پالایش سرب از محلول های آبی با استفاده از نانوذرات دی اکسیدمنگنز سنتز شده به روش الکتروشیمیایی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 گروه آب و خاک، دانشگاه صنعتی شاهرود، شاهرود

2 پژوهشکده چرخه سوخت، پژوهشگاه علوم و فنون هسته ای، سازمان انرژی اتمی، تهران

3 دانشکده شیمی، دانشگاه تهران، تهران

چکیده

هدف از این پژوهش سنتز نانو ذرات دی اکسید منگنز (MnO2) و تعیین کارآیی آن در حذف سرب از محلول های آبی بود. به این منظور نانو ذرات دی اکسیدمنگنز به روش الکتروشیمیایی کاتدی سنتز گردید و تاثیر پارامترهایpH، زمان تماس، مقادیر جاذب و اثر غلظت اولیه بر فرآیند جذب سرب در سیستم ناپیوسته مورد بررسی قرار گرفت. ایزوترم های جذب لانگمیر و فرندلیچ و همچنین سینتیک های جذب سرب بر روی جاذب نانو ذرات دی اکسید منگنز بر اساس مدل های هو و همکاران و لاگرگرن بررسی شد. جهت مشخصه یابی و بررسی مورفولوژیکی نانو ذرات دی اکسید منگنز (MnO2) از میکروسکوپ الکترونی روبشی(SEM)، دستگاه پراش نگار اشعه ایکس(XRD) و طیف سنج مادون قرمز(FTIR) استفاده گردید. تصاویر تولیدی با میکروسکوپ الکترونی روبشی نشان داد که اندازه این ذرات 30 تا 50 نانومتر است. نتایج نشان داد که با افزایش pH محلول آبی از 3 تا 6، درصد و ظرفیت جذب سرب افزایش می یابد، به طوری که در pH برابر با 6 میزان جذب به حداکثر خود رسید ولی در pH برابر 7 کاهش یافت. لذا pH بهینه برای حذف سرب با استفاده از نانو ذرات دی اکسید منگنز برابر با 6 بدست آمد. افزایش زمان تماس باعث افزایش راندمان حذف شد. نتایج نشان داد که با افزایش غلظت یونهای سرب ظرفیت جذب افزایش ولی راندمان جذب کاهش می یابد. به طور کلی نتایج این مطالعه نشان داد که استفاده از نانوذرات دی اکسیدمنگنز به عنوان یک روش مناسب باپتانسیل بالا درحذف سرب از محلولهای آبی است.

کلیدواژه‌ها


عنوان مقاله [English]

Removal of lead from aqueous solutions using manganese dioxide nanoparticles synthesized by electrochemical method

نویسندگان [English]

  • Mehdi Hosseinifard 1
  • Hadi Ghorbani 1
  • Mustafa Aghazadeh 2
  • Mojtaba Hosseinifard 3
1 Department of Water and Soil, Shahrood University of Technology, Shahrood
2 Institute of Nuclear Science and Technology, Tehran
3 Faculty of Chemistry, University of Tehran, Tehran
چکیده [English]

The objectives of this research were to synthesis Manganese dioxide nanoparticles and determining its efficiency in the removal of lead from aqueous solutions. Consequently, Manganese dioxide nanoparticles were synthesized cathode electrochemical deposition method and the effect of pH, contact time, Lead concentration and nanoparticles amount on Lead removal efficiency were investigated in batch system. Scanning Electron Microscope (SEM), XRD and FTIR were used to characterization of the synthesized Manganese dioxide nanoparticles. SEM results showed that the diameter of the particles is 30-50 nm. Results also showed that the optimum pH value for adsorption was 6.The adsorption capacity increased and the adsorption efficiency decreased with increasing concentration of Lead ions and reducing the amount of adsorbent. In a study of the adsorption isotherm, experimental data from the Langmuir model to follow. The data obtained in this study showed that the absorption of lead absorption kinetics model obeys Hu et al. The overall results of this study showed that the use of manganese dioxide .nanoparticles as a suitable method whit high potential for the removal of lead from aqueous solutions

کلیدواژه‌ها [English]

  • Removal of Lead
  • Manganese Dioxide Nanoparticles
  • Electrochemical Synthesis
  • Aqueous Solutions
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