Efficient catalytic activity of BiVO4 nanostructures by crystal facet regulation for environmental remediation

Enhanced visible light photocatalytic performance of Er, Mn co-doped monoclinic BiVO4 for efficient organic pollutant degradation

“…However, the electrostatic attraction force between the negatively charged RhB and the positively charged Er 6% Mn 2% /BiVO 4 can promote the accumulation of RhB on the surface of the photocatalyst. 44 This demonstrates that the electrostatic force plays a vital factor in the photocatalytic activity of Er 6% Mn 2% /BiVO 4 on the degradation of RhB. Finally, Er 6% Mn 2% /BiVO 4 was observed to exhibit the best photocatalytic activity under optimal conditions of (a) a photocatalyst concentration of 2.0 g L −1 , (b) a solution with pH 2, and (c) an irradiation time of 60 min.…”

“…10 The h + located at the VB edge of Er 6% Mn 2% /BiVO 4 cannot oxidize the adsorbed H 2 O to produce ·OH because the VB edge of Er 6% Mn 2% /BiVO 4 (2.02 eV) is more negative than the standard redox potential of ·OH/H 2 O (2.80 eV vs. NHE). 11,44 The photogenerated holes on the VB of Er 6% Mn 2% /BiVO 4 possesses strong oxidation capacity and can participate directly in the photocatalytic degradation of RhB. 44 The ·O 2 − and h + active species generated in Er 6% Mn 2% /BiVO 4 participate in the redox reaction of RhB under visible light, ultimately resulting in its photocatalytic degradation of RhB (eqn (8) and (9)).…”

“…This decline can be attributed to the agglomeration of the photocatalyst at excessive concentration levels, which inhibits light penetration and reduces the surficial active sites of photon absorption. 43,44 Based on the results, the optimal concentration of Er 6% Mn 2% /BiVO 4 for practical applications is determined to be 2.0 g L −1 .…”

Improved photoredox activity of the 2D Bi4Ti3O12–BiVO4–Bi4V2O10 heterostructure via the piezoelectricity-enhanced charge transfer effect

“…Bare 2D BiVO 4 exhibited a visible-light absorption range below 510 nm because of the transition of electrons from Bi 6s to V 3d corresponding to visible light. 44,45 After the BTO was coupled with BVO, the absorption edges of the BTO/BVO heterostructure showed a slight red-shift with the decreasing content of BTO, resulting from the absorption capacity of visible-light contributed by BiVO 4 . As presented in Fig.…”

Estudo da formação de partículas de vanadato de bismuto via síntese hidrotérmica: avaliação da eficiência na conversão fotocatalítica de >i<CO>sub<2>/sub<>/i<

“…Este comportamento foi esperado devido ao fato de haver uma menor concentração de íons H + que facilita a concentração livre de íons BiO + e V O − 3 , responsáveis pela formação das partículas de BiV O 4 , melhorando o processo de cristalização . Além de apresentar uma taxa de nucleação mais rápida, um pH mais alto produz partículas maiores (54,99). Não há variação significativa na espessura das amostras.…”