光触媒/活性炭-电纺纳米纤维复合膜的制备及其甲醛去除性能的考察

Photocatalyst/activated carbon-preparation of electrospun nanofiber composite membrane and investigation of its formaldehyde removal performance

目的为克服现有的室内甲醛污染治理材料存在的不足,将光触媒光催化分解和活性炭物理吸附除甲醛机理相结合,发展可长期、重复使用,并且无需完全依赖光照的甲醛去除材料。方法选取聚氯乙烯PVC+聚苯乙烯PS为基质,以DMF+THF(3+1)为溶剂制备电纺纳米纤维膜(NF),采用电喷雾的技术逐层在纤维表面沉积光触媒(P)和活性炭(C),得到三元复合材料,进一步通过交替电纺和功能化,得到NF-P/C复合多层膜。对制备的复合膜NF-P/C膜与NF-P膜及NF-C膜在有无光照条件下甲醛去除性能进行考察,并与几种市售甲醛去除剂进行甲醛去除性能上的对比。结果在500 W氙灯照射下12 h内光催化甲醛去除效率比纯Ti O2光触媒的更为优异,而在无光照的条件下仍能保持良好的甲醛去除效率。结论 NF-P/C三元复合膜在有无光照的条件下均能表现出优秀的甲醛去除性能。

Objective To overcome the shortages of the existing formaldehyde treatments, we have developed a simple and convenient method for the preparation of photocatalyst / activated carbon - electrospun nanofiber （NF - P/ C） composite membranes,and explored its application in indoor formaldehyde pollution control. Methods Polyvinyl chloride / polystyrene （ PVC/ PS ）nanofibers （NFs） was first prepared using the electrospinning technique. Photocatalyst （ P） and activated carbon （ C） were then deposited onto the NFs by electrospray to obtain the P/ C - NF ternary single layer membrane. Finally, by alternately electrospinning and deposition, the NF - P/ C ternary composite membrane was prepared through a layer-by-layer manner. The work optimized the preparation conditions of the NF - P/ C ternary composite membrane in detail, and characterized the morphology and formal dehyderemoval performance of the membrane. Results With higher removal efficiency than traditional photocatalyst or activated carbon under 12 h irradiation with a 500 W xenon lamp, and remained acceptable removal efficiency in the absence of irradiation light. Conclusion The NF - P/ C ternary composite membrane exhibited excellent formaldehyde removal performance.