Unusual reactivity of visible-light-responsive AgBr–BiOBr heterojunction photocatalysts

Microwave-assisted synthesis of a superfine Ag/AgI photocatalyst with high activity and excellent durability

“…The observed result was caused by the formation of a series of N-de-ethylated intermediates in a stepwise manner [32], such as N-ethyl-Nethylrhodamine, N,N-diethyl-N-ethylrhodamine, N-ethylrhodamine, N,N-diethylrhodamine, and rhodamine [33]. Similar trends were also observed in literature for AgBrBiOBr/RhB [34] and Bi 2 WO 6 -Fe 3 O 4 /RhB [35] systems. In order to investigate the relationship between sample composition and photocatalytic activity, the activities of the four Ag/AgI samples prepared at various microwave irradiation times were compared.…”

Enhanced photocatalytic performance of g-C3N4 nanosheets–BiOBr hybrids

“…Two peaks in Br 3d spectrum at 68.2 eV and 69.3 eV are relevant to Br 3d 5/2 and Br 3d 3/2 in pure BiOBr crystal network. Two signals in Bi 4f spectrum centered at 159.3 eV and 164.6 eV are associated to Bi 4f 7/2 and Bi 4f 5/2 in pure BiOBr, respectively [11,17]. It is apparent that intensity ratio of C 1s peaks at 287.8 eV and 288.3 eV to 284.8 eV in 0.5CNs-BiOBr hybrid is relatively low in comparison to that of pure CNs, thanking to the relatively low content of CNs contained [43], which is in good accordance with the XRD pattern.…”

“…In addition, shrinkage of band gap of CNs-BiOBr is obtained by combining with BiOBr, leading to the enhancement of catalytic efficiency compared with CNs. On the other hand, appreciate mass ratio of CNs to BiOBr is crucial to construct CNs-BiOBr heterojunctions that are featured with good dispersion and intimate contact of both components [17]. Through smooth interfaces along phase boundaries in well-matched band structure, electron and holes tends to transfer and accumulate in different components, greatly inhibiting recombination possibility and raising photocatalytic efficiency.…”

“…The first one is to synthesize pure BiOBr with various architectures, such as lamellas, hierarchical microspheres, microflowers, mesoporous microspheres, and self-assembled 3-D architectures [10][11][12][13][14]. Another alternative is relevant to the fabrication of BiOBr hybrids with other semiconductors of suitable energy-band structures and the obtained hybrids normally own unique optical and catalytic properties, thanking to the formation of a positive synergistic effect between these ingredients [15][16][17][18][19].…”

Hydrothermal synthesis of visible-light-driven hierarchical Bi3.84W0.16O6.24 photocatalysts toward efficient degradation of methyl orange

“…Also remarkably, other Bi 3.84 W 0.16-O 6.24 samples all exhibit stronger photocatalytic properties than the as-prepared TiO 2 , and even higher than the commercial P25 with the same experiment parameters, which are probably related to the rich oxygen vacancies in Bi 3.84 W 0.16 O 6.24 and the deactivation of TiO 2 (Luttrell et al 2014;Nakata and Fujishima 2012). The oxygen vacancies benefit for the effective separation of the photo-excited carriers and depress the recombination of the photo-excited electron-hole pairs meanwhile (Xiang et al 2012;Liu et al 2009;Kong et al 2012), while the adsorption of intermediates onto the TiO 2 surface may often cause the deactivation of the TiO 2 (Kong et al 2012), and the two factors synergistically contribute to the stronger photocatalytic activity of the Bi 3.84 W 0.16 O 6.24 samples than that for the TiO 2 .…”