TRENDS IN THE ADSORPTION BEHAVIOR OF N-ALIPHATIC ALCOHOLS ON MERCURY FROM AQUEOUS 0.5 M NA2SO4

被引:65
作者
MONCELLI, MR
FORESTI, ML
GUIDELLI, R
机构
来源
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1990年 / 295卷 / 1-2期
关键词
D O I
10.1016/0022-0728(90)85018-Z
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The electrosorption behaviour of n-aliphatic alcohols from n-butanol to n-octanol at the mercury/water interface was determined from capacitive charge measurements by using a computerized chronocoulometric technique. The surface area A occupied by one adsorbed alcohol molecule at maximum coverage was found to increase by about 0.06 nm2 per each CH2 group, thus suggesting strongly that the alcohols are adsorbed on mercury from aqueous solutions of 0.5 M Na2SO4 in a flat orientation up to maximum coverage. This interpretation is further supported by the approximate constancy of the differential capacity at maximum coverage for all alcohols investigated, and by the gradual increase in the coefficient {A figure is presented} with an increase in chain length, where ΔGoads is the standard Gibbs energy of adsorption and σm is the charge density of maximum adsorption. This adsorption behaviour differs from that from aqueous 0.1 M NaF as reported by B.B. Damaskin, A.A. Survila and L.E. Rybalka (Elektrokhimiya, 3 (1967)146); in fact, the latter behaviour suggests a vertical orientation of the hydrocarbon chains at maximum coverage. © 1990.
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页码:225 / 238
页数:14
相关论文
共 29 条
[1]   MEDIUM EFFECTS - IMPLICATIONS IN STUDIES OF ADSORPTION OF ORGANIC SUBSTANCES AT ELECTRODES - EXPERIMENTAL VERIFICATION [J].
ABDELNABEY, BA ;
DEBATTIS.A ;
TRASATTI, S .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1974, 56 (01) :101-115
[2]   ON STRUCTURE OF CHARGED INTERFACES [J].
BOCKRIS, JO ;
DEVANATHAN, MAV ;
MULLER, K .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1963, 274 (1356) :55-+
[3]   ELECTROSORPTION OF TERT-BUTYL COMPOUNDS ON HG FROM AQUEOUS NA2SO4 SOLUTION - TERT-BUTYLAMINE [J].
BORGHESANI, G .
ELECTROCHIMICA ACTA, 1983, 28 (04) :483-490
[4]   A COMPARATIVE ADSORPTION STUDY OF 1-OCTANOL AND 4-OCTANOL AT THE MERCURY WATER INTERFACE [J].
CARLA, M ;
ALOISI, G ;
MONCELLI, MR ;
FORESTI, ML .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1989, 132 (01) :72-80
[5]   ADSORPTION BEHAVIOR OF NORMAL-HEXYLAMINE AT THE HG/WATER INTERPHASE AND ITS COMPARISON WITH A MOLECULAR-MODEL ACCOUNTING FOR LOCAL ORDER [J].
CARLA, M ;
ALOISI, G ;
FORESTI, ML ;
GUIDELLI, R .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1986, 197 (1-2) :123-141
[6]   NON-CONVENTIONAL NORMAL PULSE POLAROGRAPHIC TECHNIQUES WITH A STATIC MERCURY-ELECTRODE FOR APPLICATIONS AT VERY LOW REACTANT CONCENTRATIONS [J].
CARLA, M ;
DEVICENTE, MS ;
MONCELLI, MR ;
FORESTI, ML ;
GUIDELLI, R .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1988, 246 (02) :283-296
[7]  
DAMASKIN BB, 1967, ELEKTROKHIMIYA, V3, P927
[8]  
DAMASKIN BB, 1967, ELEKTROKHIMIYA, V3, P146
[9]  
DEBATTISTI A, 1974, J ELECTROANAL CHEM, V54, P1