حذف یون کادمیم از محلول آبی با استفاده از نانوذرات مغناطیسی نیکل فریت دارای اتصال عرضی با کیتوزان

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد مهندسی محیط زیست، دانشکده محیط زیست، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 استادیار، گروه شیمی، دانشکده علوم پایه، واحد ورامین- پیشوا، دانشگاه آزاد اسلامی، ورامین، ایران

3 استادیار، گروه منابع آب، دانشکده محیط زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

4 دانشیار، گروه شیمی، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد ورامین- پیشوا، ورامین، ایران

10.22093/wwj.2019.118849.2631

چکیده

کادمیم یکی از فلزات سنگین تجزیه‌ناپذیر و بسیار سمّی است که از منابع مختلف وارد محیط‌های آبی می‌شود. دستیابی به ذخایر آب پاک و سالم مستلزم در نظر گرفتن تمهیداتی برای حذف کادمیم از پساب‌ها، پیش از تخلیه در محیط زیست است. در این پژوهش، نانوکامپوزیت مغناطیسی NiFe2O4-CS با واکنش ایجاد اتصال عرضی میان کیتوزان و نانوذرات نیکل فریت (NiFe2O4) با استفاده از گلوتارآلدئید به‌عنوان عامل ایجادکننده اتصال عرضی تهیه شد. ساختار، مورفولوژی، و رفتار مغناطیسی NiFe2O4-CS  با آنالیزهای FTIR، XRD، FE-SEM، EDX، و VSM مشخص شد. ویژگی جذب سطحی یون‌های کادمیم روی کامپوزیت
CS–NiFe2O4 و عوامل مؤثر بر آن نظیر pH، زمان تماس، غلظت اولیه کادمیم، و حضور یون‌های فلزی خارجی به طور کامل بررسی شد. بازده حذف کادمیم با غلظت اولیه 10 میلی‌گرم در لیتر درpH  برابر 7 و زمان 60 دقیقه با NiFe2O4-CS به 95 درصد رسید. چگالی بالای آمین و هیدروکسیل در کیتوزان، تشکیل کی‌لیت با یون‌های کادمیم را تسهیل می‌سازد و بازده فرایند جذب سطحی را افزایش می‌دهد. مدل سینتیکی شبه مرتبه اول، برازش بهتری با داده‌های تجربی جذب داشت و داده‌های تعادلی با همدمای جذبی لانگمیر به خوبی توصیف شدند. نتایج جذب/واجذب نشان داد که NiFe2O4-CS تهیه شده قابلیت استفاده مجدد در فرایند جذب سطحی را دارا است. مطابق نتایج این پژوهش، NiFe2O4-CS  می‌تواند به‌عنوان یک جاذب بالقوه مؤثر در حذف کادمیم از پساب مورد استفاده قرار گیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Removal of Cd (II) Ion from Aqueous Solution Using Nickel Ferrite Magnetic Nanoparticles Cross–Linked Chitosan

نویسندگان [English]

  • Ashraf Homayonfard 1
  • Mahsasadat Miralinaghi 2
  • Reza Haji Seyed Mohammad Shirazi 3
  • Elham Moniri 4
1 Former Graduate Student of Environmental Engineering, Dept. of Environmental Engineering, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Assist. Prof., Dept. of Chemistry, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran
3 Assist. Prof., Dept. of Environmental Engineering, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran
4 Assoc. Prof., Dept. of Chemistry, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran
چکیده [English]

Cadmium is one of the non-biodegradable and extremely toxic heavy metals that enter into the aquatic environment by various sources. In order to provide a safe and clean water supply to the public, there is a crucial need to take some measures to removal of cadmium from wastewaters prior to their disposal in the environment. In the present study, a NiFe2O4-CS magnetic nanocomposite was prepared by a cross–linking reaction of chitosan with nickel ferrite (NiFe2O4) nanoparticles using glutaraldehyde as the cross–linking agent. The structure, morphology, and magnetic behavior of the NiFe2O4-CS were characterized by FTIR, XRD, FE-SEM, EDX, VSM analysis. The adsorption property of Cd (II) onto NiFe2O4-CS composite and the different factors affect the adsorption, such as pH value, contact time, initial Cd (II) concentration, and the presence of foreign metal ions were extensively investigated. The Cd (II) removal efficienciy of 95% was obtained within 60 min at pH 7.0 with initial Cd (II) concentration of 10 mg/L using CS/NiFe2O4. High amine and hydroxyl density of chitosan facilitated the chelation with Cd (II) ions, resulting efficient adsorption. The pseudo-second-order kinetic model provided the best fit to experimental adsorption data and the equilibrium data could be well described by Langmuir adsorption isotherm. Adsorption/desorption results demonstrated that reusability of prepared NiFe2O4-CS was considerable. The results showed that NiFe2O4-CS could employ as an effective and potential adsorbent for application in the removal of Cd (II) from wastewater.

کلیدواژه‌ها [English]

  • Wastewater Treatment
  • Adsorption
  • Magnetic nanocomposite
  • heavy metals

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