سنتز نانوذرات دی‌اکسید منگنز و ارزیابی عملکرد آن در حذف مس از محلول‌های آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد گروه آب و خاک، دانشگاه صنعتی شاهرود، شاهرود

2 دانشیار گروه آب و خاک، دانشگاه صنعتی شاهرود، شاهرود

3 استادیار پژوهشکده چرخه سوخت، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی، تهران

4 دانشجوی دکترا، دانشکده شیمی، دانشگاه تهران

چکیده

در این پژوهش حذف مس از محلول‌های آبی با استفاده از نانوذرات دی‌اکسید منگنز به‌عنوان جاذب مناسب و جدید مورد بررسی قرار گرفت. به این منظور نانوذرات دی‌اکسید منگنز به‌روش ترسیب الکتروشیمیایی کاتدی سنتز شدند و تأثیر پارامترهای pH، زمان تماس، غلظت جاذب و اثر غلظت اولیه بر فرایند جذب مس در سیستم ناپیوسته مطالعه شد. برای تعیین ویژگی‌های نانوذرات دی‌اکسید منگنز، از میکروسکوپ الکترونی روبشی، دستگاه پراش پرتو ایکس و دستگاه طیف‌سنج مادون قرمز استفاده شد که نتایج حاصل، اندازه متوسط این نانوذرات را بین 30 تا 50 نانومتر نشان داد. نتایج نشان داد که با افزایش pH محلول آبی از 3 تا 7، ظرفیت جذب مس افزایش می‌یابد، به‌طوری که در pH بهینه برابر با 7، میزان جذب با مقدار بیش از 96 درصد، به حداکثر خود رسید. همچنین افزایش زمان تماس و میزان جاذب باعث افزایش راندمان حذف شد و نتایج نشان داد که با افزایش غلظت مس، ظرفیت جذب افزایش می‌یابد. در بررسی ایزوترم‌های جذب، داده‌های آزمایشی مطابقت بیشتری با مدل فروندلیچ با ظرفیت جذب بیش از 169 میلی‌گرم بر گرم نشان دادند. همچنین داده‌های به‌دست آمده برای جاذب نشان داد که جذب مس از مدل سینتیک شبه مرتبه دوم تبعیت می‌کند. به‌طور کلی نتایج این پژوهش نشان داد که استفاده از نانوذرات دی‌اکسید منگنز، یک روش مناسب با پتانسیل بالا در حذف مس از محلول‌های آبی است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Synthesis of Manganese Dioxide Nano-particles (MnO2) and Their Copper Removal Efficiency from Aqueous Solutions

نویسندگان [English]

  • Mehdi Hosseinifard 1
  • Hadi Ghorbani 2
  • mostafa aghazadeh 3
  • Mojtaba Hosseinifard 4
1 Former Graduate Student, Department of Water and Soil, Shahrood University of Technology, Shahrood
2 Assoc. Prof., Department of Water and Soil, Shahrood University of Technology, Shahrood
3 Ass. Prof., Institute of Nuclear Science and Technology, Tehran
4 PhD Student, Faculty of Chemistry, niversity of Tehran, Tehran
چکیده [English]

Removal of copper from aqueous solutions was investigated using manganese dioxide nanoparticles as a new and suitable adsorbent. For this purpose, manganese dioxide nanoparticles were synthesized using the cathode electrochemical deposition method and the effects of pH, contact time, MnO2 concentration, and copper concentration on copper removal efficiency were investigated in a batch system. Scanning electron microscope (SEM), XRD, and FTIR were used to characterize the synthesized manganese dioxide nanoparticles. Results showed that nanoparticle diameters ranged from 30 to 50 nm and that a copper adsorption efficiency of bove 96% percent would be achieved at an optimum pH of 7. It was found that increasing the copper concentration and reducing adsorbent dosage led to enhancements in adsorption capacity but slight reductions in adsorption efficiency. Experimental data also indicated that copper adsorption fitted the Freundlich model with an adsorption capacity of above 169 mg.g‒1 and that it obeyed a pseudo-second order kinetic equation. It was concluded that manganese dioxide nanoparticles may be used as a suitable adsorbent with a high potential for the removal of copper from aqueous solutions.

کلیدواژه‌ها [English]

  • MnO2 Nanoparticles
  • Electrochemical Synthesis of Cathode
  • Copper Removal
  • Aqueous solutions

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مجله آب و فاضلاب
دوره 27، شماره 3 - شماره پیاپی 103
مرداد و شهریور 1395
صفحه 2-11

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