حسینی فرد, سید مهدی, قربانی, هادی, آقازاده, مصطفی, حسینی فرد, مجتبی. (1395). سنتز نانوذرات دی‌اکسید منگنز و ارزیابی عملکرد آن در حذف مس از محلول‌های آبی. دو ماهنامه علمی- پژوهشی آب و فاضلاب, 27(3), 2-11.
سید مهدی حسینی فرد; هادی قربانی; مصطفی آقازاده; مجتبی حسینی فرد. "سنتز نانوذرات دی‌اکسید منگنز و ارزیابی عملکرد آن در حذف مس از محلول‌های آبی". دو ماهنامه علمی- پژوهشی آب و فاضلاب, 27, 3, 1395, 2-11.
حسینی فرد, سید مهدی, قربانی, هادی, آقازاده, مصطفی, حسینی فرد, مجتبی. (1395). 'سنتز نانوذرات دی‌اکسید منگنز و ارزیابی عملکرد آن در حذف مس از محلول‌های آبی', دو ماهنامه علمی- پژوهشی آب و فاضلاب, 27(3), pp. 2-11.
حسینی فرد, سید مهدی, قربانی, هادی, آقازاده, مصطفی, حسینی فرد, مجتبی. سنتز نانوذرات دی‌اکسید منگنز و ارزیابی عملکرد آن در حذف مس از محلول‌های آبی. دو ماهنامه علمی- پژوهشی آب و فاضلاب, 1395; 27(3): 2-11.
سنتز نانوذرات دی‌اکسید منگنز و ارزیابی عملکرد آن در حذف مس از محلول‌های آبی
1دانش‌آموخته کارشناسی ارشد گروه آب و خاک، دانشگاه صنعتی شاهرود، شاهرود
2دانشیار گروه آب و خاک، دانشگاه صنعتی شاهرود، شاهرود
3استادیار پژوهشکده چرخه سوخت، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی، تهران
4دانشجوی 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.
Synthesis of Manganese Dioxide Nano-particles (MnO2) and Their Copper Removal Efficiency from Aqueous Solutions
نویسندگان [English]
Mehdi Hosseinifard1؛ Hadi Ghorbani2؛ mostafa aghazadeh3؛ Mojtaba Hosseinifard4
1Former Graduate Student, Department of Water and Soil, Shahrood University of Technology, Shahrood
2Assoc. Prof., Department of Water and Soil, Shahrood University of Technology, Shahrood
3Ass. Prof., Institute of Nuclear Science and Technology, Tehran
4PhD 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.
کلیدواژه ها [English]
MnO2 Nanoparticles, Electrochemical Synthesis of Cathode, Copper Removal, Aqueous Solutions
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