LED-driven sulfamethazine removal and bacterial disinfection by a novel photocatalytic textile impregnated with oxygen vacancy-rich BiO2-x/g-C3N4 hybrid
Oxygen vacancies (OVs) and heterostructures of photocatalysts play crucial roles in photocatalysis driven by visible light. In this study, a novel photocatalytic textile was prepared by spraying heterostructures of OVs-rich bismuth oxide (BiO 2-x ) and urea-derived graphitic carbon nitride (UCN) on amine group-modified poly(acrylonitrile) nonwoven textile (APAN), and then studied for sulfamethazine (SMT) removal and bacterial ( S. aureus ) disinfection under irradiation of energy-efficient white light emitting diodes (LEDs). The optimal BiO 2-x , prepared within a much shorter time (i.e. 1 h), was actually a ternary mixture of NaBiO 3 -Bi 2 O 3 -BiO 2-x with rich OVs rather than pure BiO 2-x . Incorporation of UCN could help redistribute electrons and induce formation of more OVs, thereby improve the photocatalytic activity of the BU-0.2 hybrid (i.e. mass ratio of BiO 2-x /UCN = 1:0.2). The BU-0.2 could use full-spectrum white light (i.e. 380–760 nm) to achieve superior SMT removal in a wide pH range (pH 5.0–9.0) and in the co-presence of common water constituents. The enhanced photocatalytic performance of BU-0.2 was attributed to the formation of OVs and heterostructure, which could broaden light absorption, help charges separation, and favor adsorption and activation of molecular O 2 . Detection of reactive species demonstrated that 1 O 2 and holes were the dominant factors responsible for SMT removal. Spraying deposition of BU-0.2 on APAN could endow the resultant textile (i.e. APAN-BU-0.2) with excellent photocatalytic activity for SMT removal and bacterial disinfection under LED white light irradiation. The as-prepared photocatalysts showed promising application prospects in purification of emerging pollutants utilizing LED white light.
危险品化学品经营许可证（带存储）