Hydrophobization of PET track-etched membranes for direct contact membrane distillation

Korolkov, Ilya V.; Yeszhanov, Arman B.; Gorin, Yevgeniy G.; Zdorovets, Maxim V.; Khlebnikov, N. A.; Serkov, Konstantin

doi:10.1088/2053-1591/aacc39

Cited by 20 publications

(15 citation statements)

References 55 publications

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“…[33] Therefore, the effects of PFDTS concentration on the contact angle of FL-BP/PFDTS are investigated (Figure 3). Usually, the amphiphobic properties of the functionalized surface are greatly affected by the amount of fluorinated surfactant.…”

Section: Resultsmentioning

confidence: 99%

Robust Amphiphobic Few‐Layer Black Phosphorus Nanosheet with Improved Stability

Liu

Bai

et al. 2019

Advanced Science

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Few‐layer black phosphorus (FL‐BP) has been intensively studied due to its attractive properties and great potential in electronic and optoelectronic applications. However, the intrinsic instability of FL‐BP greatly limits its practical application. In this study, the amphiphobic FL‐BP is achieved by functionalization of 1H,1H,2H,2H‐perfluorooctyltrichlorosilane (PFDTS) on the surface of FL‐BP. The obtained PFDTS coated FL‐BP (FL‐BP/PFDTS) demonstrates enhanced stability, which is not observed during significant degradation for 2 months in high moisture content environment (95% humidity). Particularly, attributing to the surface amphiphobicity, FL‐BP/PFDTS exhibits strong surface water repellency in the presence of oleic acid (as the contaminant), while other passivation coating layers (such as hydrophilic or hydrophobic coating) become hydrophilicity under such conditions. Owing to this advantage, the obtained FL‐BP/PFDTS demonstrates enhanced stability in high moisture content environment for 2 months, even though the surface is contaminated by oil liquid or other organic solvents (such as oleic acid, CH2Cl2, and N‐methyl‐2‐pyrrolidone). The passivation of FL‐BP by amphiphobic coating provides an effective approach for FL‐BP stabilization toward future applications.

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Section: Resultsmentioning

confidence: 99%

Robust Amphiphobic Few‐Layer Black Phosphorus Nanosheet with Improved Stability

Liu

Bai

et al. 2019

Advanced Science

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“…Regular geometry of the pores with the ability to control their amount per unit area and excellent distribution of pore sizes together with low thickness and tortuosity make track-etched membranes (TeMs) attractive for application in precise separation methods (He and Guo, 2015;Korolkov et al, 2018bKorolkov et al, , 2017. The most frequently used ion-track membranes are based on poly(ethylene terephthalate) (PET) (Kurakhmedov et al, 2017;Apel et al, 2018;Filippova et al, 2016;Korolkov et al, 2019Korolkov et al, , 2018cWang et al, 2018). As mentioned above, for membrane distillation it is important that the membrane should possess hydrophobic properties.…”

Section: Introductionmentioning

confidence: 99%

“…The most common method of hydrophobization is to cover the surface by hydrophobic layer. In our previous work, hydrophobic PET films were obtained by covalent bonding of silicon monomers such as dichlorodimethylsilane (Korolkov et al, 2018c) and UV-induced graft polymerization of styrene (Korolkov et al, 2019) TEVS in presents of acrylic acid and N-vinylimidazole (Korolkov et al, 2018a). In the last work, the hydrophilic nature of acrylic acid did not allow to obtain large contact angle of PET TeMs.…”

Section: Introductionmentioning

confidence: 99%

Liquid low-level radioactive wastes treatment by using hydrophobized track-etched membranes

Zdorovets

Yeszhanov

Korolkov

et al. 2020

Progress in Nuclear Energy

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In this paper, we present the results of liquid low-level radioactive wastes (LLLRW) treatment by direct contact membrane distillation (DCMD) using polyethylene terephthalate (PET) track-etched membranes (TeMs). PET TeMs were modified by styrene and triethoxyvinylsilane (TEVS) using UV-induced grafting. Modification led to increase in the contact angle to 99°of PET TeMs (pore size from 150 to 300 nm). Hydrophobic PET TeMs were investigated by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), goniometric analysis, gas permeability test, liquid entry presser (LEP) analysis and scanning electron microscope (SEM). Prepared membranes were tested in treatment of LLLRW by DCMD. The influence of pore size on water flux and rejection degree was studied. Rejection degree was evaluated by conductometry and atomic emission methods. Decontamination factors (evaluated by gamma-ray spectroscopy) for 60 Co, 137 Cs, and 241 Am were found to be 85, 1900 and 5 respectively. In most cases degree of rejection of Cs, Mo, Sr, Sb, Al, Ca, Fe, K, Mg and Na ions were more than 90% and close to 100%. The use of TeMs with a narrow pores size distribution and without tortuous channels allowed us to achieve better purification from radioactive wastes in comparison with hollow-fiber membranes.

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“…However, for the MD process, this type of membrane requires a significant expansion of its hydrophobic characteristics. PET TeMs were hydrophobized and used for purification of saline solutions [13,39] and liquid low-level radioactive wastes treatment [22,40] by DCMD.…”

Section: Introductionmentioning

confidence: 99%

Phenol solutions treatment by using hydrophobized track-etched membranes

Yeszhanov¹,

Dosmagambetova²

2020

Bull. of the Kar. Univ. "Chem". Ser.

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Phenols are one of the most common surface water pollution. The discharge of phenolic waters into water bodies and streams sharply degrade their general sanitary condition, since these compounds have a toxic effect, and phenols can intensively absorb oxygen dissolved in water, which negatively affects the life of organisms in water bodies. Therefore, water treatment of phenols is an important environmental problem. In this study, the hydrophobic polyethylene terephthalate track-etched membranes (PET TeMs) were tested in water treatment from phenol by direct contact membrane distillation (DCMD). Hydrophobic PET TeMs were obtained by UV-graft polymerization of styrene, triethoxyvinylsilane with the addition of vinylimidazole (VIM), as well as by coating with fluorine-containing silanes. Scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy and liquid entry pressure (LEP) analysis were used for membrane characterization. The contact angle after modification of PET TeMs was reached more than 130°. The efficiency of water purification from phenol was evaluated by water-flux measurements and fluorimetric method. The phenols solution was used at a concentration of 0.5, 1 and 2 g/l. The largest permeate flux of hydrophobized membranes was 1.1 kg/ m2•h.

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Hydrophobization of PET track-etched membranes for direct contact membrane distillation

Cited by 20 publications

References 55 publications

Robust Amphiphobic Few‐Layer Black Phosphorus Nanosheet with Improved Stability

Robust Amphiphobic Few‐Layer Black Phosphorus Nanosheet with Improved Stability

Liquid low-level radioactive wastes treatment by using hydrophobized track-etched membranes

Phenol solutions treatment by using hydrophobized track-etched membranes

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