Photocatalytic Performance of Ta 2 O 5 /BiVO 4 Heterojunction for Hydrogen Production and Methylene Blue Photodegradation

Journal of the Brazilian Chemical Society

article

Gonçalves, Henrique B.¹  Freitas, Denilson V.¹  Souza, Emanuely J.¹  Melo, Mauricio A.²  Gonzalez-Moya, Johan R.³  Padrón-Hernández, Eduardo⁴  Khan, Sherdil⁵  Machado, Giovanna¹ 

[1] Centro de Tecnologias Estratégicas do Nordeste;Universidade Federal Fluminense;Florida International University;Universidade Federal de Pernambuco;Universidade Federal do Rio Grande do Sul

关键词: photocatalysis;    hydrogen;    n-n heterojunction;    tantalum dioxide;    photodegradation;   

DOI  :  10.21577/0103-5053.20220002

学科分类：内科医学

来源: SciELO

【 摘 要 】

Forming semiconductor heterojunction is promising for improved photocatalytic performance due to synergistic combination of the best properties of each material. The present study reports a simple hydrothermal strategy to form n-n heterojunction of Ta2O5 nanotubes and BiVO4 microstructures. The Ta2O5/BiVO4 heterojunctions were characterized by Raman spectroscopy, UV Vis diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and their photocatalytic activity was evaluated by hydrogen production and photodegradation of methylene blue (MB) dye in aqueous medium under AM 1.5 G (100 mW cm2) condition. The heterojunctions have optical absorption in the visible region (200 500 nm) with crystal structures defined as monoclinic for BiVO4 and orthogonal for Ta2O5. For MB photodegradation, the Ta2O5/BiVO4 obtained via hydrothermal route showed a photodegradation of 72.3%, compared to 28.3% presented by the sample produced through the mechanical mixture, with the maintenance of 86.4% of its photocatalytic performance after 3 cycles of photodegradation. For H2 production, hydrothermally prepared Ta2O5/BiVO4 generated 10.2 μmol g-1 of H2 in 3 h; while Ta2O5 nanotubes and mechanical Ta2O5/BiVO4 mixture shows 6.82 and 2.80 μmol g-1, respectively. The results suggest that Ta2O5/BiVO4 is a promising material for applications in photocatalysis, promoting sustainable energy production through hydrogen and for the treatment of effluents containing cationic dyes.

【 授权许可】

CC BY