Surface Na2CO3 etching induced activity enhancement of 2D BiOI photocatalyst working under visible light

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2017,（8）
• 页码范围: 546-553
• 页数: 8页
• 语种: 英文

摘要

The visible light photocatalytic activity of two-dimensional (2D) BiOI microplates was intensively enhanced through simply dipping in Na2CO3 solutions at room temperature.The X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) investigations suggest that little amount of (BiO)2CO3 phase was formed on the surface of 2D BiOI via the in situ chemical conversion.The concentration of Na2CO3 solutions affected the structure,morphology,light absorption and surface element component of 2D BiOI.The surface loaded (BiO)2CO3 mainly trapped the photoinduced electrons of BiOI,improved the separation efficiency of photocharges and finally raised the photocatalytic activity of BiOI under visible light (λ ＞ 420 nm).Furthermore,the product of the as-prepared (BiO)2CO3/BiOI displayed excellent stability in the repeated experiment.This study provides a facile way to improve the photocatalytic activity of BiOX (X =Cl,Br,I) by means of surface treatment with Na2CO3 solutions.