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Journal articles on the topic 'Cobaltic ions'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Deraz, Nasr-Allah M. "The Effect of Calcium Doping on the Surface and Catalytic Properties of Cobaltic Oxide Catalysts." Adsorption Science & Technology 21, no. 3 (2003): 229–43. http://dx.doi.org/10.1260/026361703322404386.

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The effects of calcium oxide doping (0.75, 1.5 and 3 mol% CaO) and calcination temperature (400, 500, 600 and 700°C) on different surface properties of Co3O4 were investigated. The structural properties of pure and doped oxide samples were determined by XRD methods, the textural properties were investigated via the adsorption of nitrogen at −196°C while the hydrogen peroxide decomposition activity of the investigated solids was determined by oxygen gasometric measurement of the reaction kinetics at 20–40°C. The dissolution of calcium ions in the Co3O4 lattice at temperatures in the range 400–6

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2

El-Shobaky, Gamil A., Nagi R. E. Radwan, and Farouk M. Radwan. "Catalytic Decomposition of H2O2 over Pure and Li2O-Doped Co3O4 Solids." Adsorption Science & Technology 16, no. 9 (1998): 733–46. http://dx.doi.org/10.1177/026361749801600906.

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Pure and doped Co3O4 samples were prepared by the thermal decomposition at 500–900°C of pure and lithium nitrate-treated basic cobalt carbonate. The amounts of dopant added were varied in the range 0.75–6 mol% Li2O. The effects of this treatment on the surface and catalytic properties of cobaltic oxide solid were investigated using nitrogen adsorption at −196°C and studies of the decomposition of H2O2 at 30–50°C. The results obtained revealed that Li2O doping of Co3O4 followed by heat treatment at 500°C and 600°C resulted in a progressive increase in the value of the specific surface area, SBE

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3

Hernández-Baltazar, Daniel, Eduardo Rivadeneyra-Domínguez, Paola Belem Pensado-Guevara, et al. "Efecto citotóxico de iones metálicos." UVserva, no. 16 (January 18, 2024): 151–68. http://dx.doi.org/10.25009/uvs.vi16.2933.

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Los iones metálicos con actividad biológica como el cobalto, cobre, cromo, hierro y magnaneso participan en la nutrición, respiración, mantenimiento y comunicación celular. Otros iones como el arsénico, cadmio, mercurio y plomo, que si bien son importantes para la dinámica de suelos y ecosistemas, no son parte del mantenimiento de la homeostásis celular, por el contrario su acumulación exacerbada en el organismo puede favorecer alteraciones patofisiológicas. En los últimos años, la exposición a iones metálicos tóxicos ha ido en aumento debido a su consumo en alimentos, o por exposición ambient

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4

K., G. VARSHNEY, A. KHAN A., and S. SIDDIQUI M. "Inorganic Ion-exchangers as New Adsorbents in Peak Paper Chromatographic Studies of Metal Ions : Selective Determination of Nickel(ll) and Cobalt(II) on Papers Impregnated with Chromium(III) and Tin(IV) Arsenosilicates." Journal of Indian Chemical Society Vol. 69, Sep 1992 (1992): 604–5. https://doi.org/10.5281/zenodo.6088025.

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Department of Applied Chemistry, Z. H. College of Engineering and Technology, Aligarh Muslim University, Aligarh-202 002 <em>Manuscript received 23 May 1991, revised 18 June 1992, accepted 3 July 1992</em> Inorganic Ion-exchangers as New Adsorbents in Peak Paper Chromatographic Studies of Metal Ions : Selective Determination of Nickel(ll) and Cobalt(II) on Papers Impregnated with Chromium(III) and Tin(IV) Arsenosilicates.

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5

Yang, Yi Yun. "Spin State and Magnetic Properties of Nd_1-xSr_xCoO₃ (0.1≤x≤0.5)." Advanced Materials Research 785-786 (September 2013): 676–79. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.676.

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In this paper, the rare earth cobaltite Nd1-xSrxCoO3 (0.1≤x≤0.5) samples were prepared using conventional solid state reaction method. Magnetization and spin state of cobalt of sample were systematically investigated. The experimental result suggests that magnetization and the Curie temperature increase sharply with increasing Sr content. The Curie-Weiss fit shows that most of the Co3+ ions are in the intermediate spin state and the Co4+ ions are in low spin for x=0.5. Furthermore, our study confirms that spin-state transition take place in Nd1-xSrxCoO3.

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6

Liu, Si, Shima Farhoosh, Paul Beyer, Stefan Mebs, Michael Haumann, and Holger Dau. "Phosphate Coordination in a Water-Oxidizing Cobalt Oxide Electrocatalyst Revealed by X-ray Absorption Spectroscopy at the Phosphorus K-Edge." Catalysts 13, no. 8 (2023): 1151. http://dx.doi.org/10.3390/catal13081151.

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In the research on water splitting at neutral pH, phosphorus-containing transition metal oxyhydroxides are often employed for catalyzing the oxygen evolution reaction (OER). We investigated a cobalt–phosphate catalyst (CoCat) representing this material class. We found that CoCat films prepared with potassium phosphate release phosphorus in phosphate-free electrolytes within hours, contrasting orders of magnitude’s faster K+ release. For P speciation and binding mode characterization, we performed technically challenging X-ray absorption spectroscopy experiments at the P K-edge and analyzed the

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7

Arbuzova, Tamara I., Sergey V. Telegin, Sergey V. Naumov, Eugeniy I. Patrakov та Olga G. Reznitskih. "Effect of Cobalt Deficiency on Physical Properties of the GdBaCo_2-xO_5+δ Single Crystal". Solid State Phenomena 215 (квітень 2014): 83–88. http://dx.doi.org/10.4028/www.scientific.net/ssp.215.83.

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The effect of cobalt deficiency in a single crystal of double layered cobaltite GdBaCo1.86O5.32 on the magnetic properties was investigated. We have found that in the region 210 - 400 K the sample has the ferrimagnetic state with the Neel temperature (TN ~ 400 K) which is above the Curie temperature (TC ~ 262 K). In the paramagnetic region T = 410 - 650 K the effective magnetic moment is μeff = 8.78 μB, that points out the intermediate spin state (IS) of Co3+ ions.

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8

Abıshova, N. R. "ELECTRODEPOSITION OF COBALT FROM ALKALINE GLYCINE ELECTROLYTE." Azerbaijan Chemical Journal, no. 2 (June 2, 2022): 113–20. http://dx.doi.org/10.32737/0005-2531-2022-2-113-120.

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This article presents a study of the electrochemical reduction of cobalt ions from an alkaline glycine electrolyte by measuring cyclic and linear potentiodynamic polar curves. In the study, a cadmium salt (CoCl2) dissolved in a 1.5 M glycine solution was used as a source of cadmium ions and the pH of the electrolyte was adjusted to the required value by adding NH4OH to the solution. By taking cyclic pola-rized curves, the range of potentials at which the reduction of cobalt ions occurs was established. The effect of cobalt concentration and temperature on the reduction process of its ions from

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9

Perales, Oscar, Balachadran Jeyadevan, Kazuyuki Tohji, and Atsuo Kasuya. "Solution synthesis of monodispersed nanocrystalline FCC-, e- and HCP-Cobalt particles." TECNIA 13, no. 1 (2003): 47–53. http://dx.doi.org/10.21754/tecnia.v13i1.489.

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The systematic research of the "polyol process" applied to the production of metallic Cobalt particles is presented. In this approach, the control of the reaction kinetics and the metal particla size were achieved through a suitable selection of the solution chemistery in the ethylene glycol (EG)- or Trimethylene glycol (TMEG)-Cobalt (II) system. The adition of hydroxil ions into the Co solution in EG caused a dramatic shorteninig of the reaction time. This sortening in reaction time permited a convenient control of the size of sub-micron Co particles in reaction time with a highmonodispersity

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10

Villalobos, Javier, Diego González-Flores, Katharina Klingan, et al. "Structural and functional role of anions in electrochemical water oxidation probed by arsenate incorporation into cobalt-oxide materials." Physical Chemistry Chemical Physics 21, no. 23 (2019): 12485–93. http://dx.doi.org/10.1039/c9cp01754b.

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11

Eickner, Thomas, Sabine Illner, Niels Grabow, et al. "Manufacture and extraction of PLLA films with incorporated metal ions." Current Directions in Biomedical Engineering 9, no. 1 (2023): 451–54. http://dx.doi.org/10.1515/cdbme-2023-1113.

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Abstract For the in vitro examination of the effects on cells and tissues of metal ions derived from implants by wear and corrosion, a system is needed to release metal ions in a controlled and sustained manner. As small concentrations may have an impact on biological systems, a corresponding slow release over a defined period of time is necessary. Here, a manufacturing method of polymeric Poly(L-lactic acid) (PLLA) films with incorporated cobalt ions via dip coating is reported. The establishment of two analytical methods for the detection and quantification of cobalt ions is shown. High perf

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12

Sitole, Soyama, Mawethu Pascoe Bilibana, and Natasha Ross. "Electrochemical Performance of ZnCo2O4: Versatility in Applications." Journal of Composites Science 9, no. 3 (2025): 105. https://doi.org/10.3390/jcs9030105.

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Zinc cobaltite (ZnCo2O4) is a ternary metal oxide found in spinel with promising properties for various applications. Optimizing its catalytic activity requires an understanding of its electrochemical behavior. The electrochemical properties of ZnCo2O4 have significantly improved due to recent developments in nanostructuring, doping, surface modification, hybridization, structural engineering, and electrochemical activation. These improvements have inspired and motivated researchers by presenting the latest developments in the field. The spinel structure, coupled with the redox properties of c

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13

H., C. MALHOTRA, PRAKASH JAI, and CHAND SHARMA GIAN. "Kinetics and Mechanism of the Interaction of Cobalt(II) with L-Tyrosine." Journal of Indian Chemical Society Vol. 63, Dec 1986 (1986): 1045–48. https://doi.org/10.5281/zenodo.6276464.

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Department of Chemistry, University of Delhi, Delhi-110 007 <em>Manuscript received 14 July 1986, accepted 13 November 1986</em> The rate constants for the interaction of cobalt(II) with L-tyrosine have been obtained at 35 ±0.05° and at ionic strength 0.1 <em>M </em>(KNO<sub>2</sub>) using Aminco — Morrow stopped flow spectrophotometer. Study covered the pH range 6.10 — 6.90. Specific rate constants <em>k<sub>12</sub></em> k<sub>4 3</sub> and <em>k<sub>3 4</sub> k<sub>3 5</sub> </em>for the cobalt — tyrosine interaction have been determined. Mec

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14

Conklin, D. S., J. A. McMaster, M. R. Culbertson, and C. Kung. "COT1, a gene involved in cobalt accumulation in Saccharomyces cerevisiae." Molecular and Cellular Biology 12, no. 9 (1992): 3678–88. http://dx.doi.org/10.1128/mcb.12.9.3678-3688.1992.

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The COT1 gene of Saccharomyces cerevisiae has been isolated as a dosage-dependent suppressor of cobalt toxicity. Overexpression of the COT1 gene confers increased tolerance to cobalt and rhodium ions but not other divalent cations. Strains containing null alleles of COT1 are viable yet more sensitive to cobalt than are wild-type strains. Transcription of COT1 responds minimally to the extracellular cobalt concentration. Addition of cobalt ions to growth media results in a twofold increase in COT1 mRNA abundance. The gene encodes a 48-kDa protein which is found in mitochondrial membrane fractio

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15

Conklin, D. S., J. A. McMaster, M. R. Culbertson, and C. Kung. "COT1, a gene involved in cobalt accumulation in Saccharomyces cerevisiae." Molecular and Cellular Biology 12, no. 9 (1992): 3678–88. http://dx.doi.org/10.1128/mcb.12.9.3678.

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The COT1 gene of Saccharomyces cerevisiae has been isolated as a dosage-dependent suppressor of cobalt toxicity. Overexpression of the COT1 gene confers increased tolerance to cobalt and rhodium ions but not other divalent cations. Strains containing null alleles of COT1 are viable yet more sensitive to cobalt than are wild-type strains. Transcription of COT1 responds minimally to the extracellular cobalt concentration. Addition of cobalt ions to growth media results in a twofold increase in COT1 mRNA abundance. The gene encodes a 48-kDa protein which is found in mitochondrial membrane fractio

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16

Krotova, O. A., A. V. Kasperovich, I. V. Shulyak, Zh S. Shashok, E. E. Potapov, and S. V. Reznichenko. "The Modification of Silica Filler for Tyre Rubbers." International Polymer Science and Technology 44, no. 8 (2017): 21–24. http://dx.doi.org/10.1177/0307174x1704400804.

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A cobalt-ion-modified silica filler was produced that can be used as an adhesion promoter in elastomer composites intended for the rubber coating of metal cord. Electron scanning microscopy with energy dispersive analysis, X-ray fluorescence analysis (XFA), and IR spectroscopy were used to establish the qualitative and quantitative composition of the modified silica filler, and also its structure. The influence of the concentration of ammonia and of cobalt ions in the solution, the influence of the time for which the mixture is left to stand, and the influence of the amount of water used for w

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17

Jenkinson, Mark R. J., R. M. Dominic Meek, Rothwell Tate, Sandy MacMillan, M. Helen Grant, and Susan Currie. "Cobalt-induced cardiomyopathy – do circulating cobalt levels matter?" Bone & Joint Research 10, no. 6 (2021): 340–47. http://dx.doi.org/10.1302/2046-3758.106.bjr-2020-0414.r2.

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Elevated levels of circulating cobalt ions have been linked with a wide range of systemic complications including neurological, endocrine, and cardiovascular symptoms. Case reports of patients with elevated blood cobalt ions have described significant cardiovascular complications including cardiomyopathy. However, correlation between the actual level of circulating cobalt and extent of cardiovascular injury has not previously been performed. This review examines evidence from the literature for a link between elevated blood cobalt levels secondary to metal-on-metal (MoM) hip arthroplasties and

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18

Zhang, Dong. "Removal of Heavy Metal Ions from Water Using Nano-Barium Strontium Titanate Immobilized on the Silica Gel G as an Adsorbent." Applied Mechanics and Materials 71-78 (July 2011): 3500–3503. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3500.

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A new method based on the sorption of the nano-barium strontium titanate immobilized on the silica gel G(GBST) to heavy metal ions, included Mn(Ⅱ), Cu2+, Ni2+,Co2+and Ag+, in waste water. The effects of process parameters such as pH, contact time, regeneration conditions and the effects of common coexisting ions on the ions uptake were investigated. The results showed that the manganese, copper, nickel, cobalt and silver ions studied could be quantitatively retained at a pH value range of 7~9. The adsorption capacities of GBST for manganese, copper, nickel, cobalt and silver ions were found to

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19

Moravcová, Monika, Zuzana Lomozová, Radim Kučera, and Přemysl Mladěnka. "3-Hydroxyflavone is a mildly active and safe cobalt chelator while cobalt markedly enhances baicalein toxicity toward erythrocytes." RSC Advances 13, no. 42 (2023): 29242–51. http://dx.doi.org/10.1039/d3ra02735j.

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Flavonoids were screened for chelation of Co2+ ions. The most active, 3-hydroxyflavone and baicalein, as well as inactive quercetin were further tested (the cobalt-triggered Fenton chemistry and erythrocyte lysis in the presence of cobalt ions).

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20

Rudnik, Ewa, and Joanna Knapczyk-Korczak. "Preliminary investigations on hydrometallurgical treatment of spent Li-ion batteries." Metallurgical Research & Technology 116, no. 6 (2019): 603. http://dx.doi.org/10.1051/metal/2019008.

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The paper reports investigations of the direct recovery of copper and cobalt from sulphate solution after leaching of spent Li-ion cells. Metals of high purity (above 99%) can be selectively obtained if the electrolysis process is carried out at proper pH: 1 for Cu and 4 for Co. During cobalt electrowinning, the oxidation of Co(II) ions and formation of Co(III) compounds on the anode were observed. Lithium ions accumulated mainly in the electrolyte. Application of ammoniacal solution for selective lithium carbonate precipitation in the presence of cobalt ions was not effective due to high temp

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21

Jain, Richa, Bhumika Sehdev, Pratik Chaudhari, et al. "Pre and post-operative serum levels of titanium cobalt and aluminium after implant placement." Bioinformation 20, no. 6 (2024): 690–94. http://dx.doi.org/10.6026/973206300200690.

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The preoperative serum levels and postoperative serum levels of titanium, cobalt and aluminium from dental implants in order to assess the release of these ions and to assess any risk of toxicity from these ions after dental implant placement is of interest to dentists. It was observed that there was very slight increase in serum concentration of titanium, cobalt and aluminium after 12 months of placement of implants as compared to before placement of implants. However the increase was non-significant statistically. Our study concluded that the use of dental implants does not pose any risk of

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22

Ozerin, A. S., A. E. Mikhailyuk, F. S. Radchenko, and I. A. Novakov. "REGULARITIES OF SYNTHESIS OF COBALT PARTICLES DURING REDUCTION OF COBALT IONS IN THE PRESENCE OF POLY-N-VINYLPYRROLIDONE." IZVESTIA VOLGOGRAD STATE TECHNICAL UNIVERSITY, no. 12(247) (December 24, 2020): 130–36. http://dx.doi.org/10.35211/1990-5297-2020-12-247-130-136.

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The reduction of cobalt ions in the presence of poly-N-vinylpyrrolidone in aqueous solutions has been studied by spectrophotometric analysis, scanning electron microscopy, and transmission electron microscopy. It was shown that at the initial stage of the reduction of cobalt ions, the formation of metal particles of cobalt with a size of 2-5 nm occurs. A day later, aggregates of 28-45 nm in size are formed, which are a mixture of metallic cobalt, its oxide and hydroxide.

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23

Zhou, Jing-Ru, Da-Peng Liu, Yue He, et al. "A highly selective colorimetric chemosensor for cobalt(ii) ions based on a tripodal amide ligand." Dalton Trans. 43, no. 30 (2014): 11579–86. http://dx.doi.org/10.1039/c4dt00776j.

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A highly selective colorimetric chemosensor for cobalt(ii) ions was synthesized and structurally characterized by single crystal X-ray diffraction. The ligand enabled the detection of cobalt(ii) ions at a concentration of 10<sup>−5</sup> mol L<sup>−1</sup> by the “naked-eye”.

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24

Begishev, E. M., I. R. Vakhitov, N. M. Lyadov, et al. "Ferromagnetism and two magnetic phases in rutile (TiO<sub>2</sub>) implanted with cobalt ions: effect of substrate temperature and orientation." Известия Российской академии наук. Серия физическая 87, no. 3 (2023): 450–56. http://dx.doi.org/10.31857/s036767652270082x.

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Room-temperature ferromagnetism and two magnetic phases: cobalt metal nanoparticles and a solid solution of divalent cobalt ions have been observed in single-crystal rutile (TiO2) implanted with cobalt ions to high dose level. Here we present the results of our structural and magnetic studies showing an influence both the temperature and the orientation of TiO2 substrate during a cobalt ion implantation, as well the effect of post-implantation thermal annealing (in air or in vacuum) on ferromagnetism value and magnetic phase composition of Co-implanted rutile.

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25

Malyshev, Victor, Angelina Gab, Arvydas Survila, et al. "Electroplating of Co-W and Co-Mo Alloys from Na2WO4 Ionic Melts." Revista de Chimie 70, no. 3 (2019): 871–74. http://dx.doi.org/10.37358/rc.19.3.7023.

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The cathodic reduction processes of cobalt (II), tungsten (VI) and molybdenum (VI) in Na2WO4 melts are discussed. Electrochemical behavior of cobalt in a tungstate melt, as well as the effect of electrolysis conditions on the composition and structure of Co-W and Co-Mo alloys deposits from tungstate-molybdate melts is also studied. With a decrease in the concentration of cobalt ions and an increase in the concentration of molybdenum (tungsten) ions in the melt, the phase composition of cathodic deposits is shown to change from individual cobalt to individual molybdenum (tungsten) via a series

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26

Kawamura, Y., J. Yamauchi, and N. Azuma. "Molecular and Crystal Structure of the Complex Composed of 2,3,5-Triphenyltetrazolium Cation and Dichloro-(1,3,5-triphenylformazanato)cobaltate(II) Anion." Acta Crystallographica Section B Structural Science 53, no. 3 (1997): 451–56. http://dx.doi.org/10.1107/s0108768196015960.

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The molecular and crystal structure of, cobalt(II) complex prepared by the reaction of 1,3,5-triphenylformazan with cobalt dichloride, 2,3,5-triphenyltetrazolium dichloro(1,3,5-triphenylformazanato)cobaltate(II), has been determined by means of X-ray diffraction. The complex crystallized in a triclinic space group P\overline 1, with M r = 728.55, a = 10.214 (3), b = 18.208 (7), c = 9.985 (2) Å, \alpha = 96.44 (3), \beta = 107.92 (2), \gamma = 81.79 (3)°, Z = 2, D x = 1.387 Mg m−3, \mu = 0.683 mm−1, F(000) = 750, R = 0.041, wR = 0.040 and S = 1.40. The complex is composed of a pair of ions, the

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27

Inatova, Makhsuda Sagdullaevna, and Zulayho Asanalievna Smanova. "IMMOBILIZED REAGENTS BASED ON NITROSONAPHTHOL DERIVATIVES FOR THE DETERMINATION OF METAL IONS." EURASIAN JOURNAL OF MEDICAL AND NATURAL SCIENCES 2, no. 2 (2022): 82–86. https://doi.org/10.5281/zenodo.6258013.

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New organic reagents based on nitrosonaphthols have been synthesized and they have been proposed as analytical reagents for cobalt ions. The immobilization of the reagents has been carried out, their kinetics have been studied, and the optimal conditions for the immobilization and complex formation of cobalt ions have been found.

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28

Trindade, Ana C. V., Sónia I. G. Fangaia, Pedro M. G. Nicolau, et al. "Transport Properties of Carbohydrates: Towards the Minimization Toxicological Risks of Cobalt and Chromium Ions." Processes 11, no. 6 (2023): 1701. http://dx.doi.org/10.3390/pr11061701.

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The influence of oligosaccharides (α-cyclodextrin, β-cyclodextrin and γ-cyclodextrin), and a polysaccharide, sodium hyaluronate (NaHy), on the diffusion of aqueous solutions of cobalt and chromium chlorides has been investigated. Cobalt and chromium are constituents of metal alloys for biomedical use, including dental prostheses. Thus, the release of these ions in the human body can lead to harmful biological effects. The interaction of metal ions with saccharides might have information on the role of mouthwashes in preventing these effects. This interaction has been assessed by measuring mult

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29

Lin, Shengnan, Xijuan Pan, Deliang Meng, and Tingan Zhang. "Electric conversion treatment of cobalt-containing wastewater." Water Science and Technology 83, no. 8 (2021): 1973–86. http://dx.doi.org/10.2166/wst.2021.101.

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Abstract Long-term accumulation of cobalt-containing wastewater may also pollute groundwater and cause a large amount of loss of valuable metals. Therefore, the comprehensive utilization of cobalt-containing wastewater must be realized, especially as cobalt itself is a very important strategic resource. This paper proposes a membrane electroconversion method to separate cobalt ions from cobalt-containing wastewater and prepare cobalt hydroxide. In addition, the electrolysis process was optimized, and single-factor experiments such as the initial concentration, cobalt ions, current density, tem

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30

Bin Bandar, Khaled, and Saad Aljlil. "Utilization of Prepared Nanocellulose as a Biopolymer for Adsorption Kinetics of Cobalt Ions from Wastewater." Polymers 15, no. 9 (2023): 2143. http://dx.doi.org/10.3390/polym15092143.

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This study evaluated nanocellulose derived from discarded palm leaves for its ability to remove cobalt ions from industrial wastewater. The process involved extracting cellulose nanocrystals (CNCs) from date palm leaves through a series of repeated chemical treatments. The study examined the adsorption rates of cobalt ions under various conditions using different techniques. Two equilibrium models, the Langmuir and Freundlich models, were employed, and the Langmuir model was found to be consistent with the experimental data. The maximum amount of cobalt ions adsorbed at room temperature was 5.

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Frunze, O. V. "Woody and shrub plant phytoremediation of soils contaminated with heavy metal ions." Forestry Bulletin 26, no. 6 (2022): 92–98. http://dx.doi.org/10.18698/2542-1468-2022-6-92-98.

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The use of woody and shrubby plants with a developed root system and a large biomass in the technology of phytoremediation of soils contaminated with heavy metals is analyzed. Woody plants can be used in the process of phyto-recovery of urban systems as long-term absorbers of heavy metal ions from the soil. The main mechanisms of phytoremediation of contaminated urban areas with the help of trees and shrubs are considered. The sorption capacity of cobalt, manganese and chromium ions by some species of woody and shrubby plants has been studied. The accumulation of heavy metals by seedlings unde

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32

Shen, Bowen, Bixuan Wang, Liying Zhu, and Ling Jiang. "Properties of Cobalt- and Nickel-Doped Zif-8 Framework Materials and Their Application in Heavy-Metal Removal from Wastewater." Nanomaterials 10, no. 9 (2020): 1636. http://dx.doi.org/10.3390/nano10091636.

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Heterometallic zeolite imidazole framework materials (ZIF) exhibit highly attractive properties and have drawn increased attention. In this study, a petal-like zinc based ZIF-8 crystal and materials doped with cobalt and nickel ions were efficiently prepared in an aqueous solution at room temperature. It was observed that doped cobalt and nickel had obviously different effects on the morphology of ZIF-8. Cobalt ions were beneficial for the formation of ZIF-8, while addition of nickel ions tended to destroy the original configuration. Then we compared the absorption ability for metal ions betwe

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33

Pokutsa, Oleksandr, Andriy Zaborovskiy, Daria Maksym, Roman Makitra, Jacques Muzart, and Andrzej Sobkowiak. "The influence of the reaction medium on the cleavage of hydrogen peroxide catalyzed with cobalt ions." Chemistry & Chemical Technology 2, no. 2 (2008): 71–75. http://dx.doi.org/10.23939/chcht02.02.071.

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The peculiarity of H2O2 cleavage catalyzed with cobalt(II)acetylacetonate has been studied by the method of inhibitors in different hydrophilic solvents. As established, physical-chemical properties of reaction medium can significantly affect the rate of peroxide decomposition and catalyst oxidation as well.

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34

Nikovskii, I. A., K. M. Karnaukh, T. M. Aliev, et al. "Template Synthesis of the Trinuclear Cobalt(III) Complex with Diarylimidazole-Based Ligands: Synthesis and Properties." Координационная химия 49, no. 6 (2023): 360–66. http://dx.doi.org/10.31857/s0132344x23700238.

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The trinuclear cobalt(III) complex [(Bipy)5Co3(L)2](Cl)3 (I) is synthesized by the template reaction of 2,2'-(1H-imidazole-4,5-diyl)bis(4-ethylphenol) (L) and bis(2,2-bipyridine)cobalt(II) dichloride in the presence of diazabicycloundecene. The complex is isolated in the individual state and characterized by elemental analysis, cyclic voltammetry, UV-VIS spectroscopy, and X-ray diffraction (XRD) (CIF file СCDC no. 2201135). According to the obtained data, the cobalt ions in trinuclear complex I have the oxidation state +3, and the complex formation occurs with the oxidation of the initial coba

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Shakerian, Khoo, and Hossein Esmaeili. "Synthesis of CaO/Fe3O4 magnetic composite for the removal of Pb(II) and Co(II) from synthetic wastewater." Journal of the Serbian Chemical Society 83, no. 2 (2018): 237–49. http://dx.doi.org/10.2298/jsc170704098s.

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In this study, CaO was prepared from chicken egg shells. Then, to improve its properties, CaO/Fe3O4 magnetic composite was synthesized and was used for the removal of lead (Pb (II)) and cobalt (Co (II)) ions from aqueous solutions. For this purpose, the effects of several parameters including pH, contact time, temperature, adsorption dosage and initial concentration of ions on the adsorption were studied. The optimum conditions of pH, contact time, temperature, adsorption dosage and initial concentration of Pb and Co ions were determined to be 6, 30 min, 25 ?C, 2 g L-1 and 5 mg L-1, respective

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Gaur, Sunita, Renu Joshi, and Aresh Vikram Singh. "Preparation of GBSA (Guargum 1-butane sulphonic acid) Resin and Study of Their Physicochemical Characterization and Use for Removal of Toxic metal from Effluents." Oriental Journal Of Chemistry 39, no. 5 (2023): 1226–31. http://dx.doi.org/10.13005/ojc/390515.

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The adsorption behavior of a functional group 1-butane sulphonic acid, is used for synthesis of the natural resin based on guar gum is GBSA resin. Many hazardous metal ions have been studied utilizing batch method and column separation experiment. The Gaur gum-based resin (GBSA) was evaluated based on its bulk density, FTIR spectra, and ion exchange capability. The hazardous metal ions have been removed from industrial effluents using GBSA resin. The resin utilized to remove iron and cobalt metal from contaminated water using GBSA resin. Iron metal ions show maximum adsorption on GBSA resin at

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Gavris, Georgeta, Oana Stanasel, Rodica Pode, Marcela Stoia, and Virgil Chitac. "Study upon the Recuperative Purging of Nickel and Cobalt Ions from Residual Solutions by Means of Chemical Precipitation." Revista de Chimie 59, no. 1 (2008): 61–64. http://dx.doi.org/10.37358/rc.08.1.1708.

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The study introduces a cleaning method of waste waters with nickel and cobalt ions content, by the precipitation of these ions as oxalates. The aim of the study is to establish the optimum conditions for a high degree of a metal recovery like nickel oxalate or cobalt oxalate, due to the low value of their products of solubility. The parameters studied were: pH, excess of reactant reagents, concentration of ions and temperature. The crystalline form of the obtained products corresponds to: NiC2O4�2H2O and CoC2O4�2H2O and extraction degree of metals was around 99%.

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Shah, Ambreen, Fayyaz Ahmed Keerio, Saima Qayyum Memon, and Ghulam Zuhra Memon. "Cloud Point Extraction for the Determination of Different Metal Ions by Using Bis(2-Acetyl Pyridine 4-Phenyl 3-Thiosemicarbazone) as Complexing Reagent." Pakistan Journal of Scientific & Industrial Research Series A: Physical Sciences 62, no. 2 (2019): 76–81. http://dx.doi.org/10.52763/pjsir.phys.sci.62.2.2019.76.81.

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A new method of cloud point extraction was determined for preconcentration and determination of different metal ions like copper(II), nickel(II) and cobalt(II) ions. The complexation has been done by bis(2-acetyl pyridine 4-phenyl 3-thiosemicarbazone) (APPT) using sodium dodecyl sulphate (SDS) as surfactant. Metal ions are extracted into the phase rich in SDS after centrifugation. Initially, micellar phase was dissolved in 10 mL of deionized water then acidified with 0.5 mol/L HNO3, enhanced the surfactant- rich phase and analyzed by flame atomic absorption spectrometry (FAAS). The effects of

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Xia, Yan, and Zhiliang Huang. "Oxidation/cobalt ion-exchange method to improve biotite electrochemical properties." Journal of Physics: Conference Series 2351, no. 1 (2022): 012001. http://dx.doi.org/10.1088/1742-6596/2351/1/012001.

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We prepared a hydrated mica mineral material with larger layer spacing by oxidized/cobalt ion exchange. The structural evolution during the modification and the electrochemical properties of the final obtained hydrated Co-mica were investigated. Results showed that the layer spacing of black mica increased, and the electrochemical properties were enhanced. In the oxidation environment, the divalent iron ions in the octahedral layer of black mica are oxidized. The potassium ions bound by Coulomb force in the black mica layer structure can be detached cobalt ions support the large layer spacing

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Ye, Ming Quan, Ai Jun Han, Zhu Bo Liu, and Chen Wang. "Metal Ions Doped Complex Cobalt Blue Pigment Research." Advanced Materials Research 415-417 (December 2011): 194–99. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.194.

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Metal ions doped complex cobalt blue pigments are prepared by homogeneous precipitation, to investigate the effects of doping ions Zn2+，Mg2+，Ni2+and Y3+on some properties of the doped complex cobalt blue pigments, such as crystal structure, color, shading power and temperature resistance. Studies have shown that doping have little effect on the spinel crystal type and temperature resistance of the pigments ; ionic radius differences between doping ions and Co2 +cause lattice distortion and changes of lattice constant , thus affecting the ligand state spaces of Co2 +ion, color and shading power

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Ковехова (Kovekhova), Анна (Anna) Васильевна (Vasil'yevna), Ольга (Ol'ga) Дмитриевна (Dmitriyevna) Арефьева (Aref'eva), Наталья (Natal'ya) Викторовна (Viktorovna) Макаренко (Makarenko), Людмила (Lyudmila) Алексевена (Alekseyevna) Земнухова (Zemnukhova), and Елена (Elena) Викторовна (Viktorovna) Ковалева (Kovalyova). "REMOVAL OF IONS OF Al3+ AND Co2+ PHOSPHORUS-CONTAINING PRODUCT FROM THE BRAN." chemistry of plant raw material, no. 4 (April 18, 2018): 281–88. http://dx.doi.org/10.14258/jcprm.2018043761.

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The process of removal aluminum and cobalt ions from aqueous solutions with a phosphorus-containing product containing inositol hexaphosphoric acid derivatives obtained from rice production wastes of Far Eastern selection varieties – rice flour, and optimal conditions were determined. It is established that the efficiency of removal of metal cations by the phosphorus-containing product depends not only on their nature, but also on the initial concentration of ions in solutions. The degree of extraction of aluminum ions reaches 99%, and cobalt – 76%. The principal possibility of using phosphoru

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Jumekeeva, A., E. Talgatov, A. Ismailova, A. Auezkhanova, A. Naizabayev, and A. Abilmagzhanov. "STUDY OF THE COMPLEXATION OF COBALT (II) IONS WITH POLYMERS." Chemical Journal of Kazakhstan, no. 1 (March 27, 2025): 140–49. https://doi.org/10.51580/2025-1.2710-1185.14.

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The complex formation of metal ions with polymers is of great interest for the development of new materials used in catalytic processes, sorption, and electrochemistry. Particular attention is given to cobalt (II), which can form complexes with nitrogen- and oxygen-containing polymers such as polyacrylic acid (PAA), polyacrylamide (PAAm), chitosan (Chit), and poly-4-vinylpyridine (P4VP). The aim of this study is to investigate the complexation processes of cobalt (II) ions with the functional groups of these polymers, as well as to determine the stability and nature of the resulting complexes.

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Zhou, Fengbo, Ammar Oad, Hongqiu Zhu, and Changgeng Li. "Quantitative Analysis of Polymetallic Ions in Industrial Wastewater Based on Ultraviolet-Visible Spectroscopy." Sustainability 13, no. 14 (2021): 7907. http://dx.doi.org/10.3390/su13147907.

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In order to detect and control the concentration of polymetallic ions in industrial wastewater in real time, a spectrophotometric method combining wavelet transform (WT) and partial least squares regression (PLSR) is proposed for the simultaneous determination of zinc, cobalt and nickel in industrial wastewater by ultraviolet-visible spectrometry, without a separation step. WT was found to be suitable for spectral preprocessing, which effectively eliminated the noise, enhanced spectral feature information, improved the linearity of the detected ions and increased the number of selectable model

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Mesilov, V. V., V. R. Galakhov, B. A. Gizhevskii, et al. "Charge states of cobalt ions in nanostructured lithium cobaltite: X-ray absorption and photoelectron spectra." Physics of the Solid State 55, no. 5 (2013): 943–48. http://dx.doi.org/10.1134/s1063783413050247.

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Matveichuk, Yulya V., and Evgeniy M. Rakhman’ko. "THIOCYANATE COMPLEXES OF d-METALS: INFLUENCE OF CONCENTRATION OF KNCS AND NH4Cl ON A TYPE OF COORDINATION OF SCN-IONS BY FTIR SPECTROMETRY." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 60, no. 7 (2017): 34. http://dx.doi.org/10.6060/tcct.2017607.5553.

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By IR spectrometry thiocyanates aqueous solutions of divalent cations of cadmium, mercury, nickel, manganese, iron, zinc and cobalt were studied. It was found that cadmium (II), mercury (II), nickel (II), iron (II) thiocyanate ions coordinated by type thiocyanate, zinc (II) − according to the type isothiocyanate; cobalt (II) and manganese (II) coordination mode change depending on the concentration of potassium thiocyanate in a solution. These results are consistent with the theory of hard and soft acids and bases. Co2+ ions are intermediate acids, so they can coordinate with SCN− into two typ

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Сиколенко, В. В., И. О. Троянчук, Д. В. Карпинский та ін. "Исследование спинового перехода в монокристалле LaCoO-=SUB=-3-=/SUB=- методом рентгеновского магнитного кругового дихроизма на K- и L-=SUB=-2,3-=/SUB=--краях кобальта". Физика твердого тела 60, № 2 (2018): 283. http://dx.doi.org/10.21883/ftt.2018.02.45382.204.

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AbstractSpin transitions of cobalt ions in LaCoO_3 single crystals have been studied by the method of X-ray magnetic circular dichroism (XMCD) at the K - and L _2,3-edges of Co^3+ ions. The orbital momentum of cobalt ions obtained for the K -edge at the 3 d level in the region of the spin transition in the temperature range from 25 to 120 K increases by a factor of approximately 1.6, whereas the slope of the magnetization curve value in the same temperature range and magnetic field increases by a factor of more than 10. XMCD experiments at the cobalt L _2,3-edges demonstrate gradual growth of

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Cerc Korošec, Romana, Polona Umek, Alexandre Gloter, Jana Padežnik Gomilšek та Peter Bukovec. "Structural properties and thermal stability of cobalt- and chromium-doped α-MnO2 nanorods". Beilstein Journal of Nanotechnology 8 (10 травня 2017): 1032–42. http://dx.doi.org/10.3762/bjnano.8.104.

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α-MnO2 nanorods were synthesized via the hydrothermal decomposition of KMnO4 in an acidic environment in the presence of Co2+ and Cr3+ ions. Reactions were carried out at three different temperatures: 90, 130 and 170 °C. All prepared samples exhibit a tetragonal MnO2 crystalline phase. SEM–EDS analysis shows that cobalt cations are incorporated to a higher degree into the MnO2 framework than chromium ions, and that the content of the dopant ions decreases with increasing reaction temperature. The oxidation of Co2+ to Co3+ during the reaction was proved by an XANES study, while EXAFS results co

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Liu, CunPing. "Removal of Cobalt (II) Ions from Aqueous Solution on Zinc(II) Ions Doping Chitosan/Hydroxyapatite Composite." Advanced Composites Letters 22, no. 6 (2013): 096369351302200. http://dx.doi.org/10.1177/096369351302200603.

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In the present investigation, bio-inorganic composite, which was synthesized with chitosan and hydroxyapatite by adding zinc(II) ions, have been prepared by precipitation method and was characterized by Fourier Transform infrared (FTIR) spectroscopy and energy dispersive X-ray analyzer (EDXA). Then, the composite was used for removal of Cobalt(II) from synthetic aqueous solution. The effects of initial pH, contact time, kinetic and isothermal adsorption were studied in detail using batch adsorption at different temperature. The results showed that Cobalt(II) ions can be efficiently removed and

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Zabiszak, Michał, Justyna Frymark, Martyna Nowak, et al. "Influence of d-Electron Divalent Metal Ions in Complex Formation with L-Tartaric and L-Malic Acids." Molecules 26, no. 17 (2021): 5290. http://dx.doi.org/10.3390/molecules26175290.

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Binary complexes of α-hydroxy acids (L-Tartaric acid and L-Malic acid) with d-electron metal ions (copper, cobalt, nickel) were investigated. Potentiometric measurements have been performed in aqueous solution with computer analysis of the data for determination of the stability constants of complexes formed in the studied systems. The coordination mode of the complexes was defined using spectroscopic methods: electron paramagnetic resonance (EPR), ultraviolet-visible (UV-Vis), circular dichroism (CD), and infrared (IR). Results of the equilibrium studies have provided evidence for the formati

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Nangah, C. R., T. G. Merlain, N. J. Nsami, C. P. Tubwoh, K. J. Mbadcam, and D. Dodoo-Arhin. "Synthesis and Characterization of Goethite Nanostructured powder: Application in the Simultaneous Removal of Co(II) and Ni(II) Ions from Aqueous Solution." MRS Advances 3, no. 42-43 (2018): 2675–87. http://dx.doi.org/10.1557/adv.2018.527.

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Abstract:This study investigates the adsorption efficiency of goethite nanostructured powder for the simultaneous removal of cobalt and nickel ions. The nanostructured powder sample was synthesized via a chemical precipitation technique and characterized using SEM, FTIR-ATR and XRD techniques. From batch adsorption studies, maximum absorption for Co(II) and Ni(II) ions occurred at an equilibrium contact time of 80 min, with an adsorbent mass of 0.1 g, and at pH=7. Co(II) ions showed greater affinity to the nanoparticles as compared to Ni(II). The maximum quantities adsorbed were recorded as 14

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