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حذف فسفات از منابع آبی با استفاده از نانوکیتوسان اصلاح شده با لانتانیوم

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 گروه محیط زیست، پژوهشگاه نیرو، تهران، تهران، ایران

2 پژوهشکده نیمه‌هادی‌ها، پژوهشگاه مواد و انرژی، مشکین دشت، البرز، ایران

چکیده

جاذب زیست ­دوست نانوکیتوسان، از طریق ژل شدن یونی، سنتز و جهت بهبود کارایی و عملکرد، با لانتانیوم، اصلاح گردید. برای شناسایی جاذب­ های سنتز شده، از روش ­های طیف سنجی زیر قرمز تبدیل فوریه (FT-IR)، پراش پرتو ایکس (XRD)، میکروسکوپ الکترونی روبشی (SEM)، طیف‌سنجی پراکندگی انرژی پرتو ایکس (EDX) و جذب-واجذب نیتروژن، ‪استفاده و پس از تأیید، جاذب نانو­ساختار، به عنوان جاذبی مناسب برای حذف فسفات، استفاده گردید. به منظور تصحیح نتایج حاصل از فرآیند جذب، مدل­ های جذبی لانگمویر و فروندلیچ، مورد استفاده قرار گرفت. نتایج به دست آمده نشان داد جذب فسفات روی جاذب نانوکیتوسان اصلاح شده با لانتانیوم، از ایزوترم لانگمویر، پیروی می­ کند. بیشینه ظرفیت جذب، 92/144 میلی­ گرم بر گرم است. هم چنین، زمان تعادل فرآیند جذب نیز روی نانوکیتوسان اصلاح شده با لانتانیوم، بررسی شد و داده های آزمایشی، نشان داد که زمان لازم برای رسیدن به تعادل، 30 دقیقه است. اطلاعات سینتیکی بدست آمده، مورد ارزیابی مدل های سینتیکی شبه درجه اول، شبه درجه دوم و نفوذ درون ذره ای، قرارگرفت. بررسی سه مدل سینتیکی، نشان داد که فرآیند جذب با ضریب همبستگی 9967/0، تطابق خوبی با مدل شبه درجه دوم دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Removal of Phosphate from Aqueous Media by Lanthanum Modified Nanochitosan

نویسندگان [English]

  • Samira Salehi 1
  • Mojtaba Hosseinifard 2

1 Environment Research Environment Research Department, Energy and Environment Research Center, Niroo Research Institute, Tehran, Tehran, Iran

2 Department of Semiconductors, Materials and Energy Research Center, MeshkinDasht, Alborz, Iran

چکیده [English]

The biosorbent nanochitosan was synthesized by the ionic gelation and modified with lanthanum to improve efficiency and performance. The features of synthesized adsorbents were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray diffraction (EDX) and nitrogen adsorption–desorption isotherms and after confirming the nanostructure adsorbent, used as a suitable adsorbent for phosphate removal. In order to correct the results of the adsorption process, Langmuir and Freundlich adsorption models were used. The results showed that the adsorption of phosphate on lanthanum-modified nanocitosan adsorbent follows the Langmuir isotherm and the maximum adsorption capacity is 144.92 mg/g. The equilibrium time of adsorption process was also studied on lanthanum modified nanocitosan and experimental data showed that the time required to reach equilibrium was 30 min. The kinetic studies of the adsorption process will also be performed on lanthanum modified nanocitosan and the kinetic information obtained will be evaluated by pseudo-first, -second order and intra-particle diffusion kinetic models. Investigation of three kinetic models showed that the adsorption process with a 0.9967 correlation coefficient is in good agreement with pseudo-first kinetic model.

کلیدواژه‌ها [English]

  • Chitosan
  • Lanthanum
  • Phosphate
  • Adsorption
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مواد و فناوری‌های پیشرفته
دوره 9، شماره 2
شهریور 1399
صفحه 9-18
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سابقه مقاله
  • تاریخ دریافت: 02 آبان 1398
  • تاریخ بازنگری: 07 مرداد 1399
  • تاریخ پذیرش: 07 مهر 1399
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