Photoinduced superwetting membranes for separation of oil-in-water emulsions

Yue, Rengyu; Guan, Jing; Zhang, Chun-Miao; Yuan, Peng-Cheng; Liu, Linna; Afzal, Muhammad Zaheer; Wang, Shuguang; Sun, Xiaohua

doi:10.1016/j.seppur.2020.116536

Cited by 41 publications

(7 citation statements)

References 25 publications

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“…The presence of nanocomposites can be beneficial for the flux and anti‐fouling properties until an optimal amount from which it can start to jeopardize membrane performance, for example, by reducing hydrophilicity, enlarging pore size, reducing rejection rate, increasing fouling layer, reducing flux, etc 106,197,198,200 Membrane regeneration can be almost complete as it was observed in most of the cited studies, because flux recovery was often ~100%, even after several cycles 155,191,199,200,202–204 Photocatalytic properties are often characterized by dye (e.g., methylene blue) decomposition, due to its relatively fast degradation and the relative ease of the analytic method, as it can be measured by a spectrophotometer.…”

Section: Discussionmentioning

confidence: 99%

“…Photocatalytic experiments achieve ~90% dye degradation in most of the referenced studies 202,205–207 Simultaneously applied photocatalysis and filtration have some technical problems that need to be studied in detail, such as the distance between the light source and the membrane, the wavelength of the used light, and the optimal treatment time for the efficient decomposition of organic matter before its filtration 202–205 Both membrane hydrophilicity and membrane oleophobicity have to be studied in depth in order to (a) prevent the permeation of oil droplets, (b) selectively separate water from the oil‐water mixtures, and (c) minimize the adhesion of the oil droplets 133,208 …”

Section: Discussionmentioning

confidence: 99%

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Photocatalytic membrane filtration and its advantages over conventional approaches in the treatment of oily wastewater: A review

Santos

László

Hodúr

et al. 2020

Asia-Pacific J Chem Eng

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Clean water supply has become one of the biggest challenges of the 21st century; therefore, water source protection is of increasing importance. Beyond environmental protection reasons, economic concerns-derived from increasing costs of processing water and wastewater discharge-also prompt industries to use advanced wastewater treatment methods, which ensure higher purification efficiency or even the recycling of water. Therefore, highly effective treatment of oily wastewaters has become an urgent necessity because they are produced in high quantities and have harmful effects on both the environment and human population. However, high purification efficiency can be difficult to achieve, because some compounds are hard to eliminate. Conventional methods are effective for the removal of floating and dispersed oil, but for finely dispersed, emulsified and dissolved oil advanced methods must be used, such as membrane filtration which exhibits several advantages. The application of this technology is restricted by fouling-the major limiting factor-which jeopardizes the membrane performance. In order to reduce fouling, in-depth research is being conducted to make the treatment of oilcontaminated water technically and economically feasible. The present work aims to review the conventional oil separation methods with their limitations and to focus on membrane filtration, which ensures significantly higher purification efficiencies, including the main problem: the flux reduction caused by fouling. This paper also discusses promising solutions, such as membrane modification methods, mostly with hydrophilic and/or photocatalytic nanoparticles and nanocomposites, overviewing the efforts that are being made to develop feasible technologies to treat oil-contaminated waters.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Photocatalytic membrane filtration and its advantages over conventional approaches in the treatment of oily wastewater: A review

Santos

László

Hodúr

et al. 2020

Asia-Pacific J Chem Eng

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“…The gigantic petroleum exploration and production are creating a huge marine environmental crisis, threatening the lives and well-being of people and other species. − The spilled oil often reaches the shoreline, resulting from the push of the winds and currents. Oil forms thick layers and covers beaches that serve as homes to a sea of wildlife and provide public recreation throughout the world .…”

Section: Introductionmentioning

confidence: 99%

“…can produce1 O 2 via combining with H + , • OH, or h + as in eqs 10−12 11,13,72. These highly reactive species subsequently degrade oil pollutants, and the dissociation of hydrogen peroxide (H 2 O 2 ) may occur rapidly according to eqs 13-14.…”

mentioning

confidence: 99%

Two Birds with One Stone: A Dual-Functional Washing Fluid for Shoreline Oil Spill Response

Yue,

Ye,

Zhang

et al. 2023

ACS EST Eng.

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The gigantic petroleum exploration and production are threatening the lives and well-being of people and other species. Pizeocatalysis is a bridge to transfer ceaseless mechanical energy to chemical energy and thus triggers redox reactions. In this study, piezoelectric MoS2 was used as a surface-washing fluid to physically and chemically decontaminate oiled sands. The MoS2 displayed single- and few-layer structures, which were conducive to piezocatalysis. The addition of MoS2 could decrease the interfacial tension, thereby facilitating oil removal. The oil removal efficiency varied under different environmental conditions. Quenching experiments with different scavengers and electron paramagnetic resonance (EPR) spectra showed the existence of reactive oxygen species (ROS) including 1O2, •O2 –, and •OH. It was found that shaking was a necessary initiator to trigger piezocatalysis and singlet oxygen (1O2) was the dominant ROS. The MoS2 fluid exhibited good stability, maintaining high removal efficiency after five reuse cycles. Notably, results indicated that high-molecular-weight hydrocarbons were degraded into lower-molecular-weight ones, indicating the existence of chemical oxidation pathways in oil removal. This study provides a facile self-powered piezocatalytic surface-washing process by harnessing natural energy from water agitation to clean up oiled sands.

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“…It is well known that the oil-resistance property of the water-removing membranes depends on the hydrated layer on its surface, which acts as an isolation to avoid oil directly contacting with the membrane surface. − The oil-resistance property of the membranes will be better if the water-retention layer on the membrane surface is more stable. As a consequence, increasing the stability of the water-retention layer on the membrane surface is of great significance in improving the oil-resistance property and reducing membrane fouling problems.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Anti-Oil-Fouling Hierarchical Structured Membranes Decorated with Urchin-Like α-FeOOH Particles for Efficient Oil/Water Mixture and Crude Oil-in-Water Emulsion Separation

Yin

Zhu

Chi

et al. 2020

ACS Appl. Mater. Interfaces

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Designing and constructing a stable water-retention layer acting as the isolation between the oil and membrane surface holds great significance for solving the membrane fouling problems in oil/water separation, including common layered oil/water mixtures, immiscible oil-in-water emulsions, and even high-viscosity crude oil-in-water emulsions. Inspired by the self-cleaning property of sea urchin thorns, a bioinspired anti-oil-fouling hierarchically structured membranes decorated with urchin-like α-FeOOH particles was successfully prepared via the layer-by-layer (LBL) self-assembly method, maintaining numerous effective micro-nanopores. The hierarchical structured membrane exhibited superior superhydrophilicity/underwater superoleophobicity, high water-retention ability, and preferable anti-oil-fouling properties. Furthermore, the biomimetic membrane with controllable pore sizes could not only separate common layered oil/water mixtures but also effectively separate immiscible surfactant-stabilized oil-in-water emulsions of both low-viscosity crude oil and high-viscosity crude oil with an ultrahigh water flux up to 2598.4 L m–2 h–1 and an outstanding separation efficiency of 98.5%, revealing its promising prospect in oily wastewater treatment.

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Photoinduced superwetting membranes for separation of oil-in-water emulsions

Cited by 41 publications

References 25 publications

Photocatalytic membrane filtration and its advantages over conventional approaches in the treatment of oily wastewater: A review

Photocatalytic membrane filtration and its advantages over conventional approaches in the treatment of oily wastewater: A review

Two Birds with One Stone: A Dual-Functional Washing Fluid for Shoreline Oil Spill Response

Bioinspired Anti-Oil-Fouling Hierarchical Structured Membranes Decorated with Urchin-Like α-FeOOH Particles for Efficient Oil/Water Mixture and Crude Oil-in-Water Emulsion Separation

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