Preparation and Performance of Visible‐Light‐Driven Bi₂O₃/ZnS Heterojunction Functionalized Porous CA Membranes for Effective Degradation of Rhodamine B

Abstract

Photocatalytic degradation is an effective method for fast removal of dye‐contaminated water. In the present work, a bismuth oxide/zinc sulfide‐cellulose acetate photocatalytic membrane (Bi2O3/ZnS‐CA) is successfully fabricated via the phase‐inversion method with a Bi2O3/ZnS heterojunction as the photocatalyst. The Bi2O3/ZnS‐CA membranes shows high photocatalytic activity in degradation of Rhodamine B (RhB) under visible‐light irradiation due to the Bi2O3/ZnS heterojunction structure contributing to the high efficiency of photogenerated charge separation. The photodegradation efficiency of Bi2O3/ZnS‐CA membrane is significantly enhanced (about 30% improvement) and the photodegradation kinetic is four times faster than that of the Bi2O3‐CA and the ZnS‐CA membranes. Moreover, the Bi2O3/ZnS‐CA membrane exhibits excellent permeation flux (649.7 L m−2 h−1) and high porosity (69.94%). The Bi2O3/ZnS‐CA membrane also shows good adsorption performance of RhB, which could enhance the interaction between RhB and the catalyst. This work provides a new sight to construct highly effective visible‐light‐driven photocatalytic membranes for continuous organic dye treatment.