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| 1 | Cerium dioxide as a new reactive sorbent for fast degradation of parathion methyl and some other organophosphates显示文摘Cerium dioxide was used for the first time as reactive sorbent for the degradation of the organophosphate pesticides 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).CeO2 specimens were prepared by calcination of basic cerous carbonate obtained by precipitation from an aqueous solution.The CeO2 samples containing certain amounts(1 wt.%–5 wt.%) of the neighboring lanthanides(La,Pr,Nd) were prepared in a similar way from pure lanthanide salts.It was shown that ceria accelerated markedly the decomposition of parathion methyl causing the cleavage of the P-O-aryl bond in the pesticide molecule.A similar reaction mechanism was proposed for the degradation of other organophosphate pesticides and nerve agents.The degradation times(reaction half-times) were in an order of minutes in the presence of CeO2,compared to hours or days under common environmental conditions.The reaction in suitable organic solvents allowed conversions of about 90% for parathion methyl loading of 20 mg pesticide/g CeO2 within 2 h with a reactant half-life in the order of 0.1 min.The key parameter governing the degradation efficiency of CeO2 was the temperature during calcination.At optimum calcination temperature(about 773.15 K),the produced ceria retained a sufficiently high surface area,and attained an optimum degree of crystallinity(related to a number of crystal defects,and thus potential reactive sites).The presence of other lanthanides somewhat decreased the reaction rate,but this effect was not detrimental and permitted the possible use of chemically impure ceria as a reactive sorbent.A fast organophosphate degradation was demonstrated not only in non-polar solvents(such as heptane),but also in polar aprotic solvents(acetonitrile,acetone) that are miscible with water.This opens new possibilities for designing more versatile decontamination strategies.The cleavage of phosphate ester bonds is of a great importance not only for the degradation of dangerous chemicals(chemical weapons,pesticides),but also for interactions of ceria(especially the nano-sized one) in biologically relevant systems. | Pavel Janos Pavel Kuran Martin Kormunda Vaclav Stengl Tomas Matys Grygar Marek Dosek Martin Stastny Jakub Ederer Vera Pilarova Lubos Vrtoch | 2014 | Journal of Rare Earths2014，32，4： | 4 |
| 2 | High-voltage planar junctions investigated by the OBIC method 显示文摘 | Stengl R | 1987 | IEEE Transactions on Electron Devices1987，34，4： | 2 |
| 3 | Photoaetivity of anatase-rutile TiO2 nanocrystalline mixtures obtained by heat treatment of homogeneouslyprecipitated anatase 显示文摘 | Bakardjieva S Subrt J Stengl V | 2005 | Appl Catal B : Environmental2005，58，34： | 1 |
| 4 | Titania aerogel prepared by low temperature super- critical drying显示文摘 | STENGL V BAKARDJIEVA J SUBRTT L | 2009 | Microporous and Mesoporous Ma- terials2009，91，123： | 1 |
| 5 | The phase II urokinase-streptokinase pulmonary embolism trial: a national cooperative study显示文摘 | Sasahra A A Bell W R Simon T L Stengle J M Sherry S | 1975 | Thromb Diath Haemorrh1975，33，： | 1 |
| 6 | A model for the silicon wafer bonding process显示文摘 | STENGL R TAN T GOSELE U | 1989 | Japanese Journal of Applied Physics1989，28，10： | 1 |
| 7 | 显示文摘 | Stengl Vvf'opelkova D vu n P | 2011 | J Phys Chem C2011，115，51： | 1 |
| 8 | Zinc oxide prepared by homogeneous hydrolysis with thioacetamide, its destruction of warfare agents, and photocatalytic activity显示文摘 | Houskova V Stengl V Bakardjieva S | 2007 | J Phys Chem A2007，111，20： | 1 |
| 9 | Reduced L-type Calcium current in ventricular myocytes from pigs with hyperdynamic septic shock显示文摘 | Stengl M Bartak F Sykora R | 2010 | Crit Care Med2010，38，2： | 1 |
| 10 | Preparation and photoca-talytic activity of rare earth doped TiO2 nanoparticles 显示文摘 | STENGL V BAKARDJIEVA S MURAFA N | 2009 | Materials Chemistry and Physics2009，114，： | 1 |
| 11 | Ge4 + doped TiO2 forstoichiometric degradation of warfare agents显示文摘 | Stengl V Grygar TM Oplustil F | 2012 | J Hazard Mater2012，，： | 1 |
| 12 | Causes and prevention of temperature-dependent bubbles in silicon wafer bonding 显示文摘 | K MITANI LEHMANN V STENGL R | 1991 | Jpn J of Appl Phys1991，30，4： | 1 |
| 13 | Treatment of pulmonary embolism with urokinase:Results of clinical trial(phase 1)显示文摘 | HYERS T M STENGLE J M SHERRY S | 1970 | Circulation1970，42，6： | 1 |
| 14 | Photoactivity of anatase-rutile TiO2 nanocrystalline mixtures obtained by heat treatment of homogeneously precipitated anatase显示文摘 | BAKARDJIEVA S SUBRT J STENGL V DIANEZ M J SAYAGUES M J | 2005 | Appl Catal:B2005，，58： | 1 |
| 15 | Titania aerogel prepared by low temperature supercritical drying显示文摘 | Stengl V Bakardjieva S Subrt J | | 0，，1： | 1 |
| 16 | Prepara tion and photoeatalytic activity of rare earth doped TiO2 nanop articles显示文摘 | Stengl Vaclav Bakardjieva Snejana Murafa Nataliya | 2009 | Materials Chemistry and Physics2009，114，1： | 1 |
| 17 | On the morphology and the electrochemical formation mechanism of mesoporous silicon显示文摘 | Lehmanne V Stengl R Luigart A | 2000 | Materials Science and Engineering B2000，6970，： | 1 |
| 18 | Photoactivity of anatase-rutile TiO2 nanocrystalline mixtures obtained by heat treatment of homogeneously precipitated anatase显示文摘 | Bakardjieva S Subrt J Stengl V | 2005 | Applied Catalysis B: Environmental2005，58，： | 1 |
| 19 | Probing the contribution of IKs to canine ventricular repolarization:Key role for beta-adrenergic receptor stimulation显示文摘 | Volders PG Stengl M van Opstal JM | 2003 | Circulation2003，107，21： | 1 |
| 20 | Extracellular divalent cations block a cation non-selective conductance unrelated to calcitan channels in rat cardiac muscle显示文摘 | Mubagwa K Stengl M Flameng W | 1997 | J Physiol1997，502，2： | 1 |
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