پلی اکسومتالات پرایسلر نهش یافته بر نانو ذرات گرافن اکسید عامل دار: سنتز، شناسایی و بررسی فعالیت کاتالیزوری آن

نوع مقاله : مقاله پژوهشی

نویسنده

• علی جاوید

گروه شیمی، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران

10.30495/jnm.2024.33116.2034

چکیده

چکیده
مقدمه: نانو ذرات حاصل از گرافن اکسید (GO) در دو دهه اخیر بسیار مورد توجه محققان علوم مختلف ازجمله شیمی بوده­ اند. همچنین عامل ­دار نمودن گرافن اکسید می­ تواند سبب بهبود خواص کاربردی آن شود. در شیمی صنعتی، یکی از مهم ترین کاربردهای گرافن اکسید عامل دار شده استفاده از آن به عنوان کاتالیزور است.
روش­: در این پروژه پس از تهیه نانوذرات گرافن اکسید، آن ها توسط پلی آمین عامل­ دار (GO-NH₂) و در ادامه به وسیله هتروپلی اسید پرایسلر نهش داده شدند (Pr@GO-NH₂). پرایسلر یکی از انواع کلاسترهای پلی اکسومتالات است که دارای ویژگی­ های منحصر به فردی است و به دلیل داشتن تعداد زیادی پروتون اسیدی، از آن به عنوان کاتالیزور اسید لویس استفاده می­ شود. ساختار این نانوذرات جدید به وسیله روش ­های طیفی مانند پراش اشعه ایکس، طیف سنج مادون قرمز، میکروسکوپ الکترونی روبشی، میکروسکوپ الکترونی عبوری و آنالیز توزین حرارتی مورد بررسی قرار گرفت. همچنین پس از تهیه Pr@GO-NH₂، میزان فعالیت کاتالیستی آن در واکنش تهیه اکسیم از آلدهید و هیدروکسیل آمین سنجیده شد. 
یافته­ ها: با استفاده از روش­های طیفی نام برده و مقایسه برخی از طیف­ های Pr@GO-NH₂ با GO-NH₂ و GO، ساختار نانوذرات Pr@GO-NH₂ شناسایی و تایید گردید. همچنین تهیه اکسیم در حضور این نانوذرات مؤید فعالیت کاتالیستی بالای آن بود. براساس نتایج به دست آمده، این واکنش در حضور مقدار 0/03 گرم از کاتالیزور در دمای 50 درجه سانتی گراد، زمان 30 دقیقه و در حضور آب به عنوان حلال سازگار با محیط زیست انجام شد.
نتیجه­ گیری: امکان استفاده از حلال سبز آب، قابلیت بازیافت و استفاده مجدد از کاتالیزور، انجام واکنش در دمای پایین، نیاز به مقدار کم کاتالیزور برای پیشرفت واکنش و راندمان بالای محصولات به دست آمده، همگی از مزایای استفاده از نانوذرات Pr@GO-NH₂ درنقش کاتالیزور اسیدی می ­باشد.

کلیدواژه‌ها

• نانوذره
• گرافن اکسید
• پلی اکسومتالات
• پرایسلر
• اکسیم

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عنوان مقاله [English]

Preysler polyoxometalate supported on functionalized graphene oxide nanoparticles: synthesis, identification and investigation of its catalytic activity

نویسنده [English]

• Ali Javid

Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran

چکیده [English]

Abstract
Introduction: In the last two decades, nanoparticles obtained from graphene oxide (GO) have been of great interest to researchers in various sciences, including chemistry. Also, the functionalization of graphene oxide can improve its functional properties. In industrial chemistry, one of the most important applications of functionalized graphene oxide is its use as a catalyst.
Methods: In this project, after preparing graphene oxide nanoparticles, they were grafted by functionalized polyamine (GO-NH₂), and then by Preissler's heteropolyacid (Pr@GO-NH₂). Preysler is one of the types of polyoxometalate clusters, which has unique characteristics and is used as a Lewis acid catalyst due to having a large number of acidic protons. The structure of these new nanoparticles was investigated by spectral methods such as XRD, FTIR, SEM, TEM, EDX and TGA. Also, after preparing Pr@GO-NH₂, its catalytic activity was measured in the reaction of producing oxime from aldehyde and hydroxylamine.
Findings: By using the mentioned spectral methods and comparing some spectra of Pr@GO-NH₂ with GO-NH₂ and GO, the structure of Pr@GO-NH₂ nanoparticles was identified and confirmed. Also, the preparation of oxime in the presence of these nanoparticles confirmed its high catalytic activity. Based on the obtained results, this reaction was carried out in the presence of 0.03 grams of catalyst at 50°C for 30 minutes and in the presence of water as an environmentally friendly solvent.

کلیدواژه‌ها [English]

• Nanoparticle
• Graphene oxide
• Polyoxometalate
• Preysler
• Oxime

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