Removal and recovery of a cationic surfactant from its aqueous solution by foam fractionation

Kumar, Awadh Kishor; Rawat, Neha; Ghosh, Pallab

doi:10.1016/j.jece.2019.103555

Cited by 10 publications

(4 citation statements)

References 47 publications

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“…Overall, these results indicate that the molar ratio of RBB KN-R and DTAB in the precipitate was much higher than 1:1, corresponding to a small amount of DTAB, thus confirming the conjecture from Figure 7 and the results in Figures 8B and 9A. In addition, the DTAB in the supernatant could be recovered by foam fractionation for reuse [46][47][48].…”

Section: Ftirsupporting

confidence: 84%

“…These results suggest that only a small number of DTAB molecules participated in the insoluble aggregation of RBB KN-R. Furthermore, we used the method for measuring the CTAB concentration reported by Kumar et al [46] to detect the DTAB concentration in the supernatant. Then, the molar ratio of RBB KN-R vs. DTAB in the precipitate was calculated as 1: 0.14 (±0.01), corresponding to a DTAB mass ratio of 7.5 ± 0.5%. )…”

Section: Ftirmentioning

confidence: 95%

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Role of Alkyl Chain Length in Surfactant-Induced Precipitation of Reactive Brilliant Blue KN-R

Liu,

Chang,

et al. 2024

Molecules

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To develop a cost-effective method for the effective removal of reactive brilliant blue KN-R (RBB KN-R) from wastewater, we investigated the interactions between RBB KN-R and three cationic surfactants with different alkyl chain lengths, namely dodecyltrimethylammonium bromide (DTAB), tetradecyltrimethylammonium bromide (TTAB), and cetyltrimethylammonium bromide (CTAB). Employing a conductivity analysis, surface tension analysis, ultraviolet-visible spectrophotometry, and molecular dynamics simulation, we ascertained that RBB KN-R formed a 1:1 molar ratio dye–surfactant complex with each surfactant through electrostatic attraction. Notably, an augmentation in alkyl chain length correlated with increased binding strength between RBB KN-R and the surfactant. The resulting dye–surfactant complex exhibited heightened surface activity, enabling interactions through hydrophobic forces to generate dye–surfactant aggregates when the molar ratio was below 1:1. Within these mixed aggregates, self-assembly of RBB KN-R molecules occurred, leading to the formation of dye aggregates. Due to the improved hydrophobicity with increased alkyl chain length, TTAB and CTAB could encapsulate dye aggregates within the mixed aggregates, but DTAB could not. The RBB KN-R aggregates tended to distribute on the surface of the RBB KN-R-DTAB mixed aggregates, resulting in low stability. Thus, at a DTAB concentration lower than CMC, insoluble particles readily formed and separated from surfactant aggregates at an RBB KN-R and DTAB molar ratio of 1:4. Analyzing the RBB KN-R precipitate through scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) and measuring the DTAB concentration in the supernate revealed that, at this molar ratio, all RBB KN-R precipitated from the dye–surfactant mixed solution, with only 7.5 ± 0.5% of DTAB present in the precipitate. Furthermore, the removal ratio of RBB KN-R reached nearly 100% within a pH range of 1.0 to 9.0 and standing time of 6 h. The salt type and concentration did not significantly affect the precipitation process. Therefore, this simultaneous achievement of successful RBB KN-R removal and effective separation from DTAB underscores the efficacy of the proposed approach.

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Section: Ftirsupporting

confidence: 84%

Section: Ftirmentioning

confidence: 95%

Role of Alkyl Chain Length in Surfactant-Induced Precipitation of Reactive Brilliant Blue KN-R

Liu,

Chang,

et al. 2024

Molecules

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“…Surfactant properties in liquid solutions and foams are the main driving forces for foam fractionation separations, alongside the hydrodynamics of gas–liquid flow and the mass transfer kinetics. In other words, the chemical structure of surfactants (i.e., cationic, anionic, and non-ionic) may significantly control foam fractionation performances. − For example, highly hydrophobic molecules are adsorbed strongly on bubble surfaces and removed from the foam phase . Surfactant molecular size also influences surfactant removal since smaller molecules are more concentrated on bubble surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…In other words, the chemical structure of surfactants (i.e., cationic, anionic, and non-ionic) may significantly control foam fractionation performances. 13 − 15 For example, highly hydrophobic molecules are adsorbed strongly on bubble surfaces and removed from the foam phase. 16 Surfactant molecular size also influences surfactant removal since smaller molecules are more concentrated on bubble surfaces.…”

Section: Introductionmentioning

confidence: 99%

Model for Investigating Relationships between Surfactant Micropollutant Properties and Their Separation from Liquid in a Bubble Column

et al. 2023

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The removal of surfactant micropollutants, such as dyes, pharmaceuticals, and proteins, through foam is very important in biotechnology and wastewater treatment. The literature shows that previous models consider mass balances within the foam but not the adsorption dynamics of micropollutant surfactants on bubble surfaces in the liquid solution. Thus, the main objective of this work is to examine the removal of surfactant micropollutants in a bubble column considering both mass balance and adsorption dynamics to calculate surfactant transport from the liquid bulk to the bubble surface. This allows investigation of the relationships between surfactant hydrophobicity and surfactant separation efficiency from the liquid. It was found that the removal of the surfactant strongly depends on the dynamic adsorption behavior of surfactant on bubble surfaces, and the highest foam fractionation performance was achieved when the surfactant molecule was highly hydrophobic. This work demonstrates that the adsorption dynamics rather than adsorption thermodynamics on bubble surfaces is critical when modeling the removal of surfactant micropollutants from water solutions.

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Treatment of surfactant wastewater by foam separation: Combining the RSM method and WOA-BP neural network to explore optimal process conditions

Liang

Sun

Zeng

et al. 2023

Chemical Engineering Research and Design

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Removal and recovery of a cationic surfactant from its aqueous solution by foam fractionation

Cited by 10 publications

References 47 publications

Role of Alkyl Chain Length in Surfactant-Induced Precipitation of Reactive Brilliant Blue KN-R

Role of Alkyl Chain Length in Surfactant-Induced Precipitation of Reactive Brilliant Blue KN-R

Model for Investigating Relationships between Surfactant Micropollutant Properties and Their Separation from Liquid in a Bubble Column

Treatment of surfactant wastewater by foam separation: Combining the RSM method and WOA-BP neural network to explore optimal process conditions

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