Hollow TiO<sub>2</sub>/Poly (Vinyl Pyrrolidone) Fibers Obtained via Coaxial Electrospinning as Easy-to-Handle Photocatalysts for Effective Nitrogen Oxide Removal
Herein, we present a method for fabricating hollow TiO<sub>2</sub> microfibers from Ti (OBu)<sub>4</sub>/poly (vinyl pyrrolidone) sol-gel precursors and their effects on denitrification as a photocatalyst for air purification. Various sizes of hollow TiO<sub>2</sub&g...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/22/4942 |
| _version_ | 1797464132006445056 |
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| author | Juran Kim |
| author_facet | Juran Kim |
| author_sort | Juran Kim |
| collection | DOAJ |
| description | Herein, we present a method for fabricating hollow TiO<sub>2</sub> microfibers from Ti (OBu)<sub>4</sub>/poly (vinyl pyrrolidone) sol-gel precursors and their effects on denitrification as a photocatalyst for air purification. Various sizes of hollow TiO<sub>2</sub> fibers were developed using coaxial electrospinning by controlling the core flow rate from 0 to 3 mL h<sup>−1</sup>. At higher flow rates, the wall layer was thinner, and outer and core diameters were larger. These features are correlated with physical properties, including specific surface area, average pore diameter, and crystalline structure. The increase in the core flow rate from 0 to 3 mL h<sup>−1</sup> leads to a corresponding increase in the specific surface area from 1.81 to 3.95 µm and a decrease in the average pore diameter from 28.9 to 11.1 nm. Furthermore, the increased core flow rate results in a high anatase and rutile phase content in the structure. Herein, hollow TiO<sub>2</sub> was produced with an approximately equal content of anatase/rutile phases with few impurities. A flow rate of 3 mL h<sup>−1</sup> resulted in the highest specific surface area of 51.28 m<sup>2</sup> g<sup>−1</sup> and smallest pore diameter size of ~11 nm, offering more active sites at the fiber surface for nitrogen oxide removal of up to 66.2% from the atmosphere. |
| first_indexed | 2024-03-09T18:02:37Z |
| format | Article |
| id | doaj.art-0ae78f67d3604f93a211ddf8b18ced17 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T18:02:37Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-0ae78f67d3604f93a211ddf8b18ced172023-11-24T09:43:32ZengMDPI AGPolymers2073-43602022-11-011422494210.3390/polym14224942Hollow TiO<sub>2</sub>/Poly (Vinyl Pyrrolidone) Fibers Obtained via Coaxial Electrospinning as Easy-to-Handle Photocatalysts for Effective Nitrogen Oxide RemovalJuran Kim0Advanced Textile R&D Department, Republic of Korea Institute of Industrial Technology (KITECH), Ansan 15588, Republic of KoreaHerein, we present a method for fabricating hollow TiO<sub>2</sub> microfibers from Ti (OBu)<sub>4</sub>/poly (vinyl pyrrolidone) sol-gel precursors and their effects on denitrification as a photocatalyst for air purification. Various sizes of hollow TiO<sub>2</sub> fibers were developed using coaxial electrospinning by controlling the core flow rate from 0 to 3 mL h<sup>−1</sup>. At higher flow rates, the wall layer was thinner, and outer and core diameters were larger. These features are correlated with physical properties, including specific surface area, average pore diameter, and crystalline structure. The increase in the core flow rate from 0 to 3 mL h<sup>−1</sup> leads to a corresponding increase in the specific surface area from 1.81 to 3.95 µm and a decrease in the average pore diameter from 28.9 to 11.1 nm. Furthermore, the increased core flow rate results in a high anatase and rutile phase content in the structure. Herein, hollow TiO<sub>2</sub> was produced with an approximately equal content of anatase/rutile phases with few impurities. A flow rate of 3 mL h<sup>−1</sup> resulted in the highest specific surface area of 51.28 m<sup>2</sup> g<sup>−1</sup> and smallest pore diameter size of ~11 nm, offering more active sites at the fiber surface for nitrogen oxide removal of up to 66.2% from the atmosphere.https://www.mdpi.com/2073-4360/14/22/4942photocatalysttitanium dioxidecore-sheath hollow fibersnitrogen oxide removal |
| spellingShingle | Juran Kim Hollow TiO<sub>2</sub>/Poly (Vinyl Pyrrolidone) Fibers Obtained via Coaxial Electrospinning as Easy-to-Handle Photocatalysts for Effective Nitrogen Oxide Removal Polymers photocatalyst titanium dioxide core-sheath hollow fibers nitrogen oxide removal |
| title | Hollow TiO<sub>2</sub>/Poly (Vinyl Pyrrolidone) Fibers Obtained via Coaxial Electrospinning as Easy-to-Handle Photocatalysts for Effective Nitrogen Oxide Removal |
| title_full | Hollow TiO<sub>2</sub>/Poly (Vinyl Pyrrolidone) Fibers Obtained via Coaxial Electrospinning as Easy-to-Handle Photocatalysts for Effective Nitrogen Oxide Removal |
| title_fullStr | Hollow TiO<sub>2</sub>/Poly (Vinyl Pyrrolidone) Fibers Obtained via Coaxial Electrospinning as Easy-to-Handle Photocatalysts for Effective Nitrogen Oxide Removal |
| title_full_unstemmed | Hollow TiO<sub>2</sub>/Poly (Vinyl Pyrrolidone) Fibers Obtained via Coaxial Electrospinning as Easy-to-Handle Photocatalysts for Effective Nitrogen Oxide Removal |
| title_short | Hollow TiO<sub>2</sub>/Poly (Vinyl Pyrrolidone) Fibers Obtained via Coaxial Electrospinning as Easy-to-Handle Photocatalysts for Effective Nitrogen Oxide Removal |
| title_sort | hollow tio sub 2 sub poly vinyl pyrrolidone fibers obtained via coaxial electrospinning as easy to handle photocatalysts for effective nitrogen oxide removal |
| topic | photocatalyst titanium dioxide core-sheath hollow fibers nitrogen oxide removal |
| url | https://www.mdpi.com/2073-4360/14/22/4942 |
| work_keys_str_mv | AT jurankim hollowtiosub2subpolyvinylpyrrolidonefibersobtainedviacoaxialelectrospinningaseasytohandlephotocatalystsforeffectivenitrogenoxideremoval |