Preparation and preservation performance of Ag/TiO2/Ag3PO4-LNCF/starch composite film
In order to improve the microbial infestation and ethylene catalysis in the preservation of fruits and vegetables,Ag/TiO2/Ag3PO4(ATAP) ternary heterojunction photocatalysts were synthesized by in-situ precipitation and irradiation,and ATAP-lignin nanofibrillar cellulose(LCNF)/starch composite films were prepared by using casting method in this study.The effects of different ATAP loading conditions and different types of photocatalysts on ethylene adsorption,ethylene degradation,and bacterial inhibition were investigated.The microscopic morphology of the composite films was observed by SEM,and preservation effect of different photocatalysis film was evaluated.The results show that the appropriate amount of ATAP internal and external doping can make the photocatalyst uniformly dispersed on the surface of the starch film and thus enhances its photocatalytic performance.The ATAP-LCNF/starch composite film possesses the optimal ethylene degradation and bacterial inhibition when the ATAP external doping amount is 3％ and the internal doping amount is 2％ with the degradation rate of 7.73％,and the diameter of the inhibition circle of 11.46 mm.ATAP-LNCF/starch composite film has better freshness preservation for pumpkin.The mould coverage area on the surface of and inside pumpkin after 7 d of freshness preservation is significantly reduced,and the weight loss rate is reduced to 28.27％.Meanwhile,the composite films show significant inhibitory effects on S.aureus and moulds with colony counts.The total number of colonies,the number of Staphylococcus aureus colonies and the number of mould colonies are 5.55×104,4.95×104 and 3.00×104 CFU/g,respectively,better than those of other materials and the control group.The study provides theoretical reference for the development of new materials for fruits and vegetables preservation.
ternary heterojunctionphotocatalysisstarch composite filmfruit and vegetable preservation
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