UV and Visible Light-Induced Photocatalytic Efficiency of Polyaniline/Titanium Dioxide Heterostructures
The concept of using polyaniline/titanium dioxide heterostructures as efficient photocatalysts is based on the synergistic effect of conducting polymer and metal oxide semiconductors. Due to inconclusive literature reports, the effect of different polyaniline/TiO<sub>2</sub> ratios on ph...
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2024-12-01
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| author | Yongqiang Fu Marcin Janczarek |
| author_facet | Yongqiang Fu Marcin Janczarek |
| author_sort | Yongqiang Fu |
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| description | The concept of using polyaniline/titanium dioxide heterostructures as efficient photocatalysts is based on the synergistic effect of conducting polymer and metal oxide semiconductors. Due to inconclusive literature reports, the effect of different polyaniline/TiO<sub>2</sub> ratios on photocatalytic activity under UV and visible light was investigated. In most papers, non-recommended dyes are used as model compounds to evaluate visible light activity. Therefore, colorless phenol was used instead of dyes in this study to clarify the real visible light-induced photocatalytic activity of polyaniline/TiO<sub>2</sub> composites. This publication also includes a discussion of whether materials derived from bulk (non-nanostructured) polyaniline and TiO<sub>2</sub> by the standard in situ oxidative polymerization method are suitable candidates for promising photocatalytic materials. The evaluation of photocatalytic activity was performed in both UV and visible light systems. X-ray diffraction and UV-Vis diffuse reflectance spectroscopy methods were applied to characterize the obtained samples. Obtained polyaniline (pure and in composites) was identified as emeraldine salt. In the UV system, none of the prepared samples with different polyaniline–titania ratios had activity better than reference P25 titania. It has been observed that the presence of polyaniline adversely affects the photocatalytic properties, as the polyaniline layer covering the titania surface can shield the UV light transmission by blocking the contact between the TiO<sub>2</sub> surface and organic molecules. In the case of using visible light, no synergies have been observed between polyaniline and titania either. The photodegradation efficiencies of the most active samples were similar to those of pure polyaniline. In conclusion, in order to obtain efficient polyaniline/titania photocatalysts active in UV and/or visible light, it is necessary to take into account the morphological and surface properties of both components. |
| format | Article |
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| spelling | doaj-art-30db85dbaf7b48d69fe6b5a050144e282025-01-10T13:18:38ZengMDPI AGMolecules1420-30492024-12-013012310.3390/molecules30010023UV and Visible Light-Induced Photocatalytic Efficiency of Polyaniline/Titanium Dioxide HeterostructuresYongqiang Fu0Marcin Janczarek1Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, PolandInstitute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, PolandThe concept of using polyaniline/titanium dioxide heterostructures as efficient photocatalysts is based on the synergistic effect of conducting polymer and metal oxide semiconductors. Due to inconclusive literature reports, the effect of different polyaniline/TiO<sub>2</sub> ratios on photocatalytic activity under UV and visible light was investigated. In most papers, non-recommended dyes are used as model compounds to evaluate visible light activity. Therefore, colorless phenol was used instead of dyes in this study to clarify the real visible light-induced photocatalytic activity of polyaniline/TiO<sub>2</sub> composites. This publication also includes a discussion of whether materials derived from bulk (non-nanostructured) polyaniline and TiO<sub>2</sub> by the standard in situ oxidative polymerization method are suitable candidates for promising photocatalytic materials. The evaluation of photocatalytic activity was performed in both UV and visible light systems. X-ray diffraction and UV-Vis diffuse reflectance spectroscopy methods were applied to characterize the obtained samples. Obtained polyaniline (pure and in composites) was identified as emeraldine salt. In the UV system, none of the prepared samples with different polyaniline–titania ratios had activity better than reference P25 titania. It has been observed that the presence of polyaniline adversely affects the photocatalytic properties, as the polyaniline layer covering the titania surface can shield the UV light transmission by blocking the contact between the TiO<sub>2</sub> surface and organic molecules. In the case of using visible light, no synergies have been observed between polyaniline and titania either. The photodegradation efficiencies of the most active samples were similar to those of pure polyaniline. In conclusion, in order to obtain efficient polyaniline/titania photocatalysts active in UV and/or visible light, it is necessary to take into account the morphological and surface properties of both components.https://www.mdpi.com/1420-3049/30/1/23photocatalysistitanium dioxidepolyanilineconducting polymers |
| spellingShingle | Yongqiang Fu Marcin Janczarek UV and Visible Light-Induced Photocatalytic Efficiency of Polyaniline/Titanium Dioxide Heterostructures Molecules photocatalysis titanium dioxide polyaniline conducting polymers |
| title | UV and Visible Light-Induced Photocatalytic Efficiency of Polyaniline/Titanium Dioxide Heterostructures |
| title_full | UV and Visible Light-Induced Photocatalytic Efficiency of Polyaniline/Titanium Dioxide Heterostructures |
| title_fullStr | UV and Visible Light-Induced Photocatalytic Efficiency of Polyaniline/Titanium Dioxide Heterostructures |
| title_full_unstemmed | UV and Visible Light-Induced Photocatalytic Efficiency of Polyaniline/Titanium Dioxide Heterostructures |
| title_short | UV and Visible Light-Induced Photocatalytic Efficiency of Polyaniline/Titanium Dioxide Heterostructures |
| title_sort | uv and visible light induced photocatalytic efficiency of polyaniline titanium dioxide heterostructures |
| topic | photocatalysis titanium dioxide polyaniline conducting polymers |
| url | https://www.mdpi.com/1420-3049/30/1/23 |
| work_keys_str_mv | AT yongqiangfu uvandvisiblelightinducedphotocatalyticefficiencyofpolyanilinetitaniumdioxideheterostructures AT marcinjanczarek uvandvisiblelightinducedphotocatalyticefficiencyofpolyanilinetitaniumdioxideheterostructures |