Decomposition of Adsorbed VX on Activated Carbons Studied by <sup>31</sup>P MAS NMR

Columbus, Ishay; Waysbort, Daniel; Shmueli, Liora; Nir, I.; Kaplan, Doron

doi:10.1021/es052226d

Cited by 41 publications

(63 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Modified ASC carbon (designated M-ASC) was prepared by removal of the impregnation compounds from ASC carbon with acid as previously described [7].…”

Section: Activated Carbonsmentioning

confidence: 99%

“…Recently, growing concern about safe disposal of used chemical protective equipment has motivated investigations of the fate of adsorbed chemical warfare agents (CWA) on activated carbon [1][2][3][4][5][6][7]. Adsorbed organophosphorus (OP) CWA (nerve agents) are of particular interest owing to their high acute toxicity to humans.…”

Section: Introductionmentioning

confidence: 99%

“…In a previous study [7] we have shown that the persistent nerve agent O-ethyl S-[2-(diisopropylamino)-ethyl] methylphosphonothioate (VX) on activated carbon decomposes to ethyl methylphosphonic acid (EMPA). At least 90% of the adsorbed VX decomposes within about 20 days, even when the carbon is extensively dried.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Degradation of Adsorbed Sarin on Activated Carbons: A ³¹P‐MAS‐NMR Study

Kaplan¹,

Shmueli²,

Nir³

et al. 2007

CLEAN Soil Air Water

Self Cite

View full text Add to dashboard Cite

The fate of the OP nerve agent isopropyl methylphosphonofluoridate (sarin) on granular activated and metal-impregnated activated carbons that are used in gas-mask filters was investigated by means of 31 P magic-angle-spinning (MAS) NMR spectroscopy. The results show that most of the adsorbed sarin on extensively dried carbons decomposes with a half-life of 5 -12 days. A MAS-NMR signal of the degradation product isopropyl methylphosphonic acid (IMPA) appears in the spectra of sarin on non-impregnated carbons. The IMPA signal is not visible in the spectra from metal-impregnated carbons, probably due to strong binding of the acid molecule to paramagnetic Cr 3+ and Cu 2+ ions. Exposure of BPL and ASC carbons to air of 53% relative humidity shortens the degradation time by approximately an order of magnitude. Wetting shortens the half-life of sarin on BPL carbon to approximately 2 hours.

show abstract

“…Modified ASC carbon (designated M-ASC) was prepared by removal of the impregnation compounds from ASC carbon with acid as previously described [7].…”

Section: Activated Carbonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Degradation of Adsorbed Sarin on Activated Carbons: A ³¹P‐MAS‐NMR Study

Kaplan¹,

Shmueli²,

Nir³

et al. 2007

CLEAN Soil Air Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…P magic-angle-spinning (MAS) NMR spectra [41] were obtained at 202 MHz with a 500 MHz Bruker Avance spectrometer, fitted with a 4 mm standard CP-MAS probe, by direct excitation (no CP). Samples were packed in a 4 mm ZrO 2 rotor sealed with a Kel-F cap.…”

mentioning

confidence: 99%

Synthesis, Characterisation and Cytotoxicity of Polyoxometalate/Carboxymethyl Chitosan Nanocomposites

Geisberger

Paulus

Carraro

et al. 2011

Chemistry A European J

View full text Add to dashboard Cite

Chitosan and its derivates continue to attract considerable research interest as effective drug carriers with good biocompatibility and high cellular uptake rates. We used these versatile features to tap the considerable biomedical potential of polyoxometalates (POMs) through their encapsulation into a carboxymethyl chitosan (CMC) matrix. The nanocapsules were prepared by ionic gelification with Ca(2+); their size distribution ranges from 60 to 150 nm. Because [Co(4)(H(2)O)(2)(PW(9)O(34))(2)](10-) is well known for its manifold properties, such as antiviral activity, it was selected as a model POM. The resulting composites were characterised with a wide range of analytical methods, which pointed to quantitative encapsulation of intact POMs within the CMC matrix. We studied the biocompatibility of the POM/CMC nanocomposites on HeLa cells through MTT and proliferation assays. Even after prolonged incubation times at high concentrations, the composites did not display cytotoxicity, thereby drastically reducing the side effects of the pristine POMs. This opens up new avenues for designing novel inorganic drug prototypes from bioactive POMs.

show abstract

“…Nanooxides play an important role in applied chemistry due to their vast applications such as semiconductors [1], biodiesel applications [2], catalytic application [3,4], biological applications [5], glaze applications [6], purification of oils [7] and photocatalytic degradation of organic pollutants [8][9][10][11][12]. Though many sorbents were tried for the decontamination of CWA's; viz activated carbon [13,14] or polymer [15,16], but the use of mixed metal oxide nanoparticles showed more satisfactory results [17,18] due to their high surface area, crystallinity, different morphologies and easily separation of electron hole pairs which are necessary for generating free radicals which decompose these organic pollutants [19]. Among of these oxides, very little work about the nanoscaled Magnesia-Zirconia mixed oxides (MgO-ZrO 2 ) was reported throughout literature survey.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of MgO-ZrO2 Mixed Nanoparticles via Different Precursors: Identification of their Destructive Action for Organic Pollutants

Moustafa¹,

Abdelhamid²

2018

J Chem Eng Process Technol

View full text Add to dashboard Cite

Nanocrystalline mixed Magnesium-Zirconyl oxides were prepared by co-precipitation method starting from different organic acid precursors and glycine. The as-prepared nanooxides were characterized by X-Ray Diffraction, TGA-DTA, HR-TEM, electronic absorption spectra and FTIR spectroscopic techniques. The results confirmed the formation of mixed MgO-ZrO 2 (cubic, orthorhombic) nanooxides with crystallite size ranging from 10.79-47.55 nm depending on the organic precursors used. The UV-Vis spectroscopy showed the semiconductor nature of the samples with optical energy gap ranging from 2.85-3.00 eV. The morphology and microstructure characteristics were also obtained by High Resolution Transmission Electron Microscopy (HRTEM). The products had been tested as destructive adsorbents for the decontamination of Malathion as VX Chemical Warfare Agent (CWA) stimulant, where it was found that complete decontamination took place within 240 min. The photoactivity of the prepared samples was assessed by the photocatalytic decomposition of Orange G dye in an aqueous solution under irradiation of UV radiation of 365 nm wavelength.

show abstract

Decomposition of Adsorbed VX on Activated Carbons Studied by ³¹P MAS NMR

Cited by 41 publications

References 16 publications

Degradation of Adsorbed Sarin on Activated Carbons: A ³¹P‐MAS‐NMR Study

Degradation of Adsorbed Sarin on Activated Carbons: A ³¹P‐MAS‐NMR Study

Synthesis, Characterisation and Cytotoxicity of Polyoxometalate/Carboxymethyl Chitosan Nanocomposites

Synthesis of MgO-ZrO2 Mixed Nanoparticles via Different Precursors: Identification of their Destructive Action for Organic Pollutants

Contact Info

Product

Resources

About

Decomposition of Adsorbed VX on Activated Carbons Studied by 31P MAS NMR

Cited by 41 publications

References 16 publications

Degradation of Adsorbed Sarin on Activated Carbons: A 31P‐MAS‐NMR Study

Degradation of Adsorbed Sarin on Activated Carbons: A 31P‐MAS‐NMR Study

Synthesis, Characterisation and Cytotoxicity of Polyoxometalate/Carboxymethyl Chitosan Nanocomposites

Synthesis of MgO-ZrO2 Mixed Nanoparticles via Different Precursors: Identification of their Destructive Action for Organic Pollutants

Contact Info

Product

Resources

About

Decomposition of Adsorbed VX on Activated Carbons Studied by ³¹P MAS NMR

Degradation of Adsorbed Sarin on Activated Carbons: A ³¹P‐MAS‐NMR Study

Degradation of Adsorbed Sarin on Activated Carbons: A ³¹P‐MAS‐NMR Study