مقایسه کارایی نانوذرات آهن صفر ظرفیتی و نانوذرات آهن پایدار شده برای احیای نیترات از آب‌های آلوده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد خاکشناسی، دانشکده کشاورزی، دانشگاه شهید چمران، اهواز، ایران

2 استادیار گروه خاکشناسی، دانشکده کشاورزی، دانشگاه شهید چمران، اهواز، ایران

3 دانشیار گروه خاکشناسی دانشکده کشاورزی، دانشگاه شهید چمران، اهواز، ایران

4 استاد گروه شیمی، دانشکده علوم، دانشگاه شهید چمران اهواز، اهواز، ایران

چکیده

هدفازانجاماینپژوهشامکان‌سنجیکاربردنانوذراتآهنبرایاحیاینیتراتدرمحلول‌هایآبی بود. به این منظور نانوذرات آهن صفرظرفیتی پایدار نشده و نانوذرات پایدار شده با کربوکسی متیل سلولز به‌روش احیا توسط بوروهیدرید سدیم ساخته شد و مورفولوژی آن‌ها به‌وسیله میکروسکوپ الکترونی روبشی، طیف پراش‌نگار اشعه ایکس و دستگاه طیف‌سنج مادون قرمز بررسی شد. تأثیر عوامل مختلف شاملpH  محلول آبی، غلظت اولیه نیترات، غلظت نانوذرات و زمان تماس بر احیای نیترات و سینتیک احیای نیترات بررسی شد. نتایج نشان داد که 93 درصد نیترات توسط نانوذرات پایدار شده در pH برابر 6 و 85 درصد توسط نانوذرات پایدار نشده در pH برابر 2 احیاء شد. افزایش غلظت نانوذرات و زمان تماس، احیای نیترات را افزایش داد اما افزایش غلظت اولیه نیترات، احیای نیترات را کاهش داد. محصول عمده احیای نیترات در pHهای اسیدی، آمونیوم بود اما در pHهای قلیایی نیترات به نیتروژن تبدیل شد و مقدار نیتریت تولیدی کمتر از 2 درصد بود. آزمایش‌های سینتیک نشان داد که احیای نیترات با نانوذرات از معادله درجه اول و دوم تبعیت می‌کند. نتایج این پژوهش نشان داد که نانوذرات آهن صفرظرفیتی پایدار شده نسبت به پایدار نشده توانایی بالایی در احیای نیترات آب‌های آلوده دارند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparison of the Efficiencies of Zero-Valent Iron Nanoparticles and Stabilized Iron Nanoparticles for Nitrate Reduction from Polluted Waters

نویسندگان [English]

  • Fatemeh Nooralivand 1
  • Ahmad Farrokhian Firouzi 2
  • Mostafa Chorom 3
  • Alireza Kiyasat 4
1 MSc Graduate of Soil Sciences, Faculty of Agriculture, Shahid Chamran University, Ahvaz, Iran
2 Ass. Prof. of Soil Sciences, Faculty of Agriculture, Shahid Chamran University, Ahvaz, Iran
3 Assoc. Prof. of Soil Sciences, Faculty of Agriculture, Shahid Chamran University, Ahvaz, Iran
4 Prof. of Chemistry, Faculty of Sciences, Shahid Chamran University, Ahvaz, Iran
چکیده [English]

The present study was conducted to evaluate the feasibility of zero-valent iron nanoparticles (ZVIN) for the removal of nitrate from aqueous solutions. For this purpose, bare zero-valent iron nanoparticles (bare-ZVIN) and CMC-ZVIN were synthesized using the borohydride reduction method and their morphological characteristics were examined via scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier Transmission Infrared Spectroscopy (FTIR). The effects of pH of the aqueous solution, initial nitrate concentration, ZVIN concentration, and contact time on nitrate reduction were investigated as operational parameters and the kinetics of nitrate reduction was studied in batch experiments. The results showed that 93.65% of nitrate was removed by stabilized nanoparticles at pH=6 while non-stabilized nanoparticles at pH=2 were able to remove 85.55% of the nitrate.Furthermore, nitrate reduction was enhanced by increasing ZVIN concentration and contact time while it was decreased as a result of increasing initial nitrate concentration. The major product of nitrate reduction at an acidic pH was found to be ammonium; at an alkaline pH, however, nitrate was converted to nitrogen and nitrite production dropped to less than 2%. Kinetic analysis demonstrated that denitrification of nitrate by the nanoparticles fitted well with first-order and second-order reaction models. The results also demonstrated that the stabilized ZVI nanoparticles were more effective than bare-ZVIN for nitrate reduction in aqueous solutions.

کلیدواژه‌ها [English]

  • Nitrate Reduction
  • carboxymethyl cellulose
  • Aqueous solution
  • Zero-valent Iron Naoparticles

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مجله آب و فاضلاب
دوره 26، شماره 5 - شماره پیاپی 5
پیاپی: 99
آذر 1394
صفحه 56-64

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