Formation mechanism of lamellar BiOBr and its photocatalytic degradation of antibiotics
Bismuth oxybromide (BiOBr) particles with lamellar structure was synthesized by hydrothermal synthesis.X-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that BiOBr was successfully prepared,and its formation mechanism was investigated.The effect of structural changes on the photocatalytic performance of BiOBr was investigated using quinolone antibiotic norfloxacin (NOR) as a degradation substrate under xenon light illumination.The results show that the BiOBr prepared under hydrothermal conditions has a sheet-like structure.As the solution pH value increases,the size of the BiOBr becomes smaller and the dispersion becomes worse,the absorption band edge is blue-shifted,and the forbidden band width becomes larger.The growth mechanism of lamellar BiOBr in water solvent environ-ment is obtained,and it is proved that when the pH=1,the BiOBr-1ph sample prepared as uniform lame-llar structure with a width of (3-5) μm and a band gap of 2.93 eV shows the best photocatalytic acti-vity.The degradation of NOR over the above catalyst is 87.2％ after 60 min of reaction,and the best deg-radation rate constant is 3.31 × 10-2 min-1 .
catalytic chemistrybismuth oxybromidelayered structureformation mechanismphotocatalysiskinetic model
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维普
