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Utilization of Smart Hydrogel–Metal Composites as Catalysis Media

Sahiner, Nurettin, Butun, Sultan, Ozay, Ozgur, Dibek, Burak
Journal of colloid and interface science 2012 v.373 no.1 pp. 122-128
absorption, aqueous solutions, catalytic activity, cobalt, copper, hydrocolloids, hydrogen, hydrogen production, hydrolysis, iron, metal ions, nanoparticles, nickel, nitroaromatic compounds, p-nitrophenol, reducing agents, sodium hydroxide
Various metal nanoparticles such as, Cu, Co, Ni, and Fe were prepared inside poly(1-vinyl imidazole) p(VI) hydrogel by the absorption of the corresponding metal ions from aqueous solutions and the reduction with suitable reducing agents such as NaBH₄ and/or NaOH. TGA and ICP–AES were used to determine the metal particle content of p(VI)–M (M: Cu, Co, and Ni) composites. The prepared hydrogel–metal nanoparticle composites were proven to be resourceful as reaction container for the catalysis of various organic reactions. It was illustrated that p(VI)–M hydrogel–metal composites can be successfully used in the hydrolysis of NaBH₄ for the generation hydrogen form NaBH₄ and NH₃BH₃. Additionally, p(VI)–M composites were also illustrated in the catalysis of different organic reactions; e.g., these hydrogel-M are very effective in the reduction nitro aromatic compounds such 2-nitrophenol (2-NP) and 4-nitrophenol (4-NP) to their corresponding amine forms in the presence of aqueous NaBH₄. Various parameters in the catalysis of hydrogen production and 4-NP reduction were determined.