نشریه محیط زیست طبیعی

سنتز نانوکامپوزیت اکسید گرافن مغناطیسی پلیمرشده با گروه آمین به‌منظور حذف کروم با کاربرد روش سطح پاسخ

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه محیط زیست، واحد قشم، دانشگاه آزاد اسلامی، قشم، ایران

2 گروه علوم و مهندسی محیط زیست، دانشکده منابع طبیعی و محیط زیست، واحد علوم و تحقیقات دانشگاه آزاد اسلامی تهران، ایران

3 گروه علوم و مهندسی محیط زیست، دانشکده منابع طبیعی ، واحد بندرعباس، دانشگاه آزاد اسلامی، بندرعباس، ایران

4 گروه شیمی، دانشکده علوم پایه، واحد تهران مرکز، دانشگاه آزاد اسلامی، تهران، ایران

چکیده

کروم معمولاً به دو شکل سه ظرفیتی و شش ظرفیتی در سیستم­ های آبی وجود دارد. هر دو حالت کروم ویژگی­ های شیمیایی، زیستی و محیطی متفاوتی دارند. عنصر کروم در انواع کاربردهای صنعتی استفاده می ­شود، از این‌رو، مقادیر زیادی کروم در محیط تخلیه می­ شود. در این مطالعه از نانوکامپوزیت اکسید گرافن مغناطیسی پلیمر شده با گروه آمین 5-آمینو ایزو فتالیک اسید برای حذف فلز کروم از محیط‌های آبی با استفاده از روش سطح ‌پاسخ - طراحی مرکب مرکزی به‌منظور بهینه‌سازی فرآیند جذب استفاده شد. شناسایی گروه ­های عاملی نانو جاذب سنتز شده توسط دستگاه طیف‌سنج مادون قرمز تبدیل فوریه (FTIR)، میکروسکوپ الکترونی روبشی (SEM)، وزن‌سنجی گرمایی (TGA) و آنالیز مغناطیس‌سنجی (VSM) انجام گردید. نتایج بهینه‌سازی براساس مدل سطح ‌پاسخ نشان داد که مقدار بهینة متغیر pH برابر با 3/5، غلظت ابتدایی فلز در محلول 55 میلی‌گرم در لیتر، مقدار جاذب 25 میلی‌گرم و زمان تماس جاذب 37/5 دقیقه به‌دست آمد. همچنین نتایج بررسی مدل ­های هم دمای جذب نشان داد که مدل لانگمویر با مقدار R2، 0/99 انطباق بیشتری با فرآیند جذب کروم توسط جاذب سنتز شده دارد و حداکثر ظرفیت جذب براساس مدل لانگمویر 90/90 میلی‌گرم بر گرم به‌دست آمد. بررسی فرآیند ترمودینامیک جذب، بیانگر این است که فرایند جذب گرماگیر است و با افزایش دما ظرفیت جذب افزایش می ­یابد. به‌طور کلی نتایج به‌دست‌آمده در این مطالعه نشان می‌دهد که انتظار می‌رود نانوکامپوزیت اکسید گرافن مغناطیسی پلیمر شده با گروه آمین یک جاذب مؤثر برای حذف کروم از سیستم آبی باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Synthesis of amine group polymerized magnetic graphene oxide nanocomposites for chromium removal using response surface methodology

نویسندگان [English]

  • Nahal Nakhlestani 1
  • Lobat Taghavi 2
  • Mohsen Dehghani 3
  • Homayon Ahmad Panahi 4

1 Department of Environmental Science, Qeshm branch, Islamic Azad university, Qeshm, Iran

2 Department of Environmental Science, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran

3 Department of Environmental Science, Faculty of Natural Resources, Bandar Abbas Branch, Islamic Azad University, Bandar Abbas, Iran.

4 Department of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, Iran

چکیده [English]

Chromium exists usually in both trivalent and hexavalent forms in aqueous systems. The two-oxidation states of chromium have different chemical, biological and environmental characteristics. Chromium is used in a variety of industrial applications; hence, large quantities of chromium are discharged into the environment. In this study, a magnetic graphene oxide nanocomposite polymerized with a 5-Aminoisophthalic acid amine group was used to remove chromium metal from aqueous media using the Central Composite Design for Response Surface method to optimize the adsorption process. To identify functional groups of synthesized nanoadsorbents use of the Fourier transform infrared spectroscopy (FTIR), the scanning electron microscopy (SEM) and the thermal gravimetric analysis (TGA). The optimization results based on the response surface model showed that the optimum value of the pH variable was 3.5, the initial concentration of the metal in solution was 55 mg / l, the adsorbent amount was 25 mg and the adsorbent contact time was 37.5 minutes. Also, the results of the adsorption isotherm models showed that the Langmuir model with a value of R2, 0.99 is more suitable with the adsorption process of chromium by the synthesized adsorbent and the maximum adsorption capacity based on the Langmuir model was 90.90 mg/g. Examination of the adsorption thermodynamic process indicates that the adsorption process has been endothermic and the adsorption capacity increases with increasing temperature. Overall, the results obtained in this study illustrate that the magnetic graphene oxide nanocomposite polymerized with amine group is expected to be an effective and economically viable adsorbent for Cr(VI) removal from aqueous system.

کلیدواژه‌ها [English]

  • Chromium
  • Adsorption
  • Response surface model
  • Aqueous environment
  • Polymer
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نشریه محیط زیست طبیعی
دوره 75، شماره 2 - شماره پیاپی 2
تیر 1401
صفحه 195-207