PHOTOCATALYTIC ACTIVITY OF HIGH-CONCENTRATION TITANIUM DIOXIDE SLURRIES AT NEUTRAL PH
The properties of high-concentration titanium dioxide slurries under UV irradiation were studied for photocatalytic oxidation of contaminants. Commercial nanoparticles of TiO2(Evonik Aeroxide® P25) at concentrations of 0.5, 1, 1.5,2 and 2.5 g L-1 were irradiated by a mercury lamp (254 nm). At neutra...
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| Format: | Article |
| Language: | Spanish |
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CEILAP-UNIDEF-CONICET-CITEDEF
2020-10-01
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| Series: | Anales (Asociación Física Argentina) |
| Subjects: | |
| Online Access: | https://anales.fisica.org.ar/index.php/analesafa/article/view/2280/2638 |
| _version_ | 1797733244676866048 |
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| author | L. del C. Cid C. M. C. Vera P. A. Sorichetti |
| author_facet | L. del C. Cid C. M. C. Vera P. A. Sorichetti |
| author_sort | L. del C. Cid |
| collection | DOAJ |
| description | The properties of high-concentration titanium dioxide slurries under UV irradiation were studied for photocatalytic oxidation of contaminants. Commercial nanoparticles of TiO2(Evonik Aeroxide® P25) at concentrations of 0.5, 1, 1.5,2 and 2.5 g L-1 were irradiated by a mercury lamp (254 nm). At neutral pH, within the studied concentration range, nanoparticles form agglomerates of tens of micrometers. Their size, measured by optical microscopy, increases linearly with catalyst concentration. The attenuation length of the UV radiation was measured by a spectrophotometer with an integrating sphere. The concentration of the model contaminant (Orange II) was determined by spectrophotometry at intervals of 20 minutes, during the irradiation time (6 hours). The measured values fit satisfactorily to a pseudo first order kinetics. At catalyst concentrations of 1 g L−1and higher, the kinetic constant is (8.1±0.5)×10−3min−1. This is explained by the diminution of the attenuation length and the simultaneous increase of the total exposed surface at higher catalyst concentrations. |
| first_indexed | 2024-03-12T12:26:02Z |
| format | Article |
| id | doaj.art-08255b3766fd42edaa83903e919638df |
| institution | Directory Open Access Journal |
| issn | 0327-358X 1850-1168 |
| language | Spanish |
| last_indexed | 2024-03-12T12:26:02Z |
| publishDate | 2020-10-01 |
| publisher | CEILAP-UNIDEF-CONICET-CITEDEF |
| record_format | Article |
| series | Anales (Asociación Física Argentina) |
| spelling | doaj.art-08255b3766fd42edaa83903e919638df2023-08-29T22:43:25ZspaCEILAP-UNIDEF-CONICET-CITEDEFAnales (Asociación Física Argentina)0327-358X1850-11682020-10-013137785https://doi.org/10.31527/analesafa.2020.31.3.77PHOTOCATALYTIC ACTIVITY OF HIGH-CONCENTRATION TITANIUM DIOXIDE SLURRIES AT NEUTRAL PHL. del C. Cid0 C. M. C. Vera1P. A. Sorichetti21Departamento de Química, Facultad de Ingeniería. Universidad de Buenos Aires,Av. Paseo Colón 850 5to Piso (C1063ACV), Buenos Aires, Argentina2GLOMAE . Departamento de Física. Facultad de Ingeniería Universidad de Buenos Aires,Av. Paseo Colón 850 2do Piso (C1063ACV), Buenos Aires, Argentina.Departamento de Química, Facultad de Ingeniería. Universidad de Buenos Aires,Av. Paseo Colón 850 5to Piso (C1063ACV), Buenos Aires, ArgentinaGLOMAE . Departamento de Física. Facultad de Ingeniería Universidad de Buenos Aires,Av. Paseo Colón 850 2do Piso (C1063ACV), Buenos Aires, Argentina.The properties of high-concentration titanium dioxide slurries under UV irradiation were studied for photocatalytic oxidation of contaminants. Commercial nanoparticles of TiO2(Evonik Aeroxide® P25) at concentrations of 0.5, 1, 1.5,2 and 2.5 g L-1 were irradiated by a mercury lamp (254 nm). At neutral pH, within the studied concentration range, nanoparticles form agglomerates of tens of micrometers. Their size, measured by optical microscopy, increases linearly with catalyst concentration. The attenuation length of the UV radiation was measured by a spectrophotometer with an integrating sphere. The concentration of the model contaminant (Orange II) was determined by spectrophotometry at intervals of 20 minutes, during the irradiation time (6 hours). The measured values fit satisfactorily to a pseudo first order kinetics. At catalyst concentrations of 1 g L−1and higher, the kinetic constant is (8.1±0.5)×10−3min−1. This is explained by the diminution of the attenuation length and the simultaneous increase of the total exposed surface at higher catalyst concentrations.https://anales.fisica.org.ar/index.php/analesafa/article/view/2280/2638agglomerationhigh-concentration slurryorange iiphotocatalysistitanium dioxide |
| spellingShingle | L. del C. Cid C. M. C. Vera P. A. Sorichetti PHOTOCATALYTIC ACTIVITY OF HIGH-CONCENTRATION TITANIUM DIOXIDE SLURRIES AT NEUTRAL PH Anales (Asociación Física Argentina) agglomeration high-concentration slurry orange ii photocatalysis titanium dioxide |
| title | PHOTOCATALYTIC ACTIVITY OF HIGH-CONCENTRATION TITANIUM DIOXIDE SLURRIES AT NEUTRAL PH |
| title_full | PHOTOCATALYTIC ACTIVITY OF HIGH-CONCENTRATION TITANIUM DIOXIDE SLURRIES AT NEUTRAL PH |
| title_fullStr | PHOTOCATALYTIC ACTIVITY OF HIGH-CONCENTRATION TITANIUM DIOXIDE SLURRIES AT NEUTRAL PH |
| title_full_unstemmed | PHOTOCATALYTIC ACTIVITY OF HIGH-CONCENTRATION TITANIUM DIOXIDE SLURRIES AT NEUTRAL PH |
| title_short | PHOTOCATALYTIC ACTIVITY OF HIGH-CONCENTRATION TITANIUM DIOXIDE SLURRIES AT NEUTRAL PH |
| title_sort | photocatalytic activity of high concentration titanium dioxide slurries at neutral ph |
| topic | agglomeration high-concentration slurry orange ii photocatalysis titanium dioxide |
| url | https://anales.fisica.org.ar/index.php/analesafa/article/view/2280/2638 |
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