پلی اکسومتالات پرایسلر نهش یافته بر نانو ذرات گرافن اکسید عامل دار: سنتز، شناسایی و بررسی فعالیت کاتالیزوری آن
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین
1 - گروه شیمی، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران
کلید واژه: نانوذره, گرافن اکسید, پلی اکسومتالات, پرایسلر, اکسیم,
چکیده مقاله :
مقدمه: نانو ذرات حاصل از گرافن اکسید (GO) در دو دهه اخیر بسیار مورد توجه محققان علوم مختلف ازجمله شیمی بودهاند. همچنین عاملدار نمودن گرافن اکسید میتواند 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، آنها توسط پلی آمین عاملدار (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 ویژگیهای منحصر به فردی است و به دلیل داشتن تعداد زیادی پروتون اسیدی، از آن به عنوان کاتالیزور اسید لویس استفاده میشود. ساختار این نانوذرات جدید به وسیله روشهای 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 طیفهای 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 03/0 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 میباشد.
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.
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