纳米TiO_2改性竹炭对空气中苯的吸附与降解

Adsorption and degradation of benzene in atmosphere by Nano-TiO_2 modified bamboo charcoal

采用纳米二氧化钛(TiO2)对竹炭进行改性,并结合FT-IR、EPR图谱及SEM对其性能和结构进行表征,通过气相色谱法研究了改性竹炭对空气中苯的净化效果。结果表明:TiO2既负载到竹炭孔隙的边沿和表面,又没有堵塞竹炭的特殊孔隙,且改性竹炭的自旋数由8.7×1013增加到8.9×1017。纳米改性竹炭可将空气中的苯污染物降解为无毒、无害的二氧化碳和水,且在紫外灯照射下的降解效果最好;当纳米TiO2质量分数为3%时,改性竹炭降解苯12 h的净化率可达93.50%。

Bamboo charcoal was modified by Nano- TiO2. The properties and structures of modified bamboo charcoal were investigated by FT-IR, EPR and SEM. According to the results, TiO2 could be loaded on the brim and surface of the pores in bamboo carbon without blocking them. The amount of non-conjugated electron in modified bamboo charcoal was raised from 8.7 × 10^13 to 8.9 × 10^17. Purification of benzene in atmosphere by modified bamboo charcoal was determined by GC. The results indicated that modified bamboo charcoal could degrade benzene into carbon dioxide and water. The best efficiency of degrading benzene was obtained under ultraviolet irradiation. When the content of TiO2 reached 3% , the purification rate was up to 93.50% using modified bamboo charcoal for 12 hours.