Immobilization Of Ethylenesulfide On Silica Surface Using Acid And Base Catalysts : Aaadsorption And Thermodynamic Data

The reaction of cyclic ethylene sulfide with 3-aminopropyltrimethoxysilane resulted in a new silylating agent, which was anchored onto a silica surface via the sol-gel procedure using hydrochloric acid or ammonium hydroxide as acid or base catalysts, respectively. Both organofunctionalized surfaces have the ability to adsorb divalent cations from aqueous nitrate solution. Through calorimetric titrations, the thermodynamic data of cation-basic center interactions were obtained. Exothermic enthalpy values were obtained for all interaction processes. The calculated free Gibbs energy is in agreement with the spontaneity of the reactions and the positive entropy values for all reactions are favorable for these systems. © 2009 Akadémiai Kiadó, Budapest, Hungary.972383389Suzuki, K., Aoyagi, Y., Katada, N., Choi, M., Ryoo, R., Niwa, M., (2008) Catal. Today, 132, p. 38. , 10.1016/j.cattod.2007.12.010 1:CAS:528:DC%2BD1cXisVentrk%3DNaydenov, A., Konova, P., Nikolov, Pen., Klingstedt, F., Kumar, N., Kovacheva, D., Stefanov, P., Mehandjiev, D., (2008) Catal. Today, 137, p. 471. , 10.1016/j.cattod.2007.11.020 1:CAS:528:DC%2BD1cXptlynsr4%3DZhong, H., Zhu, G., Wang, P., Liu, J., Yang, J., Yang, Q., (2008) J. Chromatogr. A, 1190, p. 232. , 10.1016/j.chroma.2008.03.045 1:CAS:528:DC%2BD1cXkvFGiu74%3DAugusto Filha, V.L.S., Silva, O.G., Costa, J.R., Wanderley, A.F., Fonseca, M.G., Arakaki, L.N.H., Interaction of divalent cations Zn, Cd and Hg on surface of silica gelwith aminoethanethiol as evaluated by calorimetric titration (2007) Journal of Thermal Analysis and Calorimetry, 87 (3), pp. 621-625. , DOI 10.1007/s10973-006-7756-2Sousa, K.S., Augusto Filha, V.L.S., Pinto, V.H.A., Fonseca, M.G., Espínola, J.G.P., Arakaki, L.N.H., (2007) Quim. Nova, 30, p. 528Arakaki, L.N.H., Da Fonseca, M.G., Da Silva Filho, E.C., De M. Alves, A.P., De Sousa, K.S., Silva, A.L.P., Extraction of Pb(II), Cd(II), and Hg(II) from aqueous solution by nitrogen and thiol functionality grafted to silica gel measured by calorimetry (2006) Thermochimica Acta, 450 (1-2), pp. 12-15. , DOI 10.1016/j.tca.2006.06.012, PII S0040603106003364Ispir, E., Serin, S., (2008) J. Therm. Anal. Cal., 94, p. 281. , 10.1007/s10973-007-8900-3 1:CAS:528:DC%2BD1cXhtleitb3JAiroldi, C., (2008) Quim. Nova, 31, p. 144. , 1:CAS:528:DC%2BD1cXis1Knt78%3DStandeker, S., Novak, Z., Knez, Z., Adsorption of toxic organic compounds from water with hydrophobic silica aerogels (2007) Journal of Colloid and Interface Science, 310 (2), pp. 362-368. , DOI 10.1016/j.jcis.2007.02.021, PII S0021979707001786Nadzhafova, O., Etienne, M., Walcarius, A., Direct electrochemistry of hemoglobin and glucose oxidase in electrodeposited sol-gel silica thin films on glassy carbon (2007) Electrochemistry Communications, 9 (5), pp. 1189-1195. , DOI 10.1016/j.elecom.2007.01.010, PII S1388248107000136Silva, C.R., Airoldi, C., Acid and base catalysts in the hybrid silica sol-gel process (1997) Journal of Colloid and Interface Science, 195 (2), pp. 381-387. , DOI 10.1006/jcis.1997.5159Musat, V., Budrugeac, P., Gheorghies, C., (2008) J. Therm. Anal. Cal., 94, p. 373. , 10.1007/s10973-008-9109-9 1:CAS:528:DC%2BD1cXhtlOktrfMAiroldi, C., Arakaki, L.N.H., Immobilization of ethylenesulfide on silica surface through sol-gel process and some thermodynamic data of divalent cation interactions (2001) Polyhedron, 20 (9-10), pp. 929-936. , DOI 10.1016/S0277-5387(01)00743-4, PII S0277538701007434Airoldi, C., Arakaki, L.N.H., Two independent routes to synthesize identical silicas by grafting ethylenimine or 2-aminoethanethiol, their cation adsorbing abilities, and thermodynamic data (2002) Journal of Colloid and Interface Science, 249 (1), pp. 1-7. , DOI 10.1006/jcis.2001.8192Arakaki, L.N.H., Alves, A.P.M., Silva Filho, E.C., Fonseca, M.G., Oliveira, S.F., Espinola, J.G.P., Airoldi, C., Sequestration of Cu(II), Ni(II), and Co(II) by ethyleneimine immobilized on silica (2007) Thermochimica Acta, 453 (1), pp. 72-74. , DOI 10.1016/j.tca.2006.10.016, PII S0040603106005296Brunauer, S., Emett, P., Teller, E., (1938) J. Am. Chem. Soc., 60, p. 309. , 10.1021/ja01269a023 1:CAS:528:DyaA1cXivFaruw%3D%3DFlaschka, H.A., (1967) EDTA Titration, An Introduction to Theory and Practice, , 2nd Ed. Pergamon Press OxfordSales, J.A.A., Prado, A.G.S., Airoldi, C., Interaction of divalent copper with two diaminealkyl hexagonal mesoporous silicas evaluated by adsorption and thermochemical data (2005) Surface Science, 590 (1), pp. 51-62. , DOI 10.1016/j.susc.2005.06.007, PII S003960280500646