LAUSR

Abstract As an environment-conscious catalyst, a nanocomposite of Pt nanoparticles supported by dendrimer and cellulose nanofiber was designed. The poly(amido amine) dendrimer was immobilized, by the amidation reaction, on the 2,2,6,6-tetramethyl-1-piperdinyloxy free radical oxidized cellulose nanofiber (TOCNF), and its binding ratios at different mixing ratios were colorimetrically analyzed. The results showed that the dendrimer bound on TOCNF caused a saturation, while polyethyleneimines (PEIs) almost linearly increased the binding mass ratio per TOCNF as the mixing ratio rose. The dendrimer/TOCNF formed a viscoelastic gel in wide mixing ratios, while the PEIs/TOCNF varied their gel characters depending on molecular weight of PEI and mixing ratio. The Pt nanoparticle-incorporated dendrimer (DENPtNPs) was chemically bound on TOCNF. The TOCNF/DENPtNPs gels were dried to form solid films, and then applied for the decomposition of formaldehyde in gas phase. It was demonstrated that the dendrimer effectively captured formaldehyde and the PtNPs decomposed it. These results would be useful to develop catalytic nanocomposite membranes.