• Title/Summary/Keyword: Competitive metal

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Competitive Adsorption Characteristics of Cupper and Cadmium Using Biochar Derived from Phragmites communis (갈대 biochar의 구리 및 카드뮴 경쟁흡착특성)

  • Park, Jong-Hwan;Kim, Seong-Heon;Shin, Ji-Hyun;Kim, Hong Chul;Seo, Dong Cheol
    • Korean Journal of Environmental Agriculture
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    • v.34 no.1
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    • pp.21-29
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    • 2015
  • BACKGROUND: Heavy metal adsorptionnot only depends on biochar characteristics but also on the nature of the metals involved and on their competitive behavior for biochar adsorption sites. The goal of this study was to investigate the competitive absorption characteristics of Cu and Cd in mono-metal and binary-metal forms by biochar derived from Phragmites communis. METHODS AND RESULTS: Batch and column experiments were conducted to evaluate the competitive adsorption characteristics of the biocharfor Cu and Cd. In the batch experiments, the maximum adsorption capacity of Cd(63 mg/g) by biochar was higher than that for Cu (55 mg/g) in the mono-metal adsorption isotherm. On the other hand, the maximum Cu adsorption capacity (40 mg/g) by biochar was higher than that for Cd(25 mg/g) in the binary-metal adsorption isotherm. Cu was the most retained cations. Cd could be easily exchanged and substituted by Cu. The amounts of adsorbed metals in the column experiments were in the order of Cd (121 mg/g) > Cu (96 mg/g) in mono-metal conditions, and Cu (72 mg/g) > Cd (29 mg/g) in binary-metal conditions. CONCLUSION: Overall, the results demonstrated that competitive adsorption among metals increased the mobility of these metals. Particularly, Cd in binary-metal conditions lost its adsorption capacity most significantly.

Competitive Solvent Extractions of Alkaline Earth Metal Cations by Crown Ether Phosphonic Acid Monoethyl Esters (크라운에테르 포스포닉산 모노에틸 에스테르에 의한 알칼리 토금속 양이온의 경쟁 용매추출)

  • Chung, Yeong-Jin
    • Journal of the Korean Applied Science and Technology
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    • v.22 no.1
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    • pp.9-14
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    • 2005
  • Competitive solvent extraction of alkaline earth metal cations from water into organic solvent containing the carboxylic acid crown ether and analogous crown ether phosphonic acid monoethyl esters were investigated. sym-(n-Decyldibenzo)-16-crown-5xyacetic acid $\underline{1}$ and monoethyl sym-(n-decyldibenzo)-16-crown-5-oxymethylphosphonic acid $\underline{3}$ are structurally identical except for the ionizable groups. Both of them provide similar extraction behavior in terms of efficiency and selectivity, but monoethyl sym-(n-decyldibenzo)-16-crown-5-oxymethylphosphonic acid $\underline{3}$ showed higher alkaline earth metals loadings at acidic or neutral media. Monoethylsym-(n-octyldibenzo)-16-rown-5-oxymethylphosphonic acid $\underline{2}$ showed better selectivity and alkaline earth metals loading than did the analogous sym-(n-octyldibenzo)-16-crown-5-oxymethyldiphosphonic acid $\underline{6}$.

Design and estimate of metal bearing test machine (메탈베어링 시험기의 설계와 평가)

  • 황영모;전재억;박후명;김수광;하만경
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.10a
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    • pp.480-484
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    • 2004
  • Despite is product that existent higher hrust engine, ship, vehicles, development equipment and Metal Bearing for plant equipment Cast White Metal Lining Bearing that is Bimetal Bearing standing 2 generation is accomplishing master and servant and this is foreseen to be used widely on industry whole in hereafter but Cast White Metal Bearing need minuteness processing, price competitive power is depending on income from superior another thing area than itself manufacture already in advanced nation to lowdown that the technique is generalized widely.

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Chromatographic Behavior of Proteins on Stationary Phase with Aminocarboxy Ligand

  • Li, Rong;Ju, Ming-Yang;Chen, Bin;Sun, Qing-Yuan;Chen, Guo-Liang;Shi, Mei;Wang, Xiao-Gang;Zheng, Jian-Bin
    • Bulletin of the Korean Chemical Society
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    • v.32 no.2
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    • pp.590-594
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    • 2011
  • An aminocarboxy aspartic acid-bonded silica (Asp-Silica) stationary phase was synthesized using L-aspartic acid as ligand and silica gel as matrix. The standard protein mixtures were separated with prepared chromatographic column. The effects of solution pH, salt concentration and metal ion on the retention of proteins were examined, and also compared with traditional iminodiacetic acid-bonded silica (IDA-Silica) column. The results show that Asp-Silica column exhibited an excellent separation performance for proteins. The retention of proteins on Asp-Silica stationary phase was consistent with electrostatic characteristic of cation-exchange. The stationary phase displayed typical metal chelate property after fixing copper ion (II) on Asp-Silica. Under competitive eluting condition, protein mixtures were effectively isolated. Asp ligand showed better ion-exchange and metal chelating properties as compared with IDA ligand.

Competitive Adsorption Characteristics of Rapid Cooling Slag in Single- and Multi-Metal Solutions (단일 및 복합중금속용액에서 제강급랭슬래그의 경쟁흡착특성)

  • Park, Jong-Hwan;Kim, Hong-Chul;Kim, Seong-Heon;Lee, Seong-Tae;Kang, Byung-Hwa;Kang, Se-Won;Seo, Dong-Cheol
    • Korean Journal of Environmental Agriculture
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    • v.35 no.1
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    • pp.24-31
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    • 2016
  • BACKGROUND: Heavy metal adsorption not only depends on rapid cooling slag(RCS) characteristics but also on the nature of the metals involved and on their competitive behavior for RCS adsorption sites. The goal of this study was to investigate the competitive absorption characteristics of Cu, Cd and Zn in single- and multi-metal forms by RCS.METHODS AND RESULTS: Both single- and multi-metal adsorption experiments were conducted to determine the adsorption characteristics of RCS for the heavy metals. Adsorption behaviors of the heavy metals by RCS were evaluated using both the Freundlich and Langmuir adsorption isotherm equations. The maximum adsorption capacities of metals by RCS were in the order of Cu(16.6 mg/g) > Cd(8.1 mg/g) > Zn(6.2 mg/g) in the single-metal adsorption isotherm and Cu(14.5 mg/g) >> Zn(1.3 mg/g) > Cd(0.6 mg/g) in the multi-metal adsorption isotherm. Based on data obtained from Freundlich and Langmuir adsorption models and three-dimensional simulation, multi-metal adsorption behaviors differed from single- metal adsorption due to competition. Cadmium and Zn were easily exchanged and substituted by Cu during multi-metal adsorption.CONCLUSION: Results from adsorption experiments indicate that competitive adsorption among metals increases the mobility of these metals.

Studies on the Macrocycle-mediated Transport of Divalent Metal Ions in a Supported Liquid Membrane System

  • 조문환;신상철
    • Bulletin of the Korean Chemical Society
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    • v.16 no.1
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    • pp.33-36
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    • 1995
  • Macrocyclic ligands have been studied as cation carriers in a supported liquid membrane system. Cd2+ has been transported using nitrogen substituted macrocycles as carriers and several divalent metal ions (M2+=Zn, Co, Ni, Cu, Pb, Mg, Ca, and Sr) have been transported using DBN3O2, DBN2O2and PolyNtnoen as carriers in a supported liquid membrane system. Competitive Cd2+-M2+ transport studies have also been carried out with the same system. Ligand structure, stability constant, membrane solvent and carrier concentration are also important parameters in the transport of metal ions.

High strength's union of mass layers metal bearing (고강성 다층 메탈베어링의 접합)

  • 전재억;황영모;김수광;계중읍;김준안;하만경
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.792-795
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    • 2004
  • Despite is product that ship, vehicles, development equipment and Metal Bearing for plant equipment that is mass-produced by present domestic companies Cast White Metal Lining Bearing that is Bimetal Bearing standing 2 generation is accomplishing master and servant and this is foreseen to be used widely on industry whole in hereafter but Cast White Metal Bearing need minuteness processing, while price competitive power is depending on income from superior another thing area than itself manufacture already in advanced nation to lowdown that the technique is generalized widely, when take into account technology change aspect of industrial technology developing country, Go added value creation by deepening of price competition is judged to be difficult hereafter. Because domestic production and supply are wholly lacking almost in Metal Bearing Cladding that take advantage of these technology, Data-base about connection technology is weak with technique and Know-How for product. This research unites Back Steel and Aluminium Alloy different kind metal and make the Clad river studying technology about union of Gogangseong Dacheung metal bearing hereupon.

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Optimization of spring back in U-die bending process of sheet metal using ANN and ICA

  • Azqandi, Mojtaba Sheikhi;Nooredin, Navid;Ghoddosian, Ali
    • Structural Engineering and Mechanics
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    • v.65 no.4
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    • pp.447-452
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    • 2018
  • The controlling and prediction of spring back is one of the most important factors in sheet metal forming processes which require high dimensional precision. The relationship between effective parameters and spring back phenomenon is highly nonlinear and complicated. Moreover, the objective function is implicit with regard to the design variables. In this paper, first the influence of some effective factors on spring back in U-die bending process was studied through some experiments and then regarding the robustness of artificial neural network (ANN) approach in predicting objectives in mentioned kind of problems, ANN was used to estimate a prediction model of spring back. Eventually, the spring back angle was optimized using the Imperialist Competitive Algorithm (ICA). The results showed that the employment of ANN provides us with less complicated and time-consuming analytical calculations as well as good results with reasonable accuracy.

Development of Rapid Prototyping Technique using Sheet Metal and Projection Welding (금속박판과 프로젝션 용접을 이용한 쾌속 조형법의 개발)

  • 이상찬;최진호
    • Journal of Welding and Joining
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    • v.22 no.2
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    • pp.46-50
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    • 2004
  • In today's highly competitive marketplace, it is of great significance for the manufacturing industry to reduce lead-time and costs fur the product development. Since first emerged in 1986, Rapid Prototyping (RP) technology has helped successfully to reduce time and costs. Recently, RP using functional materials such as metal has been researched. However RP using the molten metal has been struggling to resolve several drawbacks, such as dimensional inaccuracy, poor surface finish, post finishing, etc., that originate primarily from the overall deposition of molten metal for each layer. So, the purpose of this study is to develop a new RP technique using sheet metal and projection welding for reducing several drawbacks in occurring RP using molten metal. Also tensile and bending specimens were made by the developed RP process using projection welding and were verified.

Net-shape Manufacturing of Micro Porous Metal Components by Powder Injection Molding

  • Nishiyabu, Kazuaki;Matsuzaki, Satoru;Tanaka, Shigeo
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09a
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    • pp.93-94
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    • 2006
  • A novel production method for porous metal components has been developed by applying powder space holder (PSH) method to metal powder injection molding (MIM) process. The PSH-MIM method has an industrial competitive advantage that is capable of net-shape manufacturing the micro-sized porous metal products with complicated shapes and controlled porosity and pore size. In this study, the small impeller with homogeneous micro-porous structure was manufactured by the PSH-MIM method. The effects of combinations in size and fraction of PMMA particle on dimensional tolerance and variation of sintered porous specimens were investigated. It was concluded that the PSH-MIM method could manufacture commercially microporous metal components with high dimensional accuracy.

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