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

پژوهش های کاربردی در شیمی

مقاله 3، دوره 17، شماره 3، آذر 1402، صفحه 24-37   

نوع مقاله: پژوهشی

شناسه دیجیتال (DOI): 10.30495/jacr.2023.1980193.2104

نویسندگان

فاطمه رفیعی^{* 1}؛ نیلوفر تاج فر²

¹دانشیار گروه شیمی آلی، دانشکده شیمی، دانشگاه الزهرا، تهران، ایران

²دانشجوی کارشناسی ارشد شیمی آلی، دانشکده شیمی، دانشگاه الزهرا، تهران، ایران.

چکیده

       نانوذره­های نقاط کوانتومی کربن بر پایه‌ کیتوسان مغناطیسی (Fe₃O₄@CQD) با کربن­شدن زیست­بسپار کیتوسان به روش آب­گرمایی و سپس، مغناطیسی­کردن آن با نانوذره­های آهن اکسید (Fe₃O₄) تهیه شد. سپس در حضور نمک پالادیم کلرید در حلال اتانول تحت شرایط بازروانی بدون استفاده از معرف کاهنده، نانوذره­های پالادیم بر سطح نانونقاط کوانتومی کربنی تثبیت شدند و در نهایت نانوکاتالیست Fe₃O₄@CQD@Pd به­دست آمد. نانوکاتالیست تهیه­شده با روش‌های متفاوت شامل PL، FTIR، FESEM، TEM، EDX، ICP، VSM و XRD شناسایی شد. کارایی این نانوکاتالیست مغناطیسی در واکنش کاهش مشتق­های نیتروآرن با استخلاف‌های الکترون­دهنده و الکترون­کشنده ارزیابی شد. در حضور نانوکاتالیست تهیه­شده، در دمای اتاق و حلال سبز آب و اتانول (1:1)، مشتق­های آنیلین استخلاف­دار در زمان کوتاه و با بازده عالی به­دست آمدند. افزون­براین، نانوکاتالیست با یک آهن­ربای خارجی جدا و برای چهار چرخه‌ متوالی بدون کاهش در فعالیت کاتالیستی آن دوباره به­کارگرفته شد.

کلیدواژه‌ها

نقاط کوانتومی مغناطیسی بر پایه کربن؛ کیتوسان؛ پالادیم؛ کاهش نیتروآرن‌ها

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