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The visible light photocatalytic activity of two-dimensional(2D) BiOI microplates was intensively enhanced through simply dipping in Na_2CO_3 solutions at room temperature. The X-ray powder diffraction(XRD) and scanning electron microscopy(SEM) investigations suggest that little amount of(BiO)_2CO_3phase was formed on the surface of 2D BiOI via the in situ chemical conversion. The concentration of Na_2CO_3 solutions affected the structure, morphology, light absorption and surface element component of 2D BiOI. The surface loaded(BiO)_2CO_3mainly trapped the photoinduced electrons of BiOI, improved the separation efficiency of photocharges and finally raised the photocatalytic activity of BiOI under visible light(k > 420 nm). Furthermore, the product of the as-prepared(BiO)_2CO_3/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 Na_2CO_3 solutions.
The visible light photocatalytic activity of two-dimensional (2D) BiOI microplates was intensively enhanced by simply dipping in Na_2CO_3 solutions at room temperature. The X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) investigations suggest that little amount of ( BiO) _2CO_3phase was formed on the surface of 2D BiO via the in situ chemical conversion. The concentration of Na_2CO_3 solutions affected the structure, morphology, light absorption and surface element component of 2D BiOI. The surface loaded (BiO) _2CO_3mainly trapped the photoinduced electrons of BiOI, improved the separation efficiency of photocharges and finally raised the photocatalytic activity of BiOI under visible light (k> 420 nm). Further, the product of the as-prepared (BiO) _2CO_3 / 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 Na_2CO_3 solutions .