Highly Visible-Light-Photoactive Heterojunction Based on TiO2 Nanotubes Decorated by Pt Nanoparticles and Bi2S3 Quantum Dots

2017 ◽  
Vol 121 (32) ◽  
pp. 17215-17225 ◽  
Author(s):  
Paweł Mazierski ◽  
Joanna Nadolna ◽  
Grzegorz Nowaczyk ◽  
Wojciech Lisowski ◽  
Michał Jerzy Winiarski ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Tio2 Nanotubes ◽  
Pt Nanoparticles

Selectively depositing Bi2O3 quantum dots on TiO2 nanotubes for efficient visible-light-driven photocatalysis

2021 ◽  
Vol 288 ◽  
pp. 129413
Author(s):  
Baohui Lou ◽  
Changlei Chen ◽  
Juanjuan Liu ◽  
Shihui Zou ◽  
Liping Xiao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Tio2 Nanotubes ◽  
Visible Light Driven

scholarly journals Visible Light-Enhanced Antibacterial and Osteogenic Functionality of Au and Pt Nanoparticles Deposited on TiO2 Nanotubes

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3721 ◽  
Author(s):  
Kyoung-Suk Moon ◽  
Eun-Joo Choi ◽  
Ji-Myung Bae ◽  
Young-Bum Park ◽  
Seunghan Oh
Keyword(s):  
Antibacterial Activity ◽  
Visible Light ◽  
Noble Metal ◽  
Visible Light Irradiation ◽  
Tio2 Nanotubes ◽  
Pt Nanoparticles ◽  
Light Irradiation ◽  
Noble Metal Nanoparticles ◽  
Activity Test ◽  
Tio2 Nts

This study aimed at evaluating the visible light mediated antimicrobial and osteogenic applications of noble metal, such as gold (Au) and platinum (Pt) coated titania (TiO2) nanotubes (NTs). In this study, the Au and Pt nanoparticles (NPs) were deposited on anodized 100 nm TiO2 NTs by ion plasma sputtering. The Au and Pt NPs were mainly deposited on the top surface layer of TiO2 NTs and showed light absorbance peaks around the 470 and 600 nm visible light region used in this study, as seen from the surface characterization. From the results of antibacterial activity test, Au and Pt NPs that were deposited on TiO2 NTs showed excellent antibacterial activity under 470 nm visible light irradiation due to the plasmonic photocatalysis based on the localized surface plasmon resonance effect of the Au and Pt NPs. In addition, alkaline phosphate activity test and quantitative real-time PCR assay of osteogenic related genes resulted that these NPs promoted the osteogenic functionality of human mesenchymal stem cells (hMSCs) under 600 nm visible light irradiation, because of the synergic effect of the photothermal scattering of noble metal nanoparticles and visible light low-level laser therapy (LLLT). Therefore, the combination of noble metal coated TiO2 NTs and visible light irradiation would be expected to perform permanent antibacterial activity without the need of an antibacterial agent besides promoting osteogenic functionality.

Enhanced Visible-Light Photoelectrochemical Conversion on TiO2 Nanotubes with Bi2S3 Quantum Dots Obtained by in Situ Electrochemical Method

2018 ◽  
Vol 1 (8) ◽  
pp. 3636-3645 ◽  
Author(s):  
Denilson V. Freitas ◽  
Johan R. González-Moya ◽  
Thiago A. S. Soares ◽  
Richardson R. Silva ◽  
Dyego M. Oliveira ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Electrochemical Method ◽  
Tio2 Nanotubes

scholarly journals Preparation and Photocatalytic Performance for Degradation of Rhodamine B of AgPt/Bi4Ti3O12 Composites

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2206
Author(s):  
Gaoqian Yuan ◽  
Gen Zhang ◽  
Kezhuo Li ◽  
Faliang Li ◽  
Yunbo Cao ◽  
...  
Keyword(s):  
Visible Light ◽  
Noble Metal ◽  
Rhodamine B ◽  
Photocatalytic Performance ◽  
Bimetallic Nanoparticles ◽  
Resonance Effect ◽  
Visible Region ◽  
Photogenerated Electron ◽  
Pt Nanoparticles ◽  
Electron Hole

Loading a noble metal on Bi4Ti3O12 could enable the formation of the Schottky barrier at the interface between the former and the latter, which causes electrons to be trapped and inhibits the recombination of photoelectrons and photoholes. In this paper, AgPt/Bi4Ti3O12 composite photocatalysts were prepared using the photoreduction method, and the effects of the type and content of noble metal on the photocatalytic performance of the catalysts were investigated. The photocatalytic degradation of rhodamine B (RhB) showed that the loading of AgPt bimetallic nanoparticles significantly improved the catalytic performance of Bi4Ti3O12. When 0.10 wt% noble metal was loaded, the degradation rate for RhB of Ag0.7Pt0.3/Bi4Ti3O12 was 0.027 min−1, which was respectively about 2, 1.7 and 3.7 times as that of Ag/Bi4Ti3O12, Pt/Bi3Ti4O12 and Bi4Ti3O12. The reasons may be attributed as follows: (i) the utilization of visible light was enhanced due to the surface plasmon resonance effect of Ag and Pt in the visible region; (ii) Ag nanoparticles mainly acted as electron acceptors to restrain the recombination of photogenerated electron-hole pairs under visible light irradiation; and (iii) Pt nanoparticles acted as electron cocatalysts to further suppress the recombination of photogenerated electron-hole pairs. The photocatalytic performance of Ag0.7Pt0.3/Bi4Ti3O12 was superior to that of Ag/Bi4Ti3O12 and Pt/Bi3Ti4O12 owing to the synergistic effect between Ag and Pt nanoparticles.

Carbon quantum dot-sensitized hollow TiO2 spheres for high-performance visible light photocatalysis

2021 ◽  
Author(s):  
Xianfeng Zhang ◽  
Zongqun Li ◽  
Shaowen Xu ◽  
Yaowen Ruan
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
High Performance ◽  
Carbon Quantum Dots ◽  
Visible Light Photocatalysis ◽  
Carbon Quantum Dot ◽  
Visible Light Photocatalytic

TiO2/CQD composites were synthesized through carbon quantum dots covalently attached to the surface of hollow TiO2 spheres for visible light photocatalytic degradation of organics.

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