• 제목/요약/키워드: copper ions

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N,N-Dimethylformamide 용액 중에서 Zn(II)-Bilirubin 착물의 전기화학적 거동 (Electrochemical Behavior of Zn(II)-Bilirubin Complex in N,N-Dimethylformamide)

  • 배준웅;이흥락;박태명;서무룡
    • 대한화학회지
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    • 제37권7호
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    • pp.672-676
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    • 1993
  • DMF 용액 중에서 zinc(II) 이온과 copper(II) 이온의 bilirubin과의 착물형성 여부를 조사하고 Zn(II)-bilirubin(이하 Zn(II)-BR로 줄임) 착물의 전기화학적 성질을 여러가지 전기화학적인 방법으로 조사하였다. Zn(II)는 DMF 용액 중에서 bilirubin과 착물을 형성하였으나, Cu(II)는 bilirubin과 착물을 형성하지 않고 오히려 bilirubin의 산화를 촉진시켰다. Zn-BR 착물은 3단계의 환원과정을 거치며, 제1파와 제2파의 환원전류는 반응성 전류가 약간 포함된 환산전류이었으며, 제3파의 환원전류는 확산지배적인 전류이었다.

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Antifungal Activities of Copper(II) with Biosensitive Macrocyclic Schiff Base Ligands Derived from 4-Aminoantipyrine Derivatives

  • Gopalakrishnan, S.;Joseph, J.
    • Mycobiology
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    • 제37권2호
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    • pp.141-146
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    • 2009
  • Novel copper(II) complexes have been synthesized from the macrocyclic Schiff bases derived from Knoevenagel condensed ${\beta}$-ketoanilides (obtained by the condensation of acetoacetanilide and substituted benzaldehydes), 4-aminoantipyrine and ophenylene diamine. The structural features have been determined from their analytical and spectral data. All the Cu(II) complexes exhibit square planar geometry. Their high molar conductance values support their 1 : 2 electrolytic nature. The magnetic moment data provide evidence for the monomeric nature of the complexes. The X-band ESR spectra of the |$CuL^1$|$(OAc)_2$ in DMSO solution at 300 and 77 K were recorded and their salient features are reported. The in vitro biological screening effects of the investigated compounds were tested against the bacterial species Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Proteus vulgaris and Pseudomonas aeruginosa and fungal species Aspergillus niger, Rhizopus stolonifer, Aspergillus flavus, Rhizoctonia bataicola and Candida albicans by well diffusion method. A comparative study of inhibition values of the Schiff bases and their complexes indicate that complexes exhibit higher antimicrobial activity than the Schiff bases. Copper ions proved to be essential for the growth-inhibitor effect. The extent of inhibition appeared to be strongly dependent on the initial cell density and on the growth medium.

칠기탕(七氣湯) 약침액(藥鍼液)이 활성산소종, 활성질소종, 지질과산화 및 LDL의 산화에 미치는 영향 (Effect of Chilgitang Extract for Herb-Acupuncture on ROS, RNS, Lipid Peroxidation and LDL oxidation)

  • 신정수;문진영
    • Korean Journal of Acupuncture
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    • 제25권4호
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    • pp.89-104
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    • 2008
  • Objectives : This study was undertaken to determine the in vitro antioxidant activity of the extract of Chilgitang herb-acupuncture solution (CHAS). Methods : The radical scavenging capacity was tested by 2,2-diphenyl-1-picryl-hydrazyl (DPPH), hypoxanthine-xanthine oxidase system, DCFH-DA assay, nitric oxide and peroxynitrite generating system. In addition, antioxidant activity on copper and AAPH mediated human low-density lipoprotein (LDL) oxidation was measured by using TBARS assay and relative electrophoretic mobility assay. The amount of total phenolic compounds was assayed by the Folin-Ciocalteu method. Results : CHAS revealed a potent scavenging activity on DPPH radical(82%), superoxide anions(73%), hydroxyl radical(63%), nitric oxide (99%) and peroxynitrite (99%). Moreover, CHAS showed a strong inhibitory effect (59%) on $FeCl_2$-ascorbic acid induced lipid peroxidation of rat liver homogenate. CHAS also markedly inhibited copper(81%) and AAPH(56%)-mediated LDL oxidation, and effectively suppressed the electrophoretic mobility during exposure of human LDL to copper ions. CHAS (82 mg/g) contained higher concentration of total phenolic compounds than that of water extract (45 mg/g) obtained from Chilgitang. Conclusions : These results indicate that CHAS may protect against ROS- or RNS involved diseases, including cardiovascular diseases.

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아크릴 섬유의 아미도옥심화에 관한 연구(I) -아미도옥심 반응과 천이금속의 흡착능- (Studies on Amidoximated Acrylic Fiber(I) -Amidoximation and Adsorption Capacity to Transition Metals -)

  • Chin, Young Gil;Kim, Kyu Beom
    • 한국염색가공학회지
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    • 제8권6호
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    • pp.40-46
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    • 1996
  • In order to investigate a practical application of fibrous absorbents to transition metals such as copper, nickel, cobalt, chrome, and iron, amidoximated fiber as a particular class of solid chelate agents were prepared from acrylic fibers treatment with hydroxylamine. The adsorption mechanisms of metal ions onto amidoximated acrylic fibers and their complexes were studied. Amidoximation of acrylic fiber with hydroxylamine is found to be first-order reaction, followed by the disappearance of infrared adsorption peaks due to nitrile groups of acrylic fibers. The uptake of metal ions onto amidoximated acrylic fiber is increased with temperature raising and the adsorption is also depended on pH of the soiutions. About 70% of metal ions can be recovered from aqueous solutions of Ni(II), Co(II), Cr(III), and Fe(II) on the concentration below 5x 10$^$^{-4}$ in the range of pH 2.1~10.0. Transition metals are adsorbed to form complex with amidoxime group by the ligand sites such as C=N, NH, NO, NHOH.OH.

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Solidification and Leaching Characteristics of Cyclone Ash from Industrial Incineration Plant

  • Lee, Dong-Choon;Kim, Young-Ju
    • Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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    • 제10권S_2호
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    • pp.89-95
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    • 2001
  • The solidification and leaching characteristics of cyclone ash collected from an industrial incineration plant were investigated. Cement and calcium hydroxide were used as the solidifying materials. The leaching characteristics of the solidified cyclone ash were found to vary depending on both the quantitative and the qualitative aspects of the solidifying materials. Except for copper and lead, all the heavy metal ions in the leachate of the solidified material composed of 10~20 % cement or 10~20 % calcium hydroxide were found to be within their standard limit. Moreover, all the heavy metal ions were also observed to be within satisfactory limits in the leachate obtained from the solidified material composed of 30 % cement or 30 % calcium hydroxide. Therefore, to satisfy the standard compressive intensity and permissible limits of heavy metal ions leached from solidified material, it would appear that a 30 % proportion of either additive in the solidification product can meet the required standard for the leachate. The cost of solidifying cyclone ash per ton for ash-30 % cement and ash-30 % lime was calculated as 26,750 and 26,070 won, respectively. Accordingly, significant reduction in the waste toxicity and mobility as well as an improvement in the engineering properties of the solidified products were successfully achieved.

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Synthesis of a New Hexadendates Schiff's Base and Its Application in the Fabrication of a Highly Selective Mercury(II) Sensor

  • Ganjali, M.R.;Norouzi, P.;Alizadeh, T.;Salavati-Niasari, M.
    • Bulletin of the Korean Chemical Society
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    • 제28권1호
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    • pp.68-72
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    • 2007
  • A new PVC membrane potentiometric sensor that is highly selective to Hg2+ ions was prepared, using bis(2-hydroxybenzophenone) butane-2,3-dihydrazone (HBBD) as an excellent hexadendates neutral carrier. The sensor works satisfactorily in the concentration range of 1.0 × 10-6 to 1.0 × 10-1 mol L-1 (detection limit 4 × 10-7 mol L-1) with a Nernstian slope of 29.7 mV per decade. This electrode showed a fast response time (~8 s) and was used for at least 12 weeks without any divergence. The sensor exhibits good Hg2+ selectivity for a broad range of common alkali, alkaline earth, transition and heavy metal ions (lithium, sodium, potassium, magnesium, calcium, copper, nickel, cobalt, zinc, cadmium, lead and lanthanum). The electrode response is pH independent in the range of 1.5-4.0. Furthermore, the developed sensor was successfully used as an indicator electrode in the potentiometric titration of mercury ions with potassium iodide and the direct determination of mercury in some binary and ternary mixtures.

Aspergillus niger 균주를 이용(利用)한 코발트 정광(精鑛)으로부터 코발트 및 구리의 미생물(微生物) 침출(浸出) 연구(硏究) (A Study on the Bioleaching of Cobalt and Copper from Cobalt Concentrate by Aspergillus niger strains)

  • 안효진;안재우;방덕기;김명운
    • 자원리싸이클링
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    • 제22권2호
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    • pp.44-52
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    • 2013
  • 코발트 정광으로부터 코발트와 구리의 회수를 위하여 3종의 Aspergillus niger 균을 이용하여 각 금속의 침출거동을 조사하였다. 주요 실험 변수로는 균주 종류에 따른 유기산 생성량, pH 및 고액농도비 등 이었다. 실험결과 유기산(구연산 및 옥살산) 생성양의 경우 A. niger KCTC 6144가 Malt Extract Broth 배지에서 초기 pH 3.5에서 가장 좋았다. 한편 코발트 및 구리 침출실험결과로는 A. niger KCTC 6985를 사용한 경우가 효과적이었는데, 고액농도 10 g/L인 경우, pH 3.5, $24^{\circ}C$에서 약 15일 경과 후 코발트의 경우는 82%, 구리는 98%의 침출율을 나타내었다.

Copper Seed Layer 형성 및 도금 첨가제에 따른 Copper Via Filling (Formation of Copper Seed Layers and Copper Via Filling with Various Additives)

  • 이현주;지창욱;우성민;최만호;황윤회;이재호;김양도
    • 한국재료학회지
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    • 제22권7호
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    • pp.335-341
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    • 2012
  • Recently, the demand for the miniaturization of printed circuit boards has been increasing, as electronic devices have been sharply downsized. Conventional multi-layered PCBs are limited in terms their use with higher packaging densities. Therefore, a build-up process has been adopted as a new multi-layered PCB manufacturing process. In this process, via-holes are used to connect each conductive layer. After the connection of the interlayers created by electro copper plating, the via-holes are filled with a conductive paste. In this study, a desmear treatment, electroless plating and electroplating were carried out to investigate the optimum processing conditions for Cu via filling on a PCB. The desmear treatment involved swelling, etching, reduction, and an acid dip. A seed layer was formed on the via surface by electroless Cu plating. For Cu via filling, the electroplating of Cu from an acid sulfate bath containing typical additives such as PEG(polyethylene glycol), chloride ions, bis-(3-sodiumsulfopropyl disulfide) (SPS), and Janus Green B(JGB) was carried out. The desmear treatment clearly removes laser drilling residue and improves the surface roughness, which is necessary to ensure good adhesion of the Cu. A homogeneous and thick Cu seed layer was deposited on the samples after the desmear treatment. The 2,2'-Dipyridyl additive significantly improves the seed layer quality. SPS, PEG, and JGB additives are necessary to ensure defect-free bottom-up super filling.

탄자니아의 소규모 광산에서 구리광석 정제를 위한 침출 및 용매 추출에 관한 연구 (A Study on Leaching and Solvent Extraction for the Recovery of Copper Ore for Small-Scale Mining in Tanzania)

  • 소순영;전용진;암브로즈 이티카
    • 한국산학기술학회논문지
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    • 제18권4호
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    • pp.438-445
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    • 2017
  • 탄자니아에는 풍부한 구리 매장량이 있으나, 적절한 구리 회수 공정의 결핍과 광산 기술 개발을 위한 자금 부족으로 구리 금속의 추출량은 여전히 낮은 상태이다. 이에 따라 소규모 구리 채굴을 위한 간단한 처리공정 개발에 중점을 두어 구리광석에서 구리를 추출하기 위한 침출법과 용매 추출법을 연구하였다. 사용된 구리광석은 규공작석이었으며, 침출 시약으로 황산을 사용하였다. 침출 공정에서 시료의 입경이 $53{\mu}m$보다 작고, 98%(w/w) 황산 농도가 5.0 g/L, 교반 속도가 60에서 80 rpm일 때 최대 구리 회수율이 95.1% 이었다. 용매 추출에서 구리 2가 양이온의 최고의 선택 비율은 등유에 녹인 15 % LIX-70을 이용하여 얻어졌다. pH가 0.5에서 3.0까지, 구리 2가 양이온 추출 효율은 pH가 증가함에 따라 증가했다. 그러나 3.0이상의 pH에서는 다른 금속 이온이 구리 2가 양이온보다 유기물층으로 더 많이 추출되었다. 최고의 용매 추출율은 15% LIX-70를 사용하여 각각 pH 2.0 및 3.0에서 96.5% 이었다.

톱밥을 이용한 중금속 제거에 관한 연구 (Heavy Metal Removal using Sawdust)

  • 전충;김정환
    • 유기물자원화
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    • 제15권2호
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    • pp.81-88
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    • 2007
  • 톱밥을 이용한 중금속 제거에 관한 연구가 수행되어졌다. 납, 구리, 카드뮴 이온들 중에서 납의 흡착능이 pH 4에서 0.22 mmol/g-dry mass로서 가장 높았다. 톱밥의 표면상태와 납이온의 존재 여부는 FT-IR, SEM(Scanning Electron Microscopy) 그리고, EDX(Energy Dispersive X-ray)에 의해서 확인되어졌다. 초기 납 농도가 100ppm일때 0.5g의 톱밥으로 약 90%의 납 이온을 제거할 수 있었다. Langmuir model 식을 이용하여 납 이온에 대한 등온흡착선을 묘사하였으며 실험결과는 모델식에서 얻어진 결과와 잘 부합되었다. 또한 대부분의 흡착은 60분 내에 이루어졌으며 납 이온 용액의 pH는 5.8에서 4.5로 시간에 따라 감소하였다.

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