حذف نیکل از محیط آبی با استفاده از پوسته پسته سخت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه شهرکرد (

2 دانشجوی کارشناسی ارشد مهندسی آب، دانشکده کشاورزی، دانشگاه زابل

چکیده

نیکل یکی از فلزات سنگینی است که در فاضلابهای صنعتی به وفور یافت می‌شود. تحقیقات زیادی در زمینه استفاده از زائدات کشاورزی برای حذف نیکل از محلولهای آبی انجام شده است. هدف از این تحقیق، معرفی پوسته پسته سخت به‌عنوان یک جاذب محلی در حذف فلز نیکل از محیط آبی بود. همچنین در این تحقیق، مدل‌های ایزوترم جذب نیکل توسط پوسته پسته مورد بررسی قرار گرفت. برای این کار پوسته پسته تهیه شد و اندازه ذرات آن بین 600 تا 800 میکرون انتخاب گردید. همچنین محلول استوک یون نیکل به‌وسیله اختلاط نمک نیترات نیکل (NiSO4.6H2O) ساخت کارخانه مرک آلمان با آب مقطر تهیه گردید. نتایج نشان داد که حداکثر راندمان جذب (3/73 درصد) در pH برابر 8 اتفاق می‌افتد. همچنین برای یک غلظت ثابت، با افزایش جرم جاذب، زمان تعادل جذب کاهش (سرعت جذب افزایش) می‌یابد. نتایج حاصل از برازش مدل‌های ایزوترم جذب نشان داد که مدل‌های فروندلیچ، برونر-امیتر-تالر، راک-پرائونیتز، ردلیچ-پترسون و سیپس در سطح اعتماد 97 درصد داده‌ها را به‌خوبی توصیف می‌کنند، ولی مدل‌های فروندلیچ و سیپس با کمترین فاکتور خطا به‌ترتیب 10597/0 و 10598/0 و بیشترین ضریب همبستگی (9785/0) داده‌ها را بهتر توصیف می‌نمایند. مقایسه ظرفیت جاذبها در حذف نیکل از محیط آبی نشان داد که پوسته پسته سخت با سطح ویژه 7/1 متر مربع بر گرم و ظرفیت جذب 3984/0 میلی‌گرم بر گرم از جاذب‌های کائولینیت، باگاس و خاکستر لجن برای حذف نیکل مناسب‌تر است.

کلیدواژه‌ها


عنوان مقاله [English]

Removal of Nickel from Aqueous Solution by Hard-Shell Pistachios

نویسندگان [English]

  • Shayan Shamohammadi 1
  • Mojdeh Salari bardsiri 2
چکیده [English]

Nickel is one of the heavy metals which commonly can be found in industrial wastewater. Many studies have been done on agricultural waste for the removal of nickel from aqueous solutions. The purpose of this study is to identify hard-shell pistachios as a local attraction for removal of nickel from aqueous solution. Nickel adsorption isotherm models are studied using shell pistachios. Pistachio shell was chosen which its particle size is between 800-600 microns. The stock solution of nickel ions was prepared mixing nickel nitrate with distilled water. The results showed that the maximum absorption efficiency occurs (73.3%) at pH=8. Also, it was shown that with increasing adsorbent dose, equilibrium time decreased within constant concentration. Examination of uptake isotherm models showed that models of Freundlich, BET, Radke-Praunitz, Redlich-Peterson and Sips describe data in 97% level of confidence well,  however Freundlich and Sips isotherm models has the lowest error factor 0.10597 and 0/10598 respectively and the highest correlation coefficient (0.9785). Comparison of adsorbent capacity within removal of nickel from aqueous solution shows that Pistachio shell with special absorbent surface of 1.7 m2/g and uptake capacity of 0.3984 mg/g is proper than adsorbents of Kaolinite, Bagasse, sludge-ash.

کلیدواژه‌ها [English]

  • Adsorption
  • Hard-Shell Pistachios
  • nickel
  • Dosage Variation
  • Model
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