纳米二氧化钛闪照强光光催化杀菌与保鲜技术初探

Preliminary study on technology of disinfection and preservation by photocalysis using nanometer TiO_2 and flashlight

利用纳米二氧化钛光催化活性高的特性 ,对纳米二氧化钛闪照强光光催化杀菌与保鲜技术进行了初步研究 ;采用L1 6 (4 5)正交试验探讨了纳米二氧化钛浓度、强光的闪照次数、闪照距离和菌液浓度等因素对枯草芽孢杆菌、大肠杆菌杀灭效果的影响 ;并对龙眼进行保鲜试验。结果表明 ,纳米二氧化钛在闪照强光作用下对枯草芽孢杆菌、大肠杆菌具有杀灭作用 ,也能延长龙眼保质期。当 Ti O2 浓度为 4 .0× 10 - 4g/ m L ,闪照次数 30次时 ,杀菌效果最好 ;当保鲜薄膜含纳米二氧化钛1.3× 10 - 4～ 1.5× 10 - 4g/ cm2 ,闪照距离为 8cm,闪照次数为 10次 ,龙眼保鲜效果最好。

On the basis of the higher photocalysis characteristics of nanometer TiO 2, the technology of disinfecting and keeping fruit fresh by photocalysis using nanometer TiO 2 and flashlight was probed. The effect of the dosage of nanometer TiO 2, the times of flashlight, the distance between flashlight source and the target object and the original concentration of bacteria on disinfecting the bacteria(Bacillus Subtilis, Escherichiacoli) was studied by means of L 16 (4 5) orthogonal experiments. The experiment of keeping longan fresh by the photocalysis was also done. The results show that the photocalysis using nanometer TiO 2 and flashlight is effective for disinfecting the bacteria and extending longan shelf life. The optimal result was obtained: a)for disinfecting the bacteria, the dosage of TiO 2 is 4.0×10 -4 g/mL and the flashlight times is 30; b)for extending longan shelf life, the times of flashlight is 10,the distance between flashlight and the target object is 8 cm, the added amount of TiO 2 to plastic film is 1.3×10 -4 ~1.5×10 -4 g/cm 2.