شیمى کاربردى روز

شیمى کاربردى روز

حذف رنگ سمی متیلن بلو از محلول‌های آبی با استفاده از کربن فعال تهیه شده از ضایعات میوه درخت بلوط: مطالعات سینتیکی و ترمودینامیکی

نوع مقاله : مقاله علمی پژوهشی

نویسنده
گروه آموزش شیمی، دانشگاه فرهنگیان، صندوق پستی 889- 14665 تهران، ایران
چکیده
افزایش فعالیت‌های صنعتی و به دنبال آن تخلیه فاضلاب‌های تصفیه نشده حاوی رنگ به پساب‌ها می‌تواند سبب ایجاد مشکلاتی هم چون کاهش قابلیت نفوذ نور، ایجاد شرایط بی هوازی، ایجاد آلرژی، انواع بیماری‌های پوستی و سرطان شود. لذا حذف این رنگ‌ها جهت صیانت از محیط زیست ضروری می‌باشد. در این مطالعه تهیه جاذب کربنی اصلاح شده از ضایعات میوه درخت بلوط و کارایی آن به منظور حذف رنگ سمی متیلن‌بلو از محلول‌های آبی بررسی شده است. روش‌ها: مشخصات جاذب تهیه شده با استفاده از آنالیزهای طیف‌سنجی تبدیل فوریه مادون قرمز (FTIR)، میکروسکوپ الکترونی روبشی (SEM)، اندازه‌گیری میزان تخلخل و سطوح موثر (BET) و پراش انرژی پرتو ایکس (EDX) بررسی و به عنوان یک جاذب موثر برای حذف رنگ سمی متیلن‌بلو از‌ محلول‌های آبی مورد استفاده قرار گرفت. شرایط بهینه با استفاده از 2/2 گرم جاذب، 10 میلی‌گرم بر لیتر رنگ متیلن‌بلو، زمان تماس 56 دقیقه و pH برابر با 8 بدست آمد. مدل‌های ایزوترمی لانگمویر، فروندلیچ و تمکین برای توصیف تعادل جذب رنگ متیلن‌بلو مورد استفاده قرار گرفتند. با توجه به داده های به دست آمده، حداکثر ظرفیت جذب برای جاذب کربنی تهیه شده 57/131 میلی گرم بر گرم بود. داده‌های تعادلی به بهترین وجه توسط مدل لانگمویر توصیف شدند. سینتیک فرآیند با موفقیت با مدل سینتیکی شبه مرتبه دوم تطبیق داده شد. علاوه بر این، پارامترهای ترمودینامیکی نشان می‌دهد که فرایند جذب‌ گرماگیر و خود به خودی می‌باشد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Removal of toxic methylene blue dye from aqueous solutions using activated carbon prepared from oak fruit waste: Kinetic and thermodynamic studies

نویسنده English

frood shojaeipoor
Department of Chemistry Education, Farhangian University, P.O. Box 14665-889, Tehran, Iran
چکیده English

Increasing industrial activities and subsequent discharge of untreated wastewater containing dyes into wastewater can cause problems such as reduced light penetration, anaerobic conditions, allergies, various skin diseases, and cancer. Therefore, removing these dyes is essential to protect the environment. In this study, the preparation of activated carbon prepared from oak fruit waste and its efficiency for removing the toxic dye methylene blue from aqueous solutions were investigated. The characteristics of the prepared adsorbent were investigated using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), porosity and effective surface area (BET) measurements, and energy dispersive X-ray (EDX) and it was used as an effective adsorbent for removing the toxic dye methylene blue from aqueous solutions. The optimal conditions were obtained using 2.2 g of adsorbent, 10 mg/L of methylene blue dye, a contact time of 56 min and a pH of 8. Langmuir, Freundlich and Temkin isotherm models were used to describe the adsorption equilibrium of methylene blue dye. Conclusion: According to the obtained data, the maximum adsorption capacity for the prepared activated carbon was 131.57 mg/g. The equilibrium data were best described by the Langmuir model. The kinetics of the process were successfully fitted with a pseudo-second-order kinetic model. In addition, the thermodynamic parameters indicate that the adsorption process is endothermic and spontaneous.

کلیدواژه‌ها English

Dye
wastewater
carbon adsorbent
oak
methylene blue
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