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

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.