纳米TiO2光催化条件对乙烯降解性能的影响  

Effect of Photocatalytic Conditions on the Degradation Property of Ethylene by Nano-TiO2

作　　者：劳彩娴 卢立新 潘嘹 卢莉璟 张大海 LAO Cai-xian;LU Li-xin;PAN Liao;LU Li-jing;ZHANG Da-hai(School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Wuxi 214122, China;Lihua Agricultural Development Co., Ltd., Suqian 223833, China)

机构地区：[1]江南大学机械工程学院,无锡214122 [2]江苏省食品先进制造装备技术重点实验室,无锡214122 [3]宿迁利华农业发展有限公司,宿迁223833

出　　处：《包装工程》2019年第13期104-109,共6页Packaging Engineering

基　　金：国家科技支撑计划(2015BAD16B06);江苏省苏北科技专项资金项目(BN2015164)

摘　　要：目的研究光源、乙烯初始浓度等反应条件对纳米TiO2光催化降解乙烯气体的影响,为纳米TiO2脱除乙烯的实际应用提供参考。方法向密闭反应器中加入纳米TiO2和乙烯气体,在室温下稳定后,设置光源和光照强度,对反应器进行照射,利用气相色谱法检测乙烯的浓度,计算乙烯的降解率;研究紫外光波长、光强度、乙烯初始浓度、纳米TiO2添加量对乙烯降解效率的影响。结果在254 nm的紫外光照射下,乙烯的降解率最大,反应2 h后,降解率高达95.92%;光源距离越短,光强度越高,当光强度大于28.00 W/cm^2时,乙烯降解率随光强度的增加急剧上升;乙烯的降解率随着乙烯初始浓度的增大而降低;TiO2添加量在0.05~0.5 g内时,乙烯的降解率随着纳米TiO2添加量的增加而增大,并随着时间的延长逐渐趋于稳定。结论紫外光波长越短,光强度越高;乙烯初始浓度越低,纳米TiO2的添加量越多,乙烯的降解率越大。The work aims to study the effects of reaction conditions such as light source and initial ethylene concentration on the photocatalytic degradation of ethylene gas by nano-TiO2,to provide reference for the practical application regarding removal of ethylene by nano-TiO2.Firstly,the Nano-TiO2 and ethylene gas were added into the closed reactor.Then,after stabilized at room temperature,the reactor was irradiated at different light intensities with different ultraviolet lights.The ethylene concentration was detected by gas chromatography to calculate the degradation rate of ethylene.In this way,the effects of the ultraviolet light’s wavelength,light intensity,initial ethylene concentration and addition amount of Nano-TiO2 on the degradation efficiency of ethylene were studied.The degradation rate of ethylene was the highest with the irradiation of 254 nm ultraviolet light,which reached up to 95.92%after 2 h.The shorter the light distance,the higher the light intensity.When the light intensity was more than 28.00 W/cm^2,the ethylene degradation rate increased sharply with the increase of light intensity.The degradation rate of ethylene decreased with the increase of initial concentration of ethylene.When the addition amount of TiO2 was 0.05~0.5 g,the degradation rate of ethylene increased with the addition of Nano-TiO2,and gradually stabilized with the extension of time.The shorter the wavelength of ultraviolet light is,the higher the light intensity is.The lower the initial concentration of ethylene is,the more the Nano-TiO2 added is,the greater the degradation rate of ethylene is.

关 键 词：果蔬保鲜 纳米二氧化钛 光催化 乙烯 气相色谱法 

分 类 号：O643.36[理学—物理化学]