室内甲醛的真空紫外-光催化降解实验研究  

Experiment Research on Degradation of Indoor Formaldehyde by Vacuum Ultraviolet-Photocatalysis

作　　者：杨莉萍[1] 刘震炎[1] 施建伟[1] 上官文峰[1] 胡海[1] 

机构地区：[1]上海交通大学

出　　处：《化学反应工程与工艺》2006年第3期246-251,共6页Chemical Reaction Engineering and Technology

基　　金：上海市科技发展基金(0552nm002)

摘　　要：对真空紫外-光催化(VUV-TiO_2/UV)在较高流速(0.30～0.94 m/s)和不同相对湿度(30%～80%)条件下动态去除室内典型浓度的甲醛(<0.624 mg/m^3)进行了实验研究,并与真空紫外(VUV)和光催化(TiO_2/UV)的降解进行了比较。基于净化器串联效率模型,通过比较去除率的实验值和计算值考察了 VUV 和 TiO_2/UV 之间的复合或协同效应。结果表明,TiO_2/UV 和 VUV 能够形成优势互补,TiO_2/UV 对甲醛的一次性去除率相对较低,而 VUV 提高了 TiO_2/UV 对甲醛的去除率,低浓度时效果更加显著;同时 TiO_2/UV 能够高效去除 VUV 产生的臭氧,当反应器内空气流速大于0.6 m/s 时,VUV-TiO_2/UV 的臭氧出口浓度在国家标准值之下。VUV 和 TiO_2/UV 之间存在着微弱的复合效应。The degradation of indoor formaldehyde less than 0. 624 mg/m^3 by vacuum ultravioletphotocatalysis （VUV-TiO2/UV） was experimentally researched at relatively high flow velocity of 0.3-0.94 m/s and relative humidity of 30%--80% in a simulated central air-conditioning case and was compared with those by TiO2/UV and VUV. The synergistic or recombination effect between VUV and TiO2/UV was investigated by comparing experimental with calculated conversions based on the efficiency model of purifier-in-series. The results showed that an outstanding merit of VUV-TiO2/UV was the complementation of advantages of VUV and TiO2/UV. The conversion of formaldehyde by TiO2/ UV was low and was improved markedly by VUV, especially at relatively low concentrations. The excessive ozone produced by VUV was eliminated by TiO2/UV. When the air velocity in the reactor was higher than 0.6m/s, the outlet ozone concentration of VUV-TiO2/UV was under the limit of national standards. There was weak recombination effect between VUV and TiO2/UV.

关 键 词：真空紫外 二氧化钛 光催化 甲醛 臭氧 降解 

分 类 号：TQ034[化学工程]