Cu/Fe双金属负载PAN非织造布催化降解甲醛气体研究

Enhanced Catalytic Properties of PAN Nonwoven Supported Cu-Fe Bimetallic Complex for Formaldehyde Degradation

采用偕胺肟改性聚丙烯腈(PAN)非织造布作为载体材料,将其与Cu^(2+)和Fe^(3+)的混合溶液进行反应制备双金属负载PAN非织造布催化剂。采用XPS和UV-Vis对催化剂的分子结构进行了表征,然后考察了其在甲醛气体氧化降解反应中的催化作用。结果表明,Cu^(2+)和Fe^(3+)均是通过与偕胺肟基团中的羟基和氨基的配位作用负载于PAN非织造布上,而且两种金属离子可能通过配体发生了相互作用。此外,与Fe^(3+)的单金属催化剂相比,适量掺杂Cu^(2+)能够有效提高催化体系在甲醛降解反应中的催化活性,尤其有利于其在暗反应时催化降解甲醛气体,这主要归因于Cu^(2+)/Cu^+价态转化促进了强氧化性中间体Fe(Ⅳ)=O的生成。

A Cu-Fe bimetallic catalyst was prepared by immersing amidoximated PAN nonwovens into the mixed metal solution containing CuSO4 and FeCl3.The catalyst was characterized by X-ray photoelectron spectroscopy（XPS）and ultraviolet-visible spectroscopy（UV-vis）,and then employed in the oxidative degradation of formaldehyde.The results suggested that Cu^（2＋）and Fe^（3＋）was immobilized onto the catalyst through coordination bonds with O-H and-NH2 in amidoxime group,and there may exist interaction between the two kinds of metal ions through the ligands.In addition,doping Cu^（2＋）make the bimetallic catalyst exhibited better catalytic activity than the monometallic Fe^（3＋）catalyst in formaldehyde degradation,especially under visible light and dark state,this should be attributed to the valence state transformation between Cu^（2＋）and Cu~＋which accelerate the generation of high oxidizing Fe（Ⅳ）=O.