بررسی حذف سولفات با استفاده از گل قرمز فعال از محلول‌های آبی: مطالعه سینتیک، ایزوترم و ترمودینامیک جذب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران و محیطزیست ، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران، ایران

2 دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران، ایران

چکیده

در این تحقیق، فرآیند جذب سولفات به کمک گل قرمز فعال در یک سیستم ناپیوسته و به روش تک فاکتوریل (OFAT) مورد بررسی قرار گرفت. خصوصیات جاذب و صحت فرایند فعال­سازی به کمک آنالیز‌های میکروسکوپ الکترونی روبشی (SEM)، سطح ویژه BET، پراش اشعه ایکس(XRD) و XRF  بررسی و تایید شد. فرآیند جذب سولفات در حجم 200 میلی‌لیتر و دور همزن rpm 150 انجام شد. شرایط بهینه جذب برای جاذب در مدت زمان تعادلی 90 دقیقه، غلظت اولیه 100 میلی­گرم بر لیتر، 4 = pH، دمای °C 65 و مقدار جاذب g/L 5/7 به‌دستبه‌دست آمد. راندمان حذف سولفات در شرایط بهینه 1/73 درصد به‌دستبه‌دست آمد. مطالعات ترمودینامیکی جذب نشان داد که  فرآیند جذب در تمامی دماهای بررسی شده به صورت کاملا خود به خودی انجام شد. سینتیک جذب سولفات بر روی سطوح گل قرمز فعال از معادله شبه درجه دوم پیروی کرد.  ایزوترم جذب به خوبی و با ضریب تشخیص 994/0 بر معادله ایزوترمی لانگمویر منطبق شد و ظرفیت جذب حداکثری آن طبق ایزوترم لانگمویر 07/13 میلی­گرم سولفات بر گرم جاذب به‌دست آمد. نتایج حاصل شده از این تحقیق نشان داد که جاذب فعال شده با توجه به هزینه پایین ماده اولیه و مقدار ظرفیت جذب مورد قبول آن می‌تواند به عنوان جاذب ‌کم‌هزینه مورد توجه قرار گیرد.
 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Sulfate Removal from Water Using Activated Red Mud: Kinetic, Isotherm and Thermodynamic Studies

نویسندگان [English]

  • Alireza Arhami Dolat Abad 1
  • Hossein Ganjidoust 2
1 Tarbiat Modares University, Civil and Environmental Engineering Faculty, Tehran, Iran
چکیده [English]

In this study, the absorption of sulfates on activated aluminum industry waste (red mud) has been investigated in a batch system by the OFAT method. The properties of the absorbent were analyzed using a scanning electron microscope (SEM), BET surface area, X-ray diffraction (XRD), XRF. The process of sulfate absorption was done in a volume of 200 mL and a mixer speed of 150 rpm. The optimum absorption conditions were derived in an equilibrium time of 90 minutes, initial concentration of 100 ppm, pH=4, the temperature of 65 ◦C, and 7.5 g/L doses of the absorbent. The efficiency of sulfate removal was 73.1 percent at the optimum conditions. Thermodynamic analysis of absorption showed that the absorption process at all analyzed temperatures had occurred spontaneously. Sulfate absorption kinetics on composite surfaces followed a pseudo second-order equation and absorption isotherm had high conformity with Langmuir isotherm (r=0.994) and the maximum absorption capacity of it according to Langmuir isotherm is 13.07 mg of sulfate per gram of the absorbent.

کلیدواژه‌ها [English]

  • Adsorption
  • red mud
  • Activated red mud
  • sulfate
  • Thermodynamics

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نشریه مهندسی عمران امیرکبیر
دوره 53، شماره 2
اردیبهشت 1400
صفحه 439-456

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