Immobilization and Recovery of Au Nanoparticles from Anion Exchange Resin:  Resin-Bound Nanoparticle Matrix as a Catalyst for the Reduction of 4-Nitrophenol

Abstract

The immobilization of gold nanoparticles in anion exchange resin and their quantitative retrieval by means of a cationic surfactant, cetylpyridinium chloride, is studied. The resin-bound gold nanoparticles (R-Au) have been used successfully as a solid-phase catalyst for the reduction of 4-nitrophenol by sodium borohydride. At the end of the reaction, the solid matrix remains activated and separated from the product. The recycling of catalyst particles after the quantitative reduction of 4-nitrophenol and the recovery of gold nanoparticles with unaffected particle morphology from the resin-bound gold nanoparticle entity have been reported.

Synthesis of Plant-Mediated Gold Nanoparticles and Catalytic Role of Biomatrix-Embedded Nanomaterials

“…In that case, only the decrease in the absorbance of 4-NP peak was observed as a consequence of the adsorption of nitrophenolate ions by the solid mass. The generation of 4-AP ( Figure 5B) confirms the catalytic activity of the gold nanoparticles for the reduction of 4-NP in aqueous solution (17). This observation authenticates the presence and surface activity of gold nanoparticles in the biomatrix.…”

“…Following sonication, the decolorization was quantitatively monitored using a spectrophotometer (17).…”

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“…4a, pure 4-NP shows a distinct spectral profile with an absorption maximum at 316 nm. When a NaBH 4 solution was added into the 4-NP, a new absorption peak was observed at 400 nm, corresponding to the 4-NP ions in alkaline conditions [46]. The absorption intensity of 4-NP ions at 400 nm decreased quickly with time, accompanied with the appearance of the peak of 4-AP at 300 nm, indicating successful conversion of 4-NP to 4-AP.…”

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“…The decrease in the intensity of this peak is directly connected with the transformation of 4-aminophenol compound which absorbs below 300 nm and therefore is colourless. Furthermore, this reaction does not take place in the absence of catalyst [23,[32][33][34][35].…”