بررسی آزمایشگاهی حذف جیوه از محلول‌های آبی با استفاده از جاذب نانولوله کربنی مغناطیسی شده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، گروه مهندسی شیمی، واحد ماهشهر، دانشگاه آزاد اسلامی، ماهشهر، ایران

2 استادیار،گروه مهندسی شیمی، واحد ماهشهر، دانشگاه آزاد اسلامی، ماهشهر، ایران

چکیده

حذف آلودگی‌ها به‌وسیله جاذب، یک روش مفید و مؤثر برای حذف فلزات سنگین از نمونه‌های آبی است. جیوه یکی از انواع فلزات سنگین است که اثرات بسیار مخربی بر سلامت انسان و محیط زیست دارد. این پژوهش با هدف بررسی عملکرد نانولوله کربنی مغناطیسی شده، برای حذف جیوه از محلول‌های آبی انجام شد. از روش سطح پاسخ بر مبنای مدل باکس-بنکن برای ارزیابی اثر متغیرهای مستقل مانند pH محلول، غلظت اولیه جیوه، دز جاذب و زمان تماس بر عملکرد پاسخ (درصد حذف جیوه) استفاده شد. ابتدا نانولوله‌ کربنی مغناطیسی‌شده سنتز شد و مشخصات جاذب به‌وسیله آنالیزهای SEM و FT-IR و XRD بررسی شد، سپس آزمایش‌های جذب بر اساس طراحی آزمایش انجام شد. نتایج حاصل از آنالیز مشخصات جاذب نشان داد که ذرات اکسید آهن به خوبی بر روی نانولوله‌های کربنی چند دیواره نشانده شده‌اند و جاذب خاصیت مغناطیسی پیدا کرده است. نتایج حاصل از انجام آزمایش‌ها توسط نرم‌افزار Design Expert آنالیز و تحلیل شد و مناسب‌ترین مدل برای رسم منحنی‌های سطح پاسخ که روش مرتبه دوم بوده است، مشخص شد. بر اساس نتایج آزمایش‌ها بیشترین راندمان حذف جیوه تحت شرایط pH برابر 6، دز جاذب 6/0 گرم در لیتر، غلظت اولیه جیوه ppm 10 و زمان تماس 150 دقیقه حاصل شد که معادل 85 درصد بود. با تطابق داده‌های آزمایشگاهی با مدل‌های ایزوترم و سینتیک مشخص شد که فرایند جذب از مدل ایزوترم فروندلیچ (99/0<R2) و همچنین مدل سینتیک شبه مرتبه

کلیدواژه‌ها


عنوان مقاله [English]

Experimental Study on Removal of Mercury from Aqueous Solutions by Using Magnetite Carbon Nanotube (CNT) as Adsorbent

نویسندگان [English]

  • Mehdi Hayati 1
  • Somayeh Tourani 2
1 MSc Student of Chemical Engineering, Dept. of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran
2 Assist. Prof., Dept. of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran
چکیده [English]

Removal of contaminants by adsorbent is a useful and effective way to remove heavy metals from wastewater and aqueous samples. Mercury is one of the heavy metals that is toxic to humans, animals and the environment. In this study, magnetic multi-walled carbon nanotube (MMWCNT) composite was synthesized and used to remove Hg(II) from aqueous solutions. This work was conducted on a laboratory scale and based on the design of experiment by the surface response methodology (RSM) and based on Box-Behnken design, and the effects of independent variables including pH, adsorbent dose, initial concentration of Hg and contact time in different levels were evaluated with the help of Design-Expert Stat-Ease Inc software. The properties of this magnetic adsorbent were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The results show that the adsorption of Hg(II) on magnetic MWCNT composite is strongly dependent on contact time and adsorbent dosage. The highest efficiency of removal mercury was about 85% and that occurred when pH=6, dose of adsorbent= 0.6 g/L, initial concentration of Hg(II)=10 ppm and contact time=150 minutes. The adsorption isotherm data were better fitted by Freundlich model, while kinetic data can be characterized by the pseudo-second-order rate kinetics. In general, it can be concluded that magnetic MWCNT adsorbent has a very high ability to remove mercury.

کلیدواژه‌ها [English]

  • Adsorption
  • Mercury
  • Magnetic carbon nanotube
  • Adsorption isotherms
  • Adsorption kinetics
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