سنتز نانو ذرات آهن صفر(nZVI) و بررسی کارایی آن در حذف آرسنیک از محیط‌های آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار گروه مهندسی بهداشت محیط، مرکز تحقیقات علوم بهداشتی، دانشکده بهداشت، دانشگاه علوم پزشکی همدان

2 عضو هیئت علمی گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی هرمزگان

3 استادیارگروه مهندسی بهداشت محیط ، دانشکده بهداشت ، دانشگاه علوم پزشکی همدان

4 دانش‌آموخته کارشناسی ارشد مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی همدان

چکیده

 
 
هدف از این پژوهش سنتز نانو ذرات آهن صفر و تعیین کارایی آن در حذف آرسنیک از محیط آبی بود. نانوذرات به روش احیای کلرید فریک توسط بوروهیدرید سدیم سنتز گردید و تأثیر تغییرات پارامترهای pH ، زمان ماند، غلظت آرسنیت و آرسنات و غلظت نانو ذرات بر کارایی حذف در سیستم ناپیوسته مورد بررسی قرار گرفت. برای تعیین خصوصیات نانو ذرات آهن تولیدی از میکروسکوپ الکترونی (SEM) و روش XRDاستفاده شد. تصویربرداری از نانو ذرات تولیدی با میکروسکوپ الکترونی نشان داد که این ذرات قطری در مقیاس نانو (100-1 نانومتر) داشتند. نتایج نشان داد که در  pH حدود 7 و با غلظت 1 گرم در لیتر نانو ذرات آهن، می‌توان در زمان ماند 10 دقیقه بیش از 99 درصد آرسنیت و آرسنات را از محیط آبی حذف نمود. همچنین کارایی حذف با افزایش غلظت نانو ذرات آهن و زمان تماس، افزایش و با افزایش غلظت آرسنیک و pH کاهش یافت. نانوذرات آهن دارای مزایایی از قبیل کارایی حذف بالا و زمان واکنش کوتاه است و می‌تواند به‌عنوان یک روش در حذف آرسنیک از محیط‌های آبی استفاده شود.
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Synthesis of Zero Valent Iron Nanoparticles (nZVI) and its Efficiency in Arsenic Removal from Aqueous Solutions

نویسندگان [English]

  • Ali Reza Rahmani 1
  • Hamid Reza Ghafari 2
  • Mohammad Taghi Samadi 3
  • Mansour Zarabi 4
1 Assoc. Prof., Dept. of Environmental Health Eng., Research Center for Health Sciences, School of Public Health, Hamadan University of Medical Sciences, Hamedan
2 Faculty Member of Environmental Health Eng., School of Public Health, Hormozgan University of Medical Sciences
3 Assist. Prof., Dept. of Environmental Health, School of Public Health, Hamadan University of Medical Sciences, Hamedan
4 Grad. Student of Environmental Health Eng., Faculty of Public Health Hamadan University of Medical Sciences, Hamedan
چکیده [English]

The aim of this study to synthesize nanoparticle zero valent iron and to determine its efficiency in arsenic removal from aqueous solutions. Nanoparticles were synthesized by reduction of ferric chloride using sodium borohydrid. The experiments were conducted in a batch system and the effects of pH, contact time, and the concentrations of arsenit, arsenat, and nano zero valent iron were investigated. SEM and XRD were applied for the determination of particle size and characterization of the nanoparticles synthesized. SEM results revealed that synthesized particles were of nano size (1-100 nanometers). At pH=7.0, 99% of arsenit and arsenat was removed when nano zero valent iron concentration was 1 (g L-1)  over a retention time of  10 min. Based on the results obtained, the removal efficiency was enhanced with increasing nano zero valent iron dosage and reaction time, but decreased with increasing initial concentration and initial solution pH. The significant removal efficiency, high rate of process and short reaction time showed that iron nano particles are of a significant potential for the removal of arsenic from aqueous solutions.

کلیدواژه‌ها [English]

  • Nanoparticle
  • Iron
  • ARSENIC
  • Aqueous solution
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