Preparation and first-principles study for electronic structures of BiOI/BiOCl composites with highly improved photocatalytic and adsorption performances

• Synthesis of BiOI/BiOCl via ionic liquid assisted ultrasonic method at room temperature.
• High photoactivities for the degradation of organic pollutants under visible light irradiation.
• Composite electronic structures of was explicated by a first-principles investigation.

The BiOI/BiOCl composites with high photocatalyitic and adsorption ablities were prepared via a facile ionic liquid assisted ultrasonic method in several hours at room temperature. The BiOI/BiOCl composites with different contents of BiOI can be conveniently synthesized via changing the amount of 1-ethyl-3-methylimidazolium iodide precursor during the preparation process. Microstructures, morphologies, porosities and bandgaps of the as-prepared samples were determined through various experimental methods. A first-principles calculation was employed to explicate electronic structures of the complex. Photocatalytic results suggest that the obtained BiOI/BiOCl composite with 40% BiOI has the highest photoactivity for the degradation of rhodamine-B and quinoline blue under visible light irradiation. All the rhodamine-B and quinoline blue can be degraded in 25 min and 15 min, respectively. To observe the universality of the BiOI/BiOCl, the degradation results of colorless target pollutant (tetracycline) was also investigated. Based on experimental and computational results, origins of the photocatalytic abilities leading to the observed results were proposed.

BiOI/BiOCl composites with highly improved photocatalytic and adsorption performances were preapred via a facile method namely ionic liquid assisted ultrasonic method in several hours at room temperature.Figure optionsDownload high-quality image (183 K)Download as PowerPoint slide