scholarly journals Photoreduction route for Cu2O/TiO2 nanotubes junction for enhanced photocatalytic activity

RSC Advances ◽  
2018 ◽  
Vol 8 (22) ◽  
pp. 12420-12427 ◽  
Author(s):  
Van Viet Pham ◽  
Dai Phat Bui ◽  
Hong Huy Tran ◽  
Minh Thi Cao ◽  
Tri Khoa Nguyen ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Electric Field ◽  
Tio2 Nanotubes ◽  
Photocatalytic Performance ◽  
Internal Electric Field ◽  
Lower Power ◽  
Uv Lamp ◽  
Good Photocatalytic Performance

Good photocatalytic performance is demonstrated by Cu2O NPs directly loaded onto hydrothermally synthesized TiO2 NTs via photoreduction method conducted with a lower power UV lamp at room temp. This is due to narrowing bandgap and forming an internal electric field.

Enhanced Photocatalytic Activity by the Combined Influence of Ferroelectric Domain and Au Nanoparticles for BaTiO3 Fibers

NANO ◽  
2018 ◽  
Vol 13 (12) ◽  
pp. 1850149 ◽  
Author(s):  
Xiaoshan Zhang ◽  
Yu Huan ◽  
Yuanna Zhu ◽  
Hui Tian ◽  
Kai Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Surface Plasmon Resonance ◽  
Electric Field ◽  
Photocatalytic Performance ◽  
Au Nanoparticles ◽  
Ferroelectric Domain ◽  
Single Domain ◽  
Internal Electric Field ◽  
Domain Configuration ◽  
And Migration

Ferroelectric particles have been applied in the photocatalytic field because the spontaneous polarization results in the internal electric field, which can accelerate the separation and migration of photogenerated carriers. In this study, the BaTiO3 (BT) fibers are synthesized by electrospinning. The BT fibers calcined above 800[Formula: see text]C exhibit a strong ferroelectric property, which is verified by a typical butterfly-shaped displacement-voltage loop. It is found that the BT fibers with the single-domain structure exhibit better photocatalytic performance than that with the multi-domain configuration. When the single-domain transforms into multi-domain, the integrated internal electric field correspondingly breaks up, inducing that the internal electric field might cancel each other out and diminish the separation of photogenerated carriers. Also, the Au nanoparticles can improve the photocatalytic activity further on account of the surface plasmon resonance. Therefore, it is suggested that Au nanoparticles decorated on ferroelectric BT nanomaterials are promising photocatalysts.

Enhanced visible light and photocatalytic performance of TiO2 nanotubes by hydrogenation at lower temperature

RSC Advances ◽  
2016 ◽  
Vol 6 (8) ◽  
pp. 6643-6650 ◽  
Author(s):  
Lijuan Han ◽  
Zheng Ma ◽  
Zhihe Luo ◽  
Gang Liu ◽  
Jiantai Ma ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Tio2 Nanotubes ◽  
Photocatalytic Performance ◽  
Lower Temperature

The precursor with nanotubes structure can be hydrogenated easily in lower temperature comparing with nanobelts. The light absorption and photocatalytic activity of hydrogenated TiO2 nanotubes were enhanced drastically.

Controllable synthesis of uniform BiOF nanosheets and their improved photocatalytic activity by an exposed high-energy (002) facet and internal electric field

RSC Advances ◽  
2015 ◽  
Vol 5 (108) ◽  
pp. 88936-88942 ◽  
Author(s):  
Sijia Zou ◽  
Fei Teng ◽  
Chao Chang ◽  
Zailun Liu ◽  
Shurong Wang
Keyword(s):  
Photocatalytic Activity ◽  
Electric Field ◽  
High Energy ◽  
Internal Electric Field ◽  
Controllable Synthesis

Uniform BiOF nanosheets show an improved photocatalytic activity for the degradation of RhB dye.

Recent Progress in Anodic Oxidation of TiO2 Nanotubes and Enhanced Photocatalytic Performance: A Short Review

NANO ◽  
2021 ◽  
pp. 2130002
Author(s):  
Xiaojiang Nie ◽  
Siqi Yin ◽  
Wenchao Duan ◽  
Zilong Zhao ◽  
Liang Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Anodic Oxidation ◽  
Tio2 Nanotubes ◽  
Recent Progress ◽  
Photocatalytic Performance ◽  
Short Review ◽  
Nanotube Arrays ◽  
Organic System ◽  
Simple Preparation ◽  
Anodic Oxidation Method

By adjusting the oxidation voltage, electrolyte, anodizing time and other parameters, TiO2 nanotubes with high aspect ratio can be prepared by oxidation in organic system because anodic oxidation method has the advantage of simple preparation process, low material cost and controllable morphology. This review focusses on the influence of anodizing parameters on the morphology of TiO2 nanotube arrays prepared by anodizing. In order to improve the photocatalytic activity of TiO2 nanotubes under visible light and to prolong the life of photo-generated carriers, the research status of improving the photocatalytic activity of TiO2 nanotubes in recent years is reviewed. This review focusses on the preparation and modification of TiO2 nanotubes by anodic oxidation, which is helpful to understand the best structure of TiO2 nanotubes and the appropriate modification methods, thus guiding the application of TiO2 nanotubes in practical photocatalysis. Finally, the development of TiO2 nanotubes is prospected.

scholarly journals Bi2WO6–BiOCl heterostructure with enhanced photocatalytic activity for efficient degradation of oxytetracycline

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Mengfan Guo ◽  
Zhaobo Zhou ◽  
Shengnan Yan ◽  
Pengfei Zhou ◽  
Feng Miao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Density Functional ◽  
Photocatalytic Performance ◽  
Charge Carriers ◽  
Internal Electric Field ◽  
Functional Theory ◽  
Effective Electron ◽  
Solvothermal Methods ◽  
Emerging Organic Pollutants ◽  
Excellent Stability

Abstract The application of BiOCl in photocatalysis has been restricted by its low utilization of solar energy and fast recombination of charge carriers. In this study, zero-dimensional (0D) Bi2WO6 nanoparticles/two-dimensional (2D) layered BiOCl heterojunction composite was successfully constructed by facile hydrothermal and solvothermal methods. The most favorable sunlight photocatalytic activity was achieved for the as-prepared Bi2WO6–BiOCl composites with a ratio of 1%. The photocatalytic rate and mineralization efficiency of one typical antibiotic (i.e., oxytetracycline) over 1% Bi2WO6–BiOCl was about 2.7 and 5.3 times as high as that of BiOCl. Both experimental characterizations and density functional theory (DFT) calculations confirmed that the excellent photocatalytic performance mainly arised from the effective charge separation along the Bi2WO6 and BiOCl heterojunction interface. The effective electron transfer was driven by the internal electric field at the interfacial junction. In addition, 1% Bi2WO6–BiOCl exhibited excellent stability, and no apparent deactivation was observed after 4 test cycles. Therefore, the 0D/2D Bi2WO6–BiOCl heterojunction showed a great potential for the photocatalytic degradation of emerging organic pollutants.

scholarly journals Novel high-efficiency visible-light responsive Ag4(GeO4) photocatalyst

2017 ◽  
Vol 7 (11) ◽  
pp. 2318-2324 ◽  
Author(s):  
Xianglin Zhu ◽  
Peng Wang ◽  
Mengmeng Li ◽  
Qianqian Zhang ◽  
Elena A. Rozhkova ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Electric Field ◽  
Visible Light ◽  
High Efficiency ◽  
Internal Electric Field ◽  
Polar Materials

The existence of an internal electric field promotes the separation of generated carriers and enhances the photocatalytic activity of polar materials.

scholarly journals Ferroelectric Polarization-Enhanced Photocatalysis in BaTiO3-TiO2 Core-Shell Heterostructures

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1116 ◽  
Author(s):  
Xiaoyan Liu ◽  
Siyi Lv ◽  
Baoyan Fan ◽  
An Xing ◽  
Bi Jia
Keyword(s):  
Photocatalytic Activity ◽  
Carrier Transport ◽  
Photocatalytic Performance ◽  
Hydrothermal Process ◽  
Weight Ratio ◽  
Pure Tio2 ◽  
Ferroelectric Polarization ◽  
Great Promise ◽  
Core Shell ◽  
Internal Electric Field

Suppressing charge recombination and improving carrier transport are key challenges for the enhancement of photocatalytic activity of heterostructured photocatalysts. Here, we report a ferroelectric polarization-enhanced photocatalysis on the basis of BaTiO3-TiO2 core-shell heterostructures synthesized via a hydrothermal process. With an optimal weight ratio of BaTiO3 to TiO2, the heterostructures exhibited the maximum photocatalytic performance of 1.8 times higher than pure TiO2 nanoparticles. The enhanced photocatalytic activity is attributed to the promotion of charge separation and transport based on the internal electric field originating from the spontaneous polarization of ferroelectric BaTiO3. High stability of polarization-enhanced photocatalysis is also confirmed from the BaTiO3-TiO2 core-shell heterostructures. This study provides evidence that ferroelectric polarization holds great promise for improving the performance of heterostructured photocatalysts.

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