Titanium dioxide surface modified with both palladium and fluoride as an efficient photocatalyst for the degradation of urea
DC Field | Value | Language |
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dc.contributor.author | Kim, Hyoung-il | - |
dc.contributor.author | Kim, Kitae | - |
dc.contributor.author | Park, Soona | - |
dc.contributor.author | Kim, Wooyul | - |
dc.contributor.author | Kim, Seungdo | - |
dc.contributor.author | Kim, Jungwon | - |
dc.date.accessioned | 2019-08-23T04:56:36Z | - |
dc.date.available | 2019-08-23T04:56:36Z | - |
dc.date.issued | 2019-06 | - |
dc.identifier.issn | 1383-5866 | - |
dc.identifier.uri | https://repository.kopri.re.kr/handle/201206/9661 | - |
dc.description.abstract | TiO2 surface modified with both Pd nanoparticles and fluorides (F-TiO2/Pd) was prepared and applied as a photocatalyst in the degradation of urea. Various surface analysis techniques, including X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and energy-dispersive X-ray spectroscopy, were used to verify the coexistence of Pd nanoparticles and fluorides on the surface of TiO2 in F-TiO2/Pd. F-TiO2/Pd showed a higher photocatalytic activity than those of bare TiO2 and single-component-modified TiO2 photocatalysts such as fluorinated TiO2 (F-TiO2) and Pd-loaded TiO2 (Pd/TiO2). The higher urea degradation efficiency of F-TiO2/Pd is ascribed to the enhanced production of hydroxyl radicals (●OH) by the synergistic action of the surface Pd and fluoride. Pd nanoparticles and fluorides facilitate the transfer of valence band holes (hvb+) and their reaction with water molecules, respectively, synergistically enhancing the production of ●OH. The photocatalytic activity of F-TiO2/Pd for the degradation of urea increased upon increasing the fraction of the fluorinated TiO2 surface, which is higher at higher fluoride concentrations and lower pH. Although Pt/TiO2 showed higher photocatalytic activity for the degradation of urea than those of Pd/TiO2 and Au/TiO2, the strong positive effect of fluoride complexation was only exhibited by Pd/TiO2 (a slight positive effect and a negative effect were observed for Au/TiO2 and Pt/TiO2, respectively). As a result, the degradation of urea proceeded more rapidly in a UV-irradiated suspension of F-TiO2/Pd than when any of other photocatalysts (i.e., bare TiO2, Pd/TiO2, F-TiO2, Au/TiO2, F-TiO2/Au, Pt/TiO2, and F-TiO2/Pt) were used under the same conditions. The first-order degradation rate constants (k) of urea depending on the type of TiO2 were as follows: 0.097 h?1 for bare TiO2, 0.158 h?1 for Pd/TiO2, 0.151 h?1 for F-TiO2, 0.351 h?1 for F-TiO2/Pd, 0.173 h?1 for Au/TiO2, 0.223 h?1 for F-TiO2/Au, 0.240 h?1 for Pt/TiO2, and 0.165 h?1 for F-TiO2/Pt, respectively. In addition, F-TiO2/Pd proved to be stable in repeated urea degradation cycles. | en_US |
dc.language | English | - |
dc.language.iso | en | en_US |
dc.subject | Engineering | en_US |
dc.subject.classification | 기타() | en_US |
dc.title | Titanium dioxide surface modified with both palladium and fluoride as an efficient photocatalyst for the degradation of urea | en_US |
dc.title.alternative | 산화티타늄 표면개질을 통한 요소분해 연구 | en_US |
dc.type | Article | en_US |
dc.identifier.bibliographicCitation | Kim, Hyoung-il, et al. 2019. "Titanium dioxide surface modified with both palladium and fluoride as an efficient photocatalyst for the degradation of urea". <em>SEPARATION AND PURIFICATION TECHNOLOGY</em>, 209(1): 580-587. | - |
dc.citation.title | SEPARATION AND PURIFICATION TECHNOLOGY | en_US |
dc.citation.volume | 209 | en_US |
dc.citation.number | 1 | en_US |
dc.identifier.doi | 10.1016/j.seppur.2018.07.058 | - |
dc.citation.startPage | 580 | en_US |
dc.citation.endPage | 587 | en_US |
dc.description.articleClassification | SCIE | - |
dc.description.jcrRate | JCR 2017:16.058 | en_US |
dc.subject.keyword | photocatalysis | en_US |
dc.subject.keyword | Titanium dioxide | en_US |
dc.subject.keyword | Palladium loading | en_US |
dc.subject.keyword | Fluoride complexation | en_US |
dc.subject.keyword | Urea degradation | en_US |
dc.identifier.localId | 2018-0112 | - |
dc.identifier.scopusid | 2-s2.0-85051017015 | - |
dc.identifier.wosid | 000449133600064 | - |
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