Cationic surfactants influencing the enhancement of energy efficiency for perfluorooctanoic acid (PFOA) removal in the electrocoagulation-flotation (ECF) system

Li, Yueh-Feng; Fang, Ting; Lee, Yu‐Chi; Liu, Yu-Jung; Hu, Ching-Yao; Lo, Shang‐Lien

doi:10.1016/j.chemosphere.2023.137932

Cited by 9 publications

(3 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kishimoto et al claimed that the molar dose of CTAB required to form mixed micelles should be equal or higher than the molar concentration of PFOS, which is the case for this work (CTAB:PFOS/PFOA = 6:1) . The reported molar ratio of CTAB and PFOS/PFOA varies from 1:1 to 20:1, and the optimal ratio might depend strongly on water chemistry such as the ionic strength. ,, The salt (sodium chloride or sodium carbonate) concentrations in those studies are in the range of 2.5–10 mM (around 3 mM in this work for reference). It is important to note that the critical micelle concentrations (CMCs) for single surfactant micelles of PFOS and CTAB are 8 and 0.9 mM, respectively, and their concentrations in this work were below their CMCs; thus, the formation of single surfactant micelles (CTAB micelles or PFOS micelles) does not occur.…”

Section: Resultsmentioning

confidence: 78%

“…According to Stellner and co-workers, a mixture of cationic and anionic surfactants can be assembled as mixed micelles . Mixed micelles exhibit spherical amphiphilic structures containing a hydrophobic core and a hydrophilic shell. − The latter makes the micelle water soluble, thus limiting its removal from the bulk liquid during bubbling. A schematic of a mixed micelle structure for PFOS/PFOA and CTAB is shown in Figure a.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

PFAS–CTAB Complexation and Its Role on the Removal of PFAS from a Lab-Prepared Water and a Reverse Osmosis Reject Water Using a Plasma Reactor

Li,

Isowamwen,

Ross

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

Electrical discharge plasma reactors with argon bubbling can effectively treat long-chain perfluoroalkyl acids (PFAAs) in contaminated water, and the addition of a cationic surfactant cetrimonium bromide (CTAB) is known to enhance the removal of short-chain PFAAs. However, the roles of PFAA chain length, functional group, and water matrix properties on PFAA–CTAB complexation are largely unknown. This work investigated the bulk liquid removal of different PFAAs by CTAB in the absence of plasma. Stepwise addition of CTAB was subsequently used to efficiently treat PFAAs in a lab-prepared water and a reverse osmosis (RO) reject water using an enhanced contact plasma reactor. The results show that CTAB inhibited the bulk liquid removal of long-chain PFAAs in the absence of plasma likely due to the formation of hydrophilic CTAB-PFAA mixed micelles and competition for interfacial access between long-chain PFAAs and CTAB. On the contrary, CTAB enhanced the removal of short- and ultrashort-chain PFAAs by forming hydrophobic complexes. After 6 h of treatment in the plasma reactor with CTAB, PFAAs were 86 to >99% removed from the lab-prepared water and 29 to >99% removed from the RO reject water. This study provides important insights for overcoming mass transfer limitations for PFAA treatment technologies.

show abstract

Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

PFAS–CTAB Complexation and Its Role on the Removal of PFAS from a Lab-Prepared Water and a Reverse Osmosis Reject Water Using a Plasma Reactor

Li,

Isowamwen,

Ross

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Tey carry positively charged ions on their hydrophilic head and can frmly adsorb on the contaminants with negatively charged groups via charge-charge or electrostatic interactions. Te chosen surface-active agents in this experiment work better by providing good solubility and foamability when compared with other types, thereby increasing the fotation efciency better by decreasing CMC formation [27][28][29][30][31][32]. Figure 2 explains the mechanism model of the surface-active agents that tend to be connected with contaminants.…”

Section: Selection Of Surface-active Agentsmentioning

confidence: 99%

Effective Removal of Ibuprofen from Aqueous Solution Using Cationic Surface-Active Agents in Dissolved Air-Flotation Process

Pooja,

Senthil Kumar,

Chitra

et al. 2024

International Journal of Chemical Engineering

View full text Add to dashboard Cite

This research paper focuses on the removal of the nonsteroidal anti-inflammatory drug, ibuprofen, from an aqueous solution using a dissolved air flotation process. The comparison of different types of cationic surface-active agents such as cetyltrimethyl ammonium bromide (CTAB), tetrabutyl ammonium bromide (TBAB), and octyltrimethyl ammonium bromide (OTAB) have been employed to scrutinize the effective removal of the ecotoxic pharmaceutically active compound. The work included the influencing parameters such as pressure, contact time, surfactant dosage, pH, flow rate, and initial concentration owing to the best-optimized conditions. The maximum removal rate of 96.09% was achieved at 15 min for CTAB, TBAB had 62.36% at 45 min, and 89.6% was obtained for OTAB at 30 min, with 50 mg L−1 as the initial concentration and pH = 4. The removal rate was better with the optimized dosage of CTAB at 0.6 g, TBAB at 1.2 g, and OTAB at 1.0 g. It was observed that the geometric shape of the surface-active agents had greater impacts on the contaminants’ efficiency. CTAB and OTAB were combined to find out the best possible removal rate of contaminants. The synergistic effect augments surfactant-based occurrence to be better in forming a good foaming effect and tends to have a lower critical micelle concentration (CMC). From the evaluation of kinetic models, pseudo-second-order flotation kinetics fitted the experimental data best. Furthermore, the formed metabolites that had been identified using gas chromatography-mass spectrometry were found to be less toxic than the parenting compounds.

show abstract

Influence study of cationic surfactant, temperature, and current on the electrocoagulation process for removal of Remazol Red RB 133 by central composite design and response surface methodology

da Silva,

Crisóstomo,

da Silva

et al. 2024

J Solid State Electrochem

View full text Add to dashboard Cite

Cationic surfactants influencing the enhancement of energy efficiency for perfluorooctanoic acid (PFOA) removal in the electrocoagulation-flotation (ECF) system

Cited by 9 publications

References 57 publications

PFAS–CTAB Complexation and Its Role on the Removal of PFAS from a Lab-Prepared Water and a Reverse Osmosis Reject Water Using a Plasma Reactor

PFAS–CTAB Complexation and Its Role on the Removal of PFAS from a Lab-Prepared Water and a Reverse Osmosis Reject Water Using a Plasma Reactor

Effective Removal of Ibuprofen from Aqueous Solution Using Cationic Surface-Active Agents in Dissolved Air-Flotation Process

Influence study of cationic surfactant, temperature, and current on the electrocoagulation process for removal of Remazol Red RB 133 by central composite design and response surface methodology

Contact Info

Product

Resources

About