Pd/TiO2/棉花纤维复合催化材料的制备与性能研究

Fabrication of Pd/TiO2/Cotton Fiber Composite Catalytic materials and study of its catalytic performance

摘要:

本文先通过浸渍-提拉法将纳米TiO₂对棉花纤维表面进行修饰,再通过浸渍-NaBH₄还原法将Pd纳米颗粒沉积在TiO₂/棉花纤维(TC)表面,制备得到Pd/TiO₂/棉花纤维复合催化材料(PTC)。所制备的复合催化材料用于室温氧化分解甲醛,研究了Pd负载量对催化性能的影响。结果表明,PTC催化材料具有远低于粉末状样品的气阻,此特点对催化材料的实际应用具有非常大的优势；该催化材料能有效室温分解甲醛成CO₂和H₂O。PTC催化材料的催化活性随Pd含量(0.25-1.0 wt%范围内)的增加而增加。鉴于PTC催化材料具有低气阻、轻质、使用灵活的属性和良好催化效率,以及载体棉花原料来源广泛、成本低等优点,因此它具有良好的实际应用于室内空气净化和相关催化过程的潜力。

Abstract:

Cotton fibers were firstly treated by nano TiO₂ coating via a dip-coating method, and then Pd nanoparticles (NPs) were deposited onto the surface of TiO₂/cotton fiber (TC) to acquire the Pd/TiO₂/cotton fiber composite (PTC) catalyst by a combined impregnation and NaBH₄-reduction method. The obtained PTC sample was used for room-temperature catalytic oxidation of formaldehyde (HCHO) and the influence of Pd content on catalytic activity was investigated. The results reveal that the air resistance of PTC catalyst is much lower than that of the powder-like sample, which is of vital importance for its actual application, and HCHO can be catalytically decomposed into CO₂ and H₂O over PTC. The catalytic activity of PTC increases with increasing of Pd content in the range of 0.25-1.0 wt%. Owing to the merits of low air resistance, light mass, flexible properties, good efficiency of the PTC catalyst, it can be a good candidate in actual indoor air purification and related catalytic processes.