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 زیست­دوست نانوکیتوسان، از طریق ژل شدن یونی، سنتز و جهت بهبود کارایی و عملکرد، با لانتانیوم، اصلاح گردید. برای شناسایی جاذب­های سنتز شده، از روش­های 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، مدل­های 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 می­کند. بیشینه ظرفیت جذب، 92/144 میلی­گرم برگرم است. همچنین، 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

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