Carbon nanotubes as electronic mediators combined with Bi2MoO6 and g-C3N4 to form Z-scheme heterojunctions to enhance visible light photocatalysis

2021 ◽  
Author(s):  
Hao Wu ◽  
Fanming Meng ◽  
Xingbing Liu ◽  
Bo Yu
Keyword(s):  
Charge Transfer ◽  
Diffuse Reflectance ◽  
Photocatalytic Performance ◽  
Substantial Improvement ◽  
Simulated Sunlight ◽  
Electron Hole ◽  
Composite Photocatalyst ◽  
Composite Photocatalysts ◽  
Electron Hole Pair ◽  
Ft Ir

Abstract In this paper, Z-scheme Bi2MoO6/CNTs/g-C3N4 composite-photocatalysts were prepared through a simple hydrothermal method. The analysis was performed by XRD, FT-IR, SEM, EDS, TEM, HRTEM, XPS, BET, UV-Vis diffuse reflectance and PL spectrums. Various analyses show that CNTs not only act as excellent charge transfer bridges, but also enable the formation of a Z-scheme of charge transfer mechanism between Bi2MoO6 and g-C3N4. This process not only effectively isolates electrons and holes, but also prolongs electron-hole pair lifetimes, resulting in a substantial improvement in the photocatalytic performance of the composite photocatalyst. Best photocatalytic degradation performance was shown by Bi2MoO6/CNTs/g-C3N4 composite photocatalyst under simulated sunlight, while the composite photocatalyst still maintained extremely high degradation performance in cycling tests.

Synthesis and characterization of Z-scheme In2S3/Ag2CrO4 composites with an enhanced visible-light photocatalytic performance

2017 ◽  
Vol 41 (2) ◽  
pp. 845-856 ◽  
Author(s):  
Jin Luo ◽  
Xiaosong Zhou ◽  
Xiaomei Ning ◽  
Liang Zhan ◽  
Lin Ma ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Photocatalytic Performance ◽  
Photogenerated Electron ◽  
Synthesis And Characterization ◽  
Electron Hole ◽  
Pair Separation ◽  
Efficient Charge ◽  
Electron Hole Pair ◽  
Visible Light Photocatalytic

Efficient charge transfer at the interfaces of an In2S3/Ag2CrO4 composite, due to the formation of a Z-scheme system between In2S3 and Ag2CrO4, effectively facilitates photogenerated electron–hole pair separation.

scholarly journals Facile Fabrication of g-C3N4/Fe3O4 Photocatalyst with Enhanced Visible-Light Photocatalytic Activity towards the Degradation of Tartrazine Dye

2021 ◽  
Vol 33 (10) ◽  
pp. 2293-2300
Author(s):  
S. Nikhil ◽  
R. Arunadevi ◽  
Krishna Veni ◽  
C. Sudhakar ◽  
A. Karthika ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
Precipitation Method ◽  
Electron Hole ◽  
First Order ◽  
First Order Kinetics ◽  
Electron Hole Pair ◽  
Facile Fabrication ◽  
Pair Generation ◽  
Ft Ir ◽  
Co Precipitation

The removal of tartrazine dye from aqueous solution using g-C3N4/Fe3O4 nanocomposites was studied. The g-C3N4/Fe3O4 nanocomposites were synthesized using simple co-precipitation method. The synthesized nanocomposites were characterized by spectral (UV-Vis DRS, FT-IR) and analytical (PXRD, SEM, EDAX, HRTEM) techniques. Photodegradation of tartrazine dye using the synthesized catalyst was studied. The g-C3N4/Fe3O4 nanocomposites exhibited excellent photocatalytic performance by degrading tartrazine (90%) at 0.1 g/L of catalyst and 20 μM initial dye concentration at pH 3. The excellent performance by the catalyst was attributed to the highest electron hole pair generation. The kinetic study revealed that the photodegradation of tartrazine obeyed pseudo first-order kinetics.

Construction of LZU1@WO3 heterojunction photocatalysts: enhanced photocatalytic performance and mechanism insight

2021 ◽  
Vol 45 (36) ◽  
pp. 17025-17036
Author(s):  
Simin Shang ◽  
Huaizhi Yang ◽  
Dajun Shi ◽  
Bowen Dong ◽  
Heling Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Hybrid Materials ◽  
Photocatalytic Performance ◽  
Production Capacity ◽  
Simulated Sunlight ◽  
Composite Photocatalysts ◽  
Performance And Mechanism

Our well-designed nano-WO3@LZU1 composite photocatalysts were fully characterized. Under simulated sunlight, the hybrid materials showed much higher photocatalytic activity for BBR degradation and MB degradation than WO3 or LZU1, and improved hydrogen production capacity.

ATOMISTIC SIMULATION OF DISSIPATIVE CHARGE CARRIER DYNAMICS FOR PHOTOCATALYSIS

2012 ◽  
Vol 1390 ◽  
Author(s):  
Talgat M. Inerbaev ◽  
Dmitri S. Kilin ◽  
James Hoefelmeyer
Keyword(s):  
Charge Transfer ◽  
High Surface ◽  
High Surface Area ◽  
Oxidation Catalysis ◽  
Electron Hole ◽  
Charge Carrier Dynamics ◽  
Electron Hole Pair ◽  
Charge Transfer Dynamics ◽  
Reduced Density ◽  
Positively Charged

ABSTRACTPhoto-excitation of high surface area semiconductor nanorods decorated with surface catalyst particles are investigated. DFT-based simulation is applied to the charge transfer dynamics at the interface of the supported nanocatalyst by modeling dynamics of photo-excitations. The modeling is performed by reduced density matrix method in the basis of Kohn-Sham orbitals. The energy of photo-excitation is dissipating due to interaction with lattice vibrations, treated through non-adiabatic coupling as the electron/hole pair relaxes to the conduction / valence band edges. The methodology is applied to TiO2 nanorod modeled as a periodic anatase (100) slab functionalized by minimalistic nano-clusters or doping. Simulations of these models demonstrate the formation of charge transfer state in both time and frequency domain. Computed charge dynamics leads to creation of positively charged areas on the nanorod surface that is an important prerequisite for oxidation catalysis. Our computation identifies optimal composition and morphology of nanocatalyst for such applications as water splitting for hydrogen production or solar cells.

Study on Photocatalytic Performance of F-Doped Nanometer TiO2

2011 ◽  
Vol 299-300 ◽  
pp. 171-174 ◽  
Author(s):  
Shao Feng Yan ◽  
Tong Sun
Keyword(s):  
Electron Microscopy ◽  
Rhodamine B ◽  
Diffuse Reflectance ◽  
Photocatalytic Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
Synthesis Method ◽  
Order Kinetic ◽  
Transmission Electron ◽  
Ft Ir ◽  
Photocatalytic Performances

F-doped TiO2 by hydrothermal synthesis method is prepared in this paper. By basis of sunlight and porous nickels as the carriers, the samples were characterized by Transmission electron microscopy (TEM), scanning electron microscopy (SEM), infra-red (FT-IR) and diffuse reflectance spectroscopy (UV-vis). The photocatalytic performances of the samples were estimated by degrading Rhodamine B. which indicates that the reaction of photocatalytic degradation of Rhodamine B follows the zero order kinetic law. The photocatalytic performances are increased by F-doped. And F optimum doping dosage is 2.0%. After calcination at 500°C, the photocatalytic performance of the sample has not been obvious improved.

scholarly journals Growth Process and CQDs-modified Bi4Ti3O12 Square Plates with Enhanced Photocatalytic Performance

Micromachines ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 66 ◽  
Author(s):  
Xinxin Zhao ◽  
Hua Yang ◽  
Ziming Cui ◽  
Xiangxian Wang ◽  
Zao Yi
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Growth Process ◽  
Photocatalytic Performance ◽  
Simulated Sunlight ◽  
Hydrothermal Route ◽  
Electron Hole ◽  
X Ray ◽  
Photocurrent Spectroscopy

Bi4Ti3O12 square plates were synthesized via a hydrothermal route, and their growth process was systematically investigated. Carbon quantum dots (CQDs) were prepared using glucose as the carbon source, which were then assembled on the surface of Bi4Ti3O12 square plates via a hydrothermal route with the aim of enhancing the photocatalytic performance. XRD (X-ray powder diffraction), SEM (scanning electron microscopy), TEM (transmission electron microscopy), UV-vis DRS (diffuse reflectance spectroscopy), XPS (X-ray photoelectron spectroscopy), FTIR (Fourier transform infrared spectroscopy), PL (photoluminescence) spectroscopy, EIS (electrochemical impedance spectroscopy) and photocurrent spectroscopy were used to systematically characterize the as-prepared samples. It is demonstrated that the decoration of CQDs on Bi4Ti3O12 plates leads to an increased visible light absorption, slightly increased bandgap, increased photocurrent density, decreased charge-transfer resistance, and decreased PL intensity. Simulated sunlight and visible light were separately used as a light source to evaluate the photocatalytic activity of the samples toward the degradation of RhB in aqueous solution. Under both simulated sunlight and visible light irradiation, CQDs@Bi4Ti3O12 composites with an appropriate amount of CQDs exhibit obviously enhanced photocatalytic performance. However, the decoration of excessive CQDs gives rise to a decrease in the photocatalytic activity. The enhanced photocatalytic activity of CQDs-modified Bi4Ti3O12 can be attributed to the following reasons: (1) The electron transfer between Bi4Ti3O12 and CQDs promotes an efficient separation of photogenerated electron/hole pairs in Bi4Ti3O12; (2) the up-conversion photoluminescence emitted from CQDs could induce the generation of additional electron/hole pairs in Bi4Ti3O12; and (3) the photoexcited electrons in CQDs could participate in the photocatalytic reactions.

scholarly journals Synthesis and Characterization of Amorphous Molybdenum Sulfide (MoSx)/CdIn2S4 Composite Photocatalyst: Co-Catalyst Using in the Hydrogen Evolution Reaction

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1455
Author(s):  
Qi Li ◽  
Wanli Liu ◽  
Xuejian Xie ◽  
Xianglong Yang ◽  
Xiufang Chen ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Separation Efficiency ◽  
Photogenerated Electron ◽  
Molybdenum Sulfide ◽  
Electron Hole ◽  
Composite Photocatalyst ◽  
Co Catalyst ◽  
Pair Separation ◽  
Electron Hole Pair

Co-catalyst deposition is used to improve the surface and electrical properties of photocatalysts. In this work, MoSx/CdIn2S4 nanocomposites were prepared by a facile hydrothermal and photodeposition route. The basic crystalline phases and morphology of the as-prepared samples were determined, and these results showed that MoSx was tightly anchored onto CdIn2S4 by sharing the same S atom. In the hydrogen production experiments, MoSx/CdIn2S4-40 displayed the optimal photocatalytic hydrogen production yield in 4 h. The H2 evolution rate reached 2846.73 μmol/g/h, which was 13.6-times higher than that of pure CdIn2S4. Analyzing the photocatalytic enhancement mechanisms revealed that this unique structure had a remarkable photogenerated electron-hole pair separation efficiency, rapid charge carrier transfer channels, and more abundant surface reaction sites. The use of co-catalyst (MoSx) greatly improved the photocatalytic activity of CdIn2S4.

Microwave-Assisted Fabrication of Recyclable CdS/Fe3O4/rGO Photocatalysts to Improve the Photocatalytic Performance Under Visible Light

NANO ◽  
2016 ◽  
Vol 11 (11) ◽  
pp. 1650129 ◽  
Author(s):  
Xinlin Liu ◽  
Yingying Qin ◽  
Mingjun Zhou ◽  
Yongsheng Yan
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Visible Light ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Active Species ◽  
Microwave Method ◽  
Composite Photocatalyst ◽  
Microwave Assisted

A unique CdS/Fe3O4/rGO composite photocatalyst is successfully synthesized by the microwave method. It displays promising photocatalytic activity towards the photo-degrading of tetracycline (TC) in aqueous solution, the degradation rate of TC is 69% with adding 0.1[Formula: see text]g CdS/Fe3O4/rGO photocatalyst into 20[Formula: see text]mg/L tetracycline for 2[Formula: see text]h under visible light irradiation. Furthermore, the mechanism was systematically investigated by active species trapping experiment. It can be known that [Formula: see text] the major active species in the photodegradation process and the possible process of charge transfer for CdS/Fe3O4/rGO was proposed based on the experimental results. The as-prepared samples were carefully evaluated by XRD, TEM, XPS, VSM, PL spectra, Raman spectrometer.

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