حذف سرب‌(II) از محلول‌های آبی به‌وسیله نانوکامپوزیت نیکل اکسید تثبیت شده بر گرافن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد، گروه محیط‌زیست، واحد بندرعباس، دانشگاه آزاد اسلامی، بندرعباس، ایران

2 دانشیار، گروه شیمی، واحد بندرعباس، دانشگاه آزاد اسلامی، بندرعباس، ایران

چکیده

با توجه به خصوصیات سمیّت و آلایندگی جدی محیط‌زیست توسط فلز سنگین سرب، لازم است از ورود این فلز سنگین از طریق پساب‌های صنعتی به منابع آبی و محیط‌زیست جلوگیری به‌عمل آید تا سلامت انسان و اکوسیستم‌ها حفظ شود. بنابراین این پژوهش، با هدف مدیریت حذف سرب از محلول‌های آبی با استفاده از نانوکامپوزیت‌های نیکل اکسید تثبیت شده بر گرافن انجام شد. برای تعیین فاکتورهای مؤثر بر فرایند حذف پارامترهایی مانند مدت زمان تماس (3، 5، 10، 15، 20 و 30 دقیقه)، دوز جاذب (01/0، 02/0، 05/0 و 1/0 گرم)، غلظت اولیه سرب(II) (5، 10، 20، 50، 100، 200، 300، 800 و 1000 میلی‌گرم در لیتر)، pH (2، 4، 5، 6 و7) و دما (25، 40 و 55 درجه سلسیوس) بررسی شد. بر اساس نتایج به‌دست آمده میزان حذف سرب توسط نانوکامپوزیت نیکل اکسید تثبیت شده بر گرافن تحت شرایط بهینه با مدت زمان تماس برابر 20 دقیقه، دوز جاذب 05/0 گرم، غلظت اولیه ppm 5 و دمای 55 درجه سلسیوس بیشترین حذف را نشان می‌دهد. همچنین داده‌های تجربی ایزوترم‌های لانگمیر, فروندلیچ و دوبینین _ رادشکوویچ برای فرایند جذب سطحی انجام شد و نتیجه‌گیری به‌دست آمده از فرایند جذب بیشترین تطابق را با مدل لانگمیر با ظرفیت جذبی بیشینهmg/g  2000 نشان ‌داد. همچنین این پژوهش نشان داد که جذب سرب از نوع واکنش‌های گرماگیر است. نانوکامپوزیت مغناطیسی گرافن/NiO ساخته شده به‌این طریق، واجد منافذ فراوان و مساحت ویژه زیاد (m2/g 5/196) است که آن را به جاذب ایده‌آلی برای حذف یون سرب(II) از محلول آبی تبدیل می‌کند. حداکثر ظرفیت جذب به‌دست آمده از جاذب مذکور mg/g2000 به‌دست آمد که نسبت به دیگر جاذب‌های معمول، مقدار بسیار بیشتری است. از مزایای این روش، می‌توان به ظرفیت جذب بسیار زیاد، سادگی جداسازی جاذب از محلول و مدت زمان سریع تعادل جذب (تا20 دقیقه) اشاره کرد.

کلیدواژه‌ها

عنوان مقاله [English]

Removal of Pb(II) from Aqueous Solutions Using Graphene-Immobilized Nickel Oxide Composites

نویسندگان [English]

  • Saied Kazempour 1
  • Farid Moeinpour 2
1 MSc., Dept. of Environment, Bandar Abbas Branch, Islamic Azad University, Bandar Abbas, Iran
2 Assoc. Prof., Dept. of Chemistry, Bandar Abbas Branch, Islamic Azad University, Bandar Abbas, Iran
چکیده [English]

Considering lead’s toxicity and its characteristics as a serious environmental pollutant, to protect the human population’s health and the ecosystem it is necessary to stop this heavy metal from entering water resources and the environment through industrial wastewater. Therefore, the present study was carried out to manage lead elimination from aqueous solutions using NiO nanocomposites immobilized on graphene. To determine the effective factors in the elimination process, some parameters including contact time (20, 30, 15, 5, 10, 3 min), adsorbent dosage (0.1, 0.05, 0.2, 0.01g), initial concentration of the lead solution (5, 10, 20, 50, 100, 200, 300, 800, 1000 mg/L) and pH (2, 4, 5, 6, 7) were investigated at room temperature, 40 ˚C and 55 ˚C. Based on the results, the amount of lead eliminated by graphene-immobilized nickel oxide nanoparticles reached its maximum value under the optimum conditions of 20 min contact time, 0.05g adsorbent, 5ppm initial concentration, and 55 ˚C temperature. In addition, the experimental data were analyzed using Langmuir, Freundlich, and Dubinin-Radushkevich isotherms of the adsorption process and the results indicated maximum compliance with the Langmuir isotherm, with a maximum adsorption capacity of 2000 mg/g. These findings show that lead absorption is an endothermic reaction. The graphene/NiO magnetic nanocomposite made in this way has many pores and a high specific area (196.5 m2/g), which makes it an ideal adsorbent for removing lead(II) ions from aqueous solution. The maximum absorption capacity obtained from the said adsorbent was 2000 mg/g, which is much higher than other common adsorbents. Among the advantages of this method, we can point out the very high absorption capacity, the simplicity of separating the adsorbent from the solution, and the fast duration of the absorption equilibrium (up to 20 min).

کلیدواژه‌ها [English]

  • Pb(II)
  • Adsorption
  • Nanocomposite
  • Graphene-Immobilized Nickel Oxide Composites
  • Aqueous Solutions

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مجله آب و فاضلاب
دوره 34، شماره 1 - شماره پیاپی 144
فروردین و اردیبهشت 1402
صفحه 124-137

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