Study of Degradation Kinetics of Parathion Methyl On Mixed Nanocrystalline Titania-Zirconium and Titania-Cerium Oxides

World Multidisciplinary Earth Sciences Symposium 2016

Kurá, Pavel^1 ; Penika, Martin^1 ; Št'Astný, Martin^1 ; Benkocká, Monika^2 ; Jano, Pavel^1

Faculty of Environment, University of Jan Evangelista Purkyne, KralovaVysina 7, Usti nad Labem

400 96, Czech Republic^1

Faculty of Science, University of Jan Evangelista Purkyne, Ceske Mladeze 8, Usti nad Labem

400 96, Czech Republic^2

关键词: Chemical warfare agents;    Degradation kinetics;    Degradation products;    Diode array detectors;    Nanocrystalline metal;    Nanocrystalline titania;    Organophosphate pesticides;    Weber-Morris equations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/44/5/052039/pdf
DOI  :  10.1088/1755-1315/44/5/052039

来源: IOP

【 摘 要 】

The unique surface properties of some nanocrystalline metal oxides and their application for removal of various toxic compounds were reported in early 1990s. Recently, a reliable method for the preparation of reactive cerium dioxide sorbent and its application for degradation of the organophosphate pesticides, such as parathion methyl, chlorpyrifos, dichlofenthion, fenchlorphos, and prothiofos, as well as of some chemical warfare agents-nerve gases soman and O-ethyl S-[2-(diisopropylamino) ethyl] methylphosphonothioate (VX) was published. This paper reports on the kinetics study of degradation of parathion methyl as a representative organophosphate on nanocrystalline metal oxides TiO2, ZrO2, CeO2and their mixtures in different molar ratios of particular elements. The tested sorbents except of CeO2were prepared by different methods (e.g. sol-gel, precipitation) in cooperation with Institute of Inorganic Chemistry (Rez, Czech Republic). The degradation kinetics of parathion methyl on tested sorbents was followed by HPLC equipped with diode array detector. The basic kinetics parameters (half-lives of parathion methyl degradation, rate constants of degradation product formation) were calculated for each sorbent from Weber-Morris equation of 1st order diffusion kinetic model. The results proved the ability of prepared sorbents to degrade parathion methyl under formation of 4-nitrophenol as the main degradation product. The most efficient sorbents were TiCe (2:8), TiCe (1:1), TiCe (0:1) (50-70 %) followed by TiZr (1:1), TiCe (8:2), TiZr (8:2), TiZr (2:8) (20-30%) and TiO2, ZrO2(less than 5 %).