Surfactants

Llenado, R. A.; Neubecker, Thomas A.

doi:10.1021/ac00256a008

Cited by 50 publications

(30 citation statements)

References 2 publications

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“…Llenado et al [7,8] have also summarised the more recent developments in nonionic surfactant analysis and Thomas [9] reviewed the methods available for water and effiuent analysis. A list of the techniques used for the analysis of nonionics is given in Table 1.…”

Section: Methodsmentioning

confidence: 99%

The Environmental Chemistry, Fate and Effects of Nonionic Surfactants

1992

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Section: Methodsmentioning

confidence: 99%

The Environmental Chemistry, Fate and Effects of Nonionic Surfactants

1992

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“…Then, the bottom phase was discharged and the upper phase was poured into a 10 mL cell holder. The detergent concentration was read at a wavelength of 652 nm using a DR5000 (HACH) spectrophotometer (23). The following equations were used to determine the adsorbent removal efficiency: R = (C 0 -C e )/C 0 (1) C 0 and C e are the initial and the final concentrations of surfactant (mg/L) (SDS concentration before and after adsorption), respectively.…”

Section: Batch Adsorption Studiesmentioning

confidence: 99%

Preparation of Magnetic Multi-Walled Carbon Nanotubes to Adsorb Sodium Dodecyl Sulfate (SDS)

Rafiee

Samadi

2017

Avicenna J Environ Health Eng

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Surfactants are one of the main groups of pollutants released into aqueous solutions due to human activities and their harmful effects have been proven on human. In this study, first, magnetic multi-walled carbon nanotubes (MMWCNTs) were synthesized and then, the effects of operating parameters such as surfactant concentration, adsorbent dosage, and pH values were analyzed on the adsorption process. MMWCNTs were characterized by means of X-ray diffraction (XRD) analysis and fourier transform infrared spectroscopy (FTIR). The optimal adsorption conditions were achieved at initial pH = 4.6, adsorbent concentration = 0.5 g/L, and initial SDS concentration = 15 mg/L. In addition, the equilibrium of sorption reached after 120 min and the maximum capacity of SDS for monolayer coverage was found to be 61 mg/g at 25°C. Kinetic studies were performed under optimal conditions and the sorption kinetics was described using the pseudo-second-order kinetic model. The experimental data were studied using Freundlich, Langmuir, and Sips models. Finally, the experimental data were fitted reasonably by Langmuir isotherm. The results demonstrated that MMWCNTs with respect to their high adsorption capacity, relatively low equilibrium time, and capability to be separated from aqueous solutions (after adsorption) could be applied to wastewater treatment.

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“…Separate information about the homologues and isomers can be obtained by gas chromatography (8)(9)(10), thin-layer chromatography [11], high-performance liquid chromatography (HLPC) [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] and capillary zone electrophoresis (CZE) [21,[28][29][30][31][32][33][34][35][36][37][38][39]. Ion-exchange HPLC is useful in identifying surfactant classes but inefficient in separating LAS homologues and isomers [18,24].…”

Section: Introductionmentioning

confidence: 99%

Separation of homologues and isomers of linear alkylbenzenesulfonates by capillary electrophoresis with sodium dodecyl sulfate, carboxylic acids and bile salts

2003

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The ability of several anionic compounds, including carboxylic and dicarboxylic acids, sodium dodecyl sulfate (SDS), and sodium deoxycholate (SDC) and other bile salts, to separate the C(10)-C(13) homologues and the corresponding 20 positional isomers of linear alkylbenzenesulfonates (LAS) by capillary electrophoresis was studied. Up to 19 peaks and a shoulder were observed with a background electrolyte (BGE) containing 10 mM phosphate (pH 6.8), 30% acetonitrile and 40 mM SDS, and 18 peaks were obtained with a BGE containing 10 mM borate (pH 9), 40% ethanol and 40 mM palmitic acid (PA). Resolution increased with the alkyl chain length of the carboxylic acid. Dicarboxylic acids with a short alkyl chain, as azelaic acid, were useful to separate the homologues without distinguishing between the isomers. Up to 16 peaks and a shoulder were distinguished with SDC. Resolution decreased with the other bile salts. The 6-C(11)/5-C(11) isomer pair was better resolved with SDC than with SDS, and the 2-C(12) isomer was isolated using both PA and SDC, but not with SDS. Only the 7-C(13)/6-C(13) pair could not be resolved with any of the discriminating agents used.

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Surfactants

Cited by 50 publications

References 2 publications

The Environmental Chemistry, Fate and Effects of Nonionic Surfactants

The Environmental Chemistry, Fate and Effects of Nonionic Surfactants

Preparation of Magnetic Multi-Walled Carbon Nanotubes to Adsorb Sodium Dodecyl Sulfate (SDS)

Separation of homologues and isomers of linear alkylbenzenesulfonates by capillary electrophoresis with sodium dodecyl sulfate, carboxylic acids and bile salts

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