Ni /Fe۳O۴@Nanocellulose and Ni/Nanocellulose Green Nanocomposites: Inorganic- Organic Hybrid Catalysts for the Reduction of Organic Pollutants

In this work, Ni NPs have been in-situ synthesized using hydrazine as a reducing agent and immobilized on nanofibrillated cellulose (Ni/NFC) and magnetic nanofibrillated cellulose (Ni/Fe۳O۴@NFC) as green supports. The structure and morphology of the Ni/Fe۳O۴@NFC nanocomposite clarified high purity single-phase spherical-shaped Ni nanoparticles of about ۳۰ nm distributed on the surface of nanocellulose as compared to the larger size of star shape particles in Ni/NFC. The catalytic activity of both nanocomposites was investigated for the reduction of ۴-nitrophenol (۴-NP), Methyl Orange (MO), and Methylene Blue (MB). The results demonstrated high catalytic efficiency toward the removal of water pollutants in a short reaction time. The reduction rate constants (k) of freeze-dried Ni/Fe۳O۴@NFC catalyst were ۳۰ ×۱۰-۳ s-۱, ۱۷.۳×۱۰-۳ s-۱, and ۶.۹ ×۱۰-۳ s-۱, for ۴-NP, MO, and MB respectively, which were higher than those of synthesized Ni/NFC and other reported Ni-based catalysts. Moreover, the catalyst could be easily magnetically recoverable and reusable in other cycles.

کلیدواژه ها:

Ni nanoparticle ، Fe۳O۴ ، Catalytic activity ، Nanocellulose