Janus sand filter with excellent demulsification ability in separation of surfactant-stabilized oil/water emulsions: An experimental and molecular dynamics simulation study

Yan, Yuanyang; Zeng, Xinjuan; Yang, Kangquan; Zhou, Peng; Xu, Shanhui; Pi, Pihui; Li, Hao; Fang, Jing; Wang, Shengnian; Wen, Xiufang

doi:10.1016/j.jhazmat.2021.126346

Cited by 43 publications

(5 citation statements)

References 64 publications

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“…Compared with different types of demulsifying materials, 3H-SSFF has the significant advantages of excellent separation efficiency and high processing flux, while the emulsified oil droplets can be effectively demulsified and recovered (Figure h). ,− The 3H-SSFF promotes the oil droplet coalescence through the extrusion of the fluid with the interaction between oil droplets and hydrophobic surface. Herein, the energy source of destabilization of the emulsions by our approach is the kinetic energy of the fluid that provided by the pump and the interaction energy between oil molecules and hydrophobic interface.…”

Section: Resultsmentioning

confidence: 99%

Sequential Demulsification through the Hydrophobic-Hydrophilic-Hydrophobic Filtration Layer toward High-Performing Oil Recovery

Li,

Zhang,

Liu

et al. 2023

Environ. Sci. Technol.

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Demulsification using membranes is a promising method to coalesce highly stable emulsified oil droplets for oil recovery. Nevertheless, a structure of the current filtration medium that is not efficient for oil droplet coalescence impedes rapid permeability, thereby inevitably restricting their practical applications. Herein, we report a hydrophobic-hydrophilic-hydrophobic (3H) demulsification medium that exhibits a benchmark permeability of ∼2.1 × 10 4 L m −2 h −1 with a demulsification efficiency of >98.0%. Remarkably, this 3H demulsification medium maintains over 90% demulsification efficiency in the oil-in-water (O/W) emulsions with a wide range of surfactant concentrations, which shows excellent applicability. Based on the combined results of quasi situ microscope images and molecular dynamics simulations, we show that the polydimethylsiloxane-modified hydrophobic layer facilitates the capture and coalescence of oil droplets, the hydrophilic inner layer assists in squeezing the coalescence of enlarged droplets, and the third hydrophobic layer accelerates the discharge of demulsified oil to sustain permeability. The sequential demulsification mechanism between this 3H filtration layer provides a general guide for designing a demulsifying membrane with high demulsification efficiency and high flux toward oil recovery.

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Section: Resultsmentioning

confidence: 99%

Sequential Demulsification through the Hydrophobic-Hydrophilic-Hydrophobic Filtration Layer toward High-Performing Oil Recovery

Li,

Zhang,

Liu

et al. 2023

Environ. Sci. Technol.

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“…The filtration separation of emulsion has a key problem, that is, demulsification [45]. Demulsification ability is the key to separating oil and water in emulsion.…”

Section: Mechanism Of Underoil Superhydrophilicity and On-demand Emul...mentioning

confidence: 99%

Underoil superhydrophilic flame-retardant 3D porous composite for efficient on-demand emulsion separation: Interface engineering design on sphagnum moss

Guo,

Liu,

Zhang

et al. 2024

Friction

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Oil pollution and the energy crisis make oil-water separation an urgent for human need. The widespread use of materials with a single emulsion separation capability is limited. Multifunctional on-demand separation materials can adapt to a wide range of application scenarios, thus having a wider range of applications. The underoil superhydrophilic surface is of great significance for realizing the on-demand separation of oil/water emulsions through the removal of water in the oil and oil in the water. A 3D porous emulsion separation material based on the superhydrophilic principle of sphagnum moss was designed. The material was prepared in a simple step by taking advantage of the adhesion of polydopamine and the introduction of the as-prepared superhydrophilic BaSO4 nanoparticles to achieve superhydrophilicity with a water contact angle (WCA) of 0° and an oil contact angle (OCA) of 157.3°, resulting in excellent separation performance for both water-in-oil and oil-in-water emulsions. Underoil superhydrophilic porous composite (OSPC) can complete two kinds of emulsion separations by filtration or adsorption. It adsorbs water from water-in-oil emulsion to achieve separation, with a good adsorption capacity of 74.38 g/g and efficiency up to 99%. It can also filter oil-in-water emulsions with an efficiency of 99.92%. The separation efficiencies are all almost unchanged after ten separation cycles. Furthermore, the material has excellent flame retardancy, which reduces the possibility of secondary disasters. The three-dimensional porous sponge has excellent on-demand separation performance for multiple emulsions. It provides a new preparation strategy for underoil superhydrophilic materials and a new idea for the design direction of special wetting materials for the on-demand separation of oil/water emulsions.

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“…The treated water could be brought into various uses such as household works and agriculture. Very recently, Yan et al [6] investigated the performance of superhydrophilic and superhydrophobic quartz sand filters with Janus channels in the separation of surfactant stabilized oil-in-water and water-in-oil emulsions. Based on computational and experimental studies, they concluded that the Janus channels in the mixed sand layer give better demulsification capability and separation performance, due to high interaction energy with emulsified oil droplets.…”

Section: Sand Filtersmentioning

confidence: 99%

Recent Advances in Functional Materials for Wastewater Treatment: From Materials to Technological Innovations

Khan

Tabasi

Liu

et al. 2022

JMSE

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The growing concerns about climate changes and environmental pollution have galvanized considerable research efforts in recent years to develop effective and innovative remediation technologies for contaminated soils and water caused by industrial and domestic activities. In this context, the establishment of effective treatment methods for wastewater has been critically important and urgent, since water pollution can take place on a very large scale (e.g., oceanic oil spills) and have massive impacts on ecosystems and human lives. Functional materials play a central role in the advancement of these technologies due to their highly tunable properties and functions. This article focuses on reviewing the recent progress in the application of various functional materials for wastewater treatment. Our literature survey is first concentrated on new modification methods and outcomes for a range of functional materials which have been actively investigated in recent years, including biofilm carriers, sand filters, biomass, biopolymers, and functional inorganic materials. Apart from the development of modified functional materials, our literature survey also covers the technological applications of superhydrophilic/superhydrophobic meshes, hybrid membranes, and reusable sponges in oil–water separation. These devices have gained significantly enhanced performance by using new functional materials as the key components (e.g., coating materials), and are therefore highly useful for treatment of oily wastewater, such as contaminated water collected from an oil spill site or oil–water emulsions resulting from industrial pollution. Based on our state-of-the-art literature review, future directions in the development and application of functional materials for wastewater treatment are suggested.

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Janus sand filter with excellent demulsification ability in separation of surfactant-stabilized oil/water emulsions: An experimental and molecular dynamics simulation study

Cited by 43 publications

References 64 publications

Sequential Demulsification through the Hydrophobic-Hydrophilic-Hydrophobic Filtration Layer toward High-Performing Oil Recovery

Sequential Demulsification through the Hydrophobic-Hydrophilic-Hydrophobic Filtration Layer toward High-Performing Oil Recovery

Underoil superhydrophilic flame-retardant 3D porous composite for efficient on-demand emulsion separation: Interface engineering design on sphagnum moss

Recent Advances in Functional Materials for Wastewater Treatment: From Materials to Technological Innovations

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