低温等离子体增强UV-LED对乙酸丙酯降解的效果与机理  

Effects and mechanism of the degradation of propyl acetate by non-thermalplasma-enhanced UV-LED

作　　者：王宇晨 李济吾[1] 唐秀娟[1] WANG Yuchen;LI Jiwu;TANG Xiujuan(College of Environmental Science and Engineering,Zhejiang Gongshang University,Hangzhou 310018)

机构地区：[1]浙江工商大学环境科学与工程学院,杭州310018

出　　处：《环境科学学报》2025年第2期453-461,共9页Acta Scientiae Circumstantiae

基　　金：浙江省基础公益研究计划项目(No.LGF22E080001)。

摘　　要：采用低温等离子体(NTP)增强紫外发光二极管(UV-LED)有望提高挥发性有机污染物的降解率.实验研究了NTP增强UV-LED降解乙酸丙酯的影响因素,并通过GC-MS探讨了NTP增强UV-LED降解乙酸丙酯的产物.结果表明,NTP+UV-LED降解乙酸丙酯的降解率与UV-LED波长、乙酸丙酯初始浓度、气体流量呈负相关,与电源施加的外加电压呈正相关.在气体流量为100 mL·min^(-1),UV-LED波长为254 nm,外加电压为18 kV,乙酸丙酯浓度为50 mg·m^(-3)时,NTP+UV-LED的最佳降解率达到71.76%.与254 nm UV-LED相比,NTP+UV-LED对CO_(2)的选择性提高了83.53%,能量效率提高了0.258 g·kW^(-1)·h^(-1),O_(3)浓度降低了1.96 mg·m^(-3).此外,NO、NO_(2)浓度分别降低了2.7 mg·m^(-3)和1.4 mg·m^(-3).GC-MS分析结果表明,NTP的加入能提高乙酸丙酯的降解率,但对有机副产物的种类影响不明显.Non-thermal plasma(NTP)enhanced UV-light-emitting diode(UV-LED)is utilized to improve the degradation rate of volatile organic compounds(VOCs).This study investigates the effects of various factors on the degradation of propyl acetate using NTP-enhanced UV-LED and explores the products of NTP-enhanced UV-LED degradation of propyl acetate through GC-MS analysis.The results indicated that the degradation rate of propyl acetate by the NTP+UV-LED was negatively correlated with the UV-LED wavelength,the initial concentration of propyl acetate,and the gas flow rate,while it was positively correlated with the applied voltage of the power supply.Optimal degradation conditions were achieved with a gas flow rate of 100 mL·min^(-1),a UV-LED wavelength of 254 nm,an applied voltage of 18 kV,and a propyl acetate concentration of 50 mg·m^(-3),resulting in a degradation rate of 71.76%.Compared to the UV-LED at 254 nm alone,the NTP+UV-LED increased CO_(2)selectivity by 83.53%,enhanced energy efficiency by 0.258 g·kW^(-1)·h^(-1),and reduced O_(3)concentration by 1.96 mg·m^(-3).Additionally,the concentrations of NO and NO_(2)decreased by 2.7 mg·m^(-3)and 1.4 mg·m^(-3),respectively.The results of GC-MS analysis revealed that the addition of NTP improved the degradation rate of propyl acetate,but had little effect on the types of organic by-products.

关 键 词：空气治理 低温等离子体 紫外发光二极管 挥发性有机化合物 

分 类 号：X701[环境科学与工程—环境工程]