Design and construction of stainless-steel-mesh-reinforced polyimide/silver phosphotungstate/PVDF photocatalytic films for degradation of aflatoxin B1 in peanut oil

Abstract

Photocatalytic technology can efficiently degrade aflatoxin B1 (AFB1) under ambient conditions while preserving peanut oil quality. Stainless-steel-mesh-reinforced photocatalytic functional films were successfully constructed using a bonding method. MPDF film, prepared using polyvinylidene fluoride (PVDF) as the binding agent, overcomes the problem that active sites are easily covered by the binding agents and exhibits excellent photocatalytic performance. Reduced agglomeration of active components and increased specific surface area enhance the photoelectric performance of MPDF and the reactive oxygen species generation. AFB1 decomposition begins with a ¹O₂-induced cycloaddition at the CC bond in the difuran ring. Under optimized conditions, the rate constant of AFB1 degradation was 35.9778 h⁻¹. After MPDF was used continuously for 24 h, the AFB1 degradation rate remained at 92.69 %, and the key quality parameters of peanut oil still met required standards. This work provides a novel perspective on the practical application of photocatalytic technology within the edible oil industry.