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DC Field | Value | Language |
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dc.contributor.author | Bastos, Joaquim Braga | - |
dc.date.accessioned | 2024-08-14T16:49:11Z | - |
dc.date.available | 2024-08-14T16:49:11Z | - |
dc.date.issued | 1977-12 | - |
dc.identifier.citation | BASTOS, Joaquim Braga. Adsorção de espécies poliméricas de Al (III) em caolinita. 1977. 70 f. Dissertação (Mestrado em Agronomia - Ciência do Solo) - Instituto de Agronomia, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, 1977. | pt_BR |
dc.identifier.uri | https://rima.ufrrj.br/jspui/handle/20.500.14407/17715 | - |
dc.description.abstract | No presente trabalho estudaram-se as propriedades de soluções diluídas de A1C13 da ordem de 5x10 -4M quando aquecidas a 80°C por tempo variável e o processo de adsorção do Al dessas soluções em caolinita sódica. Com relação ao efeito da temperatura sobre o Al confirmaram-se observações anteriores (Braun, 1971), indicando que o calor desencadeia um processo de polimerização em que são formados oxo-hidroxo-polímeros de estrutura boemítica, com a conseqüente liberação de prótons e concomitante diminuição da fração monomérica de Al determinada pelo método de Okura et al. (1962). Verifica-se também que as curvas de titulação das soluções de Al mostram três pontos distintos de inflexão, os quais sofrem deslocamentos proporcionais ao tempo de aquecimento a que foi submetida a solução. Por outro lado, o Al polimerizado é apenas parcialmente recuperado por digestão ácida e posterior determinação com 8-quinolinol. Uma pequena fração das formas polimerizadas apresenta uma surpreendente resistência a decomposição em meio ácido ou alcalino. Na reação com a caolinita-Na observou-se uma adsorção preferencial das formas poliméricas com relação às monoméricas ou de menor grau de agregação. Esta maior afinidade das formas poliméricas pela superfície da argila é ainda constatada quando da extração com KCl1 N, observando-se na primeira extração uma sensível predominância de formas monoméricas, enquanto que, nas extrações posteriores aumenta consideravelmente a proporção de formas poliméricas. No processo de adsorção parece ocorrer uma catálise de superfície em que formas menos agregadas de Al são polimerizadas na superfície da argila, podendo, a seguir, serem liberadas na solução em equilíbrio. Este mecanismo pode constituir-se em um importante fator determinante da gênese de gibsita em solos intemperizados, quando a própria caolinita serviria de catalisador para a nucleação desse mineral a partir do Al existente na solução ácida do solo. | pt_BR |
dc.language | por | pt_BR |
dc.publisher | Universidade Federal Rural do Rio de Janeiro | pt_BR |
dc.subject | Alumínio | pt_BR |
dc.subject | Espécies químicas de Alumínio | pt_BR |
dc.subject | Argilas caoliníticas | pt_BR |
dc.subject | Reações químicas | pt_BR |
dc.subject | Aquecimento | pt_BR |
dc.subject | Aluminum | pt_BR |
dc.subject | Al chemical species | pt_BR |
dc.subject | Kaolinitic clays | pt_BR |
dc.subject | Chemical reactions | pt_BR |
dc.subject | Heating | pt_BR |
dc.title | Adsorção de espécies poliméricas de Al (III) em caolinita | pt_BR |
dc.title.alternative | Adsorption of polymeric Al(III) species on kaolinite | en |
dc.type | Dissertação | pt_BR |
dc.description.abstractOther | The properties of dilute AlC13 (5x10-4 M) solutions. when heated at 80°C for increasing periods of time and the reactions of these heated solutions with Na-kaolinite were studied. Heat treatments induced formation of oxyhidroxy-polymeric species with boehmitic structure as previously observed by Braun (1971). Increasing heating time induced progressive disappearance of unpolymerized Al, as detected by the 8-quinolinol method of Okura et al. (1962), and concomitantly liberated proportional amounts of proton causing acidification of the solution. Titration curves of A1C13 solutions exhibited three different inflection points which where displaced by heat treatments, the intensity of the displacement being proportional to the heating time. The most part of the heat-polymerized Al could be recovered by an acid digestion whereas a small fraction was resistent either to moderately strong acid or moderately strong alkali digestion. In the adsorption process with Na-Kaolinite a preferencial adsorption of the polymeric species in relation to monomeric ones could be effectively detected. On the other hand, extraction with KCl 1 N removed at first a larger proportion of non aggregated specics of Al although a detectable fraction of polymeric Al was also removed. In subsequent extractions larger proportions of polymeric Al were removed and these proportions increased greatly in the third extraction. Besides the preferencial adsorption of polymeric species of Al it was observed what is possibly a process of surface catalysis by which aggregated ionic species of this metal can undergo further polymerization when adsorbed on the clay surface. Later, part of the old or the recently polymerized species can then leave the clay surface and diffuse to the solution phase where they act as precursors of crystal nucleous. Such a process can play an important pedogenetic role for gibbsite formation in highly weathered acid soils by leaviny the right concentration of Al in solution. | en |
dc.contributor.advisor1 | Braun, Walter Augusto Gross | - |
dc.contributor.advisor1Lattes | Não informado | pt_BR |
dc.contributor.referee1 | Braun, Walter Augusto Gross | - |
dc.contributor.referee2 | Leal, Jair Rocha | - |
dc.contributor.referee3 | Velloso, Ary Carlos Xavier | - |
dc.creator.Lattes | Não informado | pt_BR |
dc.publisher.country | Brasil | pt_BR |
dc.publisher.department | Instituto de Agronomia | pt_BR |
dc.publisher.initials | UFRRJ | pt_BR |
dc.publisher.program | Programa de Pós-Graduação em Agronomia - Ciência do Solo | pt_BR |
dc.relation.references | BRAUN, W.A.G., 1971, Aquatic chemistry of Al(III). Ph.D. The-sis. Califórnia University, Davis: 274p. BREMNER, J.M., 1965, Inorganic forms of nitrogen. In: Black, C.A. et al. (eds.). Methods of soil analysis. Part 2. A-gronomy 9: 1179-1232. Amer. Soc. Agron. BROWN, G. and NEWMAN, A.C.D., 1973, The reactions of solu-ble aluminium with montmorillonite. J. Soil. Sci. 24: 339-354. CARSTEA, D.D., HARWARD, M.E. and KNOX, E.G., 1970a, Formation and stability of hydroxy-Mg interlayers in phyllosilica-tes. Clays and Clay Minerais 18: 213-222. CARSTEA, D.D., HARWARD, M.E. and KNOX, E.G., 1970b, Compari-son of iron and aluminum hydroxy interlayers in montmo-rillonite and vermiculite: 1. Formation. Soil Sci. Soc. Amer. Proc. 34: 517-521. CARSTEA, D.D., HARWARD, M.E. and KNOX, E.G., 197Oc, Compari-son of iron and aluminum hydroxy interlayers in montmo-rillonite and vermiculite: II. Dissolution. Soil Sci. Soc. Amer. Proc. 34: 522-526. COLOMBERA, P.M., POSNER, A.M. and QUIRK, J.P., 1971, The ad-sorption of aluminium from hydroxy-aluminium solutions on to fithian illite. J. Soil Sci. 22: 118-128. COOK, L.A., 1939, Contribution to our information on grass burning. S. African J. Sci. 36: 270-282. COSTA, A.C. da e GODOY, H., 1962, Contribuição para o conhe¬cimento do clima do solo de Ribeirão Preto. Bragantia 21: 689-742. COULTER, B.S., 1969, The chemistry of hydrogen and alumini-um in soils, clay minerals and resins. Soil and Fertili-sers 32: 215-223. COULTER, B.S. and TALIBUDEEN, O., 1968, Calcium - aluminium exchange equilibria in clay minerals and acid soils. J. Soil Sci. 19: 237-250. FOSCOLOS, A.E., 1968, Cation exchange equilibrium constants of aluminum saturated montmorillonite and vermiculite clays. Soil Sci. Soc. Amer. Proc. 32: 350-354. FRINK, C.R., 1960, Reactions of the aluminum ion in aqueous solutions and clay suspensions. Ph.D. Thesis. Cornell U-niversity (Libr. Congr, Card. n° Mic. 61-1427) 156p. FRINK, C.R., 1965, Characterization of aluminum interlayers in soil clays. Soil Sci. Soc. Amer. Proc. 29: 379-382. FRINK, C.R. and SAWHNEY, B.L., 1967, Neutralization of dilu-te aqueous aluminum Salt solutions. Soil Sci. 103: 144¬148. GOTO, K. and YOTSUYANAGI, T., 1968, Determination of mononu-clear aluminum complexions in the presence of large a-mounts of polynuclear aluminum species. Nippon Kagaku Zasshi 89: 49-53. HOLMES, L.P., COLE, D.L. and EYRING, E.M., 1968, Kinetics of aluminum ion hydrolysis in dilute solutions, J. Phys. Chem. 72: 301-304. HSU, P.H., 1967, Effect of salts on the formation of bayeri-te versus pseudo-boehmite. Soil Sci. 103:101-110. HSU, P.H., 1968, Heterogeneity of montmorillonite surface and its effect on the nature of hydroxy-aluminum inter-layers. Clays and Clay Minerais 16: 303-310. HSU, P.H. and BATES, T.F., 1964, Fixation of hydroxy-alumi-num polymers by vermiculite. Soil Sci. Soc. Proc. 28: 763-769. KEREN, R., GAST, R.G. and BARNHISEL, R.I., 1977, Ion exchan-ge reactions in nondried chambers montmorillonite hydroxy-aluminum complexes. Soil Sci. Soc. Amer. J. 41: 34-39. LIPPENS, B.C. and STERGGERDA, J.J., 1970, Active alumina In Phisical and Chemical Aspects of Adsorbengts and Catalysts. Ed. by B.G. Lingeu. Accademic Press. N.W.: 171¬211. McLEAN, E.O., HEDDLESON, M.R., BARTLETT, R.J. and HOLOWAYCHUK, N., 1958, Aluminum in soil: I. Extraction and methods and manitudes in clays and Ohio soils. Soil Sci. Soc. Proc. 22:382-387. MISRA, U.K., BLANCHAR, R.W. and UPCHURCH, W.J., 1974. Alumi-num content of soil extracts as a function of pH and ionic strenght. Soil Sci. Soc. Amer. Proc. 38:897-902. NYE, P.H. and GREENLAND, D.J., 1965, The soil under shifting cultivation. Technical Communication. Cowgate, Norvich (51): 156p. OKURA, T., GOTO, K. and YOTSUYANAGI, T., 1962, Forms of alu-minum determined by 8-quinolinolate extraction method. Anal. Chem. 34:581-582. PIONKE, H.B. and COREY, R.B., 1967, Relations between aci-dic aluminum and soil pH, clay and organic matter. Soil Sci. Amer. Proc. 31:749-72. PRATT, P.F. and BAIR, F.L., 1961, A comparison of three rea-gents for the extraction of aluminum from soils. Soil Sci. 91:357-359. RAUPACH, M, 1963, Solubility of simple aluminum compounds expected in soils. II. Hydrolysis and conductance of Al3+. Aust. J. Soil Res. 1:36-45. RICH, C.I., 1968, Hydroxy-interlayers in expansible layer silicates. Clays and Clay Minerais 16:15-30. RICHBURG, J.S. and ADAMS, F., 1970, Solubility and hydroly-sis of aluminium in soil solutions and satured paste extracts. Soil Sci. Soc. Amer. Proc. 34:728-734. SANTOS, G. de A., 1976, Influência do tratamento térmico so¬bre o alumínio livre do solo. Tese. Mestrado. Universi¬dade Federal Rural do Rio de Janeiro. 90p. SANTOS, G. de A. e BRAUN, W.A.G., 1976, Influência do trata¬mento térmico sobre o alumínio do solo. Trabalho apre¬sentado no XVI Congresso Brasileiro de Ciência do Solo, São Luís-Ma. julho, 1977. TURNER, R.C., 1969, Three forms of aluminium in aqueous sys-tems determined by 8-quinolinolate extraction methods. Can. J. Chem. 47: 2521-2527. TURNER, R.C. and BRYDON, J.E., 1967a, Effect of lenght of time of reactions on some properties of suspensions of Arizona bentonite, illite, and kaolinite in which alu-minum hydroxide is precipitated. Soil Sci. 103:111-117. TURNER, R.C. and BRYDON, J.E., 1967b, Removal of interlayer aluminum hydroxide from montmorrillonite by seeding the suspension with gibsite. Soil Sci. 104:332-335. | pt_BR |
dc.subject.cnpq | Agronomia | pt_BR |
dc.subject.cnpq | Agronomia | pt_BR |
Appears in Collections: | Mestrado em Agronomia - Ciência do Solo |
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