scholarly journals TiO2 Inverse Opals Modified by Ag Nanoparticles: A Synergic Effect of Enhanced Visible-Light Absorption and Efficient Charge Separation for Visible-Light Photocatalysis

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 761
Author(s):  
Thanh-Hiep Thi Le ◽  
Thanh-Trang Bui ◽  
Hao Van Bui ◽  
Van-Duong Dao ◽  
Loan Le Thi Ngoc
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Ag Nanoparticles ◽  
Photocatalytic Performance ◽  
Honeycomb Structure ◽  
Synergic Effect ◽  
Polystyrene Spheres ◽  
Visible Light Absorption ◽  
Photogenerated Electrons ◽  
Efficient Charge

This work reports on the synthesis, characterization, and photocatalytic performance of the TiO2 inverse opal nanostructure (IP-TiO2) and the IP-TiO2 modified by Ag nanoparticles (Ag@IP-TiO2). The IP-TiO2 is fabricated using polystyrene spheres as the template and TiCl4 as the precursor, and the Ag@IP-TiO2 is realized by photoreduction method. The morphological, structural, and optical properties of the materials are investigated by scanning electron microscopy, X-ray diffraction, ultraviolet–visible (UV-VIS) absorption spectroscopy, and photoluminescence spectroscopy. Their photocatalytic performances are studied by the degradation of rifampicin antibiotic under the visible-light irradiation generated by an LED lamp. The results demonstrate that the IP-TiO2 is composed of mesopores arranged in the honeycomb structure and strongly absorbs visible light in the wavelength range of 400–500 nm. This facilitates the visible-light catalytic activity of IP-TiO2, which is further enhanced by the surface modification by Ag nanoparticles. Our studies on the UV-VIS absorption and photoluminescent properties of the materials reveal that the presence of Ag nanoparticles not only enhances the visible-light absorption of IP-TiO2, but also reduces the recombination of photogenerated electrons and holes. These two factors create a synergic effect that causes the enhanced photocatalytic performance of Ag@IP-TiO2.

Effect of Rh valence state and doping concentration on the structure and photocatalytic H2 evolution in (Nb,Rh) codoped TiO2 nanorods

Nanoscale ◽  
2020 ◽  
Vol 12 (43) ◽  
pp. 22082-22090
Author(s):  
Jiquan Huang ◽  
Ting Lv ◽  
Qiufeng Huang ◽  
Zhonghua Deng ◽  
Jian Chen ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Light Absorption ◽  
Valence State ◽  
Doping Concentration ◽  
Photocatalytic Performance ◽  
Tio2 Nanorods ◽  
H2 Evolution ◽  
Visible Light Absorption ◽  
Photocatalytic H2 Evolution

(Nb,Rh) codoped TiO2 nanorods exhibit strong visible light absorption and efficient photocatalytic performance for hydrogen production.

scholarly journals Visible-Light Driven TiO2 Photocatalyst Coated with Graphene Quantum Dots of Tunable Nitrogen Doping

Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 344 ◽  
Author(s):  
Xiong Sun ◽  
Hui-Jun Li ◽  
Nanquan Ou ◽  
Bowen Lyu ◽  
Bojie Gui ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Photocatalytic Performance ◽  
Light Emission ◽  
Graphene Quantum Dots ◽  
Visible Light Absorption ◽  
Visible Light Driven ◽  
Nitrogen Doped Graphene

Nitrogen doped graphene quantum dots (NGQDs) were successfully prepared via a hydrothermal method using citric acid and urea as the carbon and nitrogen precursors, respectively. Due to different post-treatment processes, the obtained NGQDs with different surface modifications exhibited blue light emission, while their visible-light absorption was obviously different. To further understand the roles of nitrogen dopants and N-containing surface groups of NGQDs in the photocatalytic performance, their corresponding composites with TiO2 were utilized to degrade RhB solutions under visible-light irradiation. A series of characterization and photocatalytic performance tests were carried out, which demonstrated that NGQDs play a significant role in enhancing visible-light driven photocatalytic activity and the carrier separation process. The enhanced photocatalytic activity of the NGQDs/TiO2 composites can possibly be attributed to an enhanced visible light absorption ability, and an improved separation and transfer rate of photogenerated carriers.

Enhanced visible light absorption and photocatalytic activity of [KNbO3]1−x[BaNi0.5Nb0.5O3−δ]x synthesized by sol–gel based Pechini method

RSC Advances ◽  
2016 ◽  
Vol 6 (85) ◽  
pp. 82409-82416 ◽  
Author(s):  
Ping Wu ◽  
Guoming Wang ◽  
Ruizhi Chen ◽  
Yixin Guo ◽  
Xueming Ma ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Low Temperature ◽  
Visible Light ◽  
Light Absorption ◽  
Photocatalytic Performance ◽  
Pechini Method ◽  
Sol Gel ◽  
Visible Light Absorption ◽  
Gel Method ◽  
Visible Light Photocatalytic

[KNbO3]1−x[BaNi0.5Nb0.5O3−δ]x were synthesized by Pechini sol–gel method at low temperature. Visible light photocatalytic performance of this material was evaluated.

Enhanced visible light absorption by TiO2 film patterned with Ag nanoparticles arrays

2013 ◽  
Vol 54 ◽  
pp. 326-330 ◽  
Author(s):  
Aparna Ganguly ◽  
Aniruddha Mondal ◽  
Jay Chandra Dhar ◽  
Naorem Khelchand Singh ◽  
Sushabhan Choudhury
Keyword(s):  
Visible Light ◽  
Tio2 Film ◽  
Light Absorption ◽  
Ag Nanoparticles ◽  
Visible Light Absorption

scholarly journals A metal-free 3C-SiC/g-C3N4 composite with enhanced visible light photocatalytic activity

RSC Advances ◽  
2017 ◽  
Vol 7 (63) ◽  
pp. 40028-40033 ◽  
Author(s):  
Hao Xu ◽  
Zhixing Gan ◽  
Weiping Zhou ◽  
Zuoming Ding ◽  
Xiaowei Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
Photogenerated Electron ◽  
Electron Hole ◽  
Visible Light Absorption ◽  
Metal Free ◽  
Visible Light Photocatalytic

Insufficient visible light absorption and fast recombination of the photogenerated electron–hole pairs have seriously hampered the photocatalytic performance of graphitic carbon nitride (g-C3N4) up to now.

scholarly journals A facile synthesis of Zn-doped TiO2 nanoparticles with highly exposed (001) facets for enhanced photocatalytic performance

RSC Advances ◽  
2021 ◽  
Vol 11 (13) ◽  
pp. 7627-7632
Author(s):  
Kun Jiang ◽  
Jin Zhang ◽  
Rui Luo ◽  
Yingfei Wan ◽  
Zengjian Liu ◽  
...  
Keyword(s):  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Light Absorption ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Absorption Capacity ◽  
Facile Synthesis ◽  
Visible Light Absorption ◽  
Doped Tio2 ◽  
Carrier Separation

It is a great challenge to simultaneously improve the visible light absorption capacity and enhance photon-generated carrier separation efficiency of photocatalysts.

A simple, scalable approach for combining carbon dots with hexagonal nanoplates of nickel-based compounds for efficient photocatalytic reduction

2018 ◽  
Vol 47 (36) ◽  
pp. 12694-12701 ◽  
Author(s):  
Zhenchao Song ◽  
Qing Chang ◽  
Adrian Trinchi ◽  
Ning Li ◽  
Huiqi Wang ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Carbon Dots ◽  
Photocatalytic Performance ◽  
Photocatalytic Reduction ◽  
Visible Light Absorption ◽  
Hexagonal Nanoplates

The combination of carbon dots and hexagonal nanoplates of nickel-based compounds exhibits enhanced visible light absorption and excellent photocatalytic performance for the reduction of 4-nitrophenol to 4-aminophenol.

Oxygen Vacancy Induced Bismuth Oxyiodide with Remarkably Increased Visible-Light Absorption and Superior Photocatalytic Performance

2014 ◽  
Vol 6 (24) ◽  
pp. 22920-22927 ◽  
Author(s):  
Yongchao Huang ◽  
Haibo Li ◽  
Muhammad-Sadeeq Balogun ◽  
Wenyue Liu ◽  
Yexiang Tong ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Visible Light ◽  
Light Absorption ◽  
Photocatalytic Performance ◽  
Visible Light Absorption

Nitrogen deficient carbon nitride for efficient visible light driven tetracycline degradation: a combination of experimental and DFT studies

2020 ◽  
Vol 10 (20) ◽  
pp. 6800-6808
Author(s):  
Mier Wang ◽  
Changzheng Fan ◽  
Shuaijun Yang ◽  
Milan Liu ◽  
Jun Luo ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Recombination Rate ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
Graphitic Carbon Nitride ◽  
Dft Studies ◽  
Visible Light Absorption ◽  
Tetracycline Degradation ◽  
Visible Light Driven

The narrow visible-light absorption range and a high recombination rate of photo-excited electrons and holes are the main reasons for the confined photocatalytic performance of graphitic carbon nitride (g-C3N4).

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