Reaction mechanism of N-benzoyl-N-phenylhydroxylamine with vanadium(IV) in the weakly acidic medium

Zhou, Nan

doi:10.1016/s0039-9140(00)00404-5

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…33 From our results and in agreement with the findings of Downard, 34 this hypothesis is unlikely as the peak intensity remains identical from the beginning to the end of the measurements. The N1A peak at 401.2 eV corresponds to that of hydroxylamine as observed in the Nbenzoyl-N-phenylhydroxylamine/vanadium(IV) system, 35 or to that of NH 3 + species. 36 During the reduction of nitrophenyl layers by various means, Downard 34 assigned an XPS peak at $402 eV to hydroxylamine/nitroso and protonated amino groups.…”

Section: Results 1 Physical Characterization Of Molecular Modificationsmentioning

confidence: 97%

Lowering interfacial chemical reactivity of oxide materials for lithium batteries. A molecular grafting approach

et al. 2009

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International audienceThis paper proposes a molecular grafting approach as a way to modify the interfacial chemical reactivity of oxide materials, which is detrimental to their long-term energy storage properties. The present study demonstrates that diazonium chemistry offers an efficient path to graft molecules at the surface of a powder oxide material. Indeed, surface derivatization of Li1.1V3O8 nanograins was accomplished by in situ electrografting of a diazonium salt during Li-ion intercalation. The results show that aryl molecules are strongly bonded to the surface forming an organic multilayer the thickness of which can be modulated. Based on TEM, XPS and electrochemical probing of the surface reactivity, the results demonstrate the interest of the proposed surface modifications as a way to tailor both electrochemical and chemical reactivities of oxide electrode materials. Interestingly, charge transfer at the surface of the material is not impeded, while electrolyte decomposition is inhibited. It is anticipated that molecular derivatization of electrode surfaces is a new research direction which will be developed in the field of battery science in the near future, in order to prevent targeted side reactions occurring at different steps of battery manufacturing and use, such as storage, electrode processing, simple contact with electrolyte, and cycling

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Section: Results 1 Physical Characterization Of Molecular Modificationsmentioning

confidence: 97%

Lowering interfacial chemical reactivity of oxide materials for lithium batteries. A molecular grafting approach

et al. 2009

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“…Some solid phase adsorbents including chelating resin [7,21,24], multiwalled carbon nanotubes [8], ion-exchange resin [10], biosorbent material [11], functionalized cellulose adsorbent [18], and TTA modified-microcrystalline naphthalene [19] have been employed for the speciation of vanadium. However, due to the easy oxidation of V(IV) to V(V) by atmospheric oxygen at low acidity and similar chemical properties of the two oxidation states, it is difficult to directly separate V(IV) from V(V) in real samples by using a chelating reagent modified adsorbent [26]. In order to overcome this problem, 1,2-cyclohexanediaminetetraacetic acid (CDTA) was usually used as a masking agent for V(IV) [4,22], but the operation is laborious and it is associated with the possible contamination risk.…”

Section: Introductionmentioning

confidence: 99%

On-line separation/preconcentration of V(IV)/V(V) in environmental water samples with CTAB-modified alkyl silica microcolumn and their determination by inductively coupled plasma-optical emission spectrometry

Xiong

2010

Journal of Hazardous Materials

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“…5,13 Recently the uptake of metal ions onto polyether-type polyurethane foam has been studied in our laboratory. 14,15 N-Benzoyl-N-Phenylhydroxylamine (BPHA), previously used as an extractant for metal ions in solvent extraction and metal determination, [16][17][18][19][20][21][22][23] was immobilized on poly urethane foam, and adsorption of Zn(II) ions onto its surface was studied. The results are presented in this paper.…”

Section: Introductionmentioning

confidence: 99%

Removal of Zn(II) Ions from Aqueous Solution Using BPHA‐Impregnated Polyurethane Foam

Ahmad

Ahmed

2008

J Chinese Chemical Soc

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Zn(II) ions sorption onto N‐Benzoyl‐N‐Phenylhydroxylamine (BPHA) impregnated polyurethane foam (PUF) has been studied extensively using radiotracer and batch techniques. Maximum sorption (∼98%) of Zn(II) ions (8.9 × 10−6 M) onto sorbent surface is achieved from a buffer of pH 8 solution in 30 minutes using 7.5 mg/mL of BPHA‐impregnated polyurethane foam at 283 K. The sorption data follow Langmuir, Freundlich and Dubinin‐Radushkevich (D‐R) isotherms. The Langmuir constants Q = 18.01 ± 0.38 μ mole g−1 and b = (5.39 ± 0.98) × 103 L mole−1 have been computed. Freundlich constants 1/n = 0.29 ± 0.01 and Cm = 111.22 ± 12.3 μ mole g−1 have been estimated. Sorption capacity 31.42 ± 1.62 μ mole g−1, β = −0.00269 ± 0.00012 kJ2 mole−2 and energy 13.34 ± 0.03 kJ mole−1 have been evaluated using D‐R isotherm. The variation of sorption with temperature yields ΔH = −77.7 ± 2.8 k J mole−1, ΔS = −237.7 ± 9.3 J mole−1 K−1 and ΔG = −661.8 ± 117.5 k J mol−1 at 298 K reflecting the exothermic and spontaneous nature of sorption. Cations like Fe(III), Ce(III), Al(III), Pb(II) and Hg(II) and anions, i.e., oxalate, EDTA and tartrate, reduce the sorption significantly, while iodide and thiocyanate enhanced the sorption of Zn(II) ions onto BPHA‐impregnated polyurethane foam.

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Reaction mechanism of N-benzoyl-N-phenylhydroxylamine with vanadium(IV) in the weakly acidic medium

Cited by 6 publications

References 9 publications

Lowering interfacial chemical reactivity of oxide materials for lithium batteries. A molecular grafting approach

Lowering interfacial chemical reactivity of oxide materials for lithium batteries. A molecular grafting approach

On-line separation/preconcentration of V(IV)/V(V) in environmental water samples with CTAB-modified alkyl silica microcolumn and their determination by inductively coupled plasma-optical emission spectrometry

Removal of Zn(II) Ions from Aqueous Solution Using BPHA‐Impregnated Polyurethane Foam

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