Surface microenvironment engineering of black V<sub>2</sub>O<sub>5</sub> nanostructures for visible light photodegradation of methylene blue
<p dir="ltr">Utilization of photocatalysis as a promising strategy for environmental and energy applications has been widely considered. Herein, we report a novel black V<sub>2</sub>O<sub>5</sub> material (bV<sub>2</sub>O<sub>5</sub>) s...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | , , , , , |
| Published: |
2021
|
| Subjects: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | <p dir="ltr">Utilization of photocatalysis as a promising strategy for environmental and energy applications has been widely considered. Herein, we report a novel black V<sub>2</sub>O<sub>5</sub> material (bV<sub>2</sub>O<sub>5</sub>) synthesized using a controllable and environmentally benign physicochemical reduction method. HRTEM, ESEM, EDX. Raman, XPS, XRD, and BET textural characterization, as well as computational density functional theory (DFT) techniques were employed to understand the chemical and electronic changes obtained through modulation of the surface microenvironment. DFT analyses reveal that tuning a high degree of surface oxygen vacancies considerably ameliorated visible light photoactivity of practically inactive pristine V<sub>2</sub>O<sub>5</sub>. The optimized bV<sub>2</sub>O<sub>5</sub> sample yielded 92% photodegradation of 20 mg/L cationic methylene blue (MB) in 60 min under visible light irradiation – corresponding to a 58-fold increase in photodegradation efficiency over pristine V<sub>2</sub>O<sub>5</sub>. Neutral quinoline yellow (QY) and anionic methyl orange (MO) photodegradation were also investigated to examine the photocatalytic efficacy of bV<sub>2</sub>O<sub>5</sub> for degradation of other organic contaminants with different charges. DFT calculations show a clear thermodynamic stability towards reduction of the predominant polar (001) facet at 1-coordinated oxygen surface site. A staggered (type-II) heterostructure between pristine and reduced V<sub>2</sub>O<sub>5</sub> was determined from band edge positions which is believed to promote the enhancement in photoactivity of the reduced sample by offering favorable electron-hole separation and allowing both hydroxyl and superoxide radical formation. The mechanism behind the formation of surface defects on bV<sub>2</sub>O<sub>5</sub> was proposed based on configurational changes.</p><h2>Other Information</h2><p dir="ltr">Published in: Journal of Alloys and Compounds<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.jallcom.2021.159615" target="_blank">https://dx.doi.org/10.1016/j.jallcom.2021.159615</a></p> |
|---|