• Title, Summary, Keyword: Metal(II) sulfate

Search Result 30, Processing Time 0.038 seconds

Hydro/solvothermal synthesis, crystal structure, and thermal behaviour of piperazine-templated nickel(II) and cobalt(II) sulfates

  • Kim, Chong-Hyeak;Park, Chan-Jo;Lee, Sueg-Geun
    • Analytical Science and Technology
    • /
    • v.19 no.4
    • /
    • pp.309-315
    • /
    • 2006
  • Two piperazine-templated metal sulfate complexes, $(C_4N_2H_{12})[Ni(H_2O)_6](SO_4)_2$, I and ($C_4N_2H_{12}$) $[Co(H_2O)_6](SO_4)_2$, II, have been synthesized by hydro/solvothermal reactions and their crystal structures analyzed by single crystal X-ray diffraction methods. Complex I crystallizes in the monoclinic system, $P2_1/n$ space group, a=12.920(3), b=10.616(2), $c=13.303(2){\AA}$, ${\beta}=114.09(1)^{\circ}$, Z=4, $R_1=0.030$ for 3683 reflections; II: monoclinic $P2_1/n$, a=12.906(3), b=10.711(2), $c=13.303(2){\AA}$, ${\beta}=114.10(2)^{\circ}$, Z=4, $R_1=0.032$ for 4010 reflections. The crystal structures of the piperazine-templated metal(II) sulfates demonstrate zero-dimensional compound constituted by diprotonated piperazine cations, metal(II) cations and sulfate anions. The structures of complex I and II are substantially isostructural to that of the previously reported our piperazine-templated copper(II) sulfate complex $(C_4N_2H_{12})[Cu(H_2O)_6](SO_4)_2$. The central metal(II) atoms are coordinated by six water molecules in the octahedral geometry. The crystal structures are stabilized by three-dimensional networks of the $O_{water}-H{\cdots}O_{sulfate}$ and $N_{pip}-H{\cdots}O_{sulfate}$ hydrogen bonds between the water molecules and sulfate anions and protonated piperazine cations. Based on the results of thermal analysis, the thermal decomposition reactions of the complex I was analyzed to have three distinctive stages whereas the complex II proceed through several stages.

The Effect of Alum and Metals on Paper Aging

  • Choi, Kyoung-Hwa;Yoon, Byung-Ho;Lee, Myoung-Ku
    • Journal of Korea Technical Association of The Pulp and Paper Industry
    • /
    • v.40 no.5
    • /
    • pp.42-46
    • /
    • 2008
  • The papers in preserved books and archives experience aging which was affected by a variety of factors. Thus, the studies concerning impacts of those factors on paper aging are required. In this research, a simulation of a short-time accelerated paper aging was conducted in order to examine the effects of acid and metals (alum, copper (II) sulfate, copper (II) chloride, and iron (III) chloride) on the natural paper aging for a long time. As a result of experiments, it is found that both acid and metals have impacts on paper aging. Alum resulted in the significant decrease of pH, brightness, folding endurance, and viscosity of paper. Both copper (II) chloride and iron (III) chloride also resulted in the decrease of brightness, folding endurance, and viscosity of paper. In more detail, paper aging by iron (III) chloride showed much more significant than that by copper (II) chloride. The paper aging in case of copper (II) sulfate coexisting sulfate ion, where metal absorbed moisture was higher than in case of paper treated only by alum. This result indicated that metal catalyzes paper aging by acid. Based on these results, it was revealed that both alum and metal are the major factors in paper aging. In particular, paper aging was far more accelerated in case when acid and metals existed in paper at the same time.

Removal of heavy metal by coprecipitation with barium sulfate (황산바륨의 공침현상을 이용한 중금속 이온의 제거)

  • Lim, Heon-Sung;Lee, Sueg-Geun
    • Analytical Science and Technology
    • /
    • v.19 no.4
    • /
    • pp.280-284
    • /
    • 2006
  • The objective of this study is to investigate the removal of heavy metal by using the coprecipitation of barium sulfate. Several parameters governing the efficiency of the coprecipitation method were evaluated by the pH of sample solution, amount of coprecipitant, and addition of sulfide for the removal of As(V), Cd(II), Cr(III), Cr(VI), Cu(II), Hg(II) and Pb(II) metal ions ($10{\mu}g/ml$ each). The coprecipitation was about 80% - 95% only for lead at low pH but under 10% for other ions. The amount of removal was about 95% - 100% for Cd, Hg, Pb, Cu in the all pH range by the addition of sulfide with barium sulfate but As(V) and Cr(III, VI) ions were not affected by the same conditions.

Removal of Cupper(II), Zinc(II) in Marine Environment by Heavy Metal Resistant Desulfovibrio desulfuricans (중금속 내성이 있는 Desulfovibrio desulfuricans를 이용한 해양 환경에서의 Cu(II), Zn(II) 제거)

  • Joo, Jeong Ock;Kim, In Hwa;Oh, Byung-Keun
    • KSBB Journal
    • /
    • v.29 no.3
    • /
    • pp.139-144
    • /
    • 2014
  • Microorganisms play a significant role in bioremediation of heavy metal contaminated seawater. In this study, we reported an effective removal of Cu and Zn in marine envionment by using Desulfovibrio desulfuricans (D. desulfuricans) which belong to sulfate reducing bacteria. D. desulfuricans showed stable growth characteristics in high salt concentration and had resistance to heavy metals. Cu and Zn was removed not only by physical adsorption on the surface of bacteria but also by precipitation reaction of microbial metabolism by D. desulfuricans in seawater. In case of different heavy metal concentration, Cu was effectively removed 85% at 25 ppm and 60% at 50 ppm and Zn was effectively removed 54% at 50 ppm and 46% at 200 ppm, respectively.

Study on the Effect of Iron-based Metal Catalysts on the Thermal Decomposition Behavior of ABS (Iron계 금속 촉매가 ABS의 열분해 거동에 미치는 영향에 관한 연구)

  • Jang, Junwon;Kim, Jin-Hwan;Bae, Jin-Young
    • Applied Chemistry for Engineering
    • /
    • v.16 no.4
    • /
    • pp.496-501
    • /
    • 2005
  • The thermal degradation of ABS in the presence of iron-based metal catalysts has been studied by thermogravimetric analysis (TGA). The reaction of iron-based metal catalysts (ferric nitrate nonahydrate, ammonium ferric sulfate dodecahydrate, iron sulfate hydrate, ammonium ferric oxalate, iron(II) acetate, iron(II) acetylacetonate and ferric chloride) with ABS has been found to occur during the thermal degradation of ABS. In a nitrogen atmosphere, char formation was observed, and at $600^{\circ}C$ approximately 3~23 wt% of the reaction product was non-volatile char. The resulting enhancement of char formation in a nitrogen atmosphere has been primarily due to the catalytic crosslinking effect of iron-based metal catalysts. On the other hand, char formation of ABS in air at high temperature by iron-based metal catalyst was unsuccessful due to the oxidative degradation of the char.

Evaluation of Affecting Factors on the Ferrous Catalyzed Sodium Persulfate Oxidation for the Destruction of Organic Pollutant (과황산나트륨을 이용한 유기 오염물 산화와 영향인자 평가)

  • Yun, Yeobog;Park, Haimi;Ko, Sunghwan;Ko, Seokoh
    • Journal of Korean Society on Water Environment
    • /
    • v.25 no.1
    • /
    • pp.151-158
    • /
    • 2009
  • The objective of this study was to determine on optimum ratio of oxidant and catalyst and to evaluate affecting factors such as anions and cations on persulfate oxidation of organic pollutant. Fe(II) activated the persulfate anion to produce a sulfate free radicals and thus effectively used to degrade the target organic pollutant in aqueous system. The chloride ions reacted with sulfate radical produced the $Cl^{\cdot}$ atom and had positive effects on the oxidation of organic pollutant at the initial stage. However, it was observed that chloride ions had the scavenging effects on the rate of oxidation of organic pollutant. Cations and some heavy metals were partly able to activate the persulfate anion to generate a sulfate free radical. However, high levels of cations inhibited the oxidation of organic pollutant.

Adsorption of Ni(II), Co(II), and Mg(II) from Sulfuric Acid Solution by Diphonix Resin for the Utilization of Laterite Ore (라테라이트광 활용을 위한 황산용액에서 Diphonix 수지의 니켈, 코발트, 마그네슘 흡착)

  • Lee, Man-Seung;Kim, Sang-Bae;Chae, Jong-Gwee
    • Journal of the Mineralogical Society of Korea
    • /
    • v.23 no.3
    • /
    • pp.183-189
    • /
    • 2010
  • It is of importance to separate Ni(II) and Co(II) from Mg(II) in solution which was leached from nickel laterite ore. In order to investigate the possibility of separating Ni(II) and Co(II) from Mg(II), adsorption behavior of the three metals from individual and mixed sulfate solutions was investigated by using Diphonix resin. The concentration of each metal in solution was fixed at 100 ppm and the pH of the sulfuric acid solution was changed from 5 to 7. At ambient temperature, the adsorption behavior of the three metal ions followed Langmuir adsorption isotherm. The loading capacity of Diphonix resin for the three metal ions was obtained from the Langmuir isotherm. Since adsorption behavior of the three metal ions from the mixed solution was similar to each other, it was found to be difficult to separate Ni(II) and Co(II) from Mg(II) by using Diphonix resin.

Preparation of Organic-inorganic Hybrid PES Membranes using Fe(II) Clathrochelate (Fe(II) clathrochelate을 이용한 유.무기 PES 복합막의 제조)

  • Jung, Bo Ram;Son, Yeji;Lee, Yong Taek;Kim, Nowon
    • Membrane Journal
    • /
    • v.23 no.1
    • /
    • pp.80-91
    • /
    • 2013
  • Metal-templated condensation of cyclohexanedione dioxime and phenylboronic acid in the presence of Fe(II) sulfate heptahydrate proceeds cleanly in methanol to furnish the Fe(II) clathrochelate. An organic/inorganic hybrid membranes composed of Fe(II) clathrochelate and polyethersulfone was prepared by using phase inversion method. For membrane preparation, the Fe(II) clathrochelate was highly soluble (3~5 g/L) in DMF, NMP, and DMAc, which meets the requirements for the solubility of metal complexes in polar aprotic solvent used in membrane preparation. It was stable even in the presence of strong acids, such as trifluorosactic acid (pKa = 0.3). It was characterized by UV-vis spectroscopy, and their stability in solution phase studied in the presence of (i) strong acids or (ii) competing chelates. Organic/inorganic hybrid membranes were prepared with polyethersulfone, polyvinylpyrrolidone, p-toluenesulfonic acid, Fe(II) clathrochelate and DMF by using nonsolvent induced phase inversion method. The addition of Fe(II) clathrochelate leads increase of surface pore density, mean pore size and flux. We can obtain highly asymmetric membranes by addition of Fe(II) clathrochelate.

Studies of Low Temperature Dyeing on Silk Fiber II. Low Temperature Dyeing of Silk Fiber with the Complex Dye (견의 저온염색에 관한 연구 II. 산성 Metal Complex 염료에 있어서의 저온염색)

  • 배도규;배현석
    • Journal of Sericultural and Entomological Science
    • /
    • v.35 no.1
    • /
    • pp.48-51
    • /
    • 1993
  • Using the new type auxiliary(K-1), dyeing experiment was done at the various dyeing conditions and the effects of auxiliary on the dyeing properties of metal complex dye for the silk fiber were dicussed. The exhaust rate was higher in the auxiliary 3% o.w.f. addition than sodium sulfate 50% o.w.f. The decreasing ratio of exhaust rate according to dye concentration increasing was lower at auxiliary addition than auxiliary non-addition. The exhaust rate according to increasing dyeing temperature was higher in the auxiliary addition than non-addition.

  • PDF

Temporal and Spatial Variation and Removal Efficiency of Heavy Metals in the Stream Water Affected by Leachate from the Jiknaegol Tailings Impoundment of the Yeonhwa II Mine (제2연화광산 직내골 광미장 침출수에 오염된 하천수계의 시.공간적 수질변화 및 중금속 제거효율)

  • Lee, Pyeong-Koo;Kang, Min-Ju;Choi, Sang-Hoon
    • Journal of Soil and Groundwater Environment
    • /
    • v.16 no.1
    • /
    • pp.19-31
    • /
    • 2011
  • This study had been carried out to investigate spatial and temporal variations of the concentrations of trace metals for contaminated surface water in creek affected by leachate from the tailings impoundment of the Yeonhwa II mine for about 2 years. It was also to ascertain the metal removal efficiency for potentially deleterious metals by the artificial and natural attenuation processes such as retention ponds and hydrologic mixing of uncontaminated tributaries. The concentrations of As, Pb, Cd, and Cu for leachate in the rainy season were not detected. On the other hand, the concentrations of Zn, Fe, Mn, Al, and $SO_4^{2-}$ in the rainy season for leachate were 2-66 times higher than those in the dry season, due to the oxidation of the sulfide minerals and the dissolution of the secondary minerals. The concentrations of Zn and Cd for leachate and surface water of the upper creek in the rainy season exceeded the criteria of River Water Quality and Drinking Water Quality but in the dry season, those of analyzed all the metals (As, Pb, Cd, Cu, Zn, Cd, Fe, Mn, and Al) for surface water sampled at the study area were below the criteria of River Water Quality and Drinking Water Quality. In regard of the attenuation efficiency for the concentrations of metals, Fe, Mn, Al, Zn, Cd, As, and Cu were removed highly at retention ponds, while the removal efficiency for major cations and sulfate ($SO_4^{2-}$) were related to mixing of the uncontaminated tributaries. Therefore, the major attenuation processes of the metal and sulfate contents in creek affected by leachate from a tailing dump were precipitation (accompanied by metal co-precipitation and sorption), water dilution, and neutralization.