不同改性方式对竹炭净化气态氮氧化物效果的影响

Effects of different modification methods on NO_x purification by bamboo charcoal

为了研究不同表面改性方法对竹炭空气净化效果的影响,测定了化学药剂活化、超声处理、微波处理后的改性竹炭对低浓度氮氧化物的净化效果。结果表明:活化剂浸渍后的竹炭,对氮氧化物净化效率降低,净化速度减慢;微波功率越大、辐照时间越长,改性后竹炭对氮氧化物处理效率越大,但辐照时间达到一定程度后,竹炭对氮氧化物的处理效率增大变得缓慢;超声处理后的竹炭对NO的处理效率比改性前有明显提高。BET测试结果表明,竹炭产品用微波和超声处理后,平均孔径、微孔表面积和比表面积均比活化前增大;而经过活化剂浸渍后,微孔面积和比表面积都显著下降。因此建议采用微波及超声方式对竹炭进行活化。

In order to study the effects of different surface modification methods on air purification of bamboo-based carbon,the removal rate of low-concentration nitrogen oxides was determined when bamboo charcoals were modified by activating agent,microwave and ultrasonic process,respectively.Results showed that the NOx purification efficiency reduced if bamboo charcoal was treated by activating agent;while the NOx purification efficiency increased greatly if bamboo charcoal was treated by microwave and ultrasonic.BET test results showed that average aperture,micropore area and specific surface area of bamboo charcoal modified by microwave and ultrasonic increased,but those of bamboo charcoal modified by activating agent decreased.Therefore,microwave and ultrasonic process are proposed for modification of bamboo charcoal.