حذف نیترات از آبهای آلوده با استفاده از نانوذرات نی اصلاح شده

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه

2 استاد گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران، اهواز

3 دانشیار گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران، اهواز

4 دانشیار، دانشکده بهداشت، مرکز تحقیقات فناوری‌های زیست محیطی، دانشگاه علوم پزشکی جندی شاپور، اهواز

5 استاد گروه مهندسی آب، دانشکده کشاورزی، دانشگاه صنعتی اصفهان

6 استادیار گروه آبخیزداری، دانشکده کشاورزی، دانشگاه گنبد کاووس

چکیده

 در این تحقیق نانو ذرات نی توسط محلولهای اپی کلروهیدرین، تری‌اتیل آمین، متانول و پیریدین اصلاح گردید. سپس نانو جاذب اصلاح شده به‌منظور حذف نیترات از آبهای آلوده با استفاده از آزمایش‌های جذب ناپیوسته و پیوسته مورد بررسی قرار گرفت. در آزمایش‌های ناپیوسته اثر عواملی مانند pH ، جرم جاذب و غلظت نیترات اولیه بر جذب نیترات بررسی گردید. نتایج آزمایش‌ها نشان داد که با افزایش pH محلول از2 تا 10، راندمان حذف از 60 تا 86 درصد افزایش یافت و درpH برابر 6 به حداکثر مقدار خود رسید. زمان تعادل برابر2 ساعت به‌دست آمد. با افزایش غلظت نیترات اولیه از 5 تا 120 میلی‌گرم در لیتر، راندمان جذب از 90 به 67 درصد کاهش یافت. با افزایش جرم جاذب از 0/1 تا 0/3 گرم، راندمان حذف از 54 تا 68 درصد افزایش یافت، اما با افزایش از 0/3 گرم تا 1 گرم، راندمان جذب ثابت ماند. فرایند جذب از مدل سینتیک مرتبه دوم (R2 برابر 1) تبعیت کرده و داده‌های جذب با ایزوترم لانگمیر (R2 برابر 0/99) مطابقت بیشتری داشت. آزمایش‌های پیوسته با استفاده از ستون با بستر ثابت (قطر داخلی 2/8 سانتی‌متر و 35 سانتی‌متر ارتفاع ستون) انجام گرفت. با استفاده از آب شبیه‌سازی شده با غلظتهای 15، 50 و 120 میلی‌گرم در لیتر برای دو دبی 0/98 و 2/27 لیتر در ساعت، ظرفیت ستون جذب (qed) به‌ترتیب برابر 13/36، 28/48 و 36/52 میلی‌گرم بر گرم و 25/21، 60/93 و 74/32 میلی‌گرم بر گرم به‌دست آمد. نتایج این مطالعه نشان داد که نانو جاذب نی اصلاح شده قابلیت بالایی در حذف یون‌های نیترات از آبهای آلوده دارد.  

کلیدواژه‌ها


عنوان مقاله [English]

Nitrate Removal from Contaminated Waters by Using Anion Exchanger Phragmites Australis Nanoparticles

نویسندگان [English]

  • Masoomeh Farasati 1
  • Saeed Boroomand Nasab 2
  • Hadi Moazed 3
  • Nematollah Jafarzadeh Haghighifard 4
  • Jahangir Abedi Koupai 5
  • Morteza Seyedian 6
1 Assist. Prof. of Water Eng., College of Agriculture, Razi University, Kermanshah (Corresponding Author) (+98 831) 8323727 Farasati2760@gmail.com
2 Prof. of Irrigation and Drainage, Dept. of Water Sciences Eng., Shahid Chamran University, Ahvaz
3 Assoc. Prof. of Irrigation and Drainage, Dept. of Water Sciences Eng., Shahid Chamran University, Ahvaz
4 Assoc. Prof. Faculty of Public Health, Environmental Technology Research Center, Jondi Shahpur University of Medical Sciences, Ahvaz
5 Prof. of Water Eng., College of Agriculture, Isfahan University of Technology
6 Assist. Prof. of Watershed Management, College of Agriculture, Gonbad Kavoos University
چکیده [English]

The efficiency of modified Phragmites australis nanoparticles for nitrate removal from aqueous solution in batch and continuous conditions was studied. The effect of different operating conditions such as pH, the amount of adsorbent, and initial nitrate concentration were surveyed. Our results showed that, pH 6 could provide better condition for nitrate removal. The increase in the nitrate concentration from 5 to 120mg L-1 reduced the efficiency from 90% to 67%. Kinetics and isotherm data revealed that the nitrate adsorption successfully can be described by pseudo-second order kinetic model (R2 =1) and Longmuir isotherm (R2 =0.99), respectively. At the continuous-flow mode, column were operated at 0.98 L hr-1 and 2.27 L hr-1 with initial nitrate concentration of 15, 50 and 120 mg L-1. At the above mentioned conditions, the adsorption capacities were 13.4, 28.5 and 36.5 mg g -1 at 0.98 L hr-1 and 25.2, 60.9 and 74.3 mg g-1 at 2.27 L hr-1,  respectively.

کلیدواژه‌ها [English]

  • Nitrate removal
  • Phragmites Australis Nano Particles
  • Contaminated Waters
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