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Jonathan A Olds - One of the best experts on this subject based on the ideXlab platform.

Vladimir Sergeevich Semenishchev - One of the best experts on this subject based on the ideXlab platform.

  • mechanism of strontium sorption by the mixed nickel Potassium Ferrocyanide based on hydrated titanium dioxide
    Journal of Radioanalytical and Nuclear Chemistry, 2016
    Co-Authors: Anna Vladimirovna Voronina, Vladimir Sergeevich Semenishchev
    Abstract:

    The influence of surface modification of hydrated titanium dioxide (HTD) by mixed nickel–Potassium Ferrocyanide (NPF) phase on its selectivity for strontium and mechanism of strontium sorption was studied. It was shown that NPF-HTD sorbent possesses the same selectivity for strontium as the HTD sorbent, but higher static exchange capacity (SEC). The Henry distribution coefficient of strontium from a tap water with pH 7.8 ± 0.1 was 10(3.0 ± 0.3) L kg−1; the SEC, calculated according to Langmuir’s isotherm, was 140 mg g−1. Kinetic studies have shown that strontium sorption is limited by both internal and external diffusion as well as by the rate of chemical transformation of the NPF-HTD sorbent.

  • returning land contaminated as a result of radiation accidents to farming use
    Journal of Environmental Radioactivity, 2015
    Co-Authors: A V Voronina, Vladimir Sergeevich Semenishchev, M O Blinova, Dharmendra K Gupta
    Abstract:

    Abstract An assessment is given of the possibility of sorbents based on natural aluminosilicates (glauconite and clinoptilolite) being used for remediation of radioactively contaminated land with the aim of returning it to farming use. A comparative study of selectivity and reversibility of radiocaesium and radiostrontium sorption by natural aluminosilicates as well as by modified Ferrocyanide sorbents based on these aluminosilicates was made. It was found that surface modification of aluminosilicates by Ferrocyanides increases the selectivity of synthesized sorbents to caesium by 100–1000 times, increases sorption capacity and makes caesium sorption almost irreversible, whereas, selectivity of these sorbents to strontium radionuclides remains approximately the same as for natural aluminosilicates. The caesium distribution coefficient for mixed nickel–Potassium Ferrocyanide on glauconite is 10 (5.0±0.6)  L kg −1 , the static exchange capacity (SEC) is 63 mg g −1 ; for mixed nickel–Potassium Ferrocyanide based on clinoptilolite caesium distribution coefficients in various concentration ranges are 10 (7.0±1.0) , 10 (5.7±0.4) and 10 (3.2±0.7)  L kg −1 , total SEC was 500 mg g −1 . Caesium leaching by various leaching solutions from saturated mixed nickel–Potassium Ferrocyanide based on clinoptilolite was lower than 2%; from saturated mixed nickel–Potassium Ferrocyanide based on glauconite it was 1.5–14.6%. Ferrocyanide sorbents, based on glauconite and clinoptilolite are recommended for remediation of land, contaminated by caesium as a result of the Fukushima accident in Japan. Use of these sorbents should decrease the transfer of caesium to agricultural vegetation up to a factor of 20.

  • peculiarities of sorption isotherm and sorption chemisms of caesium by mixed nickel Potassium Ferrocyanide based on hydrated titanium dioxide
    Journal of Radioanalytical and Nuclear Chemistry, 2013
    Co-Authors: Anna Vladimirovna Voronina, Vladimir Sergeevich Semenishchev, E V Nogovitsyna, N D Betenekov
    Abstract:

    Sorption isotherm of caesium from tap water by mixed nickel–Potassium Ferrocyanide based on hydrated titanium dioxide is obtained for a wide range of concentrations of caesium. It is shown that there are three types of specificity to caesium sorption sites in this sorbent. Sorption chemisms of caesium are studied, factors conditioned high sorption capacity of the sorbent are revealed. It is shown that occupation of sorption sites I and II is well approximated by Langmuir equilibrium and this process can be described within the bounds of theory of ion exchange. The expected sorption chemism of caesium by sorption sites III at high concentrations of caesium (>50 mg L−1) is precipitation of mixed nickel–caesium Ferrocyanide in pore space of the sorbent.

Toby A A Jenkins - One of the best experts on this subject based on the ideXlab platform.

R Jayavel - One of the best experts on this subject based on the ideXlab platform.

  • determination of metastable zone width induction period and interfacial energy of a ferroelectric crystal Potassium Ferrocyanide trihydrate kfct
    E-journal of Chemistry, 2010
    Co-Authors: R Kanagadurai, R Durairajan, Raman Sankar, G Sivanesan, S P Elangovan, R Jayavel
    Abstract:

    An order-disorder type Potassium Ferrocyanide trihydrate (KFCT) is a coordination compound forming lemon- yellow monoclinic ferroelectric crystals with curie temperature 251 K. KFCT crystals have been grown by temperature lowering solution growth technique. Solubility of KFCT has been determined for various temperatures. Metastable zone width, induction period and interfacial energy were determined for the aqueous solution of KFCT. Bulk crystal of Potassium Ferrocyanide trihydrate was grown with the optimized growth parameters. The grown crystal possesses good optical transmission in the entire UV-Visible region

  • growth and properties of ferroelectric Potassium Ferrocyanide trihydrate single crystals
    ChemInform, 2006
    Co-Authors: R Kanagadurai, Raman Sankar, G Sivanesan, S Srinivasan, R Jayavel
    Abstract:

    Single crystals of Potassium Ferrocyanide trihydrate, K4[Fe(CN)6·3H2O (KFCT), a ferroelectric material with Curie temperature 251K were grown in silica gel at room temperature for the first time by the solubility reduction method. Resorcinol and ethyl alcohol were used for the purpose of gel setting and supernatant liquid respectively. Optical and mechanical properties were studied for the grown crystal. The structure of the grown crystal was confirmed by X-ray diffraction analysis. Fourier Transform Infrared (FTIR) and FT Raman spectral analysis of the crystalline samples reveal that the crystalline sample consist consists of all functional groups. Thermal analysis of the crystalline sample was performed by TGA and DTA methods. The Vicker's micro hardness value was measured for KFCT crystals. The square etch pits with a hopper-like structure is an indicative of 2D nucleation mechanism. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

  • growth and properties of ferroelectric Potassium Ferrocyanide trihydrate single crystals
    Crystal Research and Technology, 2006
    Co-Authors: R Kanagadurai, Raman Sankar, G Sivanesan, S Srinivasan, R Jayavel
    Abstract:

    Single crystals of Potassium Ferrocyanide trihydrate, K4[Fe(CN)6·3H2O (KFCT), a ferroelectric material with Curie temperature 251K were grown in silica gel at room temperature for the first time by the solubility reduction method. Resorcinol and ethyl alcohol were used for the purpose of gel setting and supernatant liquid respectively. Optical and mechanical properties were studied for the grown crystal. The structure of the grown crystal was confirmed by X-ray diffraction analysis. Fourier Transform Infrared (FTIR) and FT Raman spectral analysis of the crystalline samples reveal that the crystalline sample consist consists of all functional groups. Thermal analysis of the crystalline sample was performed by TGA and DTA methods. The Vicker's micro hardness value was measured for KFCT crystals. The square etch pits with a hopper-like structure is an indicative of 2D nucleation mechanism. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Mingray Huang - One of the best experts on this subject based on the ideXlab platform.

  • electrochemical immunosensor for cholera toxin using liposomes and poly 3 4 ethylenedioxythiophene coated carbon nanotubes
    Analytical Chemistry, 2006
    Co-Authors: Subramanian Viswanathan, Mingray Huang
    Abstract:

    A sensitive method for the detection of cholera toxin (CT) using an electrochemical immunosensor with liposomic magnification followed by adsorptive square-wave stripping voltammetry is described. Potassium Ferrocyanide-encapsulated and ganglioside (GM1)-functionalized liposomes act as highly specific recognition labels for the amplified detection of cholera toxin. The sensing interface consists of monoclonal antibody against the B subunit of CT that is linked to poly(3,4-ethylenedioxythiophene) coated on Nafion-supported multiwalled carbon nanotube caste film on a glassy carbon electrode. The CT is detected by a “sandwich-type” assay on the electronic transducers, where the toxin is first bound to the anti-CT antibody and then to the GM1-functionalized liposome. The Potassium Ferrocyanide molecules are released from the bounded liposomes on the electrode by lyses with methanolic solution of Triton X-100. The released electroactive marker is measured by adsorptive square-wave stripping voltammetry. The sa...