掺氮TiO_2—活性炭复合材料室内空气净化器开发实验研究

Development experimental study of N -doped TiO_2 -activated carbon composite material indoor air purifiers

掺氮TiO_2-活性炭复合材料,对低浓度甲醛等挥发性有机化合物具有良好的吸附性能,具有优越的可见光再生性能,在实际应用时,可实现对低浓度VOCs的吸附和光催化分解解耦,提高了复合材料的循环利用性能。本文对影响掺氮TiO_2-活性炭复合材料室内空气净化器净化性能的活性炭颗粒形态、颗粒填充量、迎面风速,以及污染物初始浓度等因素进行了实验探讨。结果表明:成本低廉且易于获取的(8～16)目椰壳高效活性炭,比表面积较大,作为基底材料具有较好的净化性能;净化器净化能力与复合材料负载量正相关,但并不与其负载量成简单正比关系;在吸附时间与滤速相互制约下,净化器存在着最佳滤速;复合材料空气净化器不仪在甲醛初始浓度相对较高时有着良好的净化性能,在甲醛初始浓度较低情况下也有比较好的净化性能。

N -doped TiO2 -activated carbon composite materials, has a good adsorption performance for low concentrations of formaldehyde and other volatile organic compounds, with superior regenerative properties of visible light, and in practice, the realization the adsorption and decomposition of low concentrations of VOCs in different time, which improve performance of composite recycling. In this paper, effects of nitrogen -doped TiO2 -activated carbon composites indoor air cleaner performance, for instance, activated carbon panicle morphology, particle filled volume, face velocity, and initial concentration of pollutants are experimentally discussed. The results showed that： The 8 to 16 mesh coconut shell activated carbon, which is low cost and easy access, has the larger efficient surface area and good cleaning performance as the base material; Purification capacity and load are related to composite materials, but not proportional to its loading in a simple relationship; Filtration rate and the adsorption time in the constraints of each other, so there is the best purifier filtration rate ; Composite air purifier not only in the relatively high initial concentration of formaldehyde have a good purification performance, in the case of lower initial concentration, but also has good cleaning performance.