مطالعه حذف سرب از آب‌های آلوده با استفاده از انواع جاذب‌های تهیه شده از ساقه کلزا

نویسندگان

1 دانشجوی دکترای علوم و مهندسی آب، دانشگاه صنعتی اصفهان

2 استاد گروه علوم و مهندسی آب دانشگاه صنعتی اصفهان

3 دانشیار گروه خاکشناسی دانشگاه صنعتی اصفهان

چکیده

به دلیل ایجاد آلودگی در طبیعت توسط فلز سرب، برای حذف این فلز سنگین از محلول‌های آلوده شبیه‌سازی شده در آزمایشگاه، از جاذب خام تهیه شده از ساقه کلزا و جاذب بیوچار فعال­سازی شده با بخار آب استفاده شد؛ به اینصورت که جاذب بیوچار فعال­سازی شده با بخار آب، در دمای کربن‌سازی 500 درجه سلسیوس و دمای فعال­سازی 700 درجه سلسیوس تهیه شد و آزمایش‌های ایزوترم جذب سرب در دمای 25 درجه سلسیوس، صورت گرفت. سپس آزمایش‌های انتخاب بهترین pH جاذب و بهترین مقدار جاذب انجام گرفت. در ادامه، هر دو جاذب خام و بیوچار با نانوذرات اکسید آهن مغناطیسی (Fe3O4) در سطح 5% اصلاح شدند و آزمایش‌های ایزوترم جذب سرب با استفاده از جاذب‌های جدید نیز انجام گردید. نتایج نشان داد که جاذب بیوچار فعال­سازی شده با بخار آب اصلاح شده با نانوذرات اکسید آهن مغناطیسی (BC-5%) به عنوان بهترین جاذب برای از حذف آلاینده سرب، می‌باشد. در جاذب مذکور، حداکثر میزان آلاینده جذب شده روی جاذب برابر 62/63 میلی‌گرم بر گرم، پارامتر ثابت جذب لانگمویر برابر 06790/0 لیتر بر میلی‌گرم، ضریب تبیین برابر 9798/0 و خطای استاندارد  برابر 219/3 به دست آمد.

کلیدواژه‌ها

عنوان مقاله [English]

Study of Lead Removal from Polluted Water by Types of Adsorbents Made from the Canola Stalk

نویسندگان [English]

  • Abdullah Ranjbar 1
  • Manouchehr Heidarpour 2
  • Saeid Eslamian 2
  • Mehran Shirvani 3
1 Department of Water Engineering, College of Agriculture, Isfahan University of Technology
2 Professor, Department of Water Engineering, College of Agriculture, Isfahan University of Technology
3 Associate Professor, Soil Science Department, College of Agriculture, Isfahan University of Technology
چکیده [English]

Due to pollution in nature by lead (Pb), the canola stalk (CS) and water vapor-activated biochar (BC) adsorbents were utilized to remove lead from polluted solutions in the lab. The water vapor-activated biochar adsorbent was prepared in 500-degree Celsius carbonization temperature and 700-degree Celsius activation temperature. Lead adsorption isotherm experiments were carried out in 25 degrees Celsius. Experiments were performed to determine the best adsorbent pH level and the best adsorbent dosage level. Both CS and BC adsorbents were amended with magnetic iron oxide nanoparticles (Fe3O4) at 5% (w/w), and the lead adsorption isotherm experiments were carried out using the new adsorbents. The results indicated that the water vapor-activated biochar adsorbent modified with Fe3O4 (BC-5%) is the best adsorbent for the lead pollutants removal. In this adsorbent, the maximum of adsorbed quantity was found equal to 63.62 mg g-1, the Langmuir constant was obtained equal to 0.06790 L mg-1, coefficient of determination was computed equal to 0.9798 and standard error of the estimate acquired equal to 3.219.

کلیدواژه‌ها [English]

  • Adsorbent
  • Adsorption isotherm
  • Biochar
  • Lead
  • Nanoparticles

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دانش آب و خاک
دوره 33، شماره 1
فروردین 1402
صفحه 17-31

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