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Mannitol ligand-assisted assembly of BiOBr photocatalyst in the cationic micelles of cetylpyridinium bromide

Paper ID Volume ID Publish Year Pages File Format Full-Text
49560 46753 2016 5 PDF Available
Title
Mannitol ligand-assisted assembly of BiOBr photocatalyst in the cationic micelles of cetylpyridinium bromide
Abstract

•Ligand-assisted assembly of BiOBr photocatalyst with mannitol as the complexing agent is proposed•Complexation of Bi3 + limits the formation of BiO+ and controls crystal growth.•Surface area was double that of the control and it activated O2 at triple the rate.

This is the first report on ligand-assisted assembly of BiOBr. BiOBr, using cetylpyridinium bromide (CPB) as Br source and surface template, was prepared with water with the presence of three polyhydroxyl alcohols. Based on SEM, HR-TEM and XRD, mannitol results in different particle morphologies. Rather than smooth microspheres, projections form that double surface area. BiOBr prepared in mannitol displayed the highest photocatalytic activity and tripled the oxygen consumption rate compared to the other preparations. The Bi3 +–mannitol complex competes with hydroxide for Bi3 + in the CPB micelles and limits the availability of BiO+, altering the assembly process. A four-step mechanism for ligand-assisted assembly of BiOBr in mannitol is proposed.

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Keywords
BiOBr; Ligand-assisted assembly; Photocatalysis; CPB micelles; Photodegradation
First Page Preview
Mannitol ligand-assisted assembly of BiOBr photocatalyst in the cationic micelles of cetylpyridinium bromide
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 80, 5 May 2016, Pages 15–19
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis