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سنتز و شناسایی نانوذرات سوپرپارامغناطیسی اکسید گرافن- اکسید آهن پوشاندهشده با چیتوزان و اصلاحشده با اسید امینه | ||
فصلنامه علمی - پژوهشی مواد نوین | ||
مقاله 5، دوره 9، شماره 34 - شماره پیاپی 2، بهمن 1397، صفحه 61-76 اصل مقاله (1.96 M) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسندگان | ||
معصومه عمادی* 1؛ بیژن هنرور2؛ رضا زارعی نژاد2 | ||
1گروه شیمی دانشکده علوم دانشگاه آزاد اسلامی واحد مرودشت | ||
2گروه مهندسی شیمی، واحد مرودشت ، دانشگاه آزاد اسلامی ، مرودشت ، ایران | ||
تاریخ دریافت: 26 تیر 1397، تاریخ بازنگری: 09 مهر 1397، تاریخ پذیرش: 11 بهمن 1397 | ||
چکیده | ||
نانوذرات موادی امیدبخش با کاربردهای مختلف هستند که اصلاح سطح آنها یک تکنیک مهم برای توسعهی این کارآییها میباشد. در این پژوهش یک نانوساختار جدید طی چهار مرحله سنتز شد که میتواند به منظور حذف آلایندهها از پساب مورد استفاده قرار گیرد. نخست نانوذرات اکسید گرافن (GO) به روش هامر اصلاحشده سنتز و سپس با ترسیب همزمان یونهای فروس و فریک در یک محیط بازی بر سطح نانوذرات، اکسید گرافن، مغناطیسی گردید. پس از آن نانوذرات اکسید گرافن مغناطیسی (m-GO) با پلیمرهای ساکاریدی چیتوزان، با اتصال کووالانسی پوشش داده شدند. سپس نانوذرات اکسید گرافن مغناطیسی پوشش داده شده با چیتوزان (m-GO@Chi)، با روش اتصال عرضی به ترکیب بازشیف سیستئین-گلوتارآلدهید (CG) متصل شده و سطح آن با اسیدآمینهی گوگرددار سیستئین اصلاح شد (m-GO@Chi-Cys). بعد از آن فرآیند اصلاح سطح نانوذرات با استفاده از آنالیزهای شناسایی، بررسی شد. نتایج طیفسنجی FT-IR حاکی از آن بود که اصلاح سطح در هر مرحله موفقیتآمیز بوده و حضور گروههای عاملی اپوکسید، کربونیل، آمینو و تیول در سطح نانوذرات تایید شد. مطابق تصاویر FESEM، ذرات GO سنتز شده دو بعدی و با ضخامت میانگین 165-29 نانومتر بودند و پس از مغناطیسی شدن، نانوذرات اکسید آهن با اندازهی میانگین 50-35 نانومتر در سطح GO مشاهده شد. جهت بررسی خواص مغناطیسی نانوذرات از آنالیز VSM استفاده شد. عدم وجود پسماند در نمودار مغناطیسی شدن نانوذرات و کاهش قابل اغماض در مغناطش اشباع نانوذرات m-GO@Chi-Cys در مقایسه با m-GO را نشان داد که به دلیل حضور لایهی نازک چیتوزان بر روی ذرات اولیه است. | ||
کلیدواژهها | ||
نانوذرات اصلاحشده؛ سوپرپارامغناطیس؛ اکسید گرافن؛ مگنتیت؛ سیستئین | ||
عنوان مقاله [English] | ||
synthesis and Identification of superparamagnetic graphene oxide- Iron oxide nanoparticles coated by chitosan and modified by Amino acid | ||
نویسندگان [English] | ||
Masoomeh Emadi1؛ bizhan honarvar2؛ Reza Zareinezhad2 | ||
1Chemistry department. Islamic Azad university, Marvdasht Branch, Marvdasht Iran | ||
2Department of Chemical engineering, Marvdasht Branch , Islamic Azad University, Marvdasht , Iran | ||
چکیده [English] | ||
Nanoparticles are promising materials with a variety of applications, whose surface modification is an important technique for developing these applications. In this study, a new nanostructure was synthesized in four steps that can be used to remove pollutants from wastewater. Firstly, the graphene oxide nanoparticles (GO) were synthesized by the modified Hummer method, and then by simultaneous precipitation of ferrous and ferric ions in based atmosphere on the surface of GO, graphene oxide was magnetized. Subsequently, magnetic nanoparticles of graphene oxide (m-GO) coated by chitosan saccharide polymer with covalent bonding. The magnetic graphene oxide nanoparticles coated with chitosan (m-GO@Chi) were bonded to the cysteine-glutaraldehyde schiff’s base (CG) with cross-linking method and their surface modified with cysteine (m-GO@Chi-Cys). After that, the nanoparticle surface correction process was investigated by using og identification analyzes. The results of the FT-IR spectroscopy indicated that surface modification was successful at each stage and the presence of epoxide, carbonyl, amino, and thiol functional groups at the nanoparticles level was confirmed. According to FESEM images, GO particles were synthesized in two dimensional and average thicknesses of 29-165nm and after magnetization, iron oxide nanoparticles with a mean size of 35-50nm were observed at the GO level. VSM analysis was used to study the magnetic properties of nanoparticles. The absence of residues in the nanosize magneticization curve and the negligible reduction in the saturation magnetization of m-GO@Chi-Cys nanoparticles, as compared to m-GO, is due to the presence of thin layer of chitosan on the primary particles. | ||
کلیدواژهها [English] | ||
Modified nanoparticles, Superparamagnetism, Graphene oxide, Magnetite, Cysteine | ||
مراجع | ||
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