• Title, Summary, Keyword: Cu (II) ions

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Adsorption of heavy metals Cu(II), Pb(II) and Cd(II) on Cichory (치커리에 의한 중금속 Cu(II), Pb(II), Cd(II)의 흡착능)

  • 박문숙;양미경
    • Journal of environmental and Sanitary engineering
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    • v.12 no.1
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    • pp.97-100
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    • 1997
  • The adsorption of the Chchory particles on Cu(II), Pb(II) and Cd(II) ions were examined by measurements of the adsorption percentage under various condition of temperature, pH, times, heavy metal concentration. Each of 100ml sample solution of Cu(II), Pb(II) and Cd(II) ions mixed with 2g of the Cichory under stirring in shaking water bath for minutes. The solutions were then filtered and pretreatmented according to water pollution official test methods. The concentrations of Cu(II), Pb(II) and Cd(II) ions in the solution were determined by the atomic adsorption spectrophotometer. As a results, the most effective pH of the adsorption of Cu(II), Pb(II) and Cd(II) was 9. With increasing the concentration of heavy metals the amount of adsorption on Cichory was increased. The adsorption equilibrium of Pb(II) and Cd(II) ions were reached to equilibrium by shaking for about 40 minutes. The absorptivities were 85%, 75% respectively.

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Removal of Toxic Pollutants from Aqueous Solutions by Adsorption onto Organo-kaolin

  • Sayed Ahmed, S.A.
    • Carbon letters
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    • v.10 no.4
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    • pp.305-313
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    • 2009
  • In this study, the adsorption of toxic pollutants onto cetyltrimethylammonium kaolin (CTAB-Kaolin) is investigated. The organo-kaolin is synthesized by exchanging cetyltrimethylammonium cations (CTAB) with inorganic ions on the surface of kaolin. The chemical analysis, the structural and textural properties of kaolin and CTAB-kaolin were investigated using elemental analysis, FTIR, SEM and adsorption of nitrogen at $-196^{\circ}C$. The kinetic adsorption and adsorption capacity of the organo-kaolin towards o-xylene, phenol and Cu(II) ion from aqueous solution was investigated. The kinetic adsorption data of o-xylene, phenol and Cu(II) are in agreement with a second order model. The equilibrium adsorption data were found to fit Langmuir equation. The uptake of o-xylene and phenol from their aqueous solution by kaolin, CTAB-kaolin and activated carbon proceed via physisorption. The removal of Cu(II) ion from water depends on the surface properties of the adsorbent. Onto kaolin, the Cu(II) ions are adsorbed through cation exchange with $Na^+$. For CTAB-kaolin, Cu(II) ions are mainly adsorbed via electrostatic attraction with the counter ions in the electric double layer ($Br^-$), via ion pairing, Cu(II) ions removal by the activated carbon is probably related to the carbon-oxygen groups particularly those of acid type. The adsorption capacities of CTAB-kaolin for the investigated adsorbates are considerably higher compared with those of unmodified kaolin. However, the adsorption capacities of the activated carbons are by far higher than those determined for CTAB-kaolin.

Simultaneous Detection of Cd (II), Pb (II), Cu (II), and Hg (II) Ions in Dye Waste Water Using a Boron Doped Diamond Electrode with DPASV

  • Yoon, Jang-Hee;Yang, Jee-Eun;Kim, Jong-Phil;Bae, Jong-Seong;Shim, Yoon-Bo;Won, Mi-Sook
    • Bulletin of the Korean Chemical Society
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    • v.31 no.1
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    • pp.140-145
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    • 2010
  • The simultaneous detection of Cd (II), Pb (II), Cu (II), and Hg (II) ions in aqueous medium using a BDD electrode with DPASV is described. XPS was used to characterize the chemical states of trace metal ions deposited on the BDD electrode surface. Experimental parameters that affect response, such as pH, deposition time, deposition potential, and pulse amplitude were carefully optimized. The detection limits for Cd (II), Pb (II), Cu (II), and Hg (II) ions were 3.5 ppb, 2.0 ppb, 0.1 ppb and 0.7 ppb, respectively. The application of the BDD electrode on the electrochemical pretreatment for the simultaneous metal detection in the dye waste water was also investigated.

Removal of Cu (II) and Cd (II) Ions Onto Water Hyacinth Based Carbonaceous Materials

  • Amina, A. Attia;Shouman, Mona.A.;Khedr, S.A.;El-Nabarawy, Th.
    • Carbon letters
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    • v.7 no.4
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    • pp.249-258
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    • 2006
  • Treatment of water hyacinth with sulphuric acid produces carbonaceous materials that have been used to remove Cu(II) and Cd (II) ions from aqueous solutions. Untreated water hyacinth was also used for the subject of comparison. The textural properties of the carbonaceous materials were determined from nitrogen adsorption at 77 K. The optimum pH for the sorption of Cu (II) and Cd (II) ions on the investigated sorbents was determined. Dynamic adsorption measurements have been taken at 298 K whereas equilibrium measurements were carried out at 298, 313 and 323 K. The adsorption of nitrogen at 77 K on the untreated sample was too low and the surface areas of the treated samples 2, 3 and 4 were found between $70-208\;m^2/g$. The total pore volumes of these samples which were determined for the carbonaceous materials investigated were found to be 0.076-0.140 ml/g. The kinetic adsorption data of Cu (II) and Cd(II) were applicable to both pseudo - first and pseudo-second order but fit more the latter order. The equilibrium adsorption data were found to fit Freundlich and Langmiur equations. The values of DG, DH and DS are all negative indicating the feasibility and the spontaneous nature of the sorption of Cu (II) and Cd (II) ions by the sorbents investigated.

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Effects of Fe(III) and Cu(II) Ions on the Autoxidation of L-Ascorbic Acid

  • Kim, Mi-Ok
    • Preventive Nutrition and Food Science
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    • v.6 no.2
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    • pp.83-86
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    • 2001
  • The autoxidation reaction of L-ascorbic acid(AsA), and, particularly, the oxidation rates of AsA in the presence of Fe(III) or Cu(II) ions were determined in water and methanol. UV spectral measurement (at 265 nm) and HPLC were used to determine the remaining amounts of AsA in water and methanol, respectively. It was found that, in the presence of metal ions, the autoxidation rate of AsA was significantly affected by the kinds of solvents used, and also by the kinds of metal ions present. Moreover, the first-order rate constants for the oxidation of non-dissociated AsA compared with dissociated-AsA were investigated. It was confirmed that the oxidation of AsA was more accelerated in the dissociated form of AsA than in the non-dissociated form of AsA in either with Fe(III) or Cu(II). It was also found that the Cu(II) at a concentration of 0.1 $\mu$M had a more significant effect on the first-order rate constants for the autoxidation of AsA than Fe(III) at 5 $\mu$M.

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Effect of Metal Ions on the Sedimentation of Humic Acid (흄산의 침적에 미치는 금속이온의 영향)

  • Park, Yeong Jae;Park, Kyoung Kyun;Chun, Kwan Sik
    • Journal of the Korean Chemical Society
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    • v.40 no.1
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    • pp.50-58
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    • 1996
  • In the presence of metal ions(Co(Ⅱ), Ni(Ⅱ), Sr(Ⅱ), Cu(Ⅱ), Fe(Ⅲ), U(Ⅵ)), the sedimentation of humic acid was increased at constant pH with increasing metal concentration and the strength was increased in the following order: Sr < Ni < Co < Cu < Fe < U. At constant metal concentration, Cu(Ⅱ), Ni(Ⅱ), and Co(Ⅱ) ions caused an increase in sedimentation of humic acid as the solution pH increased, whereas Fe(Ⅲ) and U(Ⅵ) ions caused a decrease. Sr(Ⅱ) ions did not affect the sedimentation even with the variation of pH. The analysis of FT-IR spectra for the sediments prepared from the reaction between humic acid and metal ions showed that metal ions were bound to humic acid to form complexes, suggesting that the metal complexation plays an important role in the sedimentation of humic acid.

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Structural Analysis of [Cu(II)-amyloidogenic peptide] Complexes

  • Cha, Eugene;Seo, Jae-Hong;Kim, Ho-Tae
    • Mass Spectrometry Letters
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    • v.9 no.1
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    • pp.17-23
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    • 2018
  • Studies on the interactions of amyloidogenic proteins with trace metals, such as copper, have indicated that the metal ions perform a critical function in the early oligomerization process. Herein, we investigate the effects of Cu(II) ions on the active sequence regions of amyloidogenic proteins using electrospray ionization mass spectrometry (ESI-MS) and collision induced dissociation tandem MS (CID-MS/MS). We chose three amyloidogenic peptides NNQQNY, LYQLEN, and VQIVYK from yeast prion like protein Sup35, insulin chain A, and tau protein, respectively. [Cu-peptide] complexes for all three peptides were observed in the mass spectra. The mass spectra also show that increasing Cu(II) concentrations decrease the population of existing peptide oligomers. The tandem mass spectrum of NNQQNY shows preferential binding for the N-terminal region. All three peptides are likely to appear to be in a Cu-monomer-monomer (Cu-M-M) structure instead of a monomer-Cu-monomer (M-Cu-M) structure.

Sorption of Ni(II), Cu(II) and Fe(III) ions from Aqueous Solutions Using Activated Carbon (활성탄소를 이용한 수용액으로부터의 Ni(II), Cu(II) 그리고 Fe(III) 이온의 흡착)

  • Hanafi, H.A.;Hassan, H.S.
    • Journal of the Korean Chemical Society
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    • v.54 no.5
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    • pp.533-540
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    • 2010
  • An activated carbon was tested for its ability to remove transition metal ions from aqueous solutions. Physical, chemical and liquid-phase adsorption characterizations of the carbon were done following standard procedures. Studies on the removal of Ni(II), Cu(II) and Fe(III) ions were attempted by varying adsorbate dose, pH of the metal ion solution and time in batch mode. The equilibrium adsorption data were fitted with Freundlich and Langmuir and the isotherm constants were evaluated, equilibrium time of the different three metal ions were determined. pH was found to have a significant role to play in the adsorption. The processes were endothermic and the thermodynamic parameters were evaluated. Desorption studies indicate that ion-exchange mechanism is operating.

Adsorption and Separation Behaviors of Metal Ions Using a Poly-Dibenzo-18-Crown-6 in Aqueous Solution (수용액에서 Poly-dibenzo-18-crown-6를 이용한 금속이온들의 흡착 및 분리 특성)

  • Kim, Hae Joong;Chang, Jeong Ho;Shin, Young-Kook
    • Analytical Science and Technology
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    • v.11 no.4
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    • pp.248-253
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    • 1998
  • The adsorption and separation behaviors of alkali, alkaline earth and transition metal ions using a poly-dibenzo-18-crown-6 were investigated in aqueous solution. The adsorption degree(E) and distribution ratio(D) of alkali, alkaline earth metal ions were Li(I)$t_R$) of metal ions were affected by the adsorption degree(E) and distribution ratio(D). This results showed good separation efficiency of K(I), Sr(II), Ag(I) and Pb(II) from the mixed metal solution.

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Adsorption and Separation of Ag(I) Using a Merrifield Resin Bound NTOE, NDOE in Aqueous Solution (수용액에서 NTOE, NDOE가 결합된 Merrifield 수지를 이용한 Ag(I)의 흡착 및 분리 특성)

  • Lee, Cheal-Gyu;Kim, Hae Joong
    • Analytical Science and Technology
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    • v.12 no.2
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    • pp.159-165
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    • 1999
  • The adsorption and separation behaviors of transition metal ions using a merrifield resin bound 1,12-diaza-3,4:9,10-dibenzo-5,8-dioxacyclopentadecane (NTOE) and 1,12,15-triaza-3,4:9,10-dibenzo-5,8-dioxacycloheptadecane(NDOE) were investigated in aqueous solution. The orders of adsorption degree(E) and distribution ratio(D) of transition metal ions were Cu(II)$t_R$) of metal ions were affected by adsorption degree(E) and distribution ratio(D). This results showed good separation efficiency of Ag(I) from mixed metal solution.

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