Thermodynamics of mixed anionic/nonionic surfactant adsorption on alumina

Lopata, Jeffrey J.; Werts, Kendall M.; Harwell, Jeffrey H.; Grady, Brian P.

doi:10.1016/j.jcis.2009.10.072

Cited by 19 publications

(11 citation statements)

References 33 publications

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“…The results agree well with the adsorption of alkyl sulfonate surfactants onto metal oxides [35]. The concentrations of the different AS surfactants in the mixture were much lower than the CMC; thus, the adsorption of AS surfactants followed the hemimicelle, monolayer formation, and then, admicelle formation with a bilayer occurred [36,37]. The adsorption efficiencies reached 99.9% and 81.71% for C14 and C12, respectively, while they were only 50.8% for C10 and 45.6% for C8.…”

Section: Preconcentration Of As Surfactants By Simultaneous Adsorptiosupporting

confidence: 81%

Separation and determination of alkyl sulfate surfactants in wastewater by capillary electrophoresis coupled with contactless conductivity detection after preconcentration by simultaneous adsorption using alumina beads

et al. 2020

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The aim of the present study is to determine four anionic alkyl sulfate (AS) surfactants with different alkyl chains, namely, C8, C10, C12, and C14, in wastewater by CE with capacitively coupled contactless conductivity detection (CE‐C4D). The conditions effective for the separation of the four AS surfactants were systematically optimized and found to be in a Tris‐His (50 mM/20 mM) BGE solution at a pH of 8.95, using a separation voltage of +15 kV, hydrodynamic injection by siphoning using a 20 cm injection height and an injection time of 20 s. The LODs for C8, C10, C12, and C14 were 2.58, 2.30, 2.08, and 3.16 mg/L, respectively. The conditions used to achieve the simultaneous adsorption and preconcentration of the AS surfactants using Al2O3 beads were pH of 3 and 0.1 mM NaCl. The adsorption efficiencies were found to be 45.6, 50.8, 81.7, and 99.9%, while the desorption efficiencies reached 66.1, 70.4, 83.9, and 100.0% for C8, C10, C12, and C14, respectively. The concentrations of the AS surfactants in wastewater samples were quantified by CE‐C4D after preconcentration by simultaneous adsorption using Al2O3 beads. The results obtained from the proposed method were consistent with those obtained by HPLC‐MS/MS, with a deviation of less than 15%. Our results indicate that the CE‐C4D performed after preconcentration by an adsorption technique using Al2O3 beads is a new, inexpensive, and suitable method for quantifying AS surfactants in wastewater samples.

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Section: Preconcentration Of As Surfactants By Simultaneous Adsorptiosupporting

confidence: 81%

Separation and determination of alkyl sulfate surfactants in wastewater by capillary electrophoresis coupled with contactless conductivity detection after preconcentration by simultaneous adsorption using alumina beads

et al. 2020

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“…Likewise, the hydrophobic tails of SDBS can incorporate into the interior of TX100 to form mixed hemimicelle/admicelle, which are usually smaller than that of single SDBS and TX100 . As a result, the maximum adsorption capacities of SDBS on ESM are enhanced, which is consistent with the isotherms of other anionic–nonionic surfactants . However, the q m dramatically decreased to 332.97 mg/g when further increased the TX100/SDBS mass ratio to 5:5, suggesting that the presence of excess TX100 have negative effect on the adsorption of SDBS.…”

Section: Resultssupporting

confidence: 64%

Evaluation of a mixed anionic–nonionic surfactant modified eggshell membrane as an advantageous adsorbent for the solid‐phase extraction of Sudan I–IV as model analytes

Liu

Wang

Bai

et al. 2017

J of Separation Science

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The coadsorption of mixed anionic-nonionic surfactants, sodium dodecylbenzenesulfonate with Triton X-100, on the surface of eggshell membrane was investigated based on adsorption isotherms to improve the solid-phase extraction performance of eggshell membrane toward organic contaminants. Results showed that even though excess Triton X-100 might inhibit the adsorption of sodium dodecylbenzenesulfonate, a low dosage of Triton X-100 can significantly improve sodium dodecylbenzenesulfonate modification and enhance the extraction efficiency of eggshell membrane from 73.7 to 100.4% because of the formation of mixed hemimicelles. The highest recovery was achieved at 2:8 (Triton X-100/sodium dodecylbenzenesulfonate mass ratios), and multiple mechanisms involving π-π interactions, hydrophobic effect, and π-π electron donor-acceptor interactions contributed to the strong extraction affinity. When mixed, the Triton X-100 and sodium dodecylbenzenesulfonate modified eggshell membrane packed cartridge coupled with high-performance liquid chromatography was applied for the simultaneous determination of trace Sudan I-IV, and low detection limits (0.16-0.26 ng/L) were achieved with satisfactory linearity (R > 0.999) in 10-10 000 μg/L. For real samples, Sudan II and III in one chilli sauce sample were found at 4.3 and 1.7 μg/kg. Sudan I-IV recoveries at three spiked levels were 87.4-102.9% with precisions <6.8%. Comparison with commonly used solid-phase extraction adsorbents and methods further reflected the superiorities of the proposed adsorbent in sensitivity, retention ability, and applicability.

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“…Herein, we try to interpret our experimental results based on the pseudo phase equilibrium hypothesis, which was widely applied in the description of surfactant aggregation. 43,[61][62][63][64][65][66][67] The equilibrium between the surfactants adsorbed on the polymer IC chains and in the solution may be characterized by…”

Section: Thermodynamic Description Of Adsorption and Micellization Of...mentioning

confidence: 99%

The interactions of ι-carrageenan with cationic surfactants in aqueous solutions

et al. 2014

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The interactions between the anionic polymer ι-carrageenan (IC) and the cationic surfactants 1-dodecyl-3-methylimidazolium bromide (C12mimBr), dodecyltrimethylammonium bromide (DTAB) and ethyl-α,ω-bis(dodecyldimethylammonium)dibromide (12-2-12) have been studied by fluorimetry and isothermal titration calorimetry. Our experimental results showed that at a low surfactant concentration, the monomers adsorbed on the IC chains through the electrostatic attraction, followed by the formation of induced micelles on the IC chains through the hydrophobic interaction until the IC chains are saturated by surfactant molecules; after that the added surfactant formed free micelles in the solution. A pseudo-phase-equilibrium thermodynamic model was proposed to explain the experimental results and to understand the mechanisms of the interactions in these three systems. Moreover, the salt effect on the interactions was investigated and found that it changed the critical concentrations but not the interaction mechanism.

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Thermodynamics of mixed anionic/nonionic surfactant adsorption on alumina

Cited by 19 publications

References 33 publications

Separation and determination of alkyl sulfate surfactants in wastewater by capillary electrophoresis coupled with contactless conductivity detection after preconcentration by simultaneous adsorption using alumina beads

Separation and determination of alkyl sulfate surfactants in wastewater by capillary electrophoresis coupled with contactless conductivity detection after preconcentration by simultaneous adsorption using alumina beads

Evaluation of a mixed anionic–nonionic surfactant modified eggshell membrane as an advantageous adsorbent for the solid‐phase extraction of Sudan I–IV as model analytes

The interactions of ι-carrageenan with cationic surfactants in aqueous solutions

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