二氧化钛-活性炭纤维混合材料净化室内甲醛污染

Removing Formaldehyde from Indoor Gas by TiO_2-Active Carbon Fiber Compound Materials

将常温吸附和光催化降解两种作用相结合,寻求一种简单有效的治理室内空气中低浓度甲醛污染的方法。分别选用活性炭纤维(ACF)和二氧化钛(TiO2)作为吸附剂和光催化剂,取室内甲醛的浓度0.3mg/m3作为初始浓度,测定出在25℃时ACF、TiO2和(ACF+TiO2)混合材料(ACF/TiO2的质量比为1∶0.5)3种净化剂的动态等温净化量随时间的变化规律。结果表明:在太阳光照下,TiO2和(ACF+TiO2)混合材料均有相应的饱和净化量,而用紫外灯照射之后,两者的净化量都有明显增加。ACF、TiO2和(ACF+TiO2)混合材料3种净化剂的饱和净化量由大到小的排列为:(ACF+TiO2)混合材料>ACF>TiO2且有(ACF+TiO2)混合材料>ACF+TiO2;TiO2在太阳光照下具有降解活性,紫外光照可明显增强其活性。新(ACF+TiO2)混合材料比ACF或TiO2单独作用的效果更好。ACF与TiO2的质量比为1∶0.5时去除效果最好。

In order to find a simple and effective method to remove formaldehyde from indoor air by the way of combining two functions of adsorption and photocatalytic degradation. Active Carbon Fiber (ACF) was adopted as an adsorbent and titanium dioxide (TiO_2) as a photocatalyst. Using 0.3?mg/m^3 initial concentration of formaldehyde, the variation law of the dynamic, isothermal remomvals of ACF, TiO_2 and (TiO_2 +ACF) compound ( the mass ratio of ACF to TiO_2 is 1 to 0.5) with the time changing was investigated respectively and compared.The results showed that in solar radiation, both TiO_2 and (ACF+TiO_2) have their saturated removals, and in UV radiation the removals of these two depuratives are drastically increased. There are two types of relationships among the saturated removals of ACF, TiO_2 and (TiO_2 +ACF) compound :(ACF+TiO_2)>ACF> TiO_2 and(ACF+TiO_2)>ACF +TiO_2. In solar radiation TiO_2 has adequate photocatalytic activity to degrade formaldehyde; however, its photocatalytic activity can be notably enhanced in UV radiation. Compared with ACF or TiO_2 ,(TiO_2 +ACF) compound is a much more effective material in terms of removing formaldehyde, and the mass ratio of ACF to TiO_2 with the best effectiveness is 1∶0.5.