Direct Optical Research Methods in the Analytics of Phenol

Aluker, N. L.; Lavrentieva, A. L.; Suzdaltseva, Ya. M.

doi:10.1134/s0030400x20030042

Cited by 9 publications

(6 citation statements)

References 3 publications

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“…5) in the region of 230 nm and increase in the region of 250 and more than 300 nm indicates the active degradation of BPA and formation of transformation products under the action of an electron beam. A weak change in the intensity of the bands in the region of 270−280 nm indicates that phenols [12] of various structures are accumulating in the solution, which are supposed products of BPA decomposition. The curve at 3200 pulses proves complete degradation of the substance under study.…”

Section: Resultsmentioning

confidence: 99%

Luminescent studies of bisphenol A solutions under the action of the electron beam

O.N.

E.N.

G.V.

et al. 2022

Optics and Spectroscopy

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The results of measuring the luminescence of ambient air and solutions of an organic compound during their irradiation with a high-current pulsed electron beam with an average energy of Ee=170 keV and a duration of 2 ns, generated by the RADAN-303 accelerator, are presented. It is shown that, under such exposure, the transformation of dissolved bisphenol A occurs, which is accompanied by an increase in the absorption coefficient of the solution in the wavelength range of more than 300 nm and, as a consequence, a decrease in the intensity of air luminescence bands with an increase in the number of irradiation pulses. The results showed the degradation of the BPA solution to complete decomposition under the action of an electron beam treatment. Keywords: electron beam, air, solutions of organic compounds, luminescence, absorption, decomposition.

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Section: Resultsmentioning

confidence: 99%

Luminescent studies of bisphenol A solutions under the action of the electron beam

O.N.

E.N.

G.V.

et al. 2022

Optics and Spectroscopy

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“…Phenol concentrations were determined using a calibration graph using the optical densities of the solution at a phenol absorption wavelength of 270 nm. In the UV spectra, the absorption bands of phenol are as follows: 210 (ε = 6200 L/mol•cm) and 270 nm (ε = 1450 L/mol•cm) [49][50][51][52][53][54][55][56][57]. The dependence of optical density on phenol concentration obeys the Bouguer-Lambert-Beer law in the plateau region at 270-280 nm.…”

Section: Methodsmentioning

confidence: 95%

Catalysts Based on Nanoscale Iron and Cobalt Immobilized on Polymers for Catalytic Oxidation of Aromatic Hydrocarbons: Synthesis, Physico-Chemical Studies, and Tests of Catalytic Activity

Dossumova,

Sassykova,

Shakiyeva

et al. 2023

Processes

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It is known that highly efficient catalysts for the catalytic oxidation of aromatic hydrocarbons can be obtained based on magnetic nanoparticles. The development of nanosized magnetically controlled catalysts for the oxidation of aromatic hydrocarbons with oxygen deserves especially close attention in the territory of the Republic of Kazakhstan, which does not have its own industrial production of oxygen-containing compounds. The aim of this work is to create catalysts based on Fe and Co nanoparticles stabilized with polymers: polyvinylpyrrolidone, chitosan, and polyethylenimine, study them by methods of physico-chemical research, and conduct preliminary tests of catalysts to predict their effectiveness. Magnetic nanoparticles were prepared by the co-precipitation method. Based on the results of the SEM analysis, it was concluded that polymers form composites together with metal nanocrystals. According to preliminary data, the most efficient oxidation of phenol in a non-flowing glass gradient-free thermostated duck-type reactor occurs on Fe3O4/chitosan, with the phenol conversion being 55–60%. Tests on the oxidation of phenol with oxygen showed a favorable prognosis for the use of such catalysts for the oxidative conversion of aromatic hydrocarbons in order to obtain valuable intermediates.

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“…As can be seen from Figure 8, the optical density of the reaction product is reduced compared to the initial solution. In the IR spectrum of the product, absorption bands in the region of 1644 cm −1 are characteristic of the vibrations of the C=O bonds of the carbonyl group of benzoquinone, and the detected peaks at 1353 cm −1 and 1229 cm −1 can be related to the vibrations of the C-H and C-C bonds of the quinone ring [65][66][67][68][69][70]. As can be seen from Figure 8, the optical density of the reaction product is reduced compared to the initial solution.…”

Section: Catalysts Testing In the Oxidation Reactionmentioning

confidence: 99%

Catalysts Based on Iron Oxides for Wastewater Purification from Phenolic Compounds: Synthesis, Physicochemical Analysis, Determination of Catalytic Activity

Dossumova,

Sassykova,

Shakiyeva

et al. 2024

ChemEngineering

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In this work, the synthesis of magnetite nanoparticles and catalysts based on it stabilized with silicon and aluminum oxides was carried out. It is revealed that the stabilization of the magnetite surface by using aluminum and silicon oxides leads to a decrease in the size of magnetite nanocrystals in nanocomposites (particle diameter less than ~10 nm). The catalytic activity of the obtained catalysts was evaluated during the oxidation reaction of phenol, pyrocatechin and cresol with oxygen. It is well known that phenolic compounds are among the most dangerous water pollutants. The effect of phenol concentration and the effect of temperature (303–333 K) on the rate of oxidation of phenol to Fe3O4/SiO2 has been studied. It has been determined that the dependence of the oxidation rate of phenol on the initial concentration of phenol in solution is described by a first-order equation. At temperatures of 303–313 K, incomplete absorption of the calculated amount of oxygen is observed, and the analysis data indicate the non-selective oxidation of phenol. Intermediate products, such as catechin, hydroquinone, formic acid, oxidation products, were found. The results of UV and IR spectroscopy showed that catalysts based on magnetite Fe3O4 are effective in the oxidation of phenol with oxygen. In the UV spectrum of the product in the wavelength range 190–1100 nm, there is an absorption band at a wavelength of 240–245 nm and a weak band at 430 nm, which is characteristic of benzoquinone. In the IR spectrum of the product, absorption bands were detected in the region of 1644 cm−1, which is characteristic of the oscillations of the C=O bonds of the carbonyl group of benzoquinone. The peaks also found at 1353 cm−1 and 1229 cm−1 may be due to vibrations of the C-H and C-C bonds of the quinone ring. It was found that among the synthesized catalysts, the Fe3O4/SiO2 catalyst demonstrated the greatest activity in the reaction of liquid-phase oxidation of phenol.

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Direct Optical Research Methods in the Analytics of Phenol

Cited by 9 publications

References 3 publications

Luminescent studies of bisphenol A solutions under the action of the electron beam

Luminescent studies of bisphenol A solutions under the action of the electron beam

Catalysts Based on Nanoscale Iron and Cobalt Immobilized on Polymers for Catalytic Oxidation of Aromatic Hydrocarbons: Synthesis, Physico-Chemical Studies, and Tests of Catalytic Activity

Catalysts Based on Iron Oxides for Wastewater Purification from Phenolic Compounds: Synthesis, Physicochemical Analysis, Determination of Catalytic Activity

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