Large Scale Preparation of Palladium Nanoparticles Loaded Polyaniline Nanostructures through Seed Induced Bulk Polymerization

Abstract

We report the large scale preparation of nanostructured polyaniline‐Pd nanoparticles composites (designated as PANI(NS)‐PdNPs) through a “seed” induced bulk polymerization. Initially, a small quantity of PANI(NS)‐PdNPs was formed inside the cavities of MCM‐41 and used as the “seed” for the bulk preparation of PANI(NS)‐PdNPs composite. For a comparative purpose a PANI‐PdNPs composite was also prepared in the absence of the seed. FESEM image of PANI(NS)‐PdNPs composite (bulk) shows nanofibrillar morphology. Further, transmission electron microscopy reveals the presence of spherical Pd nanoparticles. PANI(NS)‐PdNPs composite (bulk) showed a good catalytic activity towards reduction of 4‐nitrophenol.magnified image

Dual-Functional Grafted Electrospun Polymer Microfiber Scaffold Hosted Palladium Nanoparticles for Catalyzing Redox Reactions

“…The catalytic reduction of p ‐nitrophenol (PNP) to p ‐aminophenol (PAP) with borohydride at room temperature had been used extensively as a model redox system to evaluate the catalytic activity of the coinage metal nanocatalysts, including the Pd NPs . Therefore, the catalytic performance of the Fiber@Pd in this redox system was also studied.…”

SDBS-assisted preparation of novel polyaniline planar-structure: Morphology, mechanism and hydrophobicity

“…In recent years, more and more studies have been endeavored to explore micro/nanostructures of PANI because of their unusual properties and potential applications [4][5][6]. Up to the present, various approaches, such as surfactant-assisted synthesis [7], electrochemical method [8], interfacial polymerization [9], ''seed'' polymerization [10], soft template [11] and template-free method [12], have been used for the fabrication of PANI with different micro/nanostructures. A variety of PANI micro/nanostructures from zero to three-dimension (nanoparticles [13], nanorods [14], nanowires [15], nanotubes [12], micro-box [16] and microspheres [17]) have been successfully prepared by the means mentioned above.…”

Reduction of 4‐Nitrophenol as a Model Reaction for Nanocatalysis

“…Silica support materials were successfully applied for the largescale preparation of Pd NPs with MCM-41 ordered mesoporous silica (Figure 13.30a) [109], and Pd NPs in a microcapsules structure [110] ( Figure 13.30b). Both showed good catalytic activity with complete reduction and recyclability.…”

“…Furthermore, their large-scale application is hindered by a reduction in catalytic activity due to particle aggregation. To overcome these disadvantages, metal nanocomposite catalysts have been immobilized onto solid supports such as inorganic oxide [89,90,93,100,106,109,110], ion exchange resins [70,71,87], alumina [88,108], titania [11], polymer microspheres [78,91,[97][98][99], polystyrene [5,72,76,77,79,92,96,104,105], nanotubes [103], carbon spheres [101,102], and biomolecule beads [58]. Th ese supports must not take part in the catalytic mechanism, i.e., they must be inert.…”