Adsorption Of A Copper (ii) Complex On Calcium Phosphate Intercalated With 4-aminobenzoic Acid -synthesis And Electrochemical Investigation

In this study, the adsorption isotherm of copper (II) on a calcium phosphate host intercalated with 4-aminobenzoic acid in an ethanol solution was investigated. This gave a maximum adsorption capacity of 1.74 mmol g -1. The material was incorporated into a carbon-paste electrode, and its electrochemical properties were investigated. However, for a dopamine solution, the anodic peak current increased owing to the electrocatalytic oxidation. The electrode presented the same response for at least 150 successive measurements, showing good repeatability. The modified electrode is very stable and reproducible. The electrode sensor was successfully applied for dopamine determination in pharmaceutical preparations.36811701175Song, S., Clark, R.A., Bowden, E.F., Taylor, M.J., (1993) J. Phys. Chem., 97, p. 6564Edmonds, T., (1988) Chemical Sensors, , Blackie: GlasgowYabuki, S., Mizutani, F., Asai, M., (1991) Biosens. 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Adsorption And Structure Of Metal Ion Complexes With Piperazine Groups Grafted On Silica Gel Surface

Silica gel, chemically modified with piperazine [Si(CH2)3N(CH2CH2)2)NH], abbreviated as SiP, was used to adsorb metal ions from ethanol solutions. The adsorption capacity was for each metal (in mmol g-1): Co(II) = 0.44, Ni(II) = 0.37, Cu(II) = 0.74, Zn(II) = 0.28, Cd(II) = 0.46, and Hg(II) = 0.51. The electronic spectra of MCl2 [M(II) = Co and Cu], adsorbed on SiP, indicate that one metal ion is coordinated to two free amines and the other adsorbed metal ion is coordinated exclusively with Cl- ions. Presumably for other metal ions, the coordination scheme is similar. The protonated organofunctionalized silica, abbreviated as SiPH+Cl-, was also used to adsorb the above metal ions, except Ni(II), from ethanol solutions. It was possible to conclude from the adsorption isotherms that the structure of the adsorbed metal ions can in every case be represented as (SiPH+)nMClz+n n-. © 1991.142197102Zaitsev, Trofimchuk, (1984) Sov. Prog. Chem., 50, p. 5Alimarin, Nesterenko, Ivanov, (1984) Dokl. Akad. Nauk SSSR, 271, p. 234Gushikem, Moreira, (1985) J. Colloid Interface Sci., 107, p. 70Gushikem, da Silva, (1985) J. Colloid Interface Sci., 107, p. 81Airoldi, Alcantara, (1989) Colloids Surf., 39, p. 291Filippov, Zyatkovskii, Karpenko, Stepwise formation of copper(II) complexes with aminopropyl groups fixed on the surface of aerosil (1981) Theoretical and Experimental Chemistry, 17, p. 278Skopenko, Trofimchuk, Zaitsev, (1982) Russ. J. Inorg. Chem., 27, p. 1458Murthy, Quagliano, Vallarino, (1972) Inorg. Chim. Acta, 6, p. 49Marcotrigiano, Menabue, Pellacani, STUDY ON THE PSEUDOTETRAHEDRAL AND TETRAHEDRAL COBALT(II) COMPLEXES (1977) Journal of Coordination Chemistry, 7, p. 1Singh, Mitra, Thermal investigation and stereochemical studies of some cyclic diamine complexes of nickel(II), zinc(II), and cadmium(II) in the solid state (1987) Journal of the Chemical Society, Dalton Transactions, p. 2089Carpino, Mansour, Knapczyk, (1983) J. Org. Chem., 48, p. 666Brunauer, Emmett, Teller, (1938) J. Amer. Chem. Soc., 60, p. 309Kubota, Moreira, Gushikem, Adsorption of metal ions from ethanol on an iminosalicyl-modified silica gel (1989) The Analyst, 114, p. 1383Gushikem, Iamamoto, (1990) J. Colloid Interface Sci., 134, p. 275Scarrow, Griffiths, (1967) J. Chem. Soc. Chem. Commun., 425Gushikem, Moreira, (1987) Colloids Surf., 25, p. 155Jørgensen, (1962) Absorption Spectra and Chemical Bonding in Complexes, , Pergamon, Londo

Electrochemical Properties Of The Hexacyanoferrate(ii)-ruthenium(iii) Complex Immobilized On Silica Gel Surface Chemically Modified With Zirconium(iv) Oxide

The chemically modified silica gel with zirconium(IV) oxide was used to immobilize the [Fe(CN)6]4- complex ion initially. The reaction of this material with [Ru(edta)H2O]- complex ion formed the immobilized cyano-bridged mixed valence ruthenium complex, (Zr) 5[(edta)RuNCFe(CN)5]. This material was incorporated into a carbon paste electrode and, its electrochemical properties were investigated. However, for an ascorbic acid solution, an enhancement of the anodic peak current was detected due to electrocatalytic oxidation. The electrode presented the same response for at least 150 successive measurements, with a good repeatability. The modified electrode is very stable and reproducible. The sensor was applied for ascorbic acid determination in pharmaceutical preparation with success. © 2014 Elsevier Ltd. All right sreserved.1887883Kubota, L.T., Gouveia, F., Andrade, A.N., Milagres, B.G., Oliveira Neto, G., (1996) Electrochim. Acta, 41, pp. 1465-1469Lazarin, A.M., Airoldi, C., (2008) Solid State Sci., 10, pp. 1139-1144Azevedo, C.M.N., Araki, K., Angnes, L., Toma, H.E., (1998) Electroanalysis, 10, pp. 467-471Borgo, C.A., Ferrari, R.T., Colpini, L.M.S., Costa, C.M.M., Baesso, M.L., Bento, A.C., (1999) Anal. Chim. Acta, 385, pp. 103-109Gushikem, Y., Peixoto, C.R.M., Rodrigues Filho, U.P., Kubota, L.T., Stlader, E., (1996) J. Colloid Interface Sci., 184, pp. 236-240Sophia, S.J., Davi, S., Pandian, K., (2012) Int. J. Electrochem. Sci., 7, pp. 6580-6598Karimi-Maleh, H., Ensafi, A.A., Ensafi, H.R., (2009) J. Braz. Chem. Soc., 20, pp. 880-887Lazarin, A.M., Sernaglia, R.L., Andreotti, E.I.S., Silva, C.F.N., Dias, A.P.B., Santana, A.P.R., Pizzo, J.S., Airoldi, C., (2013) Quim. Nova, 36, pp. 1170-1175Perez, E.F., Oliveira Netto, G., Tanaka, A.A., Kubota, L.T., (1998) Electroanalysis, 10, pp. 111-115Zen, J., Tang, T., (1995) Anal. Chem., 67, pp. 208-211Andreotti, E.I.S., Gushikem, Y., Kubota, L.T., (1992) J. Braz. Chem. Soc., 3, pp. 21-24Matsubara, T., Creutz, C., (1979) Inorg. Chem., 18, pp. 1956-1966Bajaj, H.C., Van Eldik, R., (1990) Inorg. Chem., 29, pp. 2855-2858Kalyanasundaram, K., Grãtzel, M., Nazeeruddin, M.D.K., (1992) Inorg. Chem., 31, pp. 5243-5253Bignozzi, C.A., Argazzi, R., Chiorboli, C., Sofia, S., Scandola, F., (1991) Coord. Chem. Rev., 111, pp. 261-266Costa, W.M., Cardoso, W.S., Marques, E.P., Bezerra, C.W.B., Ferreira, A.A.P., Song, C., Zhang, J., Marques, A.L.B., (2013) J. Braz. Chem. Soc., 24, pp. 529-533Chakraborty, S., Pramanik, N., (2013) Res. J. Chem. Sci., 3, pp. 31-34Mukaida, M., Okuno, H., Ishimori, T., (1965) Nippon Kagaku Zasshi, 86, pp. 598-600Filipov, A.P., Karpenko, G.A., (1978) Theor. Exp. Chem., 14, pp. 333-336Alfaya, R.V.S., Gushikem, Y., Alfaya, A.A.S., (2000) J. Braz. Chem. Soc., 11, pp. 281-285Veselý, V., Pekárek, V., (1972) Talanta, 19, pp. 219-262Cunha, L.J.V., Andreotti, E.I.S., Gushikem, Y., (1995) J. Braz. Chem. Soc., 6, pp. 271-276Chatterjee, D., Bajaj, H., Das, A., (1993) Inorg. Chem., 32, pp. 4049-4052Ballausen, C.J., (1962) Introduction to Ligand Field Theory, p. 253. , McGraw-Hill Book Company New YorkBard, A.J., Faulkner, L.R., (1980) Electrochemical Methods, Fundamentals and Applications, p. 218. , Wiley & Sons New YorkKubota, L.T., Gushikem, Y., Perez, J., Tanaka, A.A., (1995) Langmuir, 11, pp. 1009-1013Ju, H., Gong, Y., Zhu, H., (2001) Anal. Sci., 17, pp. 59-63Arya, S.P., Mahajan, M., (1995) Anal. Sci., 11, pp. 853-855Adekunle, A.S., Oluwafemi, O.S., Ncapayi, V., Sadiku, R.E., Agee, J.T., Ojo, S.O., Songca, S.P., (2012) Int. J. Electrochem. Sci., 7, pp. 2695-2709Kim, Y.-R., Bong, S., Kong, Y.-J., Yan, Y., Marajan, R.K., Seung, K., Kim, H., (2010) Biosens. Bioelectron., 25, pp. 2366-2369Keeley, G.P., O'Neill, A., McEvoy, N., Peltekis, N., Coleman, J.N., Duesberq, G.S., (2010) J. Mater. Chem., 20, pp. 7864-7869Freed, M., (1966) Methods of Vitamin Assay, , third ed. Interscience New Yor

Thermodynamics Of The Nickel, Cobalt And Zinc Removal From Ethanolic Solution By P-aminobenzoic Acid Intercalated On Layered Calcium Phosphate

Crystalline lamellar calcium phosphate retained p-aminobenzoic acid inside its cavity without leaching. The adsorption isotherms from ethanol gave the maximum adsorption capacities of 6.44, 3.34 and 1.62 mmol g-1 for nickel, cobalt and zinc, respectively. The energetic effects caused by metallic cation interactions were determined through calorimetric titration at the solid/liquid interface and gave a net thermal effect that enabled enthalpy and equilibrium constant calculations. 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