Cobalt-doped V2O5 hexagonal nanosheets for superior photocatalytic toxic pollutants degradation, Cr (VI) reduction, and photoelectrochemical water oxidation performance

Rui Wang; Ch Venkata Reddy; Bhusankar Talluri; Raghava Reddy Kakarla; Rustem R Zairov; Jaesool Shim; Tejraj M Aminabhavi

doi:10.1016/j.envres.2022.114923

Cobalt-doped V₂O₅ hexagonal nanosheets for superior photocatalytic toxic pollutants degradation, Cr (VI) reduction, and photoelectrochemical water oxidation performance

Environ Res. 2023 Jan 15:217:114923. doi: 10.1016/j.envres.2022.114923. Epub 2022 Nov 23.

Authors

Rui Wang¹, Ch Venkata Reddy¹, Bhusankar Talluri², Raghava Reddy Kakarla³, Rustem R Zairov⁴, Jaesool Shim⁵, Tejraj M Aminabhavi⁶

Affiliations

¹ School of Mechanical Engineering, Yeungnam University, Gyeongsan, 712749, South Korea.
² Department of Metallurgical and Materials Engineering, IIT, Chennai, 600036, India.
³ School of Chemical and Biomolecular Engineering, The University of Sydney, NSW, 2006, Australia. Electronic address: raghava.kakarla@sydney.edu.au.
⁴ Aleksander Butlerov Institute of Chemistry, Kazan Federal University, Kazan, 420008, 1/29 Lobachevskogo Str., Russia.
⁵ School of Mechanical Engineering, Yeungnam University, Gyeongsan, 712749, South Korea. Electronic address: jshim@ynu.ac.kr.
⁶ School of Advanced Sciences, KLE Technological University, Hubballi, 580 031, Karnataka, India; University Center for Research and Development (UCRD), Chandigarh University, Gharuan, Mohali, 140413, Punjab, India. Electronic address: aminabhavit@gmail.com.

PMID: 36435491
DOI: 10.1016/j.envres.2022.114923

Abstract

The worldwide energy calamity and ecological disturbances demand materials that can remove harmful contaminants from the polluted water. Recently, semiconductor-based catalytic dye removal has created much consideration due to its high efficacy and eco-friendly contaminated water treatment processes. Vanadium oxide (V₂O₅) has attracted superior attention as a catalyst due to its robust oxidation power, chemical inertness, and stability against photodegradation. In this study, pristine and cobalt (Co)-doped V₂O₅ samples were synthesized by solvothermal method and examined for their photo-degradation activity and photoelectrochemical (PEC) water oxidation properties. The orthorhombic crystal phase was confirmed by X-ray diffraction (XRD), hexagonal-shaped morphology was observed by scanning electron microscope (SEM) and reduced optical band gap (2.01 eV) was noticed for doped V₂O₅ catalyst compared to the pristine (2.20 eV) catalyst. The doped V₂O₅ catalyst exhibited enhanced photodegradation of crystal violet CV (92.7%) and Cr (VI) reduction (90.5%) after 100 min of light irradiation. The doped photocatalyst exhibited approximately 2.1 and 1.9-fold enhancement of photodegradation of CV and Cr(VI) reduction, respectively. The doped electrode showed improved photocurrent density (0.54 mA/cm^-2) compared to pristine electrode (0.12 mA/cm^-2). Moreover, the doped electrode showed reduced charge-transfer resistance and enhanced charge-transfer properties compared to those of the pristine electrode. Hence, the prepared hexagonal-shaped V₂O₅ is a suitable material for the elimination of environmental contaminants from the polluted water as well as water splitting for hydrogen generation.

Keywords: Co-doped V(2)O(5); Environmental remediation; Hexagonal-shaped V(2)O(5); Organic dye degradation; PEC Water oxidation; Photocatalysis; Photoelectrochemistry; Water treatment.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Catalysis
Cobalt*
Environmental Pollutants*
Oxidation-Reduction
Oxides / chemistry
Photolysis

Substances

Cobalt
Environmental Pollutants
Oxides