Calorimetric study of phenol adsolubilisation by cationic surfactants adsorbed on a flat silica surface or confined within small mesopores of powdered MCM-41 alumino silicates

被引:16
作者
Benalla, H [1 ]
Zajac, J [1 ]
Partyka, S [1 ]
Rozière, J [1 ]
机构
[1] Univ Montpellier 2, Lab Agregats Mol & Mat Inorgan, UMR 5072, F-34095 Montpellier 5, France
关键词
phenol adsolubilisation; cationic surfactants; porous and non-porous silica; titration microcalorimetry;
D O I
10.1016/S0927-7757(01)01109-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Adsolubilisation of phenol by cationic surfactants adsorbed on a flat silica surface or confined within small mesopores of powdered MCM-41 aluminosilicates has been studied at room temperature by means of titration calorimetry. In aqueous solution of dodecyltrimethylammonium bromide (DTAB), the transfer of phenol to the outer portions of the surfactant micelles was considered to account for the slight depression of the CMC value and for the marked exothermic effect adding to that of the micellisation process. For the system containing non-porous X015M and DTAB, the determination of surfactant adsorption and phenol adsolubilisation isotherms was supplemented by calorimetric measurements of the differential enthalpy changes accompanying both phenomena. The displacement process was more exothermic when carried out in the presence of phenol. The uptake of aromatic molecules in the DTAB-X015M system was markedly increased compared with the adsorption of phenol onto bare silica surface. Aluminosilicate-encapsulated surfactant aggregates were prepared using two alkyltrimethylammonium bromides, i.e. C-12 and C-16, as the solid-structure-directing agents. The phenol adsolubilisation isotherms in both aluminosilicate-surfactant systems and the related enthalpy curves were determined over a wide range of phenol molality in the equilibrium bulk solution. For the two adsolubilisation host systems both with porous and non-porous substrate, phenol was shown to be localised on at least two different types of adsolubilisation sites, in order of decreasing thermal effect of transfer from the aqueous phase. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:259 / 271
页数:13
相关论文
共 58 条
[1]   ADMICELLAR CHROMATOGRAPHY - SEPARATION AND CONCENTRATION OF ISOMERS USING TWO-DIMENSIONAL SOLVENTS [J].
BARTON, JW ;
FITZGERALD, TP ;
LEE, C ;
OREAR, EA ;
HARWELL, JH .
SEPARATION SCIENCE AND TECHNOLOGY, 1988, 23 (6-7) :637-660
[2]   ENTHALPIES OF DILUTION OF AQUEOUS DECYLTRIMETHYLAMMONIUM, DODECYLTRIMETHYLAMMONIUM, TETRADECYLTRIMETHYLAMMONIUM, AND HEXADECYLTRIMETHYLAMMONIUM BROMIDES AT 10-DEGREES-C, 25-DEGREES-C, 40-DEGREES-C, AND 55-DEGREES-C [J].
BASHFORD, MT ;
WOOLLEY, EM .
JOURNAL OF PHYSICAL CHEMISTRY, 1985, 89 (14) :3173-3179
[3]  
BERNARD R, 1990, PROG COLL POL SCI S, V83, P110
[4]  
BOLT GH, 1957, J PHYS CHEM-US, V61, P166
[5]   HYDROPHOBIC AND COULOMBIC INTERACTIONS IN THE MICELLAR BINDING OF PHENOLS AND PHENOXIDE IONS [J].
BUNTON, CA ;
SEPULVEDA, L .
JOURNAL OF PHYSICAL CHEMISTRY, 1979, 83 (06) :680-683
[6]   HEATS OF SOLUTION OF ALIPHATIC AND AROMATIC, LINEAR, BRANCHED, AND CYCLIC ALCOHOLS IN AQUEOUS SODIUM DODECYL-SULFATE MICELLES AT 298-DEGREES-K [J].
BURY, R ;
TREINER, C .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1985, 103 (01) :1-10
[7]   FLUORESCENCE PROBE STUDIES ON THE STRUCTURE OF THE ADSORBED LAYER OF DODECYL-SULFATE AT THE ALUMINA-WATER INTERFACE [J].
CHANDAR, P ;
SOMASUNDARAN, P ;
TURRO, NJ .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1987, 117 (01) :31-46
[8]  
CHRISTIAN SD, 1995, SURFACTANT SCI SERIE, V55
[9]  
Clint J.H., 1992, Surfactant Aggregation
[10]   COMPLETE THERMODYNAMIC PROPERTIES OF NONYLTRIMETHYLAMMONIUM AND DECYLTRIMETHYLAMMONIUM BROMIDES IN WATER [J].
DELISI, R ;
OSTIGUY, C ;
PERRON, G ;
DESNOYERS, JE .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1979, 71 (01) :147-166