سنتز کیتوسان مغناطیسی شبکه‌ای شده برای حذف مقادیر کم برخی فلزات سنگین از محلول‌های آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه آزاد اسلامی واحد ورامین(پیشوا)، ایران، صندوق پستی: 74895-33817

چکیده

مقادیر کم مس (II) و سرب (II) با استفاده از یک نانوجاذب زیستی جدید براساس دانه‌های مغناطیسی کیتوسان شبکه‌ای شده اصلاح شده با پایه متیونین-گلوتارآلدهید شیف باز(MG-Chi/Fe3O4)  در نمونه‌های فاضلاب حذف شدند. طیف تبدیل فوریه زیر قرمز (FTIR)، پراش پرتو ایکس(XRD)  و میکروسکوپ الکترونی روبشی(SEM)  برای شناسایی نانو بیو ذرات استفاده شدند. عوامل مختلف مؤثر بر رفتارهای جذب یون‌های فلزی از جمله pH، مقدار جاذب، زمان تماس و غلظت اولیه یون‌های فلزی مورد بررسی و بهینه‌سازی قرار گرفتند. برای پیش‌بینی مدل جذب از مدل‌های ایزوترم فروندلیچ و لانگمویر استفاده شد. داده‌های تعادل با مدل ایزوترم لانگمویر به خوبی متناسب بودند. بیشینه ظرفیت جذب برای مس (II) و سرب (II) به ترتیب 172.4 و 175.4 میلی گرم در گرم بود. سینتیک جذب با مدل شبه مرتبه دوم مطابقت بهتری داشت. سرانجام این روش برای حذف هم‌زمان مس (II) و سرب (II) در نمونه‌های فاضلاب صنعتی با موفقیت استفاده شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Synthesis of Crosslinked Magnetic Chitosan to Removal of Trace Amounts of Some Heavy Metals from Aqueous Solutions

نویسندگان [English]

  • N. Salehi
  • A. Moghimi
Department of Chemistry, Varamin (Pishva) Branch, Islamic Azad University, P.O. Box: 33817-74895, Varamin, Iran
چکیده [English]

Trace amounts of Cu (II) and Pb (II) in the wastewater sample were removed with a new nano biosorbent based on cross-linked chitosan magnetic beads modified with methionine-glutaraldehyde Schiff's base (MG-Chi/Fe3O4) in wastewater samples. Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD) analysis, and scanning electron microscope (SEM) have been applied to characterize nano biosorbent. Various parameters affecting the uptake behavior of the metal ions were examined and optimized, including pH, adsorbent dose, contact time, and initial concentration. Freundlich and Langmuir isotherm models were applied to estimate adsorption mode. The equilibrium data were well fitted with the Langmuir isotherm model. The maximum adsorption capacities for Cu (II) and Pb (II) were 172.4 and 175.4 mg g-1, respectively. The adsorption kinetics are better consistent with the pseudo-second-order model. It was concluded that this method was successfully applied for the simultaneous removal of Cu (II) and Pb (II) in industrial wastewater samples.

کلیدواژه‌ها [English]

  • Magnetic chitosan
  • Removal of metal ions
  • Cross-linking
  • Adsorbance
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