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

الموضوعات :

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.

تاريخ الإرسال : 27 السبت , رجب, 1444 تاريخ التأكيد : 10 السبت , صفر, 1445 تاريخ الإصدار : 08 الأربعاء , جمادى الأولى, 1445

الکلمات المفتاحية: کیتوسان, پالادیم, نقاط کوانتومی مغناطیسی بر پایه کربن, کاهش نیتروآرن‌ها,

ملخص المقالة :

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.

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