Self-Assembly of a 3D Hollow BiOBr@Bi-MOF Heterostructure with Enhanced Photocatalytic Degradation of Dyes

Abstract

Considering the flexibility, adjustable pore structure, and abundant active sites of metal–organic frameworks (MOFs), rational design and fine control of the MOF-based hetero-nanocrystals is a highly important and challenging subject. In this work, self-assembly of a 3D hollow BiOBr@Bi-MOF microsphere was fabricated through precisely controlled dissociation kinetics of the self-sacrificial template (BiOBr) for the first time, where the residual quantity of BiOBr and the formation of Bi-MOF were carefully regulated by changing the reaction time and the capability of coordination. Meanwhile, the hollow microstructure was formed in BiOBr@Bi-MOF through the Oswald ripening mechanism to separate photogenerated electron–hole pairs and increase the adsorption capacity of Bi-MOF for dyes, which significantly enhanced the photocatalytic degradation efficiency of RhB from 56.4% for BiOBr to 99.4% for the optimal BiOBr@Bi-MOF microsphere. This research broadens the selectivity of semiconductor/MOF hetero-nanocrystals with reasonable design and flexible synthesis.

Hematite nanoparticles decorated nitrogen-doped reduced graphene oxide/graphitic carbon nitride multifunctional heterostructure photocatalyst towards environmental applications

“…The kinetic equation is given below. 70,71 where the initial Cr( vi ) concentration is C 0 , the final Cr( vi ) concentration is C t at time t , and the pseudo-first-order rate constant is k . Fig.…”

Modulation and self-assembly of nanoparticles into bismuth molybdate nanosheets as highly efficient photocatalysts for ciprofloxacin degradation

“…After illumination of 5 min, an obvious EPR four-component signal was observed, corresponding to the peak of DMPO–˙O 2 − , which suggested that the ˙O 2 − radicals were crucial to CIP degradation in the photocatalytic system, consistent with the results of the trapping experiments. It is noted that h + , ˙O 2 − and e − are involved in the photocatalytic degradation of CIP; h + , ˙O 2 − are the dominant active species in the photocatalytic degradation of RhB, 42 while ˙O 2 − is the main active species for MB and the surface hydroxyl group is efficient for phenol removal. 43,44 Thus, it can explain why the degradation rates of CIP and RhB are higher than that of MB and phenol because of different active species and surface charges.…”

“…− and e − are involved in the photocatalytic degradation of CIP; h + , ˙O2 − are the dominant active species in the photocatalytic degradation of RhB, 42 while ˙O2 − is the main active species for MB and the surface hydroxyl group is efficient for phenol removal. 43,44 Thus, it can explain why the degradation rates of CIP and RhB are higher than that of MB and phenol because of different active species and surface charges.…”

Conductive polymer mediated earth abundant Z-scheme g-C3N4/Fe2O3 heterostructure with excellent photocatalytic activity

“…3f; the ternary heterostructure possessed much higher N 2 uptake and specific surface area (S BET ) than that of g-C 3 N 4 , which was favorable to the improvement of the photocatalytic activity. 16,[37][38][39] The photocatalytic hydrogen production activities of g-C 3 N 4 and its heterostructures were tested under visible light irradiation and systematically compared in Fig. 5 to reveal the important synergistic effect of PPy and Fe 2 O 3 .…”