In situ coupling of TiO2(B) and ZIF-8 with enhanced photocatalytic activity via effective defect

CrystEngComm ◽  
2020 ◽  
Vol 22 (25) ◽  
pp. 4250-4259
Author(s):  
Xiaoxue Qi ◽  
Feng Shang ◽  
Tao Wang ◽  
Yuqin Ma ◽  
Yongsheng Yan
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancies ◽  
Simple Method ◽  
Composite Photocatalyst

A composite photocatalyst was obtained by coupling ZIF-8 and TiO2(B) via a simple method, which showed the enhanced photocatalytic due to the oxygen vacancies/Ti3+.

In situ synthesis of Cl-doped Bi2O2CO3 and its enhancement of photocatalytic activity by inducing generation of oxygen vacancies

2020 ◽  
Vol 7 (16) ◽  
pp. 2969-2978
Author(s):  
Jie-hao Li ◽  
Jie Ren ◽  
Ying Liu ◽  
Hui-ying Mu ◽  
Rui-hong Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Ionic Liquids ◽  
Oxygen Vacancy ◽  
Oxygen Vacancies ◽  
In Situ Synthesis ◽  
Photocatalytic Mechanism

Cl-Doped Bi2O2CO3 is prepared using ionic liquids as dopants and the oxygen-vacancy-induced photocatalytic mechanism is revealed.

In-situ growth of TiO2 phase junction nanorods with Ti3+ and oxygen vacancies to enhance photocatalytic activity

2021 ◽  
Vol 140 ◽  
pp. 111291 ◽  
Author(s):  
Zhonghao Ji ◽  
Jiang Wu ◽  
Tao Jia ◽  
Cheng Peng ◽  
Yixuan Xiao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancies ◽  
In Situ Growth ◽  
Tio2 Phase

scholarly journals Enhancing Photocatalytic Activity of NO Removal through an In Situ Control of Oxygen Vacancies in Growth of TiO 2

2019 ◽  
Vol 6 (19) ◽  
pp. 1901032 ◽  
Author(s):  
Xiaoling Shen ◽  
Guohui Dong ◽  
Lan Wang ◽  
Liqun Ye ◽  
Jianwu Sun
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancies ◽  
No Removal ◽  
In Situ Control

scholarly journals Ag2S quantum dots in situ coupled to hexagonal SnS2 with enhanced photocatalytic activity for MO and Cr(vi) removal

RSC Advances ◽  
2017 ◽  
Vol 7 (74) ◽  
pp. 46823-46831 ◽  
Author(s):  
Jie Liu ◽  
Liquan Jing ◽  
Guofang Gao ◽  
Yuanguo Xu ◽  
Meng Xie ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Composite Photocatalyst ◽  
Highly Efficient ◽  
Visible Light Driven ◽  
Ag2s Quantum Dots

A highly efficient visible-light-driven composite photocatalyst of Ag2S quantum dots coupled to hexagonal SnS2 exhibited considerably increased photocatalytic activity for MO and Cr(vi) removal.

scholarly journals In Situ g-C3N4@Zno Nanocomposite: One-Pot Hydrothermal Synthesis and Photocatalytic Performance under Visible Light Irradiation

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Lan Anh Luu Thi ◽  
Mateus Manuel Neto ◽  
Thang Pham Van ◽  
Trung Nguyen Ngoc ◽  
Tuyet Mai Nguyen Thi ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
High Efficiency ◽  
Diffuse Reflectance Spectroscopy ◽  
Light Irradiation ◽  
Nitrate Hexahydrate ◽  
One Pot ◽  
Simple Method

In situ g-C3N4@ZnO nanocomposites (with 0, 1, 3, 5, and 7 wt.% of g-C3N4 in nanocomposite) were synthesized via a one-pot hydrothermal method using precursors of urea, zinc nitrate hexahydrate, and hexamethylenetetramine. The g-C3N4@ZnO nanocomposites were characterized by X-ray diffraction, scanning electron microscope, diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The photocatalyst activity of g-C3N4@ZnO nanocomposites was evaluated via methylene blue degradation experiment under visible light irradiation. The g-C3N4@ZnO nanocomposites showed an enhancement in photocatalytic activity in comparison to pure ZnO which increased with the g-C3N4 content (1, 3, 5, and 7 wt.%) in nanocomposites. The photocatalytic activity reached the highest efficiency of 96.8% when the content of g-C3N4 was 7.0 wt.%. Nanocomposite having 7.0 wt.% of g-C3N4 also showed good recyclability with degradation efficiency higher than 90% even in the 4th use. The improvement of photocatalytic activity could be attributed to the adsorption ability and effective separation of electron-hole pairs between g-C3N4 and ZnO. This work implies a simple method to in situ prepare the nanocomposite material of g-C3N4 and semiconductors oxide for photocatalyst applications with high efficiency and good recyclability.

scholarly journals Enhancing Photocatalytic Activity of NO Removal through an In Situ Control of Oxygen Vacancies in Growth of TiO 2

2019 ◽  
Vol 6 (23) ◽  
pp. 1901614 ◽  
Author(s):  
Xiaoling Shen ◽  
Guohui Dong ◽  
Lan Wang ◽  
Liqun Ye ◽  
Jianwu Sun
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancies ◽  
No Removal ◽  
In Situ Control

scholarly journals Bi/BiOCl Nanosheets Enriched with Oxygen Vacancies to Enhance Photocatalytic CO2 Reduction

2021 ◽  
Author(s):  
Shuqi Wu ◽  
Junbu Wang ◽  
Qingchuan Li ◽  
Zeai Huang ◽  
Zhiqiang Rao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Noble Metals ◽  
Oxygen Vacancies ◽  
Separation Efficiency ◽  
Co2 Reduction ◽  
Photogenerated Electron ◽  
In Situ Reduction ◽  
Electron Hole

AbstractBiOCl has been used in the photoreduction of CO2, but exhibits limited photocatalytic activity. In this study, Bi was in situ reduced and deposited on the surface of (001)-dominated BiOCl nanosheets by NaBH4 to form Bi/BiOCl nanosheets enriched with oxygen vacancies. The as-prepared Bi/BiOCl nanosheets having low thickness (ca. 10 nm) showed much higher concentration of oxygen vacancies compared to Bi/BiOCl nanoplates having high thickness (ca. 100 nm). Subsequently, the photocatalytic activity of the Bi/BiOCl nanosheets enriched with oxygen vacancies for CO2 reduction was dramatically enhanced and much higher than that of BiOCl nanoplates, nanosheets, and Bi/BiOCl nanoplates. It showed that the improved photocatalytic activity in the reduction of CO2 can be attributed to the enhanced separation efficiency of photogenerated electron–hole pairs of the oxygen vacancies on BiOCl nanosheets and Bi metals. This work demonstrated that the in situ reduction of non-noble metals on the surface of BiOCl nanosheets that are enriched with oxygen vacancies is favorable for increasing photocatalytic CO2 reduction.

scholarly journals Ethanol-Quenching Introduced Oxygen Vacancies in Strontium Titanate Surface and the Enhanced Photocatalytic Activity

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 883 ◽  
Author(s):  
Yang Xiao ◽  
Shihao Chen ◽  
Yinhai Wang ◽  
Zhengfa Hu ◽  
Hui Zhao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Localized States ◽  
Photoelectron Spectra ◽  
Infrared Light ◽  
Universal Method ◽  
High Concentration ◽  
Simple Method ◽  
X Ray

Modification of the surface properties of SrTiO3 crystals by regulating the reaction environment in order to improve the photocatalytic activity has been widely studied. However, the development of a facile, effective, and universal method to improve the photocatalytic activity of these crystals remains an enormous challenge. We have developed a simple method to modify the surface environment of SrTiO3 by ethanol quenching, which results in enhanced UV, visible and infrared light absorption and photocatalytic performance. The SrTiO3 nanocrystals were preheated to 800 °C and immediately quenched by submersion in ethanol. X-ray diffraction patterns, electron paramagnetic resonance spectra, and X-ray photoelectron spectra indicated that upon rapid ethanol quenching, the interaction between hot SrTiO3 and ethanol led to the introduction of a high concentration of oxygen vacancies on the surface of the SrTiO3 lattice. Consequently, to maintain the regional charge balance of SrTiO3, Sr2+ could be substituted for Ti4+. Moreover, oxygen vacancies induced localized states into the band gap of the modified SrTiO3 and acted as photoinduced charge traps, thus promoting the photocatalytic activity. The improved photocatalytic performance of the modified SrTiO3 was demonstrated by using it for the decomposition of rhodamine B and production of H2 from water under visible or solar light.

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