Novel Three-Dimensional Flowerlike BiOBr/Bi₂SiO₅ p–n Heterostructured Nanocomposite for Degradation of Tetracycline: Enhanced Visible Light Photocatalytic Activity and Mechanism

Abstract

Fabricating p−n heterojunction structure is an effective approach to improve the separation efficiency of carriers in photocatalysts for degradation of organic pollutants. Herein, a novel 3D p−n heterostructured BiOBr/Bi 2 SiO 5 nanosheet composite is fabricated successfully. The obtained BiOBr/Bi 2 SiO 5 nanosheet composites exhibit higher visiblelight photocatalytic efficiency for degrading tetracycline (TC), which is 3.6 times higher than BiOBr. Furthermore, the composite could still maintain good activity for photocatalytic degradation of TC after five recycles. The active species in the photocatalytic system are •OH, •O 2 − , and h + , which are proved by trapping experiments and electron spin resonance (ESR) analysis. We demonstrate that the enhanced photocatalytic activity of BiOBr/Bi 2 SiO 5 nanocomposites is due to the formation of p−n junction, which supports the generation of •O 2 − and •OH. The photocatalytic mechanism of BiOBr/Bi 2 SiO 5 composites for the degradation of TC is also proposed.

Novel P-n Li2SnO3/g-C3N4 Heterojunction With Enhanced Visible Light Photocatalytic Efficiency Toward Rhodamine B Degradation

“…Among the best known classes of such catalysts are p-n heterojunctions, which have been extensively studied to optimize their photocatalytic activity. Their catalytic mechanism is based on an internal electric field established at the interface of the p-n junction, which promotes the efficient separation of photogenerated carriers Dong et al, 2018;Dursun et al, 2018;Wang et al, 2018;Zeng et al, 2019). The Mott-Schottky plots measured by electrochemistry demonstrate that Li 2 SnO 3 is a p-type semiconductor.…”

In Situ Synthesis of 3D Pt/CdS/ Hydrogenated BiOBr Microspheres with Enhanced Visible Light Photocatalytic Activity

“…As shown (Figure ), the resistances of BiOBr, h‐BiOBr, h‐BiOBr/CdS and Pt/h‐BiOBr/CdS decrease sequentially. Pt/h‐BiOBr/CdS has the lowest arc radius in all samples owing to synergistic effect of the formation of heterostructure and SPR effect ,…”

Defect induced “super mop” like behaviour of Eu3+-doped hierarchical Bi2SiO5nanoparticles for improved catalytic and adsorptive behaviour

“…As BSO is known to be a direct bandgap semiconductor, the bandgap was calculated from the intercept of the slope at x-axis for the plot between (F(R)hn) 4/2 and hn at F(R) = 0. 28 The calculated bandgap of BSO nanoparticles is 3.62 eV as shown in Fig. S11b (ESI †).…”

“…The available reports show that high temperatures, long reaction times (B48 hours), and tedious post-synthesis protocols have been employed. [28][29][30][31][32][33] This has motivated us to develop a low-cost strategy to produce monoclinic or orthorhombic BSO with superior structural properties at lower reaction temperatures and time. Moreover, the as-synthesized BSO must be a ''super-mop'', i.e.…”