Chlorpyrifos degradation via photoreactive TiO2 nanoparticles: Assessing the impact of a multi-component degradation scenario
| Autor: | Mark R. Wiesner, Courtney M. Gardner, Emina Hodzic, Jeffrey Farner Budarz, Claudia K. Gunsch, P. Lee Ferguson, Ellen M. Cooper |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
021110 strategic
defence & security studies Environmental Engineering Environmental remediation Health Toxicology and Mutagenesis 0211 other engineering and technologies Nanoparticle 02 engineering and technology 010501 environmental sciences Pesticide 01 natural sciences Pollution chemistry.chemical_compound chemistry Environmental chemistry Chlorpyrifos Titanium dioxide Photocatalysis Environmental Chemistry Degradation (geology) Photodegradation Waste Management and Disposal 0105 earth and related environmental sciences |
| Zdroj: | Journal of Hazardous Materials. 372:61-68 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2017.12.028 |
| Popis: | High concentrations of pesticides enter surface waters following agricultural application, raising environmental and human health concerns. The use of photoreactive nanoparticles has shown promise for contaminant degradation and surface water remediation. However, it remains uncertain how the complexity of natural waters will impact the photodegradation process. Here, we investigate the photoreactivity of titanium dioxide nanoparticles, the capability to degrade the pesticide chlorpyrifos, and the effect of and impact on bacteria during the photodegradation process. Loss of chlorpyrifos in solution resulted solely from photocatalytic oxidation, with 80% degradation observed after 24 h in our reactor, either in the presence or absence of bacteria. Degradation of chlorpyrifos to chlorpyrifos oxon and 3,5,6-trichloro-2-pyridinol was observed via LC/MS-MS and effectively modeled for the given reactor conditions. Bacterial inactivation occurred over 60 min and was not impacted by the presence of chlorpyrifos. The relative affinity of bacteria and chlorpyrifos for the nanoparticle surface decreased the amount of Reactive Oxygen Species (ROS) detected in the bulk by up to 94%, suggesting that ROS measurements in simplified systems may overestimate the reactivity of photoreactive nanoparticles in complex environments. |
| Databáze: | OpenAIRE |
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