نوع مقاله : Research Paper
نویسندگان
1 مهندسی بهداشت محیط- دانشکده عبوم پزشکی تربت جام- تربت جام- ایران
2 مهندسی بهداشت محیط، دانشکده علوم پزشکی لارستان
چکیده
زمینه و هدف: در سال های اخیر آزاد سازی آلاینده های پایدار از تصفیه خانه فاضلاب به محیط زیست منجر به مشکلات سلامتی و اکوسیستمی شده است. از اینرو هدف از مطالعه حاضر فعال سازی هتروژنی پراکسی مونوسولفات (PMS) با نانوذرات مگنتیک (Fe3O4) برای تجزیه راکتیو بلک 5 (RB5) می باشد.
مواد و روش ها: مطالعه حاضر در مقایسه آزمایشگاهی و ستونی برای تجزیه رنگ RB5 بوسیله فعال سازی PMS با نانوذرات Fe3O4 انجام شد. تاثیر پارامترها همچون pH ( 3-11)، غلظت PMS (4- 25/0 میلی مولار)، غلظت کاتالیست (500- 50 میلی گرم بر لیتر) و دمای محلول (°C 50-10) روی بازدهی تجزیه مورد بررسی قرار گرفت. آزمایشات پایداری و محدود کنندگی گونه های واکنش پذیر در شرایط بهینه بدست آمده از تاثیر پارامترها مورد مطالعه قرار گرفت.
یافته ها: حداکثر بازدهی حذف (% 86/94) در 250 میلی گرم بر لیتر Fe3O4، 2 میلی مولار PMS، pH 7 و زمان واکنش 60 دقیقه بدست آمد. در آزمایشات مقایسه ای Fe3O4 فعالیت کاتالیتیک مناسبی در فعال سازی PMS و تجزیه RB5 نسبت به فرآیند به تنهایی PMS و جذب نشان داد. نرخ تجزیه با افزایش دما بهبود یافت، اما با حضور آنیونها در محلول های آبی به دلیل مصرف گونه های واکنش پذیر کاهش یافت. نانوذرات مگنتیک فعالیت کاتالیتیکی عالی در طی چهار سیکل تجزیه متوالی زمانی در یک راکتور ستونی نشان دادند. آزمایشات مهار کنندگی تاکید کرد که هر دو رادیکال هیدروکسیل و سولفات نقش مهمی در تجزیه آلاینده ایفا می کنند، با اینحال رادیکال سولفات یک گونه غالب تجزیه می باشد. راکتور ستون مداوم بازدهی تجزیه %65/95، 80% و 50% برای RB5 به ترتیب در نمونه سنتتیک، آب سطحی و فاضلاب نساجی فراهم آورد.
نتیجه گیری: برپایه نتایج، می توان نتیجه گیری کرد که فرآیند PMS/Fe3O4 یک تکنولوژی امیدوار کننده برای تجزیه RB5 از محلول های آبی می باشد.
کلیدواژهها
عنوان مقاله [English]
Evaluation of the efficiency of proxymonosulfate activated with Fe3O4 nanoparticles in the degradation of reactive Black 5 dye from aqueous solutions
نویسندگان [English]
- Mohsen Rezaei 1
- Nezamaddin Mengelizadeh 2
1 Department of Environmental Health, Torbat Jam Faculty of Medical Sciences, Torbat Jam, Iran
2 Department of Environmental Health Engineering, Larestan University of Medical Sciences
چکیده [English]
Background and purpose: In recent years, the release of persistent pollutants from wastewater treatment plants into the environment has led to health and ecosystem problems. Therefore, the aim of the present study was to activate heterogeneous peroxymonosulfate (PMS) with magnetic nanoparticles (Fe3O4) for the degradation of reactive black 5 (RB5).
Materials and Methods: The present study was performed in a laboratory and column scale for RB5 dye degradation by PMS activation with Fe3O4 nanoparticles. The effect of parameters such as pH (3-11), PMS concentration (0.25-4 mM), catalyst concentration (50-500 mg/L), and solution temperature (10-50 °C) on the degradation efficiency of RB5 was investigated. Stability experiments and trapping of reactive species were studied under optimal conditions obtained from the influence of parameters.
Results: Maximum dye removal efficiency (94.86%) was obtained in Fe3O4 dosage of 250 mg/L, PMS dosage of 2 mM, pH of 7, and reaction time of 60 min. In comparative experiments, Fe3O4 showed appropriate catalytic activity in PMS activation and RB5 degradation compared to the PMS process and adsorption alone. The degradation rate of RB5 improved with increasing temperature but decreased with the presence of anions in aqueous solutions due to the consumption of reactive species. Highly reactive magnetic nanoparticles showed four consecutive degradation cycles in a column reactor. Trapping experiments emphasize that both hydroxyl radicals and sulfate play an important role in the degradation of pollutants, however, sulfate radicals are a predominant species of RB5 degradation. The continuous column reactor provided 95.65%, 80%, and 50% degradation efficiencies for RB5 in synthetic, surface water, and textile wastewater samples, respectively.
Conclusion: Based on the results, it can be concluded that the PMS/Fe3O4 process is a promising technology for the degradation of RB5 from aqueous solutions.
کلیدواژهها [English]
- Peroxymonosulfate
- Fe3O4
- Reactive Black 5
- Column reactor
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