Solubilization capabilities of mixtures of cationic Gemini surfactant with conventional cationic, nonionic and anionic surfactants towards polycyclic aromatic hydrocarbons
Solubilization capabilities of equimolar mixed micellar solutions of Gemini surfactant, C 16H 33N +(CH 3) 2 (CH 2) 5 N +(CH 3) 2 C 16H 33 2Br − (G) with cetylpyridinium chloride (CPC), sodium bis(2-ethylhexyl)sulfosuccinate (AOT) and Brij56 towards polycyclic aromatic hydrocarbons (PAHs), viz pyrene...
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Published in | Journal of hazardous materials Vol. 167; no. 1; pp. 575 - 581 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Kidlington
Elsevier B.V
15.08.2009
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Solubilization capabilities of equimolar mixed micellar solutions of Gemini surfactant, C
16H
33N
+(CH
3)
2
(CH
2)
5
N
+(CH
3)
2 C
16H
33 2Br
− (G) with cetylpyridinium chloride (CPC), sodium bis(2-ethylhexyl)sulfosuccinate (AOT) and Brij56 towards polycyclic aromatic hydrocarbons (PAHs), viz pyrene and anthracene are studied spectophotometerically at 25
°C and then compared. The results showed that irrespective of the surfactant type, the solubility of PAHs increases linearly with increasing surfactant concentration, as a consequence of association between the PAH and micelles. Solubilization capacity has been quantified in terms of molar solubilization ratio (MSR), micelle-water partition coefficient (
K
m), ratio of binding constant (
K
1) between the micelle and PAH to the aggregation number (
N) of surfactant solution and free energy of solubilization (
Δ
G
s
0
) of PAHs. Equimolar binary surfactant mixtures showed higher solubilization capacity than their respective individual surfactants except G-CPC wherein the values were intermediate between the two. The mixed micellization parameters viz interaction parameter,
β, micellar mole fraction within the mixed micelle,
X
i
, and activity coefficients,
f
i,
were evaluated using Rubingh approach. The values of
X
i
were then employed to evaluate solubilization efficiency of mixed micelles using Regular solution approach (RSA). In addition experimental micelle-water partition coefficients of hydrocarbons have been compared with those predicted theoretically by geometric mean equation for mixed Gemini-conventional surfactant systems. Such mixed systems promise to improve the performance of surfactant enhanced remediation of soils and sediments by decreasing the applied surfactant level and thus remediation cost. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1 |
ISSN: | 0304-3894 1873-3336 |
DOI: | 10.1016/j.jhazmat.2009.01.022 |