نشریه محیط زیست طبیعی

حذف فلز سنگین کروم از محیط های آبی با استفاده از کربن فعال تولید شده از فیلترهای سیگار مصرف شده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکتری مهندسی نساجی، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد علوم تحقیقات، تهران، ایران

2 مدیر گروه پلیمر و نساجی ، دانشکده تحصیلات تکمیلی و رئیس دانشگاه ازاد اسلامی واحد تهران جنوب

3 استاد، گروه نساجی،، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد علوم تحقیقات، تهران، ایران

4 استاد، گروه محیط زیست، دانشکده محیط زیست و منابع طبیعی، دانشگاه آزاد اسلامی واحد علوم تحقیقات، تهران، ایران

5 استاد، گروه نساجی،، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد یزد. یزد

چکیده

امروزه به علت مصرف انبوه سیگار و وجود فیلترهای سیگار به عنوان پسماندی آلوده و غیر قابل تخریب در محیط زیست، اهمیت جمع آوری و تبدیل آنها به یک ماده قابل مصرف امری ضروری است. بنابر این تبدیل ته سیگارها به کربن فعال می تواند به صورت دوگانه برای محیط زیست موثر باشد. از آنجا که آب آشامیدنی سالم فاکتوری حیاتی برای بقا جوامع است، وجود فلز سنگین کروم در آب می تواند بسیار خطرناک باشد. امروزه استفاده از کربن فعال یکی از روشهای متداول برای حذف فلز سنگین کروم از آب است. هدف از این مطالعه کارایی کربن فعال تولید شده از ته سیگارها در حذف کروم شش ظرفیتی از محلول های آبی بود. در این تحقیق از فعال سازی شیمیای توسط NaOH استفاده و برای تعیین میزان سطح مخصوص از آزمون BET و SEM استفاده شد. اثرPH، مقدار جاذب، زمان واکنش، غلظت اولیه کروم و دما جهت حذف کروم بررسی و میزان جذب با استفاده از دستگاه جذب اتمی انجام شد. نتایج نشان داد که پیش عملیات با NaOH و افزایش غلظت آن منجر به افزایش سطح مخصوص کربن های فعال شد . آزمایشات جذب نشان داد که بالاترین راندمان جذب در pH 2، میزان جاذبg/l 7، زمانmin 60 ، غلظت اولیه کرومmg/l 50 و دمای0C 25 مشاهده شد. نتایج نشان داد که جذب از ایزوترم لانگمویر تبعیت می کنند و معادله شبه مرتبه اول مناسب برای داده های آزمایش می باشد. بررسی ترمودینامیک جذب نشان داد که واکنش خود به خودی و گرمازا است. این تحقیق نشان داد که الیاف استات سلولز در فیلتر سیگار می تواند ماده ای مناسب در عملیات کربونیزاسیون جهت تهیه کربن فعال با سطح مخصوص در حدود m2/g 1000 شود که جهت حذف کروم از آب می تواند مصرف شود است.

کلیدواژه‌ها

عنوان مقاله [English]

Removal of chromium from aqueous solutions by activated carbon produced of cigarette butts

نویسندگان [English]

  • bahareh koochaki chenani 1
  • ramin khajavi 2
  • aboo saeed rashidi 3
  • nabiallah mansouri 4
  • mohamad esmail yazdanshenas 5

1 1 Department of Textile and polymer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 department of polymer & textile engineering, south Tehran branch. Islamic Azad university

3 Department of Environmental Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

4 Department of Environmental Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

5 Department of Textile Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran

چکیده [English]

Today, due to the extensive consumption of cigarettes and the presence of cigarette butts in the environment as non-degenerative waste, collecting and converting them into a consumable is essential. Therefore, converting cigarette butts to activated carbon can be a win-win strategy for the environment. Because safe drinking water is a vital factor in the survival of communities, the presence of chromium, as a heavy metal, in the water can be very dangerous. Today, the use of activated carbon is one of the most common methods for removing chromium from water. The present study aimed at determination of the effectiveness of activated carbon produced by cigarette butts in removing hexavalent chromium from aqueous solutions. In this study, NaOH chemical activation was utilized and BET and SEM tests were used to determine the specific area. The effect of pH, adsorption value, reaction time, initial chromium concentration and temperature for chromium removal were investigated and the adsorption rate was determined using atomic adsorption device. The results showed that pre-treatment with NaOH and increasing its concentration led to an increase in the specific surface area of activated carbon. Absorption tests showed that the highest adsorption efficiency was observed at pH 2, 7 g/l of adsorbent, time of 60 min, initial chromium concentration of 50 mg/l and temperature of 25°C. The results showed that adsorption followed the Langmuir isotherm, and the quasi-first order equation is suitable for experimental data. The thermodynamic analysis of the adsorbent showed that the reaction is spontaneous and exothermal. This study showed that cellulose acetate fibers in cigarette filters can be a suitable material in carbonization operations to produce activated carbon with a specific surface area of about 1000 m2/g, which can be used to remove chromium from water.

کلیدواژه‌ها [English]

  • Cigarette butts
  • activated carbon
  • chromium
  • adsorption
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نشریه محیط زیست طبیعی
دوره 73، شماره 4
اسفند 1399
صفحه 791-804