کارایی هیدروژل نانوچندسازه ای کربوکسی متیل سلولز و آلژینات حاوی نانوصفحه های گرافن اکسید برای حذف رنگزای متیلن بلو
محورهای موضوعی : شیمی پلیمر
سید جمال الدین پیغمبردوست
1
(استاد دانشکده مهندسی شیمی و نفت، دانشگاه تبریز، تبریز، ایران)
عباس مصطفایی
2
(دانشجوی کارشناسی ارشد دانشکده مهندسی شیمی و نفت، دانشگاه تبریز، تبریز، ایران.)
پریسا محمدزاده پاکدل
3
(دانشجوی دکترا دانشکده مهندسی شیمی و نفت، دانشگاه تبریز، تبریز، ایران.)
موسی محمدپورفرد
4
(دانشیار دانشکده مهندسی شیمی و نفت، دانشگاه تبریز، تبریز، ایران)
کلید واژه: هیدروژل نانوکامپوزیتی, متیلن بلو, جاذب, گرافن اکسید , تصفیه پساب.,
چکیده مقاله :
امروزه با گسترش صنایع و شهر نشینی آلودگی منابع و نیاز به آب سالم افزایش یافته است. هیدروژل ها جاذب هایی مؤثر برای حذف آلاینده ها از منابع آبی هستند. در این پژوهش، از نانو صفحه های گرافن اکسید برای بهبود حذف رنگزای متیلن بلو با هیدروژل کربوکسی متیل سلولز و آلژینات که زیست‌سازگار هستند، استفاده شده است. هیدروژل های نانوچندسازه کربوکسی متیل سلولز و آلژینات حاوی نانو صفحه های گرافن اکسید کارایی خوبی در مقایسه با هیدروژل های سنتزشده با روش شیمیایی نشان دادند. جاذب های سنتزشده با تجزیه وزن سنجی گرمایی و میکروسکوپ الکترونی روبشی شناسایی شدند. درصد های وزنی متفاوتی از گرافن اکسيد (0 تا 10 درصد وزنی) بر بستر هیدروژل بارگذاری شد و مقدار بهینه آن 6 درصد وزنی به دست آمد. بازده حذف در شرایط بهینه (غلظت اولیه رنگزا برابر با ۵۶ میلی گرم بر لیتر، ۵/۱ گرم بر لیتر از جاذب، ۱۲۰ دقیقه زمان تماس و دمای ۲۵ درجه سلسیوس) برای جاذب‌های CMC/Alg و CMC/Alg/GO به ترتیب ۳۷/۶۵ و ۱/۷۳ درصد به دست آمد. بررسی داده های سنتیکی نشان دادند که مدل شبه‌درجه دوم به ترتیب دارای ضريب تعیین (R2) برابر ۹۸۶/۰ و ۹۸۳/۰ برای جاذب های CMC/Alg و CMC/Alg/GO هستند. ظرفیت برجذب تک‌لایه برای جاذب های CMC/Alg و CMC/Alg/GO به ترتیب ۷۴/۹۱ و ۱۵/۹۶ میلی گرم بر گرم به دست آمد که بهبود ظرفیت برجذب با افزودن گرافن اکسيد را نشان داد. بررسی ترمودینامیکی نشان داد فرایند برجذب خودبه خودی و گرماگیر است. با توجه به نتیجه های به دست آمده هیدروژل نانو چندسازه بهینه می تواند به عنوان جاذب مؤثر برای حذف رنگزای متیلن بلو به کار رود.
Today, with the development of industries and urbanization, the need for healthy water have increased. Hydrogels are effective adsorbents for removing pollutants from water sources. In this research, graphene oxide (GO) nanosheets were used to improve the performance of methylene blue dye removal by carboxymethyl cellulose hydrogel and alginate, which were biocompatible. Carboxymethyl cellulose and alginate nanocomposite hydrogels containing graphene oxide nanosheets showed good performance compared to hydrogels synthesized by chemical method. The synthesized adsorbents were characterized by thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). Different weight percentages of GO (0-10 wt. %) were incorporated in the hydrogel matrix and obtained optimal value was 6 wt. %. The obtained removal efficiency was 65.4 and 73.1 % for CMC/Alg and CMC/Alg/GO, respectively, under optimal conditions (initial concentration of 56 mg/l, adsorbent dose of 1.5 g/l, 120 min contact time, and 25 °C temperature). Analysis of kinetic data showed that the pseudo-second-order model had R2 order of 0.986 and 0.983 for CMC/Alg and CMC/Alg/GO adsorbents, respectively. Therefore, it was the most suitable model for kinetic data fitting. Monolayer adsorption capacity for CMC/Alg and CMC/Alg/GO adsorbents was 91.74 and 96.15 mg/g, respectively, which showed the improvement of the adsorption by incorporation of GO. Thermodynamic investigation showed that the adsorption process is spontaneous and endothermic. Finally, it can be concluded that the synthesized nanocomposite hydrogel can be used as an effective adsorbent for the decontamination of methylene blue dye.
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