Partitioning of Dyes, Free Anthraquinones, and Tanshinones in Aqueous Two-Phase Systems of Cationic/Anionic Surfactants

Hao, Li-Sheng; Liu, Meina; Xu, Haimei; Yang, Ning; Nan, Yan‐Qing; Deng, Yao-Tai

doi:10.1080/01932691.2014.950742

Cited by 12 publications

(3 citation statements)

References 31 publications

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Section: Resultsmentioning

confidence: 99%

“…Sudan III partitions to the (more hydrophobic) polymer-rich phase, while E133 partitions to the (less hydrophobic) IL-rich phase. The hydrophobicity/hydrophilicity of these dyes explains the observed partition tendencies: Sudan III is considered an oil-soluble compound, given its octanol/water partition coefficient (log K ow ) of 7.63, 52 while E133 is a hydrophilic dye with a log K ow of −4.94. 53 There is a transition from a monophasic to a biphasic mixture rising the temperature from 25 to 50 °C, further allowing the complete (one-step) separation of both dyes, with 100 and 98% of Sudan III and E133 partitioning to opposite phases, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Double-Stimuli-Responsive (Temperature and pH) Aqueous Biphasic Systems Comprising Ionic Liquids

Rufino

Bola

Capela

et al. 2023

ACS Sustainable Chem. Eng.

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Aqueous biphasic systems (ABS) can integrate multiple unit operations and operate under continuous mode, contributing to the development of sustainable separation processes. Encouraged by the designer solvent features of ionic liquids (ILs), we herein propose their use as components of double-stimuli-responsive (temperature- and pH-driven) ABS. Resorting to choline-alkanoate-based ILs as the pH-responsive components and poly(propylene glycol) (PPG 400) as the thermo-responsive component, the ABS ternary phase diagrams are determined at various temperature (25–45 °C) and pH (3–7) conditions. While the liquid–liquid phase diagram response to temperature obeys a lower critical solution temperature-like behavior, the response to pH correlates with the pK a of the IL anion parent acid. The simultaneous responsiveness to temperature and pH is then shown, whose results inspire the development of customizable separation techniques as proved with the simultaneous (one-step) separation of two dyes. By a proper customization of the IL chemical structure and stimuli applied, ABS may be designed to improve the performance and sustainability of separation processes.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Double-Stimuli-Responsive (Temperature and pH) Aqueous Biphasic Systems Comprising Ionic Liquids

Rufino

Bola

Capela

et al. 2023

ACS Sustainable Chem. Eng.

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show abstract

“…ATPSs have high water content and provide easy phase transition for highly water-soluble hydrophilic compounds that are difficult to extract in conventional systems. ATPSs have been successfully applied to separate and preconcentrate various species, such as biomaterials, dyes, organic compounds, and metal ions [ 38 , 39 , 40 , 41 ]. Such systems are very promising for the extraction of common water-soluble, synthetic, sulfonated dyes.…”

Section: Introductionmentioning

confidence: 99%

Aqueous Two-Phase Systems Based on Cationic and Anionic Surfactants Mixture for Rapid Extraction and Colorimetric Determination of Synthetic Food Dyes

Smirnova

Apyari

2023

Sensors

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In this study, aqueous two-phase systems (ATPSs) containing a cationic and anionic surfactants mixture were used for the preconcentration of the synthetic food dyes Allura Red AC, Azorubine, Sunset Yellow, Tartrazine, and Fast Green FCF. A rapid, simple, low cost, affordable, and environmentally friendly methodology based on microextraction in ATPSs, followed by spectrophotometric/colorimetric determination of the dyes, is proposed. The ATPSs are formed in mixtures of benzethonium chloride (BztCl) and sodium N-lauroylsarcosinate (NaLS) or sodium dihexylsulfosuccinate (NaDHSS) under the molar ratio close to equimolar at the total surfactant concentration of 0.01–0.20 M. The density, viscosity, polarity, and water content in the surfactant-rich phases at an equimolar ratio BztCl:NaA were determined. The effects of pH, total surfactant concentration, dye concentration, and time of extraction/centrifugation were investigated, and the optimum conditions for the quantitative extraction of dyes were established. The smartphone-based colorimetric determination was employed directly in the extract without separating the aqueous phase. The analytical performance (calibration linearity, precision, limits of detection and quantification, reproducibility, and preconcentration factor) and comparison of the spectrophotometric and smartphone-based colorimetric determination of dyes were evaluated. The method was applied to the determination of dyes in food samples and food-processing industrial wastewater.

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UV-responsive micellar systems and aqueous two-phase systems based on cationic ester-containing gemini surfactant and sodium trans-ortho-methoxycinnamate

et al. 2021

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Partitioning of Dyes, Free Anthraquinones, and Tanshinones in Aqueous Two-Phase Systems of Cationic/Anionic Surfactants

Cited by 12 publications

References 31 publications

Double-Stimuli-Responsive (Temperature and pH) Aqueous Biphasic Systems Comprising Ionic Liquids

Double-Stimuli-Responsive (Temperature and pH) Aqueous Biphasic Systems Comprising Ionic Liquids

Aqueous Two-Phase Systems Based on Cationic and Anionic Surfactants Mixture for Rapid Extraction and Colorimetric Determination of Synthetic Food Dyes

UV-responsive micellar systems and aqueous two-phase systems based on cationic ester-containing gemini surfactant and sodium trans-ortho-methoxycinnamate

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