تثبیت نانوذره‌های پالادیم بر سطح نقاط کوانتومی مغناطیسی بر پایه کربن کیتوسان و کارایی کاتالیستی آن‌ در کاهش نیتروآرن‌ها

محورهای موضوعی : شیمی آلی

فاطمه رفیعی ¹ , نیلوفر تاج فر ²

1 - دانشیار گروه شیمی آلی، دانشکده شیمی، دانشگاه الزهرا، تهران، ایران
2 - دانشجوی کارشناسی ارشد شیمی آلی، دانشکده شیمی، دانشگاه الزهرا، تهران، ایران.

تاریخ دریافت : 1401/11/29 تاریخ پذیرش : 1402/06/04 تاریخ انتشار : 1402/09/01

کلید واژه: کیتوسان, پالادیم, نقاط کوانتومی مغناطیسی بر پایه کربن, کاهش نیتروآرن‌ها,

چکیده مقاله :

نانوذره های نقاط کوانتومی کربن بر پایه‌ کیتوسان مغناطیسی (Fe3O4@CQD) با کربن شدن زیست بسپار کیتوسان به روش آب گرمایی و سپس، مغناطیسی کردن آن با نانوذره های آهن اکسید (Fe3O4) تهیه شد. سپس در حضور نمک پالادیم کلرید در حلال اتانول تحت شرایط بازروانی بدون استفاده از معرف کاهنده، نانوذره های پالادیم بر سطح نانونقاط کوانتومی کربنی تثبیت شدند و در نهایت نانوکاتالیست Fe3O4@CQD@Pd به دست آمد. نانوکاتالیست تهیه شده با روش‌های متفاوت شامل PL، FTIR، FESEM، TEM، EDX، ICP، VSM و XRD شناسایی شد. کارایی این نانوکاتالیست مغناطیسی در واکنش کاهش مشتق های نیتروآرن با استخلاف‌های الکترون دهنده و الکترون کشنده ارزیابی شد. در حضور نانوکاتالیست تهیه شده، در دمای اتاق و حلال سبز آب و اتانول (1:1)، مشتق های آنیلین استخلاف دار در زمان کوتاه و با بازده عالی به دست آمدند. افزون براین، نانوکاتالیست با یک آهن ربای خارجی جدا و برای چهار چرخه‌ متوالی بدون کاهش در فعالیت کاتالیستی آن دوباره به کارگرفته شد.

چکیده انگلیسی:

Quantum dot carbon nanoparticles based on magnetic chitosan (Fe3O4@CQD) were prepared through hydrothermal carbonization of chitosan biopolymer and then magnetization with iron oxide (Fe3O4) nanoparticles. Then, in the presence of palladium chloride in ethanol as a solvent under reflux conditions without using a reducing agent, palladium nanoparticles were stabilized on the surface of carbon quantum dots, and finally, Fe3O4@CQD@Pd nanocatalyst was obtained. The prepared nanocatalyst was characterized by photoluminescence (PL), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), Inductively coupled plasma (ICP), Vibrating-sample magnetometry (VSM), and X-ray diffraction (XRD) techniques. The efficiency of this magnetic nanocatalyst was evaluated in the reduction reaction of nitroarene derivatives as environmental pollutants, with electron-donating and electron-withdrawing. In the presence of prepared nanocatalyst, at room temperature, and in H2O:EtOH (1:1) as green solvent, aniline derivatives were obtained in excellent yields at short reaction times. Moreover, the nanocatalyst was separated by applying an external magnet and reused at least for four successive runs without a decrease in its catalytic activity.

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