Janus membrane decorated <i>via</i> a versatile immersion-spray route: controllable stabilized oil/water emulsion separation satisfying industrial emission and purification criteria

Zhang, Weifeng; Li, Xiangyu; Qu, Ruixiang; Liu, Yanan; Wei, Yen; Feng, Lin

doi:10.1039/c8ta11452h

Cited by 90 publications

(39 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, membrane processes are considered a suitable and low-cost alternative to the conventional techniques for treatment of oilfield wastewater, due to unique properties such as the simples process, low energy consumption and no phase transformation [6,7]. Recent studies have reported the use of polymeric membranes for oily wastewater treatment [8][9][10]. Zhang, B. et al [11] reported the use of a polytetrafluoroethylene (PTFE) membrane for the study of the mechanisms of adsorption fouling of crude oil.…”

Section: Introductionmentioning

confidence: 99%

Polymer-Based Membranes for Oily Wastewater Remediation

et al. 2019

View full text Add to dashboard Cite

The compounds found in industrial wastewater typically show high toxicity, and in this way, they have become a primary environmental concern. Several techniques have been applied in industrial effluent remediation. In spite of the efforts, these techniques are yet to be ineffective to treat oily wastewater before it can be discharged safely to the environment. Membrane technology is an attractive approach to treat oily wastewater. This is dedicated to the immobilisation of TiO2 nanoparticles on poly(vinylidene fluoride–trifluoro ethylene) (PVDF-TrFE) porous matrix by solvent casting. Membranes with interconnected pores with an average diameter of 60 µm and a contact angle of 97°, decorated with TiO2 nanoparticles, are obtained. The degradation of oily wastewater demonstrated the high photocatalytic efficiency of the nanocomposite membranes: Under sunlight irradiation for seven hours, colourless water was obtained.

show abstract

Section: Introductionmentioning

confidence: 99%

Polymer-Based Membranes for Oily Wastewater Remediation

et al. 2019

View full text Add to dashboard Cite

show abstract

“…This substrate‐dependent issue could be addressed to some extent through the single‐side spraying technique. [ 71–78 ] The modifier solution is atomized with an airbrush for this method, and the fog droplets are accelerated to directionally impact the membrane surface. The further penetration of the modifier solution due to the capillary effect is to some extent reduced because of the very rapid spray process (in seconds) and comparative fog drop size with membrane pores.…”

Section: Asymmetric Surface Construction and Regulation For Janus Memmentioning

confidence: 99%

Asymmetric Surface Engineering for Janus Membranes

Yang

2020

Adv Materials Inter

View full text Add to dashboard Cite

Emerging Janus membranes, named after the ancient Roman god with two faces to better survey both the past and the future, are appealing materials to tackle this challenge. They possess opposing chemicophysical properties on two sides for achieving a breakthrough in their performances. [12] The opposite surface properties usually include asymmetric wettability and charge but not limited to them. [13] Janus membranes with asymmetric wettable surfaces have received most of the attention in diverse research fields for a wide variety of applications because of their distinctive mass (e.g., liquid or gas) transport behaviors in two-phase or multiphase systems. Such unique fluid transportation relies on the cooperative effect arisen from the asymmetric wettability in the direction of membrane thickness. [14] Therefore, how to create and regulate asymmetry is a core task in the preparation of Janus membranes.Surface engineering, a process for modifying the surface of a material, provides a powerful toolbox to enhance and optimize the performance of the material, especially for porous membranes with large internal surface area. A myriad of modification methods including surface coating, grafting, and self-assembling have been developed to regulate membrane surface properties which are usually uniform in the spatial distribution. As distinguished from ordinary surface treatments, asymmetric surface engineering aims to accurately control the uneven distribution of surface properties or functionalities in the direction of membrane thickness, being an effective means for the preparation of Janus membranes.Benefiting from the asymmetric surface engineering, the researches on Janus membranes have mushroomed in recent years. Hundreds of literatures have explored the possibilities for Janus membranes to substitute traditional ones for achieving enhanced performances in the mass transfer between two phases, including water−oil, water−gas, and oil−gas systems. Some researchers have reviewed the research progresses on Janus membranes from different perspectives. Our previous review has discussed the definition and fabrication of Janus membranes and summarized their applications in the field of environmental science. [13] Another two reviews, presented by Zhao et al. [14] and Zhou et al., [15] have described the distinctive unidirectional fluid transport phenomenon of Janus membranes and their functional applications. Besides, a recent review has detailed the potential of Janus configuration in terms of enhancing energy efficiency in membrane processes. [12] However, the vital role of asymmetric surface engineering in the construction of asymmetric configurations, the modulation of surface properties, and the implementation of ultimate applications has not been addressed. Herein, Janus membranes show great promise toward various applications and are undergoing a fast-paced development in materials science. The asymmetric surface engineering on surface wettability, layer thickness, and pore structure enables Janus membranes with super...

show abstract

“…Compared with conventional membrane materials, the existence of "diode" phenomenon makes Janus membrane achieve higher separation e ciency and selectivity in oil/water separation (Li et al 2016;Wang et al 2017b). Such a "smart" property of Janus membrane with double-sided asymmetric property indicates great promise not only for oil/water separation (Liu et al 2017b(Liu et al , 2020Wang et al 2017a;An et al 2018;Lin et al 2019;Yao et al 2019;Zhang et al 2019;Zuo et al 2020)but also for water collection (Gao et al 2018), functional textiles (Dai et al 2019;Wang et al 2020), and other eld (Li et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Asymmetrically Wettability Janus Cotton Fabrics Fabricated via Interfacial Ion Migration for Surfactant-stabilized Oil-in-water Emulsions

et al. 2021

Preprint

View full text Add to dashboard Cite

Separation of surfactant-stabilized oil-water emulsions seems to be challenging owing to its diverse repercussions on environment and human life. The asymmetrical wettability Janus cotton fabric (J-MH@CF) with high separation performance was prepared by two-step method, which related to interfacial ion migration technology and unilateral spraying treatment. In detail, the immobilization of magnesium hydroxide (Mg(OH)2) caused the formation of the rough micro/nanostructure of cotton fabric surface, which was helpful to superhydrophilic property. Stearic acid as a coating created the unilateral superhydrophobic surface with low surface energy. J-MH@CF showed asymmetric wettability, featuring diode-like directional water transmission. Wettability, directional transmission and separation performance of J-MH@CF membrane were investigated systematically. The asymmetric wettability architecture was demonstrated to play a key role in separating surfactant-stabilized oil-in-water emulsions. Impressingly, the separation performance was not affected by the type of surfactants. For emulsion stabilized by sodium dodecyl sulfate (SDS), the separation flux driven by gravity was approximately 500 L m-2h-1, and all separation efficiencies were over 99.3%. CTAB/Oil/H2O emulsion and the Tween-60/Oil/H2O emulsion also could be successfully separated with high separation efficiency and separation flux. During the whole separation process, the oil droplets surrounded by surfactants (Oil-Ss) were difficult to demulsify and gathered on the surface of the fabric to form a "creamy layer", which was beneficial to improve separation efficiency and could be cleaned off so that J-MH@CF membrane was not contaminated. In addition, the J-MH@CF membrane exhibited robust reusability for separation, which was promising for remediation of oily wastewater containing surfactants.

show abstract

Janus membrane decorated via a versatile immersion-spray route: controllable stabilized oil/water emulsion separation satisfying industrial emission and purification criteria

Abstract: A PANI–SiNP-decorated Janus membrane was fabricated for highly efficient stabilized oil-in-water and water-in-oil emulsion separation, meeting industrial purification standards.

Cited by 90 publications

References 35 publications

Polymer-Based Membranes for Oily Wastewater Remediation

Polymer-Based Membranes for Oily Wastewater Remediation

Asymmetric Surface Engineering for Janus Membranes

Asymmetrically Wettability Janus Cotton Fabrics Fabricated via Interfacial Ion Migration for Surfactant-stabilized Oil-in-water Emulsions

Contact Info

Product

Resources

About