Temperature Dependent Catalytic Activity of Ag/PET Ion-Track Membranes Composites

Borgekov, Daryn B.; Mashentseva, Anastassiya A.; Kislitsin, S. B.; Kozlovskiy, Artem L.; Russakova, A.; Zdorovets, Maxim V.

doi:10.12693/aphyspola.128.871

Cited by 19 publications

(12 citation statements)

References 22 publications

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“…The pore size of the original template and the structural parameters of MTs were determined by porometry method using the Hagen-Poiseuille Equation (1) [39],…”

Section: Composite Characterizationmentioning

confidence: 99%

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

et al. 2020

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One of the promising applications of nanomaterials is to use them as catalysts and sorbents to remove toxic pollutants such as nitroaromatic compounds and heavy metal ions for environmental protection. This work reports the synthesis of Cu/CuO-deposited composite track-etched membranes through low-temperature annealing and their application in catalysis and sorption. The synthesized Cu/CuO/poly(ethylene terephthalate) (PET) composites presented efficient catalytic activity with high conversion yield in the reduction of nitro aryl compounds to their corresponding amino derivatives. It has been found that increasing the time of annealing raises the ratio of the copper(II) oxide (CuO) tenorite phase in the structure, which leads to a significant increase in the catalytic activity of the composites. The samples presented maximum catalytic activity after 5 h of annealing, where the ratio of CuO phase and the degree of crystallinity were 64.3% and 62.7%, respectively. The catalytic activity of pristine and annealed composites was tested in the reduction of 4-nitroaniline and was shown to remain practically unchanged for five consecutive test cycles. Composites annealed at 140 °C were also tested for their capacity to absorb arsenic(III) ions in cross-flow mode. It was observed that the sorption capacity of composite membranes increased by 48.7% compared to the pristine sample and reached its maximum after 10 h of annealing, then gradually decreased by 24% with further annealing.

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“…The pore size of the original template and the structural parameters of MTs were determined by porometry method using the Hagen-Poiseuille Equation (1) [39],…”

Section: Composite Characterizationmentioning

confidence: 99%

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

et al. 2020

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“…There has been a significant amount of interest for track-etched membrane (TeMs) in MD. A unique feature of TeMs is the control of the number of pores per unit area [20][21][22][23][24][25], which significantly expands fields of application in sensing [26], catalysis [27][28][29][30][31], lithium-ion batteries [32,33], template synthesis of nanostructures [34][35][36][37][38]. At the present time various types of polymers are known, intended as a material for TeMs.…”

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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Section: Introductionmentioning

confidence: 99%

“…Substituting group 1 Н NMR, ppm, (J/Hz) 13 С NMR, ppm № R 1 R 2 СН-СН NH СН-СН С=О 1 [19] 5.24 7.16 (s. 4H) 64.60 160.30 10a [34,35] CH 10d [34] -CH 2 CH 2 CH 2 CH 2 -7.00 (s. 4Н) 73.60 160.30 10e [34,35] C 6 H 5 C 6 H 5 7.80 (s. 4Н) 81.70 160.60 10f [35] 3-ClC 6 H 4 3-ClC 6 H 4 7.98 (s. 4Н) 81.30 160.40 10g [35] 4-ClC 6 H 4 4-ClC 6 H 4 7.88 (s. 4Н) 81.20 160.30 10h [36] CF 3 CF 3 8.83 (s. 4Н) 77.11 158.27 11a [34,37] CH 11c [34,37] C 6 H 5 C 6 H 5 -79.00 158.00 11d [38] - C,N-Substituted glycolurils. In considering particular cases -compounds 12a-k (Table 9) and 13a-r (Table 10) with a mixed type of N-and C-substitution the 13 C NMR spectra are the most informative for the analysis of electronic properties and conformational changes in the glycoluril framework.…”

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confidence: 99%

Untitled

2020

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

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The use of differential calculation methods for the destruction of copolymers of polyethylene glycol fumarate with the acrylic acid In this work, the thermal decomposition of copolymers based on polyethylene glycol fumarate with the acrylic acid using various ratios of initial monomers has been studied for the first time. The samples were studied in air and nitrogen. According to the thermograms analysis, it was found that the copolymer sample decomposition begins at higher temperatures for a copolymer with high content of polyester resin. The copolymer is vigorously oxidized by the oxygen when heated in air, and one can observe almost complete sample decomposition, whereas it decomposes with a residue of ~15 % in an inert medium. The activation energies for copolymers with different compositions were estimated using the differential methods of Freeman-Carroll, Achar and Sharpe-Wentworth. The activation energy values found by the three methods demonstrated a good convergence. It was shown that, the activation energy values are higher (~200 kJ/mol in the inert medium, and ~95 kJ/mol in the oxygen atmosphere) for a copolymer with a lower composition of polyester resin, and the activation energy is ~180 and ~85 kJ/mol for a copolymer with a greater composition of p-EGF-AA. The copolymer is more thermostable in the nitrogen atmosphere according to the kinetic parameters. Additionally, there were determined the thermodynamic characteristics, such as the Gibbs energy (∆G) and the entropy (∆S). They also confirm the destruction process dependence on the components ratio in the synthesized copolymer.

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Temperature Dependent Catalytic Activity of Ag/PET Ion-Track Membranes Composites

Cited by 19 publications

References 22 publications

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

Phenol solutions treatment by using hydrophobized track-etched membranes

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