Porous Layered Double Hydroxide/TiO<sub>2</sub> Photocatalysts for the Photocatalytic Degradation of Orange II
Layered Double Hydroxide (LDH)/TiO<sub>2</sub> nanocomposites with photocatalytic properties were synthesized by both impregnation and the direct coprecipitation of LDH matrices using a colloidal suspension of TiO<sub>2</sub> nanoparticles. While the two methods led to an eff...
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MDPI AG
2020-06-01
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| Series: | ChemEngineering |
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| Online Access: | https://www.mdpi.com/2305-7084/4/2/39 |
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| author | Rodrigue Djeda Gilles Mailhot Vanessa Prevot |
| author_facet | Rodrigue Djeda Gilles Mailhot Vanessa Prevot |
| author_sort | Rodrigue Djeda |
| collection | DOAJ |
| description | Layered Double Hydroxide (LDH)/TiO<sub>2</sub> nanocomposites with photocatalytic properties were synthesized by both impregnation and the direct coprecipitation of LDH matrices using a colloidal suspension of TiO<sub>2</sub> nanoparticles. While the two methods led to an efficient TiO<sub>2</sub> nanoparticle immobilization, the direct coprecipitation allowed us to tune the amount of immobilized TiO<sub>2</sub> within the materials. The LDH/TiO<sub>2</sub> nanocomposites obtained were deeply characterized by chemical analysis (ICP-AES), Powder X-ray diffraction (XRD), Fourier Transformed Infra-Red (FTIR), Thermogravimetric analysis (TGA), and High-Resolution Transmission Electron Microscopy (HRTEM). Clearly, the immobilization of TiO<sub>2</sub> by direct coprecipitation promoted a modification of the textural properties and a net increase in the surface area. The crystallized TiO<sub>2</sub> nanoparticles can be distinctly visualized by HRTEM at the surface of the layered material. Several parameters, such as the nature of the chemical composition of LDH (ZnAl and MgAl), the method of immobilization and the amount of TiO<sub>2</sub>, were shown to play a crucial role in the physicochemical and photocatalytic properties of the nanocomposites. The photocatalytic efficiency of the different LDH/TiO<sub>2</sub> nanocomposites was investigated using the photodegradation of a model pollutant, the Orange II (OII), and was compared to a pure TiO<sub>2</sub> colloidal solution. The degradation tests revealed that the nanocomposite obtained from MgAl LDH at a low MgAl LDH/TiO<sub>2</sub> ratio was the most efficient for the photodegradation of OII leading to complete mineralization in 48 h. |
| first_indexed | 2024-03-10T19:14:52Z |
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| language | English |
| last_indexed | 2024-03-10T19:14:52Z |
| publishDate | 2020-06-01 |
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| record_format | Article |
| series | ChemEngineering |
| spelling | doaj.art-46101a9e01ae485aa5f305878c8a3a3c2023-11-20T03:27:19ZengMDPI AGChemEngineering2305-70842020-06-01423910.3390/chemengineering4020039Porous Layered Double Hydroxide/TiO<sub>2</sub> Photocatalysts for the Photocatalytic Degradation of Orange IIRodrigue Djeda0Gilles Mailhot1Vanessa Prevot2UFR Environnement, Département de Chimie Informatique Mathématiques et Physique, Université Jean Lorougnon Guédé, BP 150 Daloa, Cote d’IvoireInstitut de chimie de Clermont-Ferrand (ICCF), Université Clermont Auvergne, CNRS, Sigma Clermont, F-63000 Clermont-Ferrand, FranceInstitut de chimie de Clermont-Ferrand (ICCF), Université Clermont Auvergne, CNRS, Sigma Clermont, F-63000 Clermont-Ferrand, FranceLayered Double Hydroxide (LDH)/TiO<sub>2</sub> nanocomposites with photocatalytic properties were synthesized by both impregnation and the direct coprecipitation of LDH matrices using a colloidal suspension of TiO<sub>2</sub> nanoparticles. While the two methods led to an efficient TiO<sub>2</sub> nanoparticle immobilization, the direct coprecipitation allowed us to tune the amount of immobilized TiO<sub>2</sub> within the materials. The LDH/TiO<sub>2</sub> nanocomposites obtained were deeply characterized by chemical analysis (ICP-AES), Powder X-ray diffraction (XRD), Fourier Transformed Infra-Red (FTIR), Thermogravimetric analysis (TGA), and High-Resolution Transmission Electron Microscopy (HRTEM). Clearly, the immobilization of TiO<sub>2</sub> by direct coprecipitation promoted a modification of the textural properties and a net increase in the surface area. The crystallized TiO<sub>2</sub> nanoparticles can be distinctly visualized by HRTEM at the surface of the layered material. Several parameters, such as the nature of the chemical composition of LDH (ZnAl and MgAl), the method of immobilization and the amount of TiO<sub>2</sub>, were shown to play a crucial role in the physicochemical and photocatalytic properties of the nanocomposites. The photocatalytic efficiency of the different LDH/TiO<sub>2</sub> nanocomposites was investigated using the photodegradation of a model pollutant, the Orange II (OII), and was compared to a pure TiO<sub>2</sub> colloidal solution. The degradation tests revealed that the nanocomposite obtained from MgAl LDH at a low MgAl LDH/TiO<sub>2</sub> ratio was the most efficient for the photodegradation of OII leading to complete mineralization in 48 h.https://www.mdpi.com/2305-7084/4/2/39photodegradationtitanium dioxideLDHOrange IInanocompositescoprecipitation |
| spellingShingle | Rodrigue Djeda Gilles Mailhot Vanessa Prevot Porous Layered Double Hydroxide/TiO<sub>2</sub> Photocatalysts for the Photocatalytic Degradation of Orange II ChemEngineering photodegradation titanium dioxide LDH Orange II nanocomposites coprecipitation |
| title | Porous Layered Double Hydroxide/TiO<sub>2</sub> Photocatalysts for the Photocatalytic Degradation of Orange II |
| title_full | Porous Layered Double Hydroxide/TiO<sub>2</sub> Photocatalysts for the Photocatalytic Degradation of Orange II |
| title_fullStr | Porous Layered Double Hydroxide/TiO<sub>2</sub> Photocatalysts for the Photocatalytic Degradation of Orange II |
| title_full_unstemmed | Porous Layered Double Hydroxide/TiO<sub>2</sub> Photocatalysts for the Photocatalytic Degradation of Orange II |
| title_short | Porous Layered Double Hydroxide/TiO<sub>2</sub> Photocatalysts for the Photocatalytic Degradation of Orange II |
| title_sort | porous layered double hydroxide tio sub 2 sub photocatalysts for the photocatalytic degradation of orange ii |
| topic | photodegradation titanium dioxide LDH Orange II nanocomposites coprecipitation |
| url | https://www.mdpi.com/2305-7084/4/2/39 |
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