1,721,586 research outputs found
Calorimetric Investigation Of Metal Ion Adsorption On 3- Glycidoxypropyltrimethylsiloxane + Propane-1,3-diamine Immobilized On Silica Gel
No full textThe silylant precursor agent 3-glycidoxypropyltrimethoxysilane was covalently anchored onto a silica gel surface followed by propane-1,3-diamine molecule incorporation using a heterogeneous route (SiHT). On another series, the precursor agent was previously reacted with diamine to give the silylant agent in homogeneous condition, before immobilization (SiHM). The degrees of immobilization were 0.80 and 1.53 mmol g-1 for SiHT and SiHM, respectively. Both grafting surfaces were employed to extract the divalent cations nickel, copper, cobalt and zinc from aqueous solutions. This cation/nitrogen interactive process was calorimetrically followed to give exothermic enthalpy, negative free Gibbs energy and positive entropy values. These favorable thermodynamic data are more pronounced for copper on both surfaces, with a higher tendency for SiHM, due to the larger amount of available nitrogen atoms in the pendant chain covalently attached to the inorganic silica backbone. © 2004 Elsevier B.V. All rights reserved.4271-27783Wilson, K., Clark, J.H., (2000) Pure Appl. Chem., 72, p. 1313Clark, J.H., MacQuarrie, D.J., (1998) Chem. Comm., 8, p. 853Deschler, U., Kleinschmit, P., Panster, P., (1986) Angew. Chem. Int. Ed. Engl., 25, p. 236Airoldi, C., Arakaki, L.N.H., (2002) J. Colloid Interface Sci., 249, p. 1Valkenberg, H.M., Hölderich, W.F., (2002) Catal. Rev., 44, p. 321Ribeiro, E.S., Rosatto, S.S., Gushikem, Y., Kubota, L.T., (2003) J. Solid State Electrochem., 7, p. 665Silva, C.R., Jardim, I.C.S.F., Airoldi, C., (2003) J. Chromatogr. a, 987, p. 139Silva, C.R., Jardim, I.C.S.F., Airoldi, C., (2001) J. Sep. Sci., 24, p. 197Bresson, C., Menu, M.J., Dartiguenave, M., Dartiguenave, Y., (2000) J. Environ. Monit., 2, p. 240Arakaki, L.N.H., Augusto, V.L.S., Espinola, J.G.P., Fonseca, M.G., Oliveira, S.F., Arakaki, T., Airoldi, C., (2003) J. Environ. Monit., 5, p. 366Sales, J.A.A., Prado, A.G.S., Airoldi, C., (2002) J. Therm. Anal. Calorim., 70, p. 135Bernal, J.P., Rodriguez De San Miguel, E., Aguilar, J.C., Salazar, G., Gyves, J., (2000) Sep. Sci. Technol., 35, p. 1661Verweij, P.D., Haanepen, M.J., De Ridder, J.J., Driessen, W.L., Reedijk, J., (1992) Recl. Trav. Chim. Pays-Bas., 111, p. 371Rio-Segade, S., Perez-Cid, B., Bendicho, C., (1995) Fresen. J. Anal. Chem., 351, p. 798Arakaki, L.N.H., Airoldi, C., (2000) Polyhedron, 19, p. 367Prado, A.G.S., Arakaki, L.N.H., Airoldi, C., (2001) J. Chem. Soc., Dalton Trans., p. 2206Sales, J.A.A., Prado, A.G.S., Airoldi, C., (2002) Polyhedron, 21, p. 2647Arakaki, L.N.H., Airoldi, C., (1999) Quim. Nova, 22, p. 246Rauf, N., Tahir, S.S., (2000) J. Chem. Thermodyn., 32, p. 651Voronkov, M.G., Vlasova, N.N., Pozhidaev, Y.N., (2000) Appl. Organometal. Chem., 14, p. 287Sales, J.A.A., Airoldi, C., (2003) J. Non-cryst. Solids, 330, p. 142Silva, C.R., Airoldi, C., (1997) J. Colloid Interface Sci., 195, p. 381Prado, A.G.S., Arakaki, L.N.H., Airoldi, C., (2002) Green Chem., 4, p. 42Fonseca, M.G., Airoldi, C., (2000) Thermochim. Acta, 359, p. 1Airoldi, C., Santos, M.R.M.C., (1994) J. Mater. Chem., 4, p. 1479Fonseca, M.G., Simoni, J.A., Airoldi, C., (2001) Thermochim. Acta, 369, p. 17Arakaki, L.N.H., Nunes, L.M., Airoldi, C., (2000) J. Colloid Interface Sci., 228, p. 46White, L.D., Tripp, C.P., (2000) J. Colloid Interface Sci., 227, p. 237Cestari, A.R., Airoldi, C., (1995) J. Therm. Anal. Calorim., 44, p. 79Prado, A.G.S., Airoldi, C., (2001) Anal. Chim. Acta, 432, p. 201Espínola, J.G.P., Oliveira, S.F., Lemus, W.E.S., Souza, A.G., Airoldi, C., Moreira, J.C.A., (2000) Colloids Surf. a, 166, p. 45Irving, H., Williams, R.J.P., (1958) J. Chem. Soc., p. 3192Fonseca, M.G., Oliveira, A.S., Airoldi, C., (2001) J. Colloid Interface Sci., 240, p. 533Fonseca, M.G., Airoldi, C., (2001) J. Colloid Interface Sci., 240, p. 229Fonseca, M.G., Airoldi, C., (1999) J. Chem. Soc., Dalton Trans., p. 368
The Toxic Effect On Soil Microbial Activity Caused By The Free Or Immobilized Pesticide Diuron
No full textThe pesticide diuron (3-(3,4-dichlorophenyl)-1,1-dimethylurea) was anchored onto silica gel to yield a new surface. Both free and immobilized pesticide were applied on typical Brazilian agricultural soil and the toxic effects on microbial activity of this red Latosol soil was followed by microcalorimetry. The activity of the microorganisms on 1.50g of soil sample was stimulated by addition of 6.0mg of glucose plus 6.0mg of ammonium sulfate under 34.8% controlled humidity at 298.15±0.02 K. The activity was recorded through power-time curves for increasing amounts of the active principle, varying from 0 to 333.33 μgg-1. The increasing amounts of diuron, either free or immobilized, caused a decrease of the original thermal effect. The calorimetric data showed that the anchored pesticide presented a much lower toxic effect than free diuron on microbial activity. © 2002 Elsevier Science B.V. All rights reserved.3941-2155162Kenawy, E.R., Sherrington, D.C., (1992) Eur. Polym. J., 8, p. 841Cox, L., Celis, O., Hermosin, M.C., Cornejo, J., (2000) J. Agric. Food Chem., 48, p. 93Templeton, S.R., Zilerman, D., Yoo, S.J., (1998) Environ. Sci. Technol., 3, p. 1340Ritter, W.F., Scarborough, R.W., Chrirnside, A.E., (1994) J. Contam. Hydrol., 15, p. 73Vieira, E.M., Prado, A.G.S., Rezende, M.O.O., (1999) Quim. Nova, 22, p. 305Prado, A.G.S., Vieira, E.M., Rezende, M.O.O., (2001) J. Braz. Chem. Soc., 12, p. 485Calvet, R., (1989) Environ. Health Perspect., 83, p. 145Prado, A.G.S., Vieira, E.M., Rezende, M.O.O., (1998) An. Assoc. Bras. Quim., 47, p. 239Prado, A.G.S., Airoldi, C., (2000) Pest Manage. Sci., 56, p. 419Prado, A.G.S., Airoldi, C., (2001) Pest Manage. Sci., 57, p. 640Tomlin, C., (1995) The Pesticide Manual, , Crop Protection Publications, New YorkVieira, R.F., (1999) Pesqui. Agropec. Bras., 34, p. 897Prado, A.G.S., Airoldi, C., (2001) J. Environ. Monit., 3, p. 394Kok, F.N., Arika, M.Y., Genar, O., Abak, K., Hasira, V., (1999) Pestic. Sci., 55, p. 1194Szente, L., (1998) J. Therm. Anal. Calorim., 51, p. 957Ferraz, A., Souza, J.A., Silva, F.T., Goncalves, A.R., Bruns, R.E., Cotrim, A.R., Wilkins, R.M., (1997) J. Agric. Food Chem., 45, p. 1001Esposito, E., Paulilo, S.M., Manfio, G.P., (1998) Chemosphere, 37, p. 571Prado, A.G.S., Airoldi, C., (2001) J. Coll. Interf. Sci., 236, p. 161Prado, A.G.S., Airoldi, C., (2000) Thermochim. Acta, 349, p. 17Barros, N., Feijoo, S., Simoni, J.A., Prado, A.G.S., Barboza, E.D., Airoldi, C., (1999) Thermochim. Acta, 328, p. 99Prado, A.G.S., Airoldi, C., (2001) Anal. Chim. Acta, 432, p. 201Prado, A.G.S., Airoldi, C., (1999) Thermochim. Acta, 332, p. 71Raubuch, M., Beese, F., (1999) Soil Biol. Biochem., 31, p. 332Airoldi, C., Critter, S.A.M., (1996) Thermochim. Acta, 288, p. 73Volpe, P.L.O., (1997) J. Braz. Chem. Soc., 8, p. 343Welp, G., Brummer, G.W., (1997) Ecotox. Environ. Safe, 37, p. 37Yamaguchi, M., Peng, X.X., (1995) Plant Soil, 173, p. 2
Calorimetric Study Of Amino Modified Talc Matrices And Copper Salts. An Evidence Of The Chelate Effect
No full textThe surface of natural talc was modified with organosilanes (H3CO)3SiR, for R=-(CH2)3NH2,-(CH2)3NH(CH 2)2NH2 and -(CH2)3NH(CH2)2 NH(CH2)2NH2, resulting in the inorganic-organic hybrids TC1, TC2 and TC3. These aminated talcs contain 4.38, 2.56 and 2.03 mmol g-1 of immobilized organic chains for TCx (x=1 to 3), respectively. The chemisorption isotherm data obtained by a batchwise process were adjusted to a modified Langmuir equation, to give the maximum adsorption capacity TC1>TC2>TC3. The chelate effect was illustrated through calorimetric titration, giving the highest enthalpic values for TC2 and TC3 hybrids and favoured for sulfate counter anion. The enthalpic and entropic values indicated favourable reaction between copper-basic nitrogen center atoms on pendant chain covalently bonded to the inorganic backbone.641273280Ruiz-Hitzky, E., Rojo, J.M., Lagaly, G., (1985) Colloid Polym. Sci., 263, p. 1025Tiang, F., Xiao, X., Loy, M.M.T., (1999) Langmuir, 15, p. 244Mukkanti, K., Rao, Y.W.S., Choudry, B.M., (1989) Tetrahedron Letters, 30, p. 251Silva, C.R., Jardim, I.C.S.F., Airoldi, C., (1999) J. High Res. Chrom., 2, p. 103Walcarius, A., (1998) Electroanalyst, 10, p. 1217Airoldi, C., Monteiro O.A.C., Jr., (2000) J. Appl. Polym. Sci., 77, p. 6000Fonseca, M.G., Silva, C.R., Airoldi, C., (1999) Langmuir, 15, p. 48Fonseca, M.G., Airoldi, C., (1999) J. Chem. Soc. Dalton Trans., 3687Fonseca, M.G., Espínola, J.G., Oliveira, S.F., Ramos, L.C., Souza, A.G., Airoldi, C., (1998) Colloids Surf., A, 133, p. 205Airoldi, C., Alcântara, E.F.C., (1995) J. Chem. Thermodynamics, 27, p. 623Santos, M.R.M.C., Airoldi, C., (1996) J. Colloid Interface Sci., 183, p. 416Arakaki, L.N.H., Airoldi, C., (2000) Polyhedron, 19, p. 367Fonseca, M.G., Airoldi, C., (1999) J. Mater. Chem., 9, p. 1375Johansson, U., Holmgren, A., Forling, W., Frost, R.L., (1999) Clays Miner., 34, p. 239Newman, A.C.D., (1987) Chemistry of Clays and Clays Minerals, , Longman Scientific & Technical, LondonWesolowski, M., (1994) Thermochim. Acta, 78, p. 395Monteiro O.A.C., Jr., Airoldi, C., (1999) J. Colloid Interface Sci., 212, p. 212Arakaki, L.N.H., Nunes, L.M., Simoni, J.A., Airoldi, C., (2000) J. Colloid Interface Sci., 228, p. 46Fonseca, M.G., Airoldi, C., Mater. Res. Bull., , in pressMosser, C., (1992) Clays Clay Miner., 5, p. 593Taylor, I., Howard, A.G., (1993) Anal. Chim. Acta, 271, p. 77Huheey, J.E., (1972) Inorganic ChemistryPrinciples of Structure and Reactivity, , New YorkKrestov, G.A., (1991) Thermodynamics of Solvation: Solution and DissolutionIons and SolventsStructure and Energetics, , Ellis Horwood, 1st ed., Londo
The Inhibitory Biodegradation Effects Of The Pesticide 2,4-d When Chemically Anchored On Silica Gel
No full textThe pesticide 2,4-D (2,4-dichlolorophenoxyacetic acid) was immobilized on a silica gel surface to yield a new compound designed SiD. The free and anchored pesticide was applied to typical Brazilian agricultural soils and the biodegradation caused by microbial activity was followed by microcalorimetry. The activity of the microorganisms on soil samples under 34.8% of controlled humidity at 298.15 ± 0.02 K was determined through power-time curves. The recorded curves for increasing amounts of the 2,4-D active principle varied from zero to 6.67 mg per gram of soil. The increased amounts of both free and immobilized pesticide caused an enhancement of the original thermal effect. The calorimetric data demonstrated that the anchored pesticide (SiD) presents a much lower biodegradation with microbial activity, when compared with the free pesticide (2,4-D). © 2002 Elsevier Science B.V. All rights reserved.3941-2163169Mathenson, V.G., Forney, L.J., Suwa, Y., Nakasu, C.H., Sextone, A.J., Holben, W., (1996) Environ. Appl. Microbiol., 62, p. 2457Cotterill, J.V., Wilkins, R.M., (1996) J. Agric. Food Chem., 44, p. 2908Kenawy, E.R., Sherrington, D.C., (1992) Eur. Polym. J., 28, p. 841Tundo, P., Anastas, P., Black, D.S., Breen, J., Collins, T., Memoli, S., Miyamoto, J., Turnas, W., (2000) Pure Appl. Chem., 72, p. 1207Kok, F.N., Arika, M.V., Abak, K., Hashira, V., (1999) Pestic. Sci., 55, p. 1194Szente, L., (1998) J. Therm. Anal. Calorim., 51, p. 957Esposito, E., Paulilo, S.M., Manfio, G.P., (1998) Chemosphere, 37, p. 541Prado, A.G.S., Airoldi, C., (2000) Thermochim. Acta, 349, p. 17Critter, S.A.M., Simoni, J.A., Airoldi, C., (1994) Thermochim. Acta, 232, p. 145Beezer, A.E., (1980) Biological Microcalorimetry, , Academic Press, LondonPrado, A.G.S., Airoldi, C., (2000) Pest Manage. Sci., 56, p. 419Prado, A.G.S., Airoldi, C., (2001) Thermochim. Acta, 371, p. 169Barros, N., Feijoo, S., Simoni, J.A., Prado, A.G.S., Barboza, F.D., Airoldi, C., (1999) Thermochim. Acta, 328, p. 99Prado, A.G.S., Rezende, M.O.O., (1999) An. Ass. Bras. Quim., 48, p. 186Prado, A.G.S., Airoldi, C., (2001) J. Colloid Interf. Sci., 236, p. 161Prado, A.G.S., Airoldi, C., (2001) Anal. Chim. Acta, 432, p. 201Prado, A.G.S., Airoldi, C., (1999) Thermochim. Acta, 332, p. 71(1997) Environ. Sci. Technol., 31, pp. 20
Anchored Thiol Smectite Clay-kinetic And Thermodynamic Studies Of Divalent Copper And Cobalt Adsorption
No full textA natural smectite clay sample from Serra de Maicuru, Pará State, Brazil, had aluminum and zirconium polyoxycations inserted within the interlayer space. The precursor and pillarized smectites were organofunctionalized with the silyating agent 3-mercaptopropyltrimethoxysilane. The basal spacing of 1.47 nm for natural clay increased to 2.58 and 2.63 nm, for pillared aluminum, SAl/SH, and zirconium, SZr/SH, and increases in the surface area from 44 to 583 and 585 m2 g-1, respectively. These chemically immobilized clay samples adsorb divalent copper and cobalt cations from aqueous solutions of pH 5.0 at 298±1 K. The Langmuir, Redlich-Peterson and Toth adsorption isotherm models have been applied to fit the experimental data with a nonlinear approach. From the cation/basic center interactions for each smectite at the solid-liquid interface, by using van't Hoff methodology, the equilibrium constant and exothermic thermal effects were calculated. By considering the net interactive number of moles for each cation and the equilibrium constant, the enthalpy, ΔintH0 (-9.2±0.2 to -10.2±0.2 kJ mol-1) and negative Gibbs free energy, ΔintG0 (-23.9±0.1 to -28.7±0.1 kJ mol-1) were calculated. These values enabled the positive entropy, ΔintS0 (51.3±0.3 to 55.0±0.3 JK-1 mol-1) determination. The cation-sulfur interactive process is spontaneous in nature, reflecting the favorable enthalpic and entropic results. The kinetics of adsorption demonstrated that the fit is in agreement with a second-order model reaction with rate constant k2, varying from 4.8×10-2 to 15.0×10-2 and 3.9×10-2 to 12.2×10-2 mmol-1 min-1 for copper and cobalt, respectively. © 2008.181925072515Bhattacharyya, K.G., Gupta, S.S., (2006) Colloids Surf. A, 277, p. 191Manohar, D.M., Noeline, B.F., Anirudhan, T.S., (2006) Appl. Clay Sci., 31, p. 194Bayramoglu, G., Bektas, S., Arica, M.Y., (2003) J. Hazard. Mater., 101, p. 285Yu, B., Zang, Y., Shukla, A., Shukla, S.S., Dorris, K.L., (2000) J. Hazard. Mater., 80, p. 33Tunney, J.J., Detellier, C., (1996) Chem. Mater., 8, p. 927Wada, N., Raythatha, R., Minomura, S., (1987) Solid State Commun., 63, p. 783Frost, R.L., Tran, T.H.T., Kristóf, J., (1997) Clay Miner., 32, p. 587Temkin, N., Kadinci, E., Demirbas, O., Alkan, M., Kara, A.J., (2006) J. Colloid Interface Sci., 89, p. 472Guerra, D.L., Lemos, V.P., Airoldi, C., Angélica, R.S., (2006) Polyhedron, 25, p. 2880Airoldi, C., Roca, S., (1996) J. Mater. Chem., 6, p. 1963Nunes, L.M., Airoldi, C., (2000) J. Solid State Chem., 154, p. 557Nunes, L.M., Airoldi, C., (1999) Mater. Res. Bull., 34, p. 2121Tsai, S.C., Juang, K.W., (2000) J. Radional. Nucl. Chem., 243, p. 741Ruiz, V.S.O., Petrucelli, G.C., Airoldi, C., (2006) J. Mater. Chem., 16, p. 2338Macedo, T.R., Petrucelli, G.C., Airoldi, C., (2007) Clay Clay Miner., 55, p. 151Ogawa, M., Okutomo, S., Kuroda, K., (1998) J. Am. Chem. Soc., 120, p. 7361Battacharyya, K.G., Gupta, S.S., (2005) Separ. Purif. Technol., 50, p. 388Prado, A.G.S., Airoldi, C., (2001) Anal. Chim. Acta, 432, p. 201Moore, D.M., Reynolds, R.C., (1989) X-ray Diffraction the Identification Analysis of Clay Minerals, , Oxford University Press pp. 179-201Machado, R.S.A., Fonseca, M.G., Arakaki, L.N.H., Oliveira, S.F., (2004) Talanta, 63, p. 317Machado, M.O., Lazarin, A.M., Airoldi, C., (2006) J. Chem. Thermodyn., 38, p. 130Ruiz, V.S.O., Airoldi, C., (2004) Thermochim. Acta, 420, p. 73Monteiro, O.A.C., Airoldi, C., (2005) J. Colloid Interface Sci., 282, p. 32Lazarin, A.M., Airoldi, C., (2006) J. Mater. Chem., 18, p. 2226Lima, C.B.A., Airoldi, C., (2002) Solid State Sci., 4, p. 1321Fonseca, M.G., Simoni, J.A., Airoldi, C., (2001) Thermochim. Acta, 369, p. 17Fonseca, M.G., Airoldi, C., (2000) Thermochim. Acta, 359, p. 1Karadag, D., Koc, Y., Turan, M., Ozturk, M., (2007) J. Hazard. Mater., 144, p. 432Ho, Y.S., (2006) Water Res., 40, p. 119Al-Ashem, S., Duvnjak, Z., (1999) Water Air Soil Pollut., 114, p. 251Padilha, P.D., Rocha, J.C., Moreira, J.C., Campos, J.T.D., Federici, C.D., (1997) Talanta, 45, p. 317Fonseca, M.G., Airoldi, C., (1999) J. Chem. Soc. Dalton Trans., 42, p. 3687Martin, A.I., Sanchez-Chaves, M., Arranz, F., (1999) React. Funct. Polym., 39, p. 179Ho, Y.S., McKay, G., (1994) Process Biochem., 34, p. 431Martinez, M., Miralles, N., Hidalgo, S., Fiol, N., Villaescusa, I., Poch, J., (2006) J. Hazard. Mater. B, 133, p. 203Ho, Y.S., (2006) J. Hazard. Mater., 136, p. 68
Thermochemical Data On Intercalation Of Aromatic Amines Into Crystalline α-titanium Hydrogenphosphate
No full textThe heterocyclic amines, 2-, 3- and 4-aminopyridine, 2-amino-4-methylpyridine and 2-aminobenzylamine, were intercalated into α-titanium hydrogenphosphate and characterized through infrared spectroscopy, X-ray diffractometry and thermogravimetry. On intercalation, these heterocyclic amines expanded the original 760 pm interlayer distance to 1338, 1177, 1262, 1577 and 1060 pm, for the same sequence of amines. The change in POH and amine group frequencies clearly indicated cyclic amine intercalation. From the combination of batch intercalation and calorimetric titration, the variation in enthalpy was calculated at 298.15 ± 0.02 K. The exothermic enthalpic results for the intercalation process gave the sequence of values: -36.75 ± 0.78; -20.42 ± 0.28, -35.22 ± 0.70, -14.02 ± 0.10 and -29.77 ± 0.29 kJ mol-1, respectively. The calculated negative Gibbs free energy and the majority of the positive entropic values are in agreement with the favorable intercalation of these guest molecules inside the cavity of the host inorganic crystalline lamellar compound. © 2004 Published by Elsevier B.V.4351118123Clearfield, A., (1982) Inorganic Ion Exchange Materials, , CRC Press Boca Raton, FLAlberti, G., Costantino, U., (1991) Inclusion Compounds, , J.L. Atwood J.E. Davies D.D. MacNicol Oxford University Press New YorkClearfield, A., Costantino, U., (1996) Comprehensive Supramolecular Chemistry, 7. , G. Alberti T. Bein Pergamon New YorkO'Hare, D., (1992) Inorganic Materials, , John Wiley EnglandDekany, I., Szirtes, L., (1995) J. Radioanal. Nucl. Chem., 190, p. 167Kakiguchi, K., Baba, Y., Yanagida, T., Danjo, M., Tsuhako, M., Nariai, H., Yamaguchi, S., Motooka, I., (1995) Phosphorus Res. Bull., 5, p. 131Airoldi, C., Oliveira, S.F., (1991) Structr. Chem., 2, p. 41Airoldi, C., Roca, S., (1996) J. Mater. Chem., 6, p. 1963Suarez, M., Rodríguez, M.L., Llavona, R., Barcina, L.M., Veja, A., Rodríguez, J., (1997) J. Chem. Soc., Dalton Trans., p. 2757Lima, C.B.A., Airoldi, C., (2003) Thermochim. Acta, 400, p. 51Airoldi, C., Nunes, L.M., Farias, R.F., (2000) Mater. Res. Bull., 35, p. 2081Nakayama, H., Eguchi, T., Nakamura, N., Danjo, M., Tsuhako, M., Nariai, H., Yamaguchi, S., Motooka, I., (1997) Bull. Chem. Soc. Jpn., 70, p. 1053Nunes, L.M., Airoldi, C., (1999) Chem. Mater., 11, p. 2069Nunes, L.M., Airoldi, C., (1999) Mater. Res. Bull., 34, p. 2121Nunes, L.M., Airoldi, C., (1999) Thermochim. Acta, 328, p. 297Lima, C.B.A., Airoldi, C., (2001) Int. J. Inorg. Chem., 3, p. 907Capkova, P., Schenk, H., (2003) J. Incl. Pehenom., 47, p. 1Espina, A., Jaimez, E., Khainakov, S.A., Trobajo, C., García, J.R., Rodríguez, J., (1998) J. Chem. Mater., 10, p. 2490Katritzky, A.R., Rees, C.W., (1984) Comprehensive Heterocyclic Chemistry, 2. , Pergamon Press OxfordAiroldi, C., Alcântara, E.F.C., (1995) J. Chem. Thermodyn., 27, p. 623Roca, S., Airoldi, C., (1997) J. Chem. Soc., Dalton Trans., p. 2517Vieira, E.F.S., Simoni, J.A., Airoldi, C., (1997) J. Mater. Chem., 7, p. 2249Airoldi, C., Nunes, L.M., (2000) Langmuir, 16, p. 1436Fonseca, M.G., Airoldi, C., (2001) J. Colloid Interface Sci., 240, p. 533Fonseca, M.G., Airoldi, C., (2001) J. Therm. Anal. Calorim., 64, p. 273Ashcroft, S.F., Mortimer, C.T., (1970) Thermochemistry of Transition Metal Complexes, , Academic Press LondonRibeiro Da Silva, M.A.V., Matos, M.A.R., Monte, M.J.S., (1990) J. Chem. Thermodyn., 22, p. 609Airoldi, C., Chagas, A.P., (1992) Coord. Chem. Rev., 119, p. 29Airoldi, C., Arakaki, L.N.H., (2002) J. Colloid Interface Sci., 249, p.
Thermodynamic Data For Divalent Cations Onto New Modified Glycidoxy Silica Surface At Solid/liquid Interface
No full textEthylenediamine molecule was chemically bonded on a silica gel surface previously anchored with 3-glycidoxypropyltrimethoxysilane. This new surface was employed to adsorb divalent cation from aqueous solutions at 2987±1 K. The series of adsorption isotherms were adjusted to a modified Langmuir equation from data obtained by suspending the solid with MCl2 (M = Cu, NJ, Zn and Co) solutions, which gave the maximum number of moles adsorbed as 1.54, 0.56, 0.45 and 0.36 mmol g-1 for Cu, Ni, Co and Zn, respectively. Suspended aliquots of the chemically modified surface were calorimetrically titrated and the thermodynamic data showed the system is favored enthalpically and by free Gibbs energy.701135141Wilken, R.D., (1992) Fresenius J. Anal. Chem., 342, p. 795Padilha, P.M., De Melo Gomes, L.A., Padilha, C.C.F., Moreira, J.C., Dias Filho, N.L., (1999) Anal. Lett., 32, p. 1807Padilha, P.M., Rocha, J.C., Moreira, J.C., Campos, J.T.S., Frederici, C.C., (1997) Talanta, 45, p. 317Price, P.M., Clark, J.H., Macquaire, D.J., (2000) J. Chem. Soc. Dalton Trans., p. 101Arakaki, L.N.H., Nunes, L.M., Airoldi, C., (2000) J. Coll. Int. Sci., 228, p. 46Voronkov, M.G., Vlasona, N.N., Pozhidaev, Y.N., (2000) Appl. Organometal. Chem., 14, p. 287Santos, M.R.M.C., Airoldi, C., (1996) J. Coll. Int. Sci., 183, p. 416Espinola, J.G.P., Oliveira, S.F., Lemus, W.E.S., Souza, A.G., Airoldi, C., Moreira, J.C.A., (2000) Colloids Surf. A., 166, p. 45Leyden, D.E., Luttrel, G.H., (1975) Anal. Chem., 47, p. 1612Seshadri, T., Haupt, H.J., (1988) Anal. Chem., 60, p. 47Santos, M.R.M.C., Airoldi, C., (1996) J. Coll. Int. Sci., 183, p. 416Airoldi, C., Santos, M.R.M.C., (1994) J. Mater. Chem., 4, p. 1479Arakaki, L.N.H., Airoldi, C., (2000) Polyhedron, 19, p. 367Arakaki, L.N.H., Airoldi, C., (1999) Quim. Nova, 22, p. 246Prado, A.G.S., Airoldi, C., (2000) Pest. Manag. Sci., 56, p. 419Dias Filho, N.L., Gushikem, Y., (1997) Sep. Sci. Technol., 32, p. 2535Prado, A.G.S., Airoldi, C., (2001) J. Coll. Int. Sci., 236, p. 161Prado, A.G.S., Airoldi, C., (2001) Anal. Chim. Acta., 432, p. 201Fonseca, M.G., Airoldi, C., (2001) J. Therm. Anal. Cal., 64, p. 273Fonseca, M.G., Simoni, J.A., Airoldi, C., (2001) Thermochim. Acta, 369, p. 1
N-alkylmonoamine Into Crystalline Lamellar Titanium Phenylphosphonate. Intercalation Enthalpies, Gibbs Free Energies And Entropies
No full textCrystalline lamellar titanium phenylphosphonate was intercalated with H-alkylmonoamines, H3C(CH2)n-NH2 (n=0 to 3), which decomposed on heating in four distinct stages. The lamellar compound was calorimetrically titrated with ethanolic amine solution at 298.15±0.02 K and the enthalpy, Gibbs free energy and entropy were calculated. With the exception of butylamine, the enthalpic values increased with the number of carbon atoms in the amine chain, as -16.20±0.22; -18.70±0.19; -23.70±0.24 and -18.30±0.22 kJ mol-1, from n=0 to 3. The exothermic enthalpic values reflected a favorable energetic process of intercalation, when the solvated ethanol molecules on inorganic matrix are progressively substituted by solute. The negative Gibbs free energy results supported the spontaneity of the reactions and the positive favorable entropic values are in agreement with the increase of solvent molecules in the reaction medium, as the amine becomes bonded to the crystalline lamellar inorganic matrix.712459465Anillo, A.A., García, M.A.V., Llavona, R., Suárez, M., Rodríguez, J., (1999) Mater. Res. Bull., 34, p. 627Clearfield, A., (1998) Progr. Inorg. Chem., 47, p. 371Zhang, B., Poojary, D.M., Clearfield, A., (1996) Chem. Mater., 8, p. 1333Cabeza, A., Aranda, M.A.G., Lara, M.M., Bruque, S., Sanz, J., (1996) Acta Cryst., B52, p. 982Hix, G.B., Harris, K.D.M., (1998) J. Mater. Chem., 8, p. 579García, M.A.V., Jaimez, E., Bortun, A., García, J.R., Rodrígues, J., (1995) J. Porous Mat., 2, p. 85Nunes, L.M., Airoldi, C., (1999) Chem. Mater., 11, p. 2069Nunes, L.M., Airoldi, C., (2000) J. Solid State Chem., 154, p. 557Fonseca, M.G., Airoldi, C., (2001) J. Therm. Anal. Cal., 64, p. 273Zhang, Y., Scott, K.J., Clearfield, A., (1995) J. Mater. Chem., 5, p. 315Fredoueil, F., Massiot, D., Janvier, P., Gingl, F., Doeuff, M.B., Evain, Clearfield, A., Bujoli, B., (1999) Inorg. Chem., 38, p. 1831Poojary, D.M., Clearfield, A., (1995) J. Am. Chem. Soc., 117, p. 11278Morizzi, J., Hobday, M., Rix, C., (2000) J. Mater. Chem., 10, p. 1693Zhang, Y., Scott, K.J., Clearfield, A., (1995) J. Mater. Chem., 5, p. 315Arújo, A.S., Medeiros, D.S., (1997) An. Assoc. Bras. Quim., 46, p. 50Lima, C.B.A., Airoldi, C., (2001) Int. J. Inorg. Mater., 3, p. 907Santos, M.R.M.C., Airoldi, C., (1996) J. Colloid Interface Sci., 183, p. 416Arakaki, L.N.H., Nunes, L.M., Simoni, J.A., Airoldi, C., (2000) J. Colloid Interface Sci., 228, p. 4
The Incorporation Of Propane-1,3-diamine Into Silylant Epoxide Group Through Homogeneous And Heterogeneous Routes
No full textThe polar organic molecule propane-1,3-diamine reacted: (i) with a 3-glycidoxypropyltrimethoxysilane silylant agent, previously anchored on a silica surface in a heterogeneous route to yield the product SiHT or (ii) with the same agent before immobilizing it on the support, in a homogeneous method, to produce a SiHM surface. The epoxy group was opened yielding chelating pendant groups bonded to the inorganic surface. Both products were characterized through elemental analysis, infrared spectroscopy, surface area and thermogravimetry. The ligand concentrations were 0.80 (SiHT) and 1.53 mmol (SiHM), per gram of silica. The heterogeneous route is an easier procedure to produce immobilization. However the homogeneous route provided conditions to obtain a higher density of pendant groups on the surface, which are potentially useful for extracting cations from solutions in an effective way. © 2002 Elsevier Science Ltd. All rights reserved.2125-2626472651Thornton, J., (2001) Pure Appl. Chem., 93, p. 1231Prado, A.G.S., Arakaki, L.N.H., Airoldi, C., (2001) J. Chem. Soc., Dalton Trans., p. 2206Hjeresen, D.L., Schutt, D.L., Boese, J.M., (2000) J. Chem. Educ., 77, p. 1543Winterton, N., (2001) Green Chem., 3, p. 73Prado, A.G.S., Airoldi, C., (2001) Anal. Chim. Acta, 432, p. 201Clark, J.H., Macquarrie, D.J., (1996) Chem. Soc. Rev., p. 303Prado, A.G.S., Airoldi, C., (2001) J. Colloid Interface Sci., 236, p. 161Prado, A.G.S., Airoldi, C., (2000) Pest Manag. Sci., 56, p. 419Wilson, K., Clark, J.H., (2000) Pure Appl. Chem., 72, p. 1313Padilha, P.M., De Melo Gomes, L.A., Padilha, C.C.F., Moreira, J.C., Dias Filho, N.L., (1999) Anal. Lett., 32, p. 1807Goswani, A., Singh, A.K., (2002) Anal. Chim. Acta, 454, p. 229Prado, A.G.S., Airoldi, C., (2001) Fresenius J. Anal. Chem., 371, p. 1028Silva, C.R., Jardim, I.C.S.F., Airoldi, C., (2001) J. Chromatogr. A, 913, p. 65Prado, A.G.S., Airoldi, C., (2002) Green Chem., 4, p. 288Arakaki, L.N.H., Airoldi, C., (2001) Polyhedron, 20, p. 929Solomons, T.W.G., (1994) Fundamentals of Organic Chemistry, 4th Ed., , Wiley, New YorkTuel, A., Hommel, H., Legrand, A.P., Gonnord, M.F., Mincsovics, E., Siouffi, A.M., (1992) J. Chim. Phys., 89, p. 477Behringer, K.D., Blumel, J., (1996) J. Liq. Chromatogr. Rel. Technol., 19, p. 2753Merckle, C., Blumel, J., (2001) Chem. Mater., 13, p. 3617Prado, A.G.S., Arakaki, L.N.H., Airoldi, C., (2002) Green Chem., 4, p. 4
Crystalline Calcium Phenylphosphonate - Thermodynamic Data On N-akylmonoamine Intercalations
No full textLamellar crystalline calcium phenylphosphonate, as anhydrous Ca(HO3PC6H5)2 and hydrated Ca(HO3PC6H5)2· 2H2O compounds, were used as hosts for intercalation of polar n-alkylmonoamine molecules of the general formula CH3(CH2)nNH2 (n = 0-4, 7) in water or 1,2-dichloroethane. An increase in the interlayer distance was observed. The exothermic enthalpic values for intercalation increased with the number of carbon atoms and with increasing concentration of the amines. The intercalation followed by a titration procedure in the solid/liquid interface with Ca(HO3PC6H5)2· 2H2O and Ca(HO3PC6H5)2 gave the enthalpy/number of carbons correlations: ΔintH = -(1.74 ± 0.43)-(1.30 ± 0.13)nc and Δint H = -(4.15 ± 0.15)-(1.07 ± 0.03)nc, for water and 1,2-dichloroethane, respectively. A similar correlation ΔintH = -(4.27 ± 0.80)-(1.85 ± 0.21)nc was obtained in water by using the ampoule breaking procedure for Ca(HO3PC6H5)2· 2H2O. The increase in exothermic enthalpic values with the increase in n-aliphatic carbon atoms is more pronounced for the anhydrous compound and also when using the ampoule breaking procedure. The Gibbs free energies are negative. Positive entropic values favor intercalation in these systems. © 2002 Elsevier Science B.V. All rights reserved.40001/02/155159Clearfield, A., (1998) Progr. Inorg. Chem., 47, p. 371Alberti, G., Bein, T., (1996) Comprehensive Supramolecular Chemistry, 7. , Pergamon Press, New YorkOgawa, M., Kuroda, K., (1995) Chem. Rev., 95, p. 399Aranda, P., Casal, B., Fripiat, J.J., Hitzky, E.R., (1994) Langmuir, 10, p. 1207Guliants, V.V., Benziger, J.B., Sundaresan, S., Wachs, I.E., Jehng, J.M., (1995) Chem. Mater., 7, p. 1493Hix, G.B., Harris, K.D.M., (1998) J. Mater. Chem., 8, p. 579Suib, S.L., (1993) Chem. Rev., 93, p. 803Fredoueil, F., Massiot, D., Janvier, P., Gingl, F., Doeuff, M.B., Evain, M., Clearfield, A., Bujoli, B., (1999) Inorg. Chem., 38, p. 1831Nunes, L.M., Airoldi, C., (2000) J. Solid State Chem., 154, p. 557Airoldi, C., Nunes, L.M., De Farias, R.F., (2000) Mater. Res. Bull., 35, p. 2081Roca, S., Airoldi, C., (1997) J. Chem. Soc., Dalton Trans., p. 2517Ogawa, M., Kuroda, K., (1997) Bull. Chem. Soc. Jpn., 70, p. 2593Fonseca, M.G., Airoldi, C., (2001) J. Colloid Interf. Sci., 240, p. 229Airoldi, C., De Oliveira, S.F., (1991) Struct. Chem., 2, p. 41Airoldi, C., Roca, S., (1996) J. Mater. Chem., 6, p. 1963Airoldi, C., Arakaki, L.N.H., (2001) Polyhedron, 20, p. 929Airoldi, C., Arakaki, L.N.H., (2002) J. Colloid Interf. Sci., 249, p. 1De Farias, R.F., Airoldi, C., (2001) Thermochim. Acta, 378, p. 113Cao, G., Lynch, V.M., Swinnea, J.S., Mallouk, T.E., (1990) Inorg. Chem., 29, p. 2112Roca, S., Chagas, A.P., Airoldi, C., (1995) J. Solut. Chem., 24, p. 39Vogel, A., (1978) A Text-Book of Quantitative Inorganic Analysis: Theory and Practice, 4th Ed., , Longmans, LondonSuarez, M., Garcia, J.R., (1983) J. Mater. Chem. Phys., 8, p. 451Airoldi, C., Oliveira, S.F., (1992) J. Brazilian Chem. Soc., 3, p. 47Lima, C.B.A., Airoldi, C., unpublished resultsFonseca, M.G., Silva, C.R., Airoldi, C., (1999) Langmuir, 15, p. 5048Monteiro, O.A.C., Airoldi, C., (1999) J. Colloid Interf. Sci., 212, p. 212Airoldi, C., Alcântara, E.F.C., (1995) J. Chem. Thermodyn., 27, p. 623Airoldi, C., Roca, S., (1993) J. Solut. Chem., 22, p. 707Airoldi, C., Prandini, D.S., (1999) Thermochim. Acta, 328, p. 2
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