Formation of BiOX (X = Cl and Br) in a mesoporous silica by the infiltration of Bi salts and the subsequent reaction with HX vapor

Abstract

The formation of BiOX (X=Br and Cl) nanoparticles in a mesoporous silica (SBA-15) was found by the reaction of the infiltrated bismuth oxo species with HX vapor at room temperature....

Designed Nanoarchitectures of a BiOBr/BiOI Nanosheet Heterojunction Anchored on Dendritic Fibrous Nanosilica as Visible-Light Responsive Photocatalysts

“…Thus, the reaction of Bi 2 O 3 nanoparticles with HBr vapor was successfully utilized to prepare BiOX nanoparticles on DFNS. 25,26,31,32 The XRD patterns of DFNS-Bi 2 O 3 −HIs (Figure S3) did not show any peaks. The Raman spectra of DFNS-Bi 2 O 3 −HIs (Figure 4A 6C,D and E,F, respectively).…”

“…BiOBr sheets of several hundreds of nanometers were formed separately from DFNS, as shown by the SEM image and EDS elemental mapping (Figure B–E). Thus, the reaction of Bi 2 O 3 nanoparticles with HBr vapor was successfully utilized to prepare BiOX nanoparticles on DFNS. ,,, …”

“…32 In order to confine the BiOX within the pore, multiple loading steps were required. 29,32 The loading amount of the BiOX nanoparticles was low (∼5 wt % BiOX, X�Cl, Br). 32 Despite the remarkable potential exhibited by bismuth oxyhalides, several challenges persist in harnessing their full catalytic and photocatalytic capabilities.…”

“…Accordingly, the preparation of BiOX nanoparticles in/on mesoporous silicas has been achieved by the reaction of bismuth salt or halide salt (NaX or KX) in aqueous systems. − Drawbacks related to the reported impregnation methods included uncontrolled loading and location, whether formed nanoparticles were immobilized in the pore or deposited on the external surface of the porous template − , and even formed separately, which were attributed to the clogging and overflow of the precursors. As an alternative way, the reaction of bismuth oxo species in SBA-15 with HX vapors at room temperature was reported to obtain BiOX nanospheres/rods in SBA-15 . In order to confine the BiOX within the pore, multiple loading steps were required. , The loading amount of the BiOX nanoparticles was low (∼5 wt % BiOX, XCl, Br) …”

Well-Defined Single and Bundled Rutile Nanorods in Mesoporous Silica for Efficient Hydrogen Evolution Photocatalysis

“…Shape and size-controlled synthesis of nanoparticles has been a topic of interest because of their useful shape- and size-dependent phenomena. − The preparation of nanoparticles in the confined nanospaces of porous solids has been done extensively in order to control their shape and size. − Among the porous solids available as template, periodic mesoporous silicas (abbreviated as PMSs) have presented attractive characteristic features such as well-defined and variable pore shape and size, pore connection, chemical and thermal stability, and reactivity of the pore surface due to the silanol group. − PMSs have been used extensively for the preparation of semiconductor and metallic nanoparticles − in various shapes such as sphere, rod, and tube, as well as the replica of mesoporous particles with carbons, , polymers, , metals, − metal and mixed metal chalcogenides, − and metal nitrides. , …”