Alkali-Induced in Situ Fabrication of Bi₂O₄-Decorated BiOBr Nanosheets with Excellent Photocatalytic Performance

Abstract

A simple alkali (NaOH) post-treatment approach assisted with light irradiation to in situ obtain Bi 2 O 4 nanoparticles decorated BiOBr nanosheets, brown colored BiOBr-0.01, is presented for the first time. Bi 2 O 4 nanoparticles are formed due to a combined action of NaOH induced dehalogenation and light triggered photogenerated hole (h + ) oxidation processes on the surface of BiOBr nanosheets. Importantly, by varying the NaOH concertation in the post-treatment, the content of Bi 2 O 4 phase in the hybrid structures can be easily tuned and predominantly exposed

Controlled synthesis of Bi2O3/BiOBr/Zn2GeO4 heterojunction photocatalysts with enhanced photocatalytic activity

“…It can be also found that in the final products from Bi 2 O 3 /BiOBr/Zn 2 GeO 4 ‐1 to Bi 2 O 3 /BiOBr/Zn 2 GeO 4 ‐3 with the increase in BiOBr addition, the diffraction intensity of Zn 2 GeO 4 diminished and peak of Bi 2 O 3 also decreased, whereas the peak intensity of (011) plane for BiOBr increased. An obvious intensity reverses of (011) and (110) peaks were observed, which might be caused by the different crystalline orientation of BiOBr, and could relate with the photocatalytic activity of the photocatalysts, as also found in other system …”

“…The lattice distance of 0.28 nm can be ascribed to the (110) crystallographic plane of BiOBr . The lattice distance of 0.32 nm corresponds to the (120) crystal plane Bi 2 O 3 QDs, which also support the phase formation of ternary Bi 2 O 3 /BiOBr/Zn 2 GeO 4 heterojunction.…”

Two‐dimensional nanomaterials for photocatalytic water disinfection: recent progress and future challenges

“…(a) TEM and (b) HRTEM of B001; (c) proposed mechanism of facet‐dependent bacterial inactivation by B001 nanosheets; copyright (2015) Royal Society of Chemistry; (d) proposed formation mechanism of BiOBr‐Br 2 O 4 nanosheets; SEM (e) and TEM (f) images of BiOBr‐Br 2 O 4 composite; copyright (2016) American Chemical Society.…”

“…After that, a series of exogenously doped and self‐doped photocatalysts were fabricated with the BiOBr nanosheets with a high percentage of {001} facets. Boron‐doped BiOBr (B‐BiOBr) was synthesized by adding H 3 BO 3 in the precursors of BiOBr before hydrothermal treatment .…”

“…In alkaline solution and under Xenon lamp, surface BiOBr was partially dehalogenated and oxidized to Bi 2 O 4 nanoparticles due to the combined effects of NaOH and light (Fig. (d)–(f)) . In comparison with pure BiOBr nanosheets, the BiOBr‐Br 2 O 4 composite exhibited much faster disinfection of 15 min towards 7‐log E. coli , while more than 4‐log bacteria remained after 20 min irradiation with only BiOBr.…”