Facile room-temperature precipitation strategy for Ag2O/Bi2WO6 heterojunction with high simulated sunlight photocatalytic performance via bi-directed electron migration mechanism

RSC Advances ◽  
2015 ◽  
Vol 5 (41) ◽  
pp. 32333-32342 ◽  
Author(s):  
Chun-Mei Liu ◽  
Jing-Wang Liu ◽  
Guo-Ying Zhang ◽  
Jing-Bo Zhang ◽  
Qing-Song Wu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Room Temperature ◽  
Photocatalytic Performance ◽  
Simulated Sunlight ◽  
Charge Migration ◽  
Migration Mechanism ◽  
Electron Migration

A facilely solution precipitated Ag2O/Bi2WO6 composite exhibited greatly improved photocatalytic activity due to broadened photoresponse and multi-path charge migration at the interface.

In-situ construction of direct Z-scheme AgBr/α-Ag2WO4 heterojunction with promoted spatial charge migration and photocatalytic performance

2021 ◽  
Author(s):  
Xiao-Ya Zhai ◽  
Yifan Zhao ◽  
Guo-Ying Zhang ◽  
Bing-Yu Wang ◽  
Qi-Yun Mao
Keyword(s):  
Anion Exchange ◽  
Large Scale ◽  
Room Temperature ◽  
Photocatalytic Performance ◽  
Charge Migration ◽  
Time Saving ◽  
Spatial Charge ◽  
Construction Strategy ◽  
Large Scale Synthesis

In the work, a direct Z-scheme AgBr/α-Ag2WO4 heterojunction was prepared by in-situ anion exchange at room temperature. The construction strategy is energy- and time-saving for large scale synthesis. The α-Ag2WO4...

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.

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.

Hydroxyl-assisted iodine ions intercalating Bi2O2CO3 nanosheets to constructure the interlayered bridge for enhanced photocatalytic activity of phenol

CrystEngComm ◽  
2022 ◽  
Author(s):  
Jinbo Li ◽  
Zhaohui Wu ◽  
Shumin Zhang ◽  
Kai qiang Xu ◽  
Nan Ma ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Charge Migration

Promoting the charge migration and separation efficiency of Bi2O2CO3 is an appealing strategy to improve its photocatalytic performance. Herein, iodine-intercalated Bi2O2CO3 (I-Bi2O2CO3) nanosheets were prepared with the assistance of solvents...

Room temperature synthesis of Bi4O5I2 and Bi5O7I ultrathin nanosheets with a high visible light photocatalytic performance

2016 ◽  
Vol 45 (18) ◽  
pp. 7720-7727 ◽  
Author(s):  
Chao Liu ◽  
Xiao-jing Wang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Room Temperature ◽  
Photocatalytic Performance ◽  
Phenol Degradation ◽  
Temperature Synthesis ◽  
Room Temperature Synthesis ◽  
Ultrathin Nanosheets ◽  
Visible Light Photocatalytic ◽  
Facile Route

Bi4O5I2 and Bi5O7I ultrathin nanosheets with a high visible-light photocatalytic activity for phenol degradation are prepared via a facile route at room temperature.

scholarly journals Construction of Z-Scheme g-C3N4/CNT/Bi2Fe4O9 Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye Degradation

Micromachines ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 613 ◽  
Author(s):  
Lijing Di ◽  
Hua Yang ◽  
Tao Xian ◽  
Xiujuan Chen
Keyword(s):  
Photocatalytic Activity ◽  
Dye Degradation ◽  
Active Species ◽  
Simulated Sunlight ◽  
Acid Orange 7 ◽  
Electron Mediator ◽  
Sunlight Irradiation ◽  
Highly Efficient ◽  
Electron Migration ◽  
Photoelectrochemical Measurement

In this work, ternary all-solid-state Z-scheme g-C3N4/carbon nanotubes/Bi2Fe4O9 (g-C3N4/CNT/BFO) composites with enhanced photocatalytic activity were prepared by a hydrothermal method. The morphology observation shows that ternary heterojunctions are formed in the g-C3N4/CNT/BFO composites. The photocatalytic activity of the samples for the degradation of acid orange 7 was investigated under simulated sunlight irradiation. It was found that the ternary composites exhibit remarkable enhanced photocatalytic activity when compared with bare BFO and g-C3N4/BFO composites. The effect of the CNT content on the photocatalytic performance of the ternary composites was investigated. The photocatalytic mechanism of g-C3N4/CNT/BFO was proposed according to the photoelectrochemical measurement, photoluminescence, active species trapping experiment and energy-band potential analysis. The results reveal that the introduction of CNT as an excellent solid electron mediator into the ternary composites can effectively accelerate the electron migration between BFO and g-C3N4. This charge transfer process results in highly-efficient separation of photogenerated charges, thus leading to greatly enhanced photocatalytic activity of g-C3N4/CNT/BFO composites. Furthermore, the g-C3N4/CNT/BFO composites also exhibit highly-efficient photo-Fenton-like catalysis property.

Enhanced Photocatalytic Performance of Heterojunction BiOI/BiOIO3 Nanocomposites Under Simulated Solar Light

NANO ◽  
2017 ◽  
Vol 12 (03) ◽  
pp. 1750027 ◽  
Author(s):  
Yi Ling Qi ◽  
Xu Chun Song ◽  
Yi Fan Zheng
Keyword(s):  
Photocatalytic Activity ◽  
Electric Field ◽  
Visible Light ◽  
Rhodamine B ◽  
Room Temperature ◽  
Photocatalytic Performance ◽  
Deposition Method ◽  
Simulated Solar Light ◽  
Photogenerated Electrons ◽  
Light Absorber

Novel heterostructure BiOI/BiOIO3 nanocomposites were successfully prepared through a facile deposition method at room temperature. BiOIO3 is a noncentrosymmetric compound that has an internal self-built electric field. BiOI was applied as a visible light absorber to sensitize semiconductors owing to its smallest bandgap. The coupling between BiOIO3 and BiOI can combine their advantages and improve photocatalytic properties. Compared with the single BiOI and BiOIO3, the heterostructure BiOI/BiOIO3 nanocomposites displayed a significantly enhanced photocatalytic activity for the Rhodamine B (RhB) degradation. The enhanced photocatalytic performance is deduced closely related to the formation of BiOI/BiOIO3 heterojunction interface whose presence is regarded to be a favorable factor for the transfer and separation of the photogenerated electrons and holes.

scholarly journals Ag2CO3 Decorating BiOCOOH Microspheres with Enhanced Full-Spectrum Photocatalytic Activity for the Degradation of Toxic Pollutants

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 914 ◽  
Author(s):  
Shijie Li ◽  
Liuye Mo ◽  
Yanping Liu ◽  
Huiqiu Zhang ◽  
Yaming Ge ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Environmental Remediation ◽  
Photocatalytic Performance ◽  
Type I ◽  
Simulated Sunlight ◽  
Practical Application ◽  
Pollutant Degradation ◽  
Full Spectrum ◽  
Sunlight Irradiation ◽  
Toxic Pollutants

The development of excellent full-spectrum photocatalysts is of vital significance to its practical application in environmental remediation. Herein, flower-like Ag2CO3/BiOCOOH type I heterostructures were prepared via a facile method and exhibited powerful photocatalytic activity by removing various toxic pollutants (rhodamine B, methyl blue, and tetracycline hydrochloride) under simulated sunlight irradiation. The boosted photocatalytic performance is attributed to the expanded range of the absorption spectrum and alleviated separation rate of the photo-induced electrons and holes. The photoluminescence spectra and trapping experiment were applied to clarify the photocatalytic reaction mechanism of Ag2CO3/BiOCOOH. The holes and •O2− were detected as the dominant reactive species involved in pollutant degradation. This work provides a novel full-spectrum-driven photocatalyst of Ag2CO3/BiOCOOH, which could effectively degrade toxic pollutants under simulated sunlight.

Preparation of Z-scheme AgI/Bi5O7I plate with high visible light photocatalytic performance by phase transition and morphological transformation of BiOI microspheres at room temperature

2018 ◽  
Vol 47 (33) ◽  
pp. 11420-11428 ◽  
Author(s):  
Nan Yang ◽  
Xiang Lv ◽  
Suting Zhong ◽  
Danlin Qian ◽  
Sujuan Han ◽  
...  
Keyword(s):  
Phase Transition ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Room Temperature ◽  
Photocatalytic Performance ◽  
Transformation Process ◽  
High Photocatalytic Activity ◽  
Morphological Transformation ◽  
Visible Light Photocatalytic

Z-scheme AgI/Bi5O7I plate composite fabricated at room temperature through phase transition and morphological transformation process with high photocatalytic activity.

Preparation and Characterization of Fe3O4/TiO2 Composites by Heteroagglomeration

2012 ◽  
Vol 626 ◽  
pp. 131-137 ◽  
Author(s):  
Adel Fisli ◽  
Rahmi Saridewi ◽  
Sari Hasnah Dewi ◽  
Jarnuzi Gunlazuardi
Keyword(s):  
Photocatalytic Activity ◽  
Room Temperature ◽  
Photocatalytic Performance ◽  
Weight Ratio ◽  
Blue Dye ◽  
Sunlight Irradiation ◽  
Magnetization Hysteresis Loop ◽  
Crystal Phases ◽  
Aqueous Slurry

Fe3O4/TiO2composites were prepared by heteroagglomeration. The composites of different Fe3O4to TiO2weight ratio were prepared by mixing of prepared Fe3O4with TiO2in aqueous slurry, under ultrasonic treatment. All prepared samples were characterized by XRD, VSM, SEM/EDS, raman spectroscopy and BET. The prepared composites contained TiO2(anatase and rutile) and Fe3O4crystal phases. The magnetization hysteresis loop for Fe3O4/TiO2nanocomposites indicated that the hybrid catalyst showed superparamagnetic characteristics at room temperature. Photocatalytic performance of the prepared composites was examined by its ability to degrade methylene blue dye in aqueous solution. The photocatalytic activity of Fe3O4/TiO2composites was lower than that of pure TiO2sample because of the presence of non-active photocatalytic in composite (iron oxide). Under UV irradiation, the photocatalytic activity of Fe3O4/TiO2(1:1) composite was relatively similar to Fe3O4/TiO2(1:2), however, under sunlight irradiation, the photocatalytic activity of Fe3O4/TiO2(1:2) composite was relatively increase. The Fe3O4/TiO2composite can be easily recovered from treated water in slurry-type reactor by the application of an external magnetic field.

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