Nano bismuth tungstate photocatalyst for visible-light disinfection

Overview

This solution is a nano-structured bismuth tungstate (BWO) photocatalyst developed for visible-light-driven disinfection of both soft and hard surfaces. Compared with conventional particle-like BWO, the nano-structured form provides a larger specific surface area and enhanced charge-carrier separation, which together increase microbial adsorption and accelerate oxidation-based inactivation. Because the disinfection reaction is driven by light-activated charge carriers reacting with microorganisms, the technology avoids the secondary contamination often associated with chemical disinfectants. The end product is envisioned as a task-specific BWO that can be applied as a coating, offering a sustainable, light-powered alternative for sanitation in healthcare, food processing, public spaces, and water-treatment environments.

Technical specifications

• Material: Bismuth tungstate (Bi2WO6) synthesized in nano-structured morphologies rather than bulk or particle form.
• Activation wavelength: Operates under visible-light irradiation (λ ≥ 470 nm), enabling use of natural sunlight or standard indoor lighting.
• Mechanism of action: Photo-generated charge carriers react directly with adsorbed microorganisms, driving oxidation-based inactivation before charge recombination can occur.
• Performance benchmark: Prior literature reports nano-caged BWO achieving roughly 10 times the photocatalytic activity of titanium dioxide in degrading model organic compounds under visible light.
• Design parameters under investigation: Morphology variation, band-gap engineering, potential heterojunction structures, and optimum solar irradiation yield to maximize disinfection efficiency.
• Application format: Development of a coating method to deposit task-specific BWO onto target surfaces.
• Evaluation scope: Photocatalytic disinfection testing across multiple surface types and model microorganisms, including longevity and durability assessments.

Technology readiness level

The project is at an early-to-mid stage of development. The underlying hypothesis is supported by published findings demonstrating BWO's ability to inactivate E. coli and the superior photocatalytic performance of nano-structured BWO, but it has not yet been directly validated for the proposed disinfection application. Planned work includes screening and identifying the optimal nano-BWO morphology, synthesizing and coating prototypes, performing controlled disinfection experiments with model microorganisms on varied surfaces, evaluating coating longevity, and assessing scalability from laboratory to full-scale deployment.