Solubilization of pyrene by anionic?nonionic mixed surfactants

Zhou, Wenjun; Zhu, Lizhong

doi:10.1016/j.jhazmat.2004.03.018

Cited by 109 publications

(50 citation statements)

References 36 publications

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“…On the other hand, studies on solubilization of pyrene by LA23EOA surfactant micelles reported conflicting MSR values, namely 0.062 [8] and 0.038 [21]. Our MSR value (0.038) agrees with the latter.…”

Section: Resultssupporting

confidence: 80%

Sodium Lauryl Ether Sulfate Micellization and Water Solubility Enhancement Towards Naphthalene and Pyrene: Effect of the Degree of Ethoxylation

Aoudia

Al-Haddabi

Al-Harthi

et al. 2009

J Surfact & Detergents

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The effect of ethoxylation on self-aggregation behavior in aqueous media of sodium lauryl ether sulfate (SLES), C 12 H 25 (OCH 2 CH 2 ) x OSO 3 Na, where x = 1 (SLE1S), x = 2 (SLE2S), and x = (SLE3S) was investigated. CMCs were determined from the effect of surfactant concentration on (2,2 0 -bipyridine dichlororuthenium(II) hexahydrate (Ru(bipy) 3 2? ,2Cl -) fluorescence emission. Aggregation numbers and micelle concentrations were estimated from the fluorescent quenching of (Ru(bipy) 3 2? ,2Cl -) by 9-methylanthracene. Interestingly, critical micelle concentrations (0.80 mM), average aggregation numbers (N = 43), and micelle concentrations ([M] = 40 lM) were found to be independent of the degree of ethoxylation. Water solubilization enhancement of naphthalene and pyrene by SLES was also investigated. Water solubility enhancement for naphthalene and pyrene was observed with increasing degrees of ethoxylation and follow the order SLE3S [ SLE2S [ SLE1S. The higher impact of oxyethylene (OE) groups on solubilization enhancement of naphthalene over pyrene was taken as an indication for a preferential distribution of the relatively polar organic naphthalene molecule at the outer layer of the micelle in close contact with the hydrated oxyethylene units, thereby allowing for a strong polycyclic aromatic hydrocarbon (PAH)-micelle interaction. On the other hand, pyrene molecule is preferentially distributed in the core of the micelle, relatively far away from the OE units located at the micelle-water interface for PAH-micelle interaction to occur. Water solubility enhancement for both PAHs was also was associated with an increase in SLES micelle size with the degree of ethoxylation as well as to the accessibility of the locus solubilization for the solute.

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Section: Resultssupporting

confidence: 80%

Sodium Lauryl Ether Sulfate Micellization and Water Solubility Enhancement Towards Naphthalene and Pyrene: Effect of the Degree of Ethoxylation

Aoudia

Al-Haddabi

Al-Harthi

et al. 2009

J Surfact & Detergents

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“…The CMC of SDS is obtained at 0.1wt% (3.468 mM/L or 1g/L) while the CMC value of TX100 achieved is about 0.02 wt%, much lower than that obtained for SDS. These values are comparable well with values reported in previous published studies (Zhou and Zhu, 2004;Zhou and Zhu, 2007a&b;Zhu and Feng, 2003).…”

Section: Surfactant Aqueous Solutionssupporting

confidence: 93%

“…It is a nonionic surfactant (C 8 H 17 C 6 H 4 [OCH 2 CH 2 ]xOH) with a CMC which spans between 0.13-0.2 g/L (0.2-0.31 mmol/L) (Zhou and Zhu, 2004;Zhou and Zhu, 2007a&b;Zhu and Feng, 2003;Rodriguez-Cruz et al, 2005;Zhao and Zhu, 2006). It has an average of 9.5 ethylene oxide units per molecule with an average molecular weight of 646.37g/mol.…”

Section: Surfactantsmentioning

confidence: 99%

“…It has an average of 9.5 ethylene oxide units per molecule with an average molecular weight of 646.37g/mol. Sodium Dodecylsulfate-SDS (C 12 H 24 NaSO 4 ) is an anionic surfactant with a CMC which spans between 1-2.4 g/L (3.32-8.4 mmol/L) (Zhou and Zhu, 2004;Zhu and Feng, 2003;Rodriguez-Cruz et al, 2005). SDS molecular weight is 288.4 g/mol and was supplied by Merck with a high grade of purity (99%).…”

Section: Surfactantsmentioning

confidence: 99%

See 1 more Smart Citation

Modern Applied Science, Vol. 3, No. 2, February 2009, all in one file

MAS¹

2009

MAS

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Experiment was carried out in two parts to investigate the degradation profile of trimethoprim and sulphamethoxazole, antibacterial compounds in aqueous phase. In the first part of study, the effects of UV and TiO 2 on two antibiotics using the UV-water flow system (UVWFS) were examined. Obtained results revealed that trimethoprim and sulphamethoxazole pronounced 44 to 45% and 6 to 314% elevated rate of degradation in two TiO 2 doses, 0.05 and 0.1 g/l treatments with UV than only UV treatments which affords to draw a substantial conclusion that though both UV and TiO 2 have a crucial impact but the synergistic photocatalytic effects of the TiO 2 with UV attributes a rapid and higher degree of degradation of antibiotics compared to that of only UV at the same water flow rate. In this context, it may also be observed that effect of the dose of TiO 2 was very little in trimethoprim degradation but a significantly greater effects was revealed in sulphamethoxazole that indicating same number of TiO 2 molecules acted more favourably on higher number of sulphamethoxazole molecules than trimethoprim by photocatalytic activity which enhancing the rate of degradation reaction resulting in the rapid decrease of sulphamethoxazole concentration level in water. In second part of the study, three (15, 42 and 80 cc/min) water flow rates were employed using UVWFS maintaining same UV and TiO 2 dose 0.1 g/l to ascertain the effect of water flow rate in the antibiotic transformation process. The degradation efficiency in 80 cc/min water flow treatment was 113 and 61% higher in trimethoprim and 103 and 51% higher in sulphamethoxazole compared to that of 15 and 42 cc/min water flow treatments, respectively which clearly indicated that the rate of water flow is a paramount important, largely influencing the photocatalysis reaction process of TiO 2 and UV with antibiotics in water medium possibly enhancing movement velocity of their molecules. Besides it, trimethoprim degraded rapidly over sulphamethoxazole which might be inferred that higher water flow substantially increases the rate of oxidation and photocatalytic transformation of trimethoprim over sulphamethoxazole in the presence of TiO 2 and UV.

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“…Many theories have been proposed to explain the experimental results [9,[17][18][19][20][21][22][23][24][25]. Mixtures of surfactants of similar structures tend to behave ideally [26][27][28] whereas ionic-nonionic surfactant mixtures deviate from ideality [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Mixed Micellization and Interfacial Properties of Polyoxyethylene Sorbitan Esters with Cetylpyridinium Chloride: A Tensiometric Study

Rehman

Mir

Jan

et al. 2009

J Surfact & Detergents

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In this work a surface tensiometric method was used to study the effect of the chain length of non-ionic surfactants, viz. ethoxylated sorbitan esters, on micellar composition, critical micellar concentration, mutual interaction parameter (b 12 ), and activity coefficients of the mixed micelles formed with the cationic surfactant cetylpyridinium chloride at 25°C. The micellar characteristics evaluated using the Clint, Rubingh, and Blankschtein models deviated significantly from ideality, and were used to ascertain the validity of these theories. Thermodynamic stability in terms of Maeda's approach and interfacial properties is also discussed.

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Solubilization of pyrene by anionic?nonionic mixed surfactants

Cited by 109 publications

References 36 publications

Sodium Lauryl Ether Sulfate Micellization and Water Solubility Enhancement Towards Naphthalene and Pyrene: Effect of the Degree of Ethoxylation

Sodium Lauryl Ether Sulfate Micellization and Water Solubility Enhancement Towards Naphthalene and Pyrene: Effect of the Degree of Ethoxylation

Modern Applied Science, Vol. 3, No. 2, February 2009, all in one file

Mixed Micellization and Interfacial Properties of Polyoxyethylene Sorbitan Esters with Cetylpyridinium Chloride: A Tensiometric Study

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