Pt-Modified Interfacial Engineering for Enhanced Photocatalytic Performance of 3D Ordered Macroporous TiO<sub>2</sub>
Narrowing the band gap and increasing the photodegradation efficiency of TiO<sub>2</sub>-based photocatalysts are very important for their wide application in environment-related fields such as photocatalytic degradation of toxic pollutants in wastewater. Herein, a three-dimensionally or...
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MDPI AG
2022-05-01
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| Online Access: | https://www.mdpi.com/2073-4352/12/6/778 |
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| author | Shunhong Dong Juan Wu Lanlan Huang Hong-En Wang |
| author_facet | Shunhong Dong Juan Wu Lanlan Huang Hong-En Wang |
| author_sort | Shunhong Dong |
| collection | DOAJ |
| description | Narrowing the band gap and increasing the photodegradation efficiency of TiO<sub>2</sub>-based photocatalysts are very important for their wide application in environment-related fields such as photocatalytic degradation of toxic pollutants in wastewater. Herein, a three-dimensionally ordered macroporous Pt-loaded TiO<sub>2</sub> photocatalyst (3DOM Pt/TiO<sub>2</sub>) has been successfully synthesized using a facile colloidal crystal-template method. The resultant composite combines several morphological/structural advantages, including uniform 3D ordered macroporous skeletons, high crystallinity, large porosity and an internal electric field formed at Pt/TiO<sub>2</sub> interfaces. These unique features enable the 3DOM Pt/TiO<sub>2</sub> to possess a large surface for photocatalytic reactions and fast diffusion for mass transfer of reactants as well as efficient suppression of recombination for photogenerated electron-hole pairs in TiO<sub>2</sub>. Thus, the 3DOM Pt/TiO<sub>2</sub> exhibits significantly enhanced photocatalytic activity. Typically, 88% of RhB can be degraded over the 3DOM Pt/TiO<sub>2</sub> photocatalyst under visible light irradiation (λ ≥ 420 nm) within 100 min, much higher than that of the commercial TiO<sub>2</sub> nanoparticles (only 37%). The underlying mechanism for the enhanced photocatalytic activity of 3DOM Pt/TiO<sub>2</sub> has been further analyzed based on energy band theory and ascribed to the formation of Schottky-type Pt/TiO<sub>2</sub> junctions. The proposed method herein can provide new references for further improving the photocatalytic efficiency of other photocatalysts via rational structural/morphological engineering. |
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| last_indexed | 2024-03-10T00:04:32Z |
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| spelling | doaj.art-a3df459e3ede488e840c78d7cd40f7752023-11-23T16:11:41ZengMDPI AGCrystals2073-43522022-05-0112677810.3390/cryst12060778Pt-Modified Interfacial Engineering for Enhanced Photocatalytic Performance of 3D Ordered Macroporous TiO<sub>2</sub>Shunhong Dong0Juan Wu1Lanlan Huang2Hong-En Wang3State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Materials Science and Engineering, Hubei University, Wuhan 430062, ChinaSchool of Materials Science and Engineering, Hubei University, Wuhan 430062, ChinaYunnan Key Laboratory of Optoelectronic Information Technology, College of Physics and Electronics Information, Yunnan Normal University, Kunming 650500, ChinaNarrowing the band gap and increasing the photodegradation efficiency of TiO<sub>2</sub>-based photocatalysts are very important for their wide application in environment-related fields such as photocatalytic degradation of toxic pollutants in wastewater. Herein, a three-dimensionally ordered macroporous Pt-loaded TiO<sub>2</sub> photocatalyst (3DOM Pt/TiO<sub>2</sub>) has been successfully synthesized using a facile colloidal crystal-template method. The resultant composite combines several morphological/structural advantages, including uniform 3D ordered macroporous skeletons, high crystallinity, large porosity and an internal electric field formed at Pt/TiO<sub>2</sub> interfaces. These unique features enable the 3DOM Pt/TiO<sub>2</sub> to possess a large surface for photocatalytic reactions and fast diffusion for mass transfer of reactants as well as efficient suppression of recombination for photogenerated electron-hole pairs in TiO<sub>2</sub>. Thus, the 3DOM Pt/TiO<sub>2</sub> exhibits significantly enhanced photocatalytic activity. Typically, 88% of RhB can be degraded over the 3DOM Pt/TiO<sub>2</sub> photocatalyst under visible light irradiation (λ ≥ 420 nm) within 100 min, much higher than that of the commercial TiO<sub>2</sub> nanoparticles (only 37%). The underlying mechanism for the enhanced photocatalytic activity of 3DOM Pt/TiO<sub>2</sub> has been further analyzed based on energy band theory and ascribed to the formation of Schottky-type Pt/TiO<sub>2</sub> junctions. The proposed method herein can provide new references for further improving the photocatalytic efficiency of other photocatalysts via rational structural/morphological engineering.https://www.mdpi.com/2073-4352/12/6/7783D ordered macroporesTiO<sub>2</sub>Pt loadingphotocatalysisSchottky junction |
| spellingShingle | Shunhong Dong Juan Wu Lanlan Huang Hong-En Wang Pt-Modified Interfacial Engineering for Enhanced Photocatalytic Performance of 3D Ordered Macroporous TiO<sub>2</sub> Crystals 3D ordered macropores TiO<sub>2</sub> Pt loading photocatalysis Schottky junction |
| title | Pt-Modified Interfacial Engineering for Enhanced Photocatalytic Performance of 3D Ordered Macroporous TiO<sub>2</sub> |
| title_full | Pt-Modified Interfacial Engineering for Enhanced Photocatalytic Performance of 3D Ordered Macroporous TiO<sub>2</sub> |
| title_fullStr | Pt-Modified Interfacial Engineering for Enhanced Photocatalytic Performance of 3D Ordered Macroporous TiO<sub>2</sub> |
| title_full_unstemmed | Pt-Modified Interfacial Engineering for Enhanced Photocatalytic Performance of 3D Ordered Macroporous TiO<sub>2</sub> |
| title_short | Pt-Modified Interfacial Engineering for Enhanced Photocatalytic Performance of 3D Ordered Macroporous TiO<sub>2</sub> |
| title_sort | pt modified interfacial engineering for enhanced photocatalytic performance of 3d ordered macroporous tio sub 2 sub |
| topic | 3D ordered macropores TiO<sub>2</sub> Pt loading photocatalysis Schottky junction |
| url | https://www.mdpi.com/2073-4352/12/6/778 |
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