A smart membrane with antifouling capability and switchable oil wettability for high-efficiency oil/water emulsions separation

Cai, Yahui; Chen, Dongyun; Li, Najun; Xu, Qingfeng; Li, Hua; He, Jinghui; Lu, Jianmei

doi:10.1016/j.memsci.2018.03.042

Cited by 90 publications

(39 citation statements)

References 42 publications

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“…Therefore, efficient elimination of oily pollutants is of utmost importance both from environmental and human health aspects. Accordingly, the development of efficient methods to treat oily wastewater has great interest, and the widespread application of such effective treatments is expected in the future (Cai et al 2018;Wu et al 2018;Yang et al 2019;Yu et al 2015). To meet the stringent emission limits, combined methods must be used, including one or more conventional technique(s) such as skimming (Stewart and Arnold 2009), sand filtration (Hong and Xiao 2013;Zaneti et al 2011), centrifugation (Cambiella et al 2006), flotation (Al-Shamrani et al 2002;Rubio et al 2002), adsorption (Boleydei et al 2018), or chemical destabilization (Rodriguez Boluarte et al 2016;Zaneti et al 2011;Zolfaghari et al 2016), augmented with advanced oxidation processes (Hong and Xiao 2013;Rodriguez Boluarte et al Responsible editor: Suresh Pillai 2016) and/or membrane filtration (Fakhru'l-Razi et al 2009;Matos et al 2016;Padaki et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Intensification of the ultrafiltration of real oil-contaminated (produced) water with pre-ozonation and/or with TiO2, TiO2/CNT nanomaterial-coated membrane surfaces

Veréb

Kassai

Santos

et al. 2020

Environ Sci Pollut Res

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In the present study, commercial PES, PVDF, PTFE ultrafilter membranes, and two different nanomaterial (TiO 2 and TiO 2 /CNT composite)-covered PVDF ultrafilter membranes (MWCO = 100 kDa) were used for the purification of an industrial oilcontaminated (produced) wastewater, with and without ozone pretreatment to compare the achievable fouling mitigations by the mentioned surface modifications and/or pre-ozonation. Fluxes, filtration resistances, foulings, and purification efficiencies were compared in detail. Pre-ozonation was able to reduce the total filtration resistance in all cases (up to 50%), independently from the membrane material. During the application of nanomaterial-modified membranes were by far the lowest filtration resistances measured, and in these cases, pre-ozonation resulted in a slight further reduction (11-13%) of the total filtration resistance. The oil removal efficiency was 83-91% in the case of commercial membranes and > 98% in the case of modified membranes. Moreover, the highest fluxes (301-362 L m −2 h −1) were also measured in the case of modified membranes. Overall, the utilization of nanomaterial-modified membranes was more beneficial than pre-ozonation, but with the combination of these methods, slightly higher fluxes, lower filtration resistances, and better antifouling properties were achieved; however, preozonation slightly decreased the oil removal efficiency.

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Section: Introductionmentioning

confidence: 99%

Intensification of the ultrafiltration of real oil-contaminated (produced) water with pre-ozonation and/or with TiO2, TiO2/CNT nanomaterial-coated membrane surfaces

Veréb

Kassai

Santos

et al. 2020

Environ Sci Pollut Res

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“…To date, several technologies for oil/water separation have been developed, including gravity separation, membrane separation, chemical decomposition, and so on [5][6][7]. However, complex preparation steps, poor selectivity, and expensive costs have limited their practical application.…”

Section: Introductionmentioning

confidence: 99%

Modification of Polyurethane Sponge Based on the Thiol–Ene Click Reaction and Its Application for Oil/Water Separation

et al. 2019

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A polyurethane (PU) sponge with hydrophobic/oleophilic property was prepared based on the thiol-ene click reaction, which was a simple method with only one step. Photopolymerization was induced through UV light on the sponge surface in a homogeneous solution containing polyethylene glycol diacrylate, pentaerythritol (mercaptoacetic acid) ester, 2-hydroxy-4 -(2-hydroxyethoxy)-2methylpropiophenone, and octadecyl methacrylate. The as-prepared sponge possessed excellent selective for oil from various types of oil/water mixtures. It also had a high absorption capacity for toluene, >21 times its self-weight, and it had about 20 times its self-weight for vegetable oil, even after five extrusion-adsorption cycles, presenting a good recyclability. It created a new method to prepare oil/water separation sponge.

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“…Developed initially for softening of surface and ground water [3], today, these membranes are used for many other applications, one of which is treating oily wastewaters. There are many sources of oily wastewater, the largest being from oil and gas production operations [4]. Depending on the source of the oily wastewater, many other contaminants can be present such as dissolved salts, surfactants, polar organic compounds, etc.…”

Section: Introductionmentioning

confidence: 99%

Oil Deposition on Polymer Brush-Coated NF Membranes

Mark

Ramon

et al. 2019

Membranes

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Membrane-based processes are attractive for treating oily wastewaters. However, membrane fouling due to the deposition of oil droplets on the membrane surface compromises performance. Here, real-time observation of the deposition of oil droplets by direct confocal microscopy was conducted. Experiments were conducted in dead-end and crossflow modes. Base NF 270 nanofiltration membranes as well as membranes modified by grafting poly(N-isopropylacrylamide) chains from the membrane surface using atom transfer radical polymerization were investigated. By using feed streams containing low and high NaCl concentrations, the grafted polymer chains could be induced to switch conformation from a hydrated to a dehydrated state, as the lower critical solution temperature for the grafted polymer chains moved above and below the room temperature, respectively. For the modified membrane, it was shown that switching conformation of the grafted polymer chains led to the partial release of adsorbed oil. The results also indicate that, unlike particles such as polystyrene beads, adsorption of oil droplets can lead to coalescence of the adsorbed oil droplets on the membrane surface. The results provide further evidence of the importance of membrane properties, feed solution characteristics, and operating mode and conditions on membrane fouling.

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A smart membrane with antifouling capability and switchable oil wettability for high-efficiency oil/water emulsions separation

Cited by 90 publications

References 42 publications

Intensification of the ultrafiltration of real oil-contaminated (produced) water with pre-ozonation and/or with TiO2, TiO2/CNT nanomaterial-coated membrane surfaces

Intensification of the ultrafiltration of real oil-contaminated (produced) water with pre-ozonation and/or with TiO2, TiO2/CNT nanomaterial-coated membrane surfaces

Modification of Polyurethane Sponge Based on the Thiol–Ene Click Reaction and Its Application for Oil/Water Separation

Oil Deposition on Polymer Brush-Coated NF Membranes

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