The synthesis of a BiOCl_xBr_1−x nanostructure photocatalyst with high surface area for the enhanced visible-light photocatalytic reduction of Cr(vi)

Abstract

Cr(vi) reduction is performed by BiOCl0.8Br0.2 composite produced via a facile in situ synthetic process at room temperature while making use of PVP (Mw = 10 000).

Fast Scalable Synthetic Methodology to Prepare Nanoflower‐Shaped Bi/BiOClxBr1−x Heterojunction for Efficient Immobilized Photocatalytic Reactors under Visible Light Irradiation

“…The Bi/ BiOCl 0.8 Br 0.2 film had the lowest emission intensity among the as-prepared Bi/BiOCl x Br 1−x films as a result of the synergic effect of its 3D flower-like nanostructure, the formation of Bi/ BiOCl x Br 1−x heterojunction, and the presence of oxygen vacancies, leading to a longer lifetime of the charge carriers. [18,42] This observation was further confirmed by recording the photocurrent of the as-prepared films. Generally, a stronger photocurrent response suggests the effective separation of photogenerated electron-hole pairs.…”

“…The Bi/BiOCl 0.8 Br 0.2 film exhibited the highest photocurrent responses compared to its counterparts, highlighting its outstanding separation of the photoinduced charge at the interface and thus its superior photocatalytic performance. [ 18 ]…”

“…[16,17] Consequently, the integration of the desired characteristics of individual BiOXs in one photocatalytic compound is an effective strategy to produce more efficient BiOXs-based photocatalytic systems. For example, alloyed compounds (i.e., solid solutions) of BiOXs which contain more than one halogen atom in the compound through changes in the molar ratios of halogen atoms such as BiOCl x Br 1−x , [18,19] BiOCl x I 1−x , [20,21] and BiOBr x I 1−x . [22,23] have the same layered atomic structure, leading to the easy arrangement of different halogen atoms into the lattice of solid solutions using a low-energy fabrication process.…”

Morphology Regulation Mechanism and Enhancement of Photocatalytic Performance of BiOX (X = Cl, Br, I) via Mannitol-Assisted Synthesis

“…Additionally, the enhanced photoreduction of Cr(VI) in the presence of irradiated BiOX could be attributed to the strong adsorption on the photocatalyst's surface, which was obtained by the use of mannitol for synthesis. The previously reported surfactants addition to the BiOX synthesis [35,52] and BiOX modifications [53] did not elevate the Cr(VI) adsorption on the photocatalyst surface to such an extent. Based on the results obtained, it could be concluded that the mannitol used in the synthesis as a template and capping agent played a crucial role in the exposure of (110) plane of BiOX (X = Cl, Br, I) and the creation of defects.…”

Room temperature synthesis of BiOBr1−xIx thin films with tunable structure and conductivity type for enhanced photoelectric performance

“…19,20 In addition, within ion doping, selfdoping of halogens (Cl, Br, I) is an effective method to strengthen the visible light utilization and overcome the drawback of the high recombination rate of electron-hole pairs. In particular, BiOM x R 1Àx (M, R ¼ Cl, Br, I) composite systems have been recently synthesized, such as BiOCl x I 1Àx , 21 BiOBr x I 1Àx , 22 BiOCl x Br 1Àx , 23,24 BiOI x Br (1Àx) 25 and BiO(ClBr) (1Àx)/2 I x , 26 which showed higher photocatalytic activities than the corresponding single components. For instance, Jia et al synthesized a solid solution of BiOBr x I 1Àx and demonstrated its visible-lightinduced photocatalytic properties.…”