• Title/Summary/Keyword: Fe-As-S system

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Effect of Minerals surface characteristics On Reduction Dehalogenation of chlorination solvents in water-FeS/FeS$_2$ system

  • 김성국;허재은;박세환;장현숙;박상원;홍대일
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2000.05a
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    • pp.108-111
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    • 2000
  • FeS/FeS$_2$ minerals have been known to be potentially useful reductant to the removal of common organic contaminants in groundwater and soil. This research is aimed at improving our understanding of factors affecting the pathways and rates of reductive transformation of Hexachloroethane by catalytical iron minerals in natural system. Hexachloroethane is reduced by FeS/FeS$_2$ minerals under anaerobic condition to tetrachloroethylene and trichloroethylene with pentachloroethyl radical as the intermediate products. The kinetics of reductive transformations of the Hexachloroethane have been investigated in aqueous solution containing FeS, FeS$_2$. The proposed reduction mechanism for the adsorbed nitrobenzene involves the electron donor-acceptor complex as a precursor to electron transfer. The adsorbed Hexachloroethane undergo a series of electron transfer, proton transfer and dehydration to achieve complete reduction. It can be concluded that the reductive transformation reaction takes place at surface of iron-bearing minerals and is dependent on surface area and pH. Nitrobenzene reduction kinetics is affected by reductant type, surface area, pH, the surface site density, and the surface charge. FeS/FeS$_2$-mediated reductive dechlorination may be an important transformation pathway in natural systems.

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The Study of the Dielectric and Piezoeletric Properties of 0.05Pb(AlS12/3TWS11/3T)OS13T-0.95Pb(ZrS10.52TTiS10.48T)OS13T System Modified with MnOS12T and FeS12TOS13T (MnO2, Fe2O3 첨가에 따른 0.05Pb(Al2/3W1/3)O3-0.95Pb(Zr0.52Ti0.48)O3계의 유전 및 압전 특성에 관한 연구)

  • 윤석진;오현재;정형진
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.41 no.5
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    • pp.508-516
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    • 1992
  • In this study, dielectric and piezoelectric properties of 0.05Pb(AlS12/3TWS11/3T)OS13T-0.95Pb(ZrS10.52TTiS10.48T)OS13T system ceramics were investigated with respect to the variations of MnOS12T and FeS12TOS13T additions amounts. The results obtained in this study are summarized as follows: 1. As the amounts of MnOS12T and FeS12TOS13T are increased, tetragonality(c/a) and apparent density were decreased but grain size was increased, also the limits of solubility were revealed because pores were formed at the amounts of 0.3wt% MnOS12T and 0.5wt% FeS12TOS13T. 2. AS the increasing of amounts of MnOS12T and FeS12TOS13T, the temperature of phase transition(TS1cT) was decreased, and pemeability had maximum value at the amount of 0.3wt% MnOS12T but were sharply decreasd for the increasing FeS12TOS13T amounts. 3. As the amounts of MnOS12T and FeS12TOS13T are increased, the electro-mechanical coupling factor(kS1pT) was decreased from 60% to 41%, 19% respectively, but mechanical quality factor(QS1mT) had maximum values 720 for amount of 0.3wt% MnOS12T and 320 the amount of 0.5wt% FeS12TOS13T.

Local Structure Refinement of the $BaFe_{1-x}Sn_xO_{3-y}$ System with Fe K-Edge X-Ray Absorption (XANES/EXAFS) Spectroscopy

  • 김민규;곽기섭;로권선;여철현
    • Bulletin of the Korean Chemical Society
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    • v.18 no.7
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    • pp.743-749
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    • 1997
  • Local structure refinement of the BaFe1-xSnxO3-y system (x=0.00-0.50) has been carried out with Fe K-edge x-ray absorpion spectroscopic studies. It is found out that the Fe ions are placed in two different symmetric sites such as tetrahedral and octahedral sites in the compounds by comparison with Fe K-edge x-ray absorption near edge structure (XANES) spectrum of the γ-Fe2O3 compound as a reference. Small absorption peaks of dipole-forbiden transitions appear at a pre-edge region of 7111 eV due to the existence of Fe ions in the tetrahedral and octahedral sites. The peak intensity decreases with the substitution amount of Sn ion. Three different absorption peaks of 1s→4p dipole-allowed transition appear on the energy region between 7123 and 7131 eV. The peaks correspond to 1s→4p main transition of Fe ions in tetrahedral and octahedral sites and 1s→4p transition followed by the shakedown process of ligand to metal charge transfer. The bond distances between Fe ions in the tetrahedral site and nearest neighboring oxygen atom (Fe-4O), and those in octahedral site (Fe-6O) are determined with the extended x-ray absorption fine structure (EXAFS) analysis. Two different interatomic distances increase with the substitution amount of Sn ion and also the bond lengths of Fe-4O are shorter than those of Fe-6O in all compounds.

Acid Gas Removal Characteristics for Syngas using Fe Oxidization Process (철 산화법을 이용한 합성가스내 산성가스 제거 특성)

  • Lee, Seung-Jong;Hwang, Sang-Yeon;Yoo, Young-Don;Yun, Yong-Seung
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.804-807
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    • 2007
  • The acid gas removal (AGR) system was designed and installed to remove $H_2S$ in coal syngas in the pilot-scale coal gasification system for producing chemicals like Dimethyl Ether(DME). The syngas from the coal gasification at the rate of $100{\sim120$ $Nm^3$/hr included pollutants such as fly ash. $H_2S$, COS, $NH_3$, etc. The designed temperature and pressure of the AGR system are below 50oC and 8 kg/$cm^2$. Fe-chelate was used as an absorbent. $H_2S$ was stably removed below 0.5 ppm in the AGR system when the concentration of $H_2S$ was $150{\sim}450$ ppm. The pH of Fe-chelate solution was also stably maintained between $8{\sim}9$. FeMgO absorbent was also tested to remove $H_2S$ in the lab-scale AGR system and $H_2S$ was also removed below 0.5 ppm in the initial operation.

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Characteristics of the TCE removal in FeO/Fe(II) System (FeO/Fe(II) 시스템에서 TCE의 제거 특성)

  • Sung, Dong Jun;Lee, Yun Mo;Choi, Won Ho;Park, Joo yang
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.1B
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    • pp.149-152
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    • 2008
  • The reaction between iron oxide and ferrous iron is known to be the adsorption of ferrous iron onto the oxide surfaces that produces Fe(II)-Fe(III) (hydr)oxides and ferrous oxide oxidized to ferric ion which is the reducing agent of the target compounds. In our investigations on DS/S using ferrous modified steel slag, the results did not follow the trends. FeO and Fe(II), the major component of steel slag, were used to investigate the degradation of TCE. Degradation did not take place for the first and suddenly degraded after awhile. Degradation of TCE in this system was unexpected because Fe(II)-Fe(III) (hydr)oxides could not be produced in absence of ferric oxide. In this study, the characteristics of FeO/Fe(II) system as a reducing agent were observed through the degradation of TCE, measuring byproducts of TCE and the concentration of Fe(II) and Fe(III). Adsorption of ferrous ion on FeO was observed and the generation of byproducts of TCE showed the degradation of TCE by reduction in the system is obvious. However it did not correspond with the typical reducing mechanisms. Future research on this system needs to be continued to find out whether new species are generated or any unknown mineral oxides are produced in the system that acted in the degradation of TCE.

Effect of Boron Additions on Glass Formation and Magnetic Properties of Fe-Co-Ti-Zr-B Amorphous Ribbons

  • Kim, Sumin;Han, Bo Kyeong;Choi-Yim, Haein
    • Journal of Magnetics
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    • v.21 no.2
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    • pp.164-167
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    • 2016
  • The effect of the B additions on glass formation and magnetic properties is reported for the $Fe_{(87-x-y)}Co_yTi_7Zr_6B_x$ (x = 2, 4, 6 and y = 35, 40) alloy system. The ribbon samples with the width of 2 mm for each composition were prepared by the melt spinning technique; furthermore, their phase information was obtained from X-ray diffraction. Glass formation and magnetic properties were measured using differential scanning calorimetry and vibrating sample magnetometer respectively. The $Fe_{45}Co_{40}Ti_7Zr_6B_2$ (x = 2 and y = 40) system has the nanocrystalline phase identified as ${\alpha}-Fe$, as well as the amorphous phase, whereas all other alloys are fully amorphous. It is associated with the role of B on the glass formation. The widest supercooled liquid region is obtained as 71 K at x = 4 (both y = 35 and 40). The saturation magnetization decreases with the increase of the amount of the B addition, and the highest value is 1.59 T as x = 2 and y = 35 for this alloy system.

MAGNETORESISTANCE OF NiFeCo/Cu/NiFeCo/FeMn MULTILAYERED THIN FILMS WITH LOW SATURATION FIELD

  • Bae, S.T.;Min, K.I.;Shin, K.H.;Kim, J.Y.
    • Journal of the Korean Magnetics Society
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    • v.5 no.5
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    • pp.570-574
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    • 1995
  • Magnetoresistance of NiFeCo/Cu/NiFeCo/FeMn uncoupled exchange biased sandwiches has been studied. The magnetoresistance change ratio, ${\Delta}R/R_{s}$ showed 4.1 % at a saturation field as low as 11 Oe in $Si/Ti(50\;{\AA})/NiFeCo(70\;{\AA})/Cu(23\;{\AA})/NiFeCo(70\;{\AA})/FeMn(150\;{\AA})/Cu(50\;{\AA})$ spin valve structure. In this system, the magnetoresistance was affected by interlayer material and thickness. When Ti and Cu were used as the interlayer material in this structure, maximum magnetoresistance change ratio were 0.32 % and 4.1 %, respectively. 6.1 % MR ratio was obtained in $Si/Ti(50\;{\AA})/NiFeCo(70\;{\AA})/Cu(15\;{\AA})/NiFeCo(70\;{\AA})/FeMn(150\;{\AA})/Cu(50\;{\AA})$ spin valve structure. The magnetoresistance change ratio decreased monotonically as the interlayer thickness increased. It was found that the exchange bias field exerted by FeMn layer to the adjacent NiFeCo layer was ~25 Oe, far smaller than that reported in NiFe/Cu/NiFe/FeMn spin valve structure(Dieny et. al., ~400 Oe). The relationship between the film texture and exchange anisotropy ha been examined for spin valve structures with Ti, Cu, or non-buffer layer.

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토양 중 mineral에 의한 염소계 유기화합물 분해 특성 연구

  • Choi Jeong-Yun;Sim Sang-Gyu;Lee U-Jin
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2006.04a
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    • pp.33-36
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    • 2006
  • The reductive dechlorination of chlorinated organic compounds by soil minerals in soil and groundwater were carried out in this study. FeS, green rust, and magnetite were chosen as the representative soil minerals which were capable of degrading chlorinated compound in soil system. FeS was the most effective reductant in degradation of carbon tetrachloride. The reductive degradation of CT and 1,1,1-TCA by FeS was much faster than that of 1,2-DCB and 2,4-DCP. The reactivity of FeS was effectively improved by the addition of trace metals. The addition of Co to FeS suspension enhanced the reaction rate of 1,2-DCB by a factor of 46 compared to that by FeS without Co.

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Treatment Efficiency of Complex Wastewater by Fenton's Oxidation Condition (펜톤산화에 따른 복합폐수의 처리효율연구)

  • Sung, Il-Wha
    • Journal of Environmental Health Sciences
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    • v.32 no.5 s.92
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    • pp.446-450
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    • 2006
  • In order to treat the wastewater containing organic compound, pre-treatment system connected with MSP(molecular separation process) was investigated. With the aim of selecting an optimum process of Fenton's oxidation, removal efficiency of each process in the optimum reaction condition was recommended. The $Fe/H_{2}O_{2}$(ferric sulfate to hydrogen peroxide)reagent is referred to as the Fenton's regent, which produces hydroxyl radicals by the interaction of Fe with $H_{2}O_{2}$. The powerful oxidizing ability and extreme kinetic reactively of the hydroxyl radical was well established. Increasing dosage of $Fe/H_{2}O_{2}$ increased removal efficiency as molar ratio of $Fe/H_{2}O_{2}$ between 0.2 and 2.5. Optimum dosage of molar ratio was 1. The removal efficiency for reaction condition was increased as pH decreased when the molar ratio of $Fe/H_{2}O_{2}$ was 1.7. Fenton's oxidation was most efficient in the reaction time 35 min for complex wastewater. Also, coagulation aid experiments using kaolin resulted in 3% of kaolin dosage.

Function of the Water Soluble Browning Reaction Products Isolated from Korean Red Ginseng 2. Linoleic acid, Ox-brain autoxidant and Fe$^{2+}$ ADP/NAD system (홍삼으로부터 분리한 수용성 갈변물질의 기능성 연구 2. Linoleic acid, Ox-brain autoxidant및 Fe$^{2+}$ ADP/NADP system에서 항산화 활성 중심으로)

  • 이종원;손형옥;도재호
    • Journal of Ginseng Research
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    • v.24 no.1
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    • pp.35-40
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    • 2000
  • The purpose of this study was to investigate the antioxidant activities of water soluble browning reaction products (WS-BRPs) isolated 5\ulcorneron korea red ginseng. Antioxidant activities of WS-BRPs were examined with the various systems. All three WS-BRPs (L, S-1 and S-2) were found to have an ability to linoleic acid, Ox-brain autoxidant, Fe$^{2+}$ ADP/NAD system and cumene hydroperoxide system. Especially, S-2 was had the strongest activity of theses three WS-BRPs to scavenge free radicals such as more effective than S-1, L. MDA determination showed the antioxidant effect on linoleic acid oxidation inhibition ratio of 22.5%, 31.7%, 31.9% and 33.5%, respectivity Especially; Ox-brain autoxidant was strong inhibited activity by 49.52%,62,44,97.54% by addition of various concentration. But three WS-BRPs showed weak inhibitory activity on lipid peroxidation in rat hepatic microsomes induced enzymatically and nonenzymaticallyly

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