Photocatalytic degradation of bisphenol A by oxygen-rich and highly visible-light responsive Bi12O17Cl2 nanobelts

Abstract

Visible light responsive photocatalysts can directly harvest energy from solar light, offering a desirable way to resolve environmental pollution problems through utilizing solar energy. Bismuth oxychloride (BiOCl) with a band gap of about 3.4eV is widely recognized as an effective photocatalyst for the degradation of organic dye molecules under visible light irradiation, but such a photocatalytic degradation has to be assisted by dye-sensitization. Thus, preparation of BiOCl photocatalyst to achieve visible light response without dye-sensitization is greatly desired, as this would greatly expand their practical applications for the degradation of non-dye pollutants. In this work, oxygen-rich Bi12O17Cl2 nanobelts with a band gap of 2.07eV were synthesized by using a solvothermal route, and their photocatalytic performance was evaluated through photodegrading a colorless contaminant bisphenol A (BPA) in an aqueous solution. In comparison with BiOCl, which is not sensitive to visible light, the oxygen-rich Bi12O17Cl2 nanobelts exhibited a drastically enhanced visible-light photoreactivity and were also superior to the well-known photocatalyst TiO2 (P25). The greatly enhanced photocatalytic performance of the Bi12O17Cl2 nanobelts was attributed to their efficient visible light absorption. Our findings might be helpful to explore visible light bismuth-based photocatalysts for pollutant degradation and water treatment.