Microfiltration of oil emulsions stabilized by different surfactants

Trinh, Thien An; Han, Qi; Ma, Yunqiao; Chew, Jia Wei

doi:10.1016/j.memsci.2019.02.068

Cited by 52 publications

(41 citation statements)

References 57 publications

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“…This highlights that the heterogeneity and different preferential affinities by different amino acid residues causes transient attractive energies, which are not necessarily tied to adsorption. While fouling by more ideal, uniformly charged colloidal foulants tends to agree with simple interaction energy models, 13,71 a mis‐match between interaction energy and extent of membrane fouling has earlier been reported for an experimental study on surfactant stabilized oil emulsions, 72,73 which suggests that local interactions play a dominant role in dictating fouling for more complex foulants 67 …”

Section: Resultsmentioning

confidence: 93%

Membrane fouling by lysozyme: Effect of local interaction

Zydney

Chew

2021

AIChE Journal

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Molecular dynamics simulations were performed to understand the adsorption of positive‐charged lysozyme onto negative‐charged polyvinylidene fluoride membrane at three pH and two ionic strengths. The lysozyme was initialized at six orientations at 10 Å from the membrane and adsorption was deemed to occur when the lysozyme is less than 4 Å from the membrane. Local interactions are clearly important: (i) despite opposite net charges, no adsorption occurs in some cases throughout; (ii) lysozyme‐membrane separation distances differ among the initial orientations of lysozyme; and (iii) the correlation between lysozyme‐membrane interaction energy and adsorption probability is poor. Correspondingly, seven key local adsorption sites on lysozyme were identified. Of the two most common sites, one anchors due to electrostatics, while the other is not electrostatics‐based. Also, different sites are dominant in different feed conditions and have different interaction energies. These results reveal the importance of local interactions in membrane fouling by proteins in different feed conditions.

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Section: Resultsmentioning

confidence: 93%

Membrane fouling by lysozyme: Effect of local interaction

Zydney

Chew

2021

AIChE Journal

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“…Therefore, the modification should be tailored based on the characteristics of oily wastewater to achieve a better filtration performance. Foulants such as surfactants in oily wastewater were found to improve the flux of membranes [114], but were not part of this work. In this section, the modified ceramic membranes studied for oily wastewater treatment are discussed and compared.…”

Section: Performance Of Antifouling Ceramic Membranes For Oily Wastewater Treatmentmentioning

confidence: 99%

State-of-the-Art Ceramic Membranes for Oily Wastewater Treatment: Modification and Application

2021

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Membrane filtration is considered to be one of the most promising methods for oily wastewater treatment. Because of their hydrophilic surface, ceramic membranes show less fouling compared with their polymeric counterparts. Membrane fouling, however, is an inevitable phenomenon in the filtration process, leading to higher energy consumption and a shorter lifetime of the membrane. It is therefore important to improve the fouling resistance of the ceramic membranes in oily wastewater treatment. In this review, we first focus on the various methods used for ceramic membrane modification, aiming for application in oily wastewater. Then, the performance of the modified ceramic membranes is discussed and compared. We found that, besides the traditional sol-gel and dip-coating methods, atomic layer deposition is promising for ceramic membrane modification in terms of the control of layer thickness, and pore size tuning. Enhanced surface hydrophilicity and surface charge are two of the most used strategies to improve the performance of ceramic membranes for oily wastewater treatment. Nano-sized metal oxides such as TiO2, ZrO2 and Fe2O3 and graphene oxide are considered to be the potential candidates for ceramic membrane modification for flux enhancement and fouling alleviation. The passive antifouling ceramic membranes, e.g., photocatalytic and electrified ceramic membranes, have shown some potential in fouling control, oil rejection and flux enhancement, but have their limitations.

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“…Garcia et al [25] experimentally proved that aquatic toxicity of oligomeric cationic surfactants depends on their hydrophobicity and increases regularly with the alkyl chain length; however, whether the surfactant is a dimeric or a trimeric betaine ester does not affect their acute toxicity to crustacean. Trinh et al [26] suggested that the attraction of surfactants to membranes is not related to the extent of membrane fouling but to the magnitude of the repulsive energy.…”

Section: Introductionmentioning

confidence: 99%

Electroreduction of p-Nitrophenol by Surfactant Modified Electrodes

Li¹,

Zhang²,

Xue³

et al. 2019

ACSM

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This paper mainly compares the electroreduction of p-nitrophenol by different surfactantmodified chemical electrodes. Four surfactants were prepared to modify the glassy carbon electrode, including a cationic surfactant (CTAB), an anionic surfactant (SDBS) and two nonionic surfactants (Tween 80, OP-10). Each modified electrode was applied to detect the p-nitrophenol in sodium acetate buffer solution, and the reduction peak current and reduction peak potential of p-nitrophenol were measured by linear sweep voltammetry under different concentrations of each surfactant. The results show that the cationic surfactant reduced the peak current, reaching the optimal effect at the concentration of 2.95×10-4 mol/L; the anionic surfactant and nonionic surfactants reduced the peak current, and the reduction effect depends on the micelle effect of the surfactants and other factors; the cationic surfactant suppressed the reduction peak potential at concentrations of 0 ~ 2×10-4 mol/L, while the other three surfactants cannot reduce the reduction peak potential; the CTAB was proved as the most sensitive material for detecting p-nitrophenol on electrode surface. This research provides a valuable reference for the design of p-nitrophenol sensors.

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Microfiltration of oil emulsions stabilized by different surfactants

Cited by 52 publications

References 57 publications

Membrane fouling by lysozyme: Effect of local interaction

Membrane fouling by lysozyme: Effect of local interaction

State-of-the-Art Ceramic Membranes for Oily Wastewater Treatment: Modification and Application

Electroreduction of p-Nitrophenol by Surfactant Modified Electrodes

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