Visible light activity of Bi2WO6@TCNQ with core–shell structure in phenol degradation

Abstract

Bi₂WO₆@TCNQ visible light photocatalyst with a core–shell structure was synthesized by adsorption methods. The core–shell structure results in the fast transfer of photogenerated carriers, reduced carrier recombination and photogenerated holes on the HOMO level of TCNQ can be injected into the VB of Bi₂WO₆ under visible light irradiation, resulting in the direct oxidation of organic pollutants. The photocatalytic activity of Bi₂WO₆@TCNQ was gradually enhanced with an increasing proportion of TCNQ. When the mass fraction of TCNQ reaches 0.5%, it exhibits the highest visible light activity. The apparent rate constant k of Bi₂WO₆@TCNQ-0.5% is almost 2.2 times as high as that of pure Bi₂WO₆.