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오세진,이재영,권순주,유장용,주웅용,Oh, Sei-Jin,Lee, Jae-Yong,Kwon, Soon-Ju,Yoo, Jang-Yong,Choo, Wung-Yong 한국재료학회 2002 한국재료학회지 Vol.12 No.10
Effect of nine different cations to the formation of iron oxyhydroxide was studied using Mossbauer spectroscopy, XRD and BET. The Redox Potential and pH were measured for the determination of the internal reaction rate, as well. The phases of iron oxyhydroxide could not be the same with each other, due to the present of different cations in solution. Although the oxyhydroxide compound were composed of the same phases, the fraction of each phase was different from each other. The internal reaction rate was varied by the substitution of cation. It could be a cause of the different phase and particle size of oxyhydroxide compound.
Vaporization and Diffusion Studies on the Stability of Doped Lanthanum Gallates
Stanislowski, M.,Peck, D.-H.,Woo, S.-K.,Singheiser, L.,Hilpert, K.,Schulz, O.,Martin, M. WILEY-VCH 2006 FUEL CELLS -WEINHEIM- Vol.6 No.3
<P>Vaporization and diffusion determine the stability of doped lanthanum gallates under SOFC operating conditions. Systematic vaporization studies of Ga and other elements were carried out using the vapor transpiration method. It was shown that the Ga vaporization is controlled by diffusion from the bulk to the surface. Diffusion coefficients D<SUB>Ga</SUB> and vaporization coefficients &agr;<SUB>Ga</SUB> were determined by fitting the measured vaporization data to a vaporization model. Secondary phases formed as a result of the vaporization were detected. The influence of different doping levels of Sr, Mg and Fe on the Ga vaporization was elucidated. Moreover, cation self-diffusion of <SUP>139</SUP>La, <SUP>84</SUP>Sr and <SUP>25</SUP>Mg as well as cation impurity diffusion of <SUP>144</SUP>Nd, <SUP>89</SUP>Y and <SUP>56</SUP>Fe in polycrystalline samples of doped lanthanum gallate were directly determined for the composition La<SUB>0.9</SUB>Sr<SUB>0.1</SUB>Ga<SUB>0.9</SUB>Mg<SUB>0.1</SUB>O<SUB>2.9</SUB> as an example, from diffusion profiles determined by SIMS. It was found that diffusion occurs by means of bulk and grain boundaries. The bulk diffusion coefficients are similar for all cations with activation energies which are strongly dependent on temperature. The results are explained by a frozen-in defect structure at low temperatures in the ABO<SUB>3</SUB> perovskite lattice and by proposing a defect cluster containing cation vacancies in the A and B sublattices, as well as oxygen vacancies.</P>
M.D. Vı´ctor-Ortega,J.M. Ochando-Pulido,A. Martı´nez-Ferez 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
The performance of a fixed-bed cation exchange process was examined for final purification of the ironload derived from catalyst usage in the secondary treatment of olive mill wastewater, which led tounacceptable iron levels. Results showed an increase in the pH value up to 4 enhanced the iron ionexchange (IE) efficiency, which decreased upon higher pH. Furthermore, Thomas model provided utmostaccurate dynamic behavior modeling for all inlet concentrations studied (20, 50 and 100 mg L 1). Additionally, up to 100% recovery efficiencies were maintained even after 10 complete cycles. Finally, aneffluent with quality for irrigation reuse was obtained.
Qianqian Shi,Aimin Li,Qing Zhou,Chendong Shuang,Yan Li,Yan Ma 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Carbon/iron composites were prepared from waste cation exchange resin by NaOH activation. The BETsurface areas were over 1200 m2 g-1. The presence of iron led to the formation of new mesopores andmacropores. Activation temperature had a significant impact on the pore size distributions, crystalstructures, and magnetic properties of the carbon composites, and the magnetic properties of thecomposites were related to their crystal structures. The composite synthesized at 800 8C (800ACS-1)could effectively remove diethyl phthalate, bisphenol A, and malachite green from aqueous solutions. 800ACS-1 also exhibited high stability over a wide pH range of 4–11.5.
Highly Selective Colorimetric Signaling of Iron Cations Based on Fluoran Dye
Wang, Sheng,Gwon, Seon-Yeong,Son, Yong-A,Matsumoto, Shinya,Hwang, In Jeong,Kim, Sung-Hoon TaylorFrancis 2009 MOLECULAR CRYSTALS AND LIQUID CRYSTALS - Vol.504 No.1
<P> A highly selective colorimetric chemosensor based on fluoran dye for iron cations, 2'-anilino-3'methyl-6'-dibuthylamino-N-(2'-(2''-hydroxybenzylideneamino)ethyl) iso-indolin-1-one-fluoran (5), was designed and synthesized. The chemical structures of all the intermediates and fluoran dye 5 were characterized by 1H-NMR, 13C-NMR, MS and elemental analysis. And its sensing behavior toward metal ions was investigated by UV-visible absorption spectroscopes. The fluoran dye 5 chemosensor showed an extreme selectivity for Fe2+ and Fe3+ in acetonitrile solution. Whereas other ions including Mg2+, Pd2+, Ni2+, Hg2+, Cd2+, Ag+, Cu2+, Zn2+ and Al3+ induced basically no spectral change, which constituted a Fe2+ highly sensitive and selective colorimetric chemosensor from colorless to black by “naked eyes.” Spectral responses at &lgr;max = 653 nm reveals that dye 5 can function as OR logic gate with Fe2+ and Fe3+ as input variables.</P>
Reaction kinetics of reduction and oxidation of metal oxides for hydrogen production
Go, Kang Seok,Son, Sung Real,Kim, Sang Done Elsevier 2008 International journal of hydrogen energy Vol.33 No.21
<P><B>Abstract</B></P><P>Partial oxidation of methane and water splitting for hydrogen production were carried out. The reaction kinetics of reduction and oxidation (redox) of Mn and Zn iron oxides were determined using a thermogravimetric analyzer. The reduction conversion of the metal oxides increases with temperature above 1073K and all the experimental data are well represented by the diffusion-limited mechanism except ZnFe<SUB>2</SUB>O<SUB>4</SUB> due to the solid state diffusion of iron and the reaction with solid carbon. The oxidation reaction was also controlled by the product-layer diffusion mechanism. Substitution of Mn and Zn cations with iron oxides can lower the reaction temperature and increase the reaction rate. The reaction rate and the activation energy (57–110kJ/mol) for decomposition of water by oxidation of the metal oxides were also determined.</P>