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为了降解室内空气中游离甲醛,通过Ti O2纳米管光催化剂和活性炭吸附层制作空气净化器,并在光催化剂表面外加电流提高光催化净化速度。利用扫描电子电镜(SEM)和X-射线衍射(XRD)观察光催化剂的表面形态与晶型。实验结果表明,空气净化器整体工作3 h后降解率为100%。光催化部分工作3.5 h后降解率为100%。活性炭吸附海绵工作4 h后降解率为84.3%。外场电流的加入,提高了光催化剂的工作效果,电流增大到0.1 A后,催化剂净化效果不再提升。光催化剂寿命测试实验中,Ti O2纳米管基板在使用960 h后,光催化活性降解效果仅降低6.2%。
In order to degrade the free formaldehyde in the indoor air, the air purifier is made by using the Ti02 nanotube photocatalyst and the activated carbon adsorption layer, and applying photocurrent on the photocatalyst surface to increase the photocatalytic purification speed. The morphology and crystal form of the photocatalyst were observed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The experimental results show that the overall air purifier 3 hours after the degradation rate was 100%. Photocatalytic part of the work after 3.5 h degradation rate of 100%. The degradation rate of activated carbon adsorption sponge after 4 h was 84.3%. The addition of field current improves the working efficiency of the photocatalyst. After the current is increased to 0.1 A, the catalyst purification effect no longer increases. In photocatalyst life test, the photocatalytic activity of Ti02 nanotube substrate degraded by only 6.2% after 960 h.