Comparative Study of Four TiO2-Based Photocatalysts to Degrade 2,4-D in a Semi-Passive System
| Autor: | Jordan Hollman, Gisoo Heydari, Cooper H. Langford, Gopal Achari |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
anodization
semi-passive Materials science lcsh:Hydraulic engineering Geography Planning and Development Analytical chemistry 02 engineering and technology Aquatic Science 2 4-D 010402 general chemistry medicine.disease_cause 01 natural sciences Biochemistry chemistry.chemical_compound Planar Light source lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 medicine buoyant catalyst Water Science and Technology Diode lcsh:TD201-500 Anodizing LED 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry mesh Titanium dioxide Photocatalysis Degradation (geology) 0210 nano-technology photocatalysis Ultraviolet |
| Zdroj: | Water, Vol 11, Iss 3, p 621 (2019) Water Volume 11 Issue 3 |
| ISSN: | 2073-4441 |
| Popis: | In this study, the relative efficiency of four forms of supported titanium dioxide (TiO2) as a photocatalyst to degrade 2,4-dichlorophenoxyacetic acid (2,4-D) in Killex® a commercially available herbicide was studied. Coated glass spheres, anodized plate, anodized mesh, and electro-photocatalysis using the anodized mesh were evaluated under an ultraviolet &ndash light-emitting diode (UV-LED) light source at &lambda = 365 nm in a semi-passive mode. Energy consumption of the system was used to compare the efficiency of the photocatalysts. The results showed both photospheres and mesh consumed approximately 80 J/cm3 energy followed by electro-photocatalysis (112.2 J/cm3), and the anodized plate (114.5 J/cm3). Although electro-photocatalysis showed the fastest degradation rate (K = 5.04 mg L&minus 1 h&minus 1), its energy consumption was at the same level as the anodized plate with a lower degradation rate constant of 3.07 mg L&minus 1. The results demonstrated that three-dimensional nanotubes of TiO2 surrounding the mesh provide superior degradation compared to one-dimensional arrays on the planar surface of the anodized plate. With limited broad-scale comparative studies between varieties of different TiO2 supports, this study provides a comparative analysis of relative degradation efficiencies between the four photocatalytic configurations. |
| Databáze: | OpenAIRE |
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