Green Synthesis and Characterization of MIL -۱۰۱-Cu@Fe۳O۴ and MIL -۱۰۱-Ni@Fe۳O۴ from waste polyethylene terephthalate (PET) bottles and their Catalytic Activity in the Reduction of ۴ -Nitrophenol

Water pollution by nitro compounds like ۴ -nitrophenol (۴ -NP) is a global environmental concern. To effectively remove and reduce the toxic compounds of nitrophenol from polluted water and industrial effluents, various methods have been extensively studied. These methods include adsorption, oxidation, catalytic processes, and electrochemical techniques. But these methods have drawbacks, including low sensitivity, high cost, and longtime requirements. In recent years, scientists have been conducting catalytic hydrogenation of nitrophenols to convert them into aminophenols. In this work, we show that preparation of MIL-۱۰۱-Cu@Fe۳O۴ and MIL -۱۰۱-Ni@Fe۳O۴, with high sensitivity and stability for reduction of ۴-nitrophenol by sodium borohydride in water. The synthesis of MIL -۱۰۱(Cr) nanoparticles from waste polyethylene terephthalate (PET) via traditional hydrothermal methods represents a sustainable approach to repurposing plastic waste into valuable metal–organic frameworks (MOFs). These MOFs can be further functionalized by immobilizing transition metals such as copper (Cu) or nickel (Ni), and integrating with Fe۳O۴ nanoparticles to form composites like MIL-۱۰۱-Cu@Fe۳O۴ and MIL -۱۰۱-Ni@Fe۳O۴, which serve as efficient catalytic supports. The in-house fabricated MIL-۱۰۱-Cu@Fe۳O۴ and MIL -۱۰۱-Ni@Fe۳O۴ composites exhibit a porous structure and large specific surface area, contributing to their high performance in the catalytic reduction of ۴ -nitrophenol. The in-house fabricated MIL-۱۰۱-Cu@Fe۳O۴ and MIL -۱۰۱-Ni@Fe۳O۴ composites not only serve as stabilizers for metal nanoparticles but also exhibit high catalytic efficiency in the reduction of ۴ -nitrophenol to ۴-aminophenol in the presence of NaBH۴. This catalytic activity is effectively monitored using UV–vis absorption spectroscopy. The optimal time and Amount of catalyst was determined to check the reduction of ۴-nitrophenol.

کلیدواژه ها:

Reduction of ۴ -Nitrophenol ، Water pollution ، metal–organic frameworks ، metal nanoparticles