نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه آموزش فیزیک، دانشگاه فرهنگیان، صندوق پستی: 889-14665، تهران- ایران
2 پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران- ایران
چکیده
در این تحقیق، جاذب گرافن اکساید (GO) با روش هامرز اصلاح شده تهیه گردید و با آمینومتیل فسفنیک اسید عامل‌دار شده و به‌کارگیری آن در جذب یون‌های استرانسیم از محلول‌های آبی در فرایند ناپیوسته مورد بررسی قرار گرفت. مشخصه‌یابی جاذب‌ها با TEM و FT-IR انجام گرفت. تصاویر TEM گرافن اکساید عامل‌دارشده نشان داد که ورقه‌های شفاف گرافنی به صورت موج‌دار تشکیل شده‌اند. هم‌چنین طیف FT-IR نشان داد که گرافن اکساید به خوبی با آمینومتیل فسفنیک اسید عامل‌دار شده و گروه‌های عاملی اکسیژن‌دار کاهش یافته است. برهم‌کنش پارامترهای pH، مقدار جاذب، و دما با استفاده از طراحی آزمایش روش سطح پاسخ مورد بررسی قرار گرفته است. مدل درجه دوم به خوبی با داده‌های آزمایشگاهی مطابقت داشت. نتایج نشان داد که خطای سیستماتیک در انجام آزمایش‌ها وجود ندارد و صحت‌سنجی مدل با آزمایش‌های تصادفی نشان‌دهنده خطای کم مقادیر پیش‌بینی شده توسط مدل بود. داده‌های سینتیکی با سه مدل شبه مرتبه اول، شبه مرتبه دوم و دو نمایی آنالیز شد و داده‌های آزمایشگاهی تطابق بهتری با مدل شبه مرتبه دوم داشت. نتایج تحقیق نشان داد که گرافن اکساید عامل‌دارشده با آمینومتیل فسفنیک اسید قابلیت خوبی برای جذب استرانسیم از محلول‌های آبی دارد.
کلیدواژه‌ها
عنوان مقاله [English]
Study functionalized graphene oxide performance for strontium adsorption from aqueous solutions using response surface methodology
نویسندگان [English]
- F. Vaziri Alamdarlo 1
- F. Zahakifar 2
- N. Salek 2
1 Physics Education Department, Farhangian University, P.O.Box: 14665-889, Tehran-Iran
2 Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486, Tehran - Iran
چکیده [English]
In this study, graphene oxide (GO) adsorbent was prepared by modified Hummer’s method and functionalized with aminomethylphosphonic acid. Its application to the adsorption of Sr ions from aqueous solutions in a batch sorption process was investigated. Adsorbents were characterized by TEM and FT-IR. The TEM images of functionalized graphene oxide showed that graphene sheets are formed in wavy sheets. The FTIR spectrum revealed that graphene oxide was highly functionalized with aminomethylphosphonic acid and oxygenated functional groups were reduced. Response surface methodology investigates pH, adsorbent dosage, and temperature parameters. The quadratic model corresponds well with the experimental data. The results illustrated that there is no systematic error in the experiments. The verification of the model with random experiments showed a low error in the values predicted by the model. The kinetic data were analyzed by Pseudo-first-order, Pseudo-second-order, and Double- exponential kinetic models, and experimental data were well modeled by the pseudo-second-order kinetic model. The research results showed that graphene oxide functionalized with aminomethylphosphonic acid has a good ability to strontium adsorption from aqueous solutions.
کلیدواژه‌ها [English]
- Functionalized graphene oxide
- Strontium
- response surface methodology
- Aminomethylphosphonic acid
- Aqueous solution
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