its presence in the environment. Considering the ecological risks of FPB residues in the environment, the anatase nanometer titanium dioxide (nano-TiO2) mediated photocatalytic degradation of FPB was studied by smearing FPB and nano-TiO2 together on a glass plane; illumination, trimethylsilane derivatization of photolysis products, high performance liquid chromatography (HPLC) quantitative analysis and gas chromatograph-mass spectrometer (GC-MS) identification were used. Results showed that the first order dynamic model could describe the photodegradation of FPB by nano-TiO2 mediated, and the photodegradation and photosensitization rates were found to be positively correlated with the dose of nano-TiO2 at lower dose ranges. It is noticeable that a strong photosensitization effect was exhibited on degradation of FPB, not only under high-pressure mercury lamps, but also simulated sunlight (xenon lamp light). Ultimately, twelve main photolytic products were reasonably speculated, whilst five photolysis pathways were proposed. These results together suggest that nano-TiO2 can be used as an effective photosensitizer to accelerate FPB photolysis.
Highlights
The use of chemical pesticides in modern agriculture is vital to guarantee crop yield and quality and, as such, it will continue to be widely applied
The intense use of pesticides will inevitably lead to environmental contamination and constitute threats to human health
FPB (Fluazifop-p-butyl) is a highly selective systemic, post-emergence aryloxyphenoxypropionate (AOPP) herbicide that is registered for use in selectively controlling both annual and perennial grassy weeds for many crops, but does little or no harm to non-graminaceous crops [1]
Summary
The use of chemical pesticides in modern agriculture is vital to guarantee crop yield and quality and, as such, it will continue to be widely applied. The intense use of pesticides will inevitably lead to environmental contamination and constitute threats to human health. Based on their toxic nature, there is considerable concern regarding their environmental risks. FPB (Fluazifop-p-butyl) is a highly selective systemic, post-emergence aryloxyphenoxypropionate (AOPP) herbicide that is registered for use in selectively controlling both annual and perennial grassy weeds for many crops, but does little or no harm to non-graminaceous crops [1]. The accumulation of these herbicides may potentially destroy fish populations or elevate the concentration of undesirable toxicants in natural water systems and jeopardize the health of humans
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