پژوهش های کاربردی مهندسی شیمی - پلیمر
فصلنامه علمی - پژوهشی

ساخت غشای نانوکامپوزیتی برپایه پلی اتر بلاک آمید/پلی وینیل الکل پر شده با نانو ذرات منیزیم اکسید به منظور بررسی خواص عبورپذیری انتخابی

نوع مقاله : پژوهشی اصیل

نویسندگان

ساناز ابراهیمی 1
حسن عبادی دهاقانی 2
مجید کلاهدوزان 3
الهام عامری 3

1 دانشجو

2 استادیار

3 دانشیار

چکیده
فرضیه­: یکی از روش های بهبود غشاهای ماتریس مخلوط نانوکامپوزیتی استفاده از نانوذرات و ترکیبات حاوی گروه ­های عاملی هیدروکسیل و کربوکسیل است که می ­تواند انتخابی مناسب برای کمک به نفوذ بیشتر گاز CO2 باشد. در پژوهش حاضر، گزینش­ پذیری و نفوذ پذیری ماتریس پلی اتر بلوک آمید/پلی وینیل الکل (Pebax/PVA) با بارگذاری نانوذره اکسید منیزیم (MgO) بررسی شد. طبق مطالعات پیشین حضور MgO در ماتریس Pebax/PVA می­ تواند با ایجاد فضای بین مولکولی، نفوذپذیری CO2 را افزایش ­دهد.

روش ­ها: در این پژوهش، غشای نانوکامپوزیتی پلی اتر بلوک آمید/پلی وینیل الکل (Pebax/PVA) با نسبت وزنی 80 به 20 حاوی 10% نانوذره اکسید منیزیم (MgO) به روش ریخته ­گری محلول ساخته شد. عملکرد نانوکامپوزیت Pebax/PVA/MgO به منظور جداسازی گازهای CH4و CO2 با آزمون های مختلف مورد ارزیابی قرار گرفت.

یافته ­ها: مشخصه ­یابی غشاهای ساخته شده به وسیله آزمون ­های تبدیل فوریه مادون قرمز (FTIR)، پراش پرتو ایکس (XRD) و میکروسکوپ الکترونی روبشی گسیل میدانی (FESEM) مورد بحث قرار گرفت. تصاویرFESEM نشان داد زبری سطح با افزودن نانوذرات افزایش یافته و نانوذرات به خوبی در ماتریس پلیمری پراکنده شده ­اند.تجزیه و تحلیل نتایج XRD نشان داد که نانوذره MgO برهمکنش بیشتری با زنجیره ­های PVA نسبت به زنجیره ­های Pebax دارد. پارامترهای مختلفی شامل محتوای پلی وینیل الکل و محتوای نانوذره MgO، فشار و دما به عنوان متغیرهای مستقل انتخاب و اثرات آنها بر نفوذ پذیری گازهای CH4 و CO2 مطالعه شد. میزان نفوذپذیری غشاهای ساخته شده مورد بررسی قرار گرفت. براساس نتایج دریافتی میزان نفوذپذیری گازهای CH4 و CO2 با افزودن MgO به طور قابل توجهی افزایش می­ یابد.

کلیدواژه‌ها

پلی اتر بلاک آمید
اکسید منیزیم
جداسازی CH4 /CO2
تراوایی و انتخاب پذیری

موضوعات

عنوان مقاله English

Fabrication of nanocomposite membrane based on polyether block amide/polyvinyl alcohol filled with magnesium oxide nanoparticles in order to investigate selective permeability properties

نویسندگان English

Sanaz Ebrahimi 1
Hassan Ebadi-Dehaghani 2
majid kolahdoozan 3
elham ameri 3
1 Islamic Azad University Shahreza
2 Islamic Azad University Shahreza
3 Shahreza Islamic Azad University
چکیده English

Hypothesis: One potential method for improving nanocomposite mixed matrix membranes is through the use of nanoparticles and compounds containing hydroxyl and carboxyl groups, which may aid in the penetration of CO2 gas. In this study, we investigated the selectivity and permeability of a polyether block amide/polyvinyl alcohol (Pebax/PVA) nanocomposite membrane containing magnesium oxide (MgO) nanoparticles. Previous research has shown that the addition of MgO to the Pebax/PVA matrix can increase CO2 permeability by creating an intermolecular space.

Methods: Prepared a Pebax/PVA nanocomposite membrane with a weight ratio of 80:20, containing 10% MgO nanoparticles, through a solution casting method. Evaluated the performance of the Pebax/PVA/MgO nanocomposite membrane for separating CH4 and CO2 gases using various tests.

Findings: Characterized the membranes through Fourier transform infrared (FTIR), X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM) tests. FESEM images showed increased surface roughness with the addition of nanoparticles, and the nanoparticles were well dispersed within the polymer matrix. XRD analysis indicated that MgO nanoparticles had more interaction with PVA chains than with Pebax chains, and peaks at 42° and 62° regions were formed due to the placement of MgO nanoparticles among the polymer chains. We studied various parameters, including polyvinyl alcohol and MgO nanoparticle content, pressure, and temperature, as independent variables and examined their effects on the permeability of CH4 and CO2 gases. We measured the permeability of the constructed membranes and found that the addition of MgO significantly increased the permeability of CH4 and CO2.

کلیدواژه‌ها English

Polyether block amide
CO2/CH4 separation
permeability
Selectivity
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