پژوهش های کاربردی مهندسی شیمی - پلیمر
فصلنامه علمی - پژوهشی

تهیه‌ی غشاهای شبکه‌آمیخته حاوی نانوذرات اکسید آهن نیکل روی جهت جداسازی گازهای دی‌اکسیدکربن، نیتروژن و متان

نوع مقاله : پژوهشی اصیل

نویسندگان

سعید کلانتری 1
محمدرضا امیدخواه 1
آبتین عبادی عموقین 2

1 دانشگاه تربیت مدرس، دانشکده مهندسی شیمی

2 دانشگاه اراک

چکیده
در چند سال اخیر به­دلیل افزایش گازهای گلخانه­ای در جو کره­ی زمین، مشکلات زیست محیطی فراوانی ایجاد شده است. در دهه گذشته، غشاهای شبکه­آمیخته به­دلیل توانایی مناسب در جداسازی گازهای قطبی از غیرقطبی، بسیار مورد توجه قرار گرفته شده است. در این پژوهش غشای شبکه آمیخته­ی دو جزئی جدید با افزودن نانوذره­ی اکسید آهن نیکل روی به شبکه پلیمری پباکس تهیه شد تا در کنار ویژگی‌های منحصر بفرد این کوپلیمر مانند مقاومت مکانیکی بالا و تراوایی مناسب گازی، از ویژگی‌های نانوذره‌ی مذکور مانند تراوایی و گزینش­پذیری قابل‌توجه و پایداری مکانیکی و گرمایی مناسب آن استفاده شود. آزمون تراوایی گازی بر روی غشاهای پلیمری خالص و شبکه آمیخته‌ی دوجزئی در دمای ۳۵ درجه‌ی سانتیگراد و فشارهای ۲ تا ۱۰ بار انجام شد. همچنین غشاهای ساخته‌شده با آزمون­های FESEM، FTIR-ATR، DSC و XRD مورد ارزیابی قرار گرفتند. نتایج نشان دادند که در غشای بهینه حاوی ۱ درصد وزنی نانوذره در بستر پلیمر، مقدار تراوایی گاز CO2 نسبت به غشای پلیمری خالص در فشار ۱۰ بار، بیش از ۱۲۸ درصد بهبود یافت و به حدود ۲۷۸ بارر رسید و این در حالی بود که گزینش پذیری‌های CO2/CH4 و CO2/N2 نیز به ترتیب ۱۷۵ و ۱۸۳ درصد بهبود پیدا کردند. دلیل اصلی این بهبود، حضور اتم­های آهن، نیکل و روی در نانوذره­ی به­کار گرفته شده بود که موجب ایجاد برهمکنش بهتر غشای ساخته­شده با گاز CO2 گردید. همچنین به­دلیل وجود بخش­های CO2 دوست در ساختار پلیمر پباکس، تراوایی CO2 در مقایسه با گازهای N2 و CH4، بسیار بیشتر می­شود.

کلیدواژه‌ها

غشای شبکه آمیخته
جداسازی گاز
اکسید آهن نیکل روی

موضوعات

عنوان مقاله English

Preparation of mixed matrix membranes containing nickel iron oxide nanoparticles for separation of carbon dioxide, nitrogen and methane

نویسندگان English

Saeed Kalantari 1
Mohammadreza Omidkhah 1
Abtin Ebadi Amooghin 2
1 Faculty of Chemical Engineering, Tarbiat Modares University
2 Arak University
چکیده English

Research subject: In recent years, researchers have proposed various methods for gas separation because of rising greenhouse gases in the atmosphere and causing enormous environmental problems. One of the newest and emerging methods is membrane gas separation. In the last decade, mixed matrix membranes (MMMs) have received much attention due to their ability to successful separation of polar gases from mixtures.

Research approach: In this study, a novel two-component mixed matrix membrane was prepared by incorporating the nickel zinc iron oxide nanoparticles into the Pebox polymer matrix. This is owing to combination the unique features of Pebax copolymer such as high mechanical strength and gas permeability, with nanoparticle properties as considerable permeability and selectivity, and appropriate mechanical and thermal stability. The gas permeability test was performed for pristine membrane and MMMs at 35 °C and pressure range from 2 to 10 bar. Fabricated membranes were also evaluated by FESEM, FTIR-ATR, DSC and XRD tests

Main results: Results demonstrated that in the case of the optimum membrane with 1 wt.% of filler loading and at 10 bar, the CO2 permeability was increased about 128% and reached to 278 Barrer, compared to pristine membrane. However, the CO2/CH4 and CO2/N2 selectivities were improved by 175 and 183 percent, respectively. This superior results was due to the presence of iron, nickel, and zinc atoms in the filler structure, which resulted in a better interaction with CO2. On the other hand, the presence of CO2-friendly segments in the Pebax structure caused much higher CO2 permeability in comparison with other light gases.

کلیدواژه‌ها English

mixed matrix membrane
gas separation
Nickel zinc iron oxide
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