Study on TiO₂ UV photocatalytic degradation of aflatoxin B₁ in peanut oil and its kinetics by titanium dioxide nano-photocatalyst

In order to investigate the photocatalytic degradation of aflatoxin B₁ (AFB₁) in peanut oil and its kinetics, the prepared TiO₂ was used to degrade the AFB₁ in homemade reactor. The effects of calcination temperature, light intensity and cycle speed on the degradation efficiency and peanut oil quality were investigated. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) were used to analyze the characterization of the prepared semiconductor materials. Results showed that:With the increase of calcination temperature, the diffraction peak of anatase crystal became more and more sharp, the crystal size was getting bigger and bigger and the anatase mass fraction decreased gradually. At 400℃, the contents of hydroxyl oxygen and acid value were both at high level. The photocatalytic degradation of AFB₁ in peanut oil was in accordance with the pseudo first-order kinetic model well, the optimum calcination temperature was 400℃, light intensity 26 μmol·m^-2s^-1, circulation speed 800 mL·min^-1, peroxide value and acid price after degradation was still in line with national standards.