Cellulose aerogel has attracted considerable attention due to its high surface area and the added advantages of being cost-effective and environmentally benign. It has been applied as supporting material for noble metal nanoparticle catalysts to prevent their agglomeration. In this paper, we have demonstrated a facile method to prepare polyaniline (PANI)-decorated cellulose aerogel via a dissolve/ regeneration route using ionic liquid as solvent. Cellulose aerogel acted as a supporting material for PANI nanoparticles to prevent their agglomeration as confirmed by scanning electron microscopy. The strong interfacial interaction between PANI and cellulose aerogel was verified by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermal gravimetric analysis and X-ray diffraction. PANIcellulose aerogel exhibited excellent photocatalytic activity towards the degradation of methylene blue.The degradation efficiency reached 95% after 2 h. The approach promotes the use of renewable natural resources to prepare a variety of nanofibrillated cellulose-supported nanocomposites for catalysis, sensors, and other potential applications.
In this study, a facile synthetic method has been developed for in situ growth of Au nanoparticles (NPs) on magnetic g-Fe 2 O 3 @carboxylated cellulose nanospheres using 2,2,6,6-tetramethylpiperidinyl-1-oxyl radical (TEMPO) oxide cellulose as linkage and reducing agent. The size of the as-prepared Au NPs can be tuned from 14 to 38 nm by the initial concentration of the gold salt used in the reaction mixture. Only one step was needed to synthesize the magnetic g-Fe 2 O 3 @cellulose nanospheres. The formed g-Fe 2 O 3 @carboxylated cellulose@Au is highly dispersible in aqueous solution and its potential as a magnetic catalyst is proved by the reduction reaction of 4-nitrophenol to 4-aminophenol. In particular, there was no visible decrease in the catalytic activity of the reused catalysts even after being recycled five times, which is preferred in terms of cost and environmental protection. Due to the absence of any other reducing agent during the proposed process, both the synthesis steps and the reaction cost were remarkably decreased, which makes it very suitable for industrial-scale production of recyclable catalysts.
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