نشریه محیط زیست طبیعی

نانو کامپوزیت کیتوسان مغناطیسی اصلاح شده با زانتات: راهکاری نوین و پایدار برای جذب جیوه (II) از محلول آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم پایه، دانشکدة گیاهان دارویی، دانشگاه تخصصی فناوری‌های نوین آمل، آمل، ایران.

2 گروه محیط‌ زیست، دانشکدة محیط‌زیست، دانشگاه تهران، تهران، ایران.

3 گروه مهندسی فضای سبز، دانشکدة جغرافیا و برنامه‌ریزی محیطی، دانشگاه سیستان و بلوچستان، زاهدان، ایران.

10.22059/jne.2025.394731.2803

چکیده

جیوه یکی از خطرناکترین عناصر در محیط آبی است که از منابع مختلف وارد آن می­شود. بنابراین هدف از این مطالعه حذف (II) Hg از محلول آبی با سنتز نانو کامپوزیت کیتوسان مغناطیسی اصلاح شده با گروه عاملی زانتات است. به‌منظور تشخیص و بررسی ویژگی­ های نانو کامپوزیت سنتز شده آنالیزهایFTIR ،VSM ، XRD و SEM انجام شد. جذب جیوه با استفاده از جاذب در سیستم ناپیوسته انجام شد و پارامترهای جذبی نظیر pH، زمان تماس، مقدار جاذب، غلظت اولیة یون جیوه و دما  مورد بررسی قرار گرفتند. برای اندازه­گیری غلظت یون جیوه از دستگاه جذب اتمی استفاده شد. براساس نتایج آزمایش‌ها، شرایط بهینة جذب در pH=7 ، 0/2 گرم در لیتر جاذب، غلظت اولیة یون جیوه 50 میلی­گرم بر لیتر و زمان تماس90 دقیقه انتخاب شد. در برازش داده ­ها با مدل ­های هم‌دمای لانگمویر و فرندلیخ، مشخص شد که مدل لانگمویر برازش بهتری (0/99 =R2) نسبت به مدل فرندلیخ (0/86 =R2) ارائه می­دهد. بیشینة ظرفیت جذب (qm) به‌دست آمده با مدل لانگمویر 332 میلی‌گرم بر گرم بود. نتایج سینتیک جذب نشان داد که فرآیند جذب از مدل سینتیکی شبه مرتبه دوم پیروی می­کند. نتایج ترمودینامیک نشان داد که فرآیند جذب یک فرآیند خودبه‌خودی و گرماده بوده و جاذب سنتز شده طی پنج چرخة متوالی توسط اسید کلریدریک 0/5 مولار بازیابی شد. همچنین درصد بازیابی یون­ جیوه برای 5 چرخة جذب و بازجذب تنها حدود 7% کاهش داشته است. نتایج نشان داد جاذب سنتز شده از ظرفیت جذب بالایی برخوردار بوده و قابلیت بازیابی و استفادة مجدد این جاذب پایدار بکارگیری آن را در سیستم تصفیة پساب از نظر اقتصادی توجیه می­کند.

کلیدواژه‌ها

عنوان مقاله [English]

Xathate modified magnetic chitosan nanocomposite: a novel and sustainable approach for the adsorption of mercury (II) from aqueous solution

نویسندگان [English]

  • Seyed Mehdi Hosseini 1
  • Robabeh Vajdi 2
  • Sanaz Khammar 3

1 Department of Basic Sciences, Faculty of Medicinal Plants, Amol University of Special Modern Technologies, Amol, Iran.

2 Department of Environmental Sciences, Faculty of Environment, University of Tehran, Tehran, Iran.

3 Department of Landscape Design Engineering, Faculty of Geography and Environmental Planning, University of Sistan and Baluchestan, Zahedan, Iran.

چکیده [English]

Hg (II) is considered as one of the most dangerous elements being released excessively into the aqueous environment from various sources. Therefore, the aim of this study is the removal of Hg (II) from aqueous solution by synthesizing a Xanthate Modified magnetic chitosan nanocomposite. Synthesized nanocomposite was characterized by FTIR, VSM, XRD and SEM. The adsorbent was tested by a batch system for Hg (II) adsorption and the effect of various parameters, such as pH, contact time, adsorbent dosage, the initial concentration of mercury and temperature were investigated. The concentration of Hg (II) was determined by an atomic adsorption spectrometer. The optimum condition of mercury removal was observed at pH=7, adsorbent dosage of 0/2 g L-1, the initial Hg (II) concentration of 50 mg L-1 and contact time of 90 minutes. The data fitted by Langmuir isotherm model (R2=0.99) better than Freundlich model (R2=0.86). The obtained maximum adsorption capacity (qm) by Langmuir model was 332 mg g-1. The results of kinetic studies showed that the adsorption process followed by pseudo-second-order kinetic model. The results of thermodynamics showed that the adsorption process was exothermic and spontaneous. Desorption study showed that adsorbed mercury could easily be desorbed from the adsorbent using 0/5 mol L-1 HCl. Reusability of adsorbent was investigated up to five cycles and desorption percentage of mercury ions decreased only about 7%. The result showed that the synthesized nanocomposite has a relatively high adsorption capacity for mercury adsorption, also according to recyclability and reusability, the application of this sustainable adsorbent in wastewater treatment system could be reasonable in terms of the economic aspect.

کلیدواژه‌ها [English]

  • Sustainable adsorbent
  • Mercury
  • Magnetic chitosan
  • Nanocomposite
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نشریه محیط زیست طبیعی
دوره 78، شماره 1
خرداد 1404
صفحه 125-139