依据光催化净化原理,设计一种管状光催化空气净化器,以甲醛为实验污染物,与以往的平板式反应器进行对比实验,结果表明:管状光催化反应器较传统的平板式反应器净化效果更好,降解效率提高14%。进行正交实验,得出对净化效率影响显著的因素排序为:环境温度> 甲醛初始浓度> 催化剂负载量;最佳催化条件:环境温度25℃,P25TiO₂负载量1.0 mg/cm²,甲醛初始浓度0.7 mg/m³;在最佳催化条件下实验,甲醛的降解效率在2 h内可达到89%,效果较好。

A tubular photocatalytic air purifier was designed on the basis of photocatalytic purification theory. With formaldehyde as experimental pollutant, its purification effect was compared with that of the traditional plate type reactor. The results show that the purification effect of the tubular reactor is better than that of the plate type reactor, and the degradation efficiency increases by 14%. Orthogonal tests show the significance level of the factors affecting purification efficiency is environmental temperature > initial concentration of formaldehyde >P25 TiO₂ load. The best catalytic conditions of the tubular photocatalytic air purifier are environmental temperature 25℃, P25TiO₂ capacity 1 mg/cm² and initial concentration of formaldehyde 0.7 mg/m³. Under the best catalytic conditions, the degradation rate of formaldehyde can achieve 89% within 120 min.

国家自然科学基金资助项目(51478058)。