Catalysts Based on Iron Oxides for Wastewater Purification from Phenolic Compounds: Synthesis, Physicochemical Analysis, Determination of Catalytic Activity
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...
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MDPI AG
2024-01-01
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| Online Access: | https://www.mdpi.com/2305-7084/8/1/8 |
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| author | Binara T. Dossumova Larissa R. Sassykova Tatyana V. Shakiyeva Dinara Muktaly Aigul A. Batyrbayeva Madina A. Kozhaisakova |
| author_facet | Binara T. Dossumova Larissa R. Sassykova Tatyana V. Shakiyeva Dinara Muktaly Aigul A. Batyrbayeva Madina A. Kozhaisakova |
| author_sort | Binara T. Dossumova |
| collection | DOAJ |
| description | 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 Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub> 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 Fe<sub>3</sub>O<sub>4</sub> 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<sup>−1</sup>, which is characteristic of the oscillations of the C=O bonds of the carbonyl group of benzoquinone. The peaks also found at 1353 cm<sup>−1</sup> and 1229 cm<sup>−1</sup> 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 Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub> catalyst demonstrated the greatest activity in the reaction of liquid-phase oxidation of phenol. |
| first_indexed | 2024-03-07T22:37:54Z |
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| id | doaj.art-a9c9dbfc580841d5867af676b247e0b1 |
| institution | Directory Open Access Journal |
| issn | 2305-7084 |
| language | English |
| last_indexed | 2024-03-07T22:37:54Z |
| publishDate | 2024-01-01 |
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| spelling | doaj.art-a9c9dbfc580841d5867af676b247e0b12024-02-23T15:12:02ZengMDPI AGChemEngineering2305-70842024-01-0181810.3390/chemengineering8010008Catalysts Based on Iron Oxides for Wastewater Purification from Phenolic Compounds: Synthesis, Physicochemical Analysis, Determination of Catalytic ActivityBinara T. Dossumova0Larissa R. Sassykova1Tatyana V. Shakiyeva2Dinara Muktaly3Aigul A. Batyrbayeva4Madina A. Kozhaisakova5Al-Farabi Kazakh National University, Almaty 050040, KazakhstanFaculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty 050040, KazakhstanAl-Farabi Kazakh National University, Almaty 050040, KazakhstanAl-Farabi Kazakh National University, Almaty 050040, KazakhstanFaculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty 050040, KazakhstanDepartment of Chemistry, Chemical Technology and Ecology, Almaty Technological University, Almaty 050012, KazakhstanIn 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 Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub> 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 Fe<sub>3</sub>O<sub>4</sub> 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<sup>−1</sup>, which is characteristic of the oscillations of the C=O bonds of the carbonyl group of benzoquinone. The peaks also found at 1353 cm<sup>−1</sup> and 1229 cm<sup>−1</sup> 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 Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub> catalyst demonstrated the greatest activity in the reaction of liquid-phase oxidation of phenol.https://www.mdpi.com/2305-7084/8/1/8catalystsmagnetitealuminium oxidesilicon oxideoxygenoxidation |
| spellingShingle | Binara T. Dossumova Larissa R. Sassykova Tatyana V. Shakiyeva Dinara Muktaly Aigul A. Batyrbayeva Madina A. Kozhaisakova Catalysts Based on Iron Oxides for Wastewater Purification from Phenolic Compounds: Synthesis, Physicochemical Analysis, Determination of Catalytic Activity ChemEngineering catalysts magnetite aluminium oxide silicon oxide oxygen oxidation |
| title | Catalysts Based on Iron Oxides for Wastewater Purification from Phenolic Compounds: Synthesis, Physicochemical Analysis, Determination of Catalytic Activity |
| title_full | Catalysts Based on Iron Oxides for Wastewater Purification from Phenolic Compounds: Synthesis, Physicochemical Analysis, Determination of Catalytic Activity |
| title_fullStr | Catalysts Based on Iron Oxides for Wastewater Purification from Phenolic Compounds: Synthesis, Physicochemical Analysis, Determination of Catalytic Activity |
| title_full_unstemmed | Catalysts Based on Iron Oxides for Wastewater Purification from Phenolic Compounds: Synthesis, Physicochemical Analysis, Determination of Catalytic Activity |
| title_short | Catalysts Based on Iron Oxides for Wastewater Purification from Phenolic Compounds: Synthesis, Physicochemical Analysis, Determination of Catalytic Activity |
| title_sort | catalysts based on iron oxides for wastewater purification from phenolic compounds synthesis physicochemical analysis determination of catalytic activity |
| topic | catalysts magnetite aluminium oxide silicon oxide oxygen oxidation |
| url | https://www.mdpi.com/2305-7084/8/1/8 |
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