Fabrication of a heterostructured Ag/AgCl/Bi2MoO6 plasmonic photocatalyst with efficient visible light activity towards dyes

RSC Advances ◽  
2015 ◽  
Vol 5 (22) ◽  
pp. 17245-17252 ◽  
Author(s):  
Qing Yan ◽  
Meng Sun ◽  
Tao Yan ◽  
Mengmeng Li ◽  
Liangguo Yan ◽  
...  
Keyword(s):  
Visible Light ◽  
Synthesis Method ◽  
Plasmonic Photocatalyst ◽  
Light Activity

A ternary Ag/AgCl/Bi2MoO6 plasmonic photocatalyst was successfully fabricated through a two-step synthesis method.

A bi-overlayer type plasmonic photocatalyst consisting of mesoporous Au/TiO2 and CuO/SnO2 films separately coated on FTO

2015 ◽  
Vol 17 (27) ◽  
pp. 18004-18010 ◽  
Author(s):  
Shin-ichi Naya ◽  
Takahiro Kume ◽  
Nozomi Okumura ◽  
Hiroaki Tada
Keyword(s):  
Liquid Phase ◽  
Visible Light ◽  
Gas Phase ◽  
Plasmonic Photocatalyst ◽  
Light Activity ◽  
High Level

A bi-overlayer type “plasmonic photocatalyst” consisting of Au/mp-TiO2 and CuO/mp-SnO2 separately formed on the FTO substrate exhibits a high level of visible-light activity for the gas-phase and liquid-phase reactions.

scholarly journals Defective Dopant-Free TiO2 as an Efficient Visible Light-Active Photocatalyst

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 978
Author(s):  
Marcin Janczarek ◽  
Ewa Kowalska
Keyword(s):  
Visible Light ◽  
Surface Defects ◽  
Synthesis Method ◽  
Preparation Conditions ◽  
Light Activity ◽  
Beneficial Impact ◽  
Visible Light Active ◽  
Recombination Centers ◽  
Photocatalytic Reactions ◽  
Doped Titania

Pristine and modified/doped titania are still some of the most widely investigated photocatalysts due to its high activity, stability, abundance and proper redox properties to carry out various reactions. However, modifiers and/or dopants resulting in visible-light activity might be expensive or work as recombination centers under UV irradiation. It seems that defective titania, known as “self-doped” TiO2, might be the best solution since it can be obtained under mild conditions without the addition of expensive materials and methods. This review discusses various methods of defective titania preparation, characterization of defect types, their localization (surface vs. bulk) and their function, as well as proposed mechanisms of photocatalytic reactions in the presence of self-doped titania. Although many kinds of defective titania samples have already been prepared with different colors, color intensities and defect kinds (mainly Ti3+ and oxygen vacancies), it is difficult to conclude which of them are the most recommended as the preparation conditions and activity testing used by authors differ. Furthermore, activity testing under solar radiation and for dyes does not clarify the mechanism since bare titania can also be excited and sensitized, respectively, in these conditions. In many reports, authors have not considered the possible influence of some impurities originated from the synthesis method (e.g., H, Al, Zn, Cl, F) that could co-participate in the overall mechanism of photocatalytic reactions. Moreover, some reports indicate that defective titania, especially black ones, might decrease activity since the defects might work as recombination centers. Despite some unproven/unclear findings and unanswered questions, there are many well-conducted studies confirmed by both experimental and theoretical studies that defective titania might be a promising material for various photocatalytic reactions under both UV and visible-light irradiation. Based on available literature, it could be proposed that optimal defects’ concentration, the preferential role of surface defects, a higher surface-to-bulk ratio of defects in rutile than in anatase, and the beneficial impact of disordered surface are the most important aspects to be considered during the preparation of defective titania.

scholarly journals A visible light-driven plasmonic photocatalyst

2014 ◽  
Vol 3 (1) ◽  
pp. e133-e133 ◽  
Author(s):  
Francesca Pincella ◽  
Katsuhiro Isozaki ◽  
Kazushi Miki
Keyword(s):  
Visible Light ◽  
Plasmonic Photocatalyst ◽  
Visible Light Driven

SiO2@Ag/AgCl: a low-cost and highly efficient plasmonic photocatalyst for degrading rhodamine B under visible light irradiation

RSC Advances ◽  
2014 ◽  
Vol 4 (110) ◽  
pp. 64747-64755 ◽  
Author(s):  
Xuefeng Xu ◽  
Man Wang ◽  
Yanyan Pei ◽  
Changchun Ai ◽  
Liangjie Yuan
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Photocatalytic Performance ◽  
Low Cost ◽  
Light Irradiation ◽  
Nano Structure ◽  
Plasmonic Photocatalyst ◽  
Highly Efficient

The micro/nano-structure composite SiO2@Ag/AgCl was employed as a low cost photocatalyst for the degradation of RhB in aqueous solution under visible light irradiation, which exhibited excellent photocatalytic performance and stability.

scholarly journals Preparation of N-TiO2/SiO2 composites by solvothermal method and their photocatalytic properties

2022 ◽  
Author(s):  
Chunli Wu ◽  
Xiaohao Dong ◽  
Lan Wang ◽  
Lei Zhang ◽  
Xiaotong Liu
Keyword(s):  
Nitric Acid ◽  
Energy Level ◽  
Visible Light ◽  
Solvothermal Method ◽  
Synthesis Method ◽  
Volume Ratio ◽  
Tetrabutyl Titanate ◽  
Characterization Methods ◽  
Long Term Stability ◽  
Photoelectric Properties

Abstract In order to improve the visible light catalytic activity of titanium dioxide (TiO2) and ensure its long-term stability on the surface of concrete, an N-TiO2/SiO2 composite was prepared using tetrabutyl titanate, nitric acid, and modified SiO2 nanospheres as the precursors by a solvothermal method. The effect of nitric acid on the phase composition, morphology and photoelectric properties of the synthesized photocatalytic composites was systematically studied by various characterization methods. The results show that the optimum nitric acid/butyl titanate volume ratio is 1/6. The nitrogen-doped TiO2 nanoparticles were uniformly dispersed on the surface of spherical SiO2 with a diameter of 200 nm. The degradation rate of simulated pollutants (RhB) with pH 5 and 7 exceeded 95% within 30 minutes and the catalytic effect remained excellent after five repetitions without much weakening. The excellent visible photocatalytic performance can be attributed to the doping of N replacing part of the oxygen atoms in TiO2, forming the energy level of N 2p at the O 2p energy level and reducing the TiO2 energy band gap to 2.99 eV. At the same time, the better dispersion of N-TiO2/SiO2 prepared by this new synthesis method also plays an important role in the improvement of visible light photocatalytic activity.

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