مقایسه جاذبهای کربن فعال، خاک اره، پوسته فندق و پوسته بادام در حذف نیکل از محیط آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد آبیاری و زهکشی، دانشگاه زابل، زابل

2 دانشیار گروه مهندسی آب، دانشگاه شهرکرد، شهرکرد

چکیده

در حال حاضر یکی از مهم‌ترین آلاینده‌های محیط زیست، پسابهای صنعتی حاوی فلزات سنگین هستند. نیکل یکی از این فلزات سمّی است که غلظت بالای آن باعث حساسیت پوستی، بیماری‌های قلبی، انواع سرطان‌ها و غیره می‌شود، بنابراین حذف نیکل از پسابهای صنعتی ضروری به‌نظر می‌رسد. هدف از این تحقیق مقایسه سینتیک و ایزوترم جذب نیکل توسط کربن فعال، خاک اره، پوسته فندق و پوسته بادام بود. برای این کار ابتدا جاذبها تهیه شد و برای حذف نیکل از محلول با غلظتهای 5/2 تا 125 میلی‌گرم در لیتر استفاده شد. نتایج آزمایش‌های pH نشان داد که برای جاذبهای کربن فعال، خاک اره، پوسته فندق و پوسته بادام حداکثر مقدار جذب، به‌ترتیب در pH 6 ، 6 ، 6 و 7 به‌دست آمد. آزمایش‌های سینتیک جذب نشان داد که حداکثر زمان تعادل در غلظت 5 میلی‌گرم در لیتر برای جاذبهای کربن فعال، پوسته فندق، خاک اره و پوسته بادام به‌ترتیب برابر 60 ، 75 ، 120 و 150 دقیقه است. نتایج برازش مدل‌های سینتیک نشان داد که برای جاذبهای پوسته فندق و خاک اره، مدل لاگرگرن و برای جاذبهای کربن فعال و پوسته بادام مدل هو و همکاران، در سطح 95 درصد اعتماد دارای کمترین فاکتور خطا و بیشترین ضریب همبستگی است و سرعت جذب سطحی نیکل به‌صورت پوسته بادام < خاک اره < پوسته فندق < کربن فعال است. مطالعه ایزوترم جذب نشان داد که با توجه به فاکتور خطا و ضریب همبستگی برای تمامی جاذبها، به‌ترتیب مدل‌های ردلیچ پترسون و لانگمیر داده‌های ایزوترم را بهتر توصیف می‌کنند. همچنین نتایج نشان داد که حداکثر زمان تعادل تابع توانی از ظرفیت جاذب است.

کلیدواژه‌ها


عنوان مقاله [English]

Comparison of Active Carbon, Sawdust, Almond Shell and Hazelnut Shell Absorbent in Removal of Nickel from Aqueous Environment

نویسندگان [English]

  • Moslem Mohammadi Galehzan 1
  • Shayan Shamohammadi 2
چکیده [English]

The most important environmental pollutants are heavy metals in industrial wastewater effluents. Nickel is one of the toxic heavy metals which its high concentration causes skin allergy, heart disease and various cancers. So removal of this element from industrial effluent is of prime concern and necessary. The main purpose of this study is to compare kinetics and isotherms of nickel uptake by activated carbon (AC), sawdust (SD), hazelnut shell (SH) and almond shells (AH). Adsorbents are initially prepared to remove nickel from solutions with concentrations 2.5 to 125 mg/l. pH test results showed that maximum absorption using AC, SH, SD and AH obtained at pH 6, 6, 6 and 7 respectively. Kinetics experiments showed that maximum absorption equilibrium time at concentration of 5 mg/l of AC, SH, SD and AH occur at 60, 75, 120 and 150 minutes respectively. Kinetic models fitting results showed that for sawdust and hazelnut shells, Lagergern model and for activated carbon and peanut shell Ho et al. model are suitable and have the lowest error and highest correlation coefficient at 95 percent confidence level. The results also revealed that rate of Nickel adsorption follows this order: AH <SD <SH <AC. Adsorption isotherms studies showed that according to error factor and correlation coefficient for all of the adsorbents, Rdlych Peterson and Langmuir isotherms described data better than the others. The results also showed that equilibrium time is an exponential function of the absorption capacity.

کلیدواژه‌ها [English]

  • Adsorption
  • Activated carbon
  • Hazelnut Crust
  • Shell Peanuts
  • Sawdust
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