ارزیابی کارایی جاذب مغناطیسی قابل بازیافت نیکل فریت در حذف آلاینده رنگی از محیط آبی
محورهای موضوعی : تکنولوژی آب و فاضلاب
سیده بهاره عظیمی
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زهرا منصف خوشحساب
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زهرا ایازی
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1 - گروه ارزیابی و مخاطرات محیط زیست، پژوهشکده محیط زیست و توسعه پایدار، سازمان حفاظت محیط¬زیست، تهران، ایران.
2 - گروه شیمی، دانشگاه پیام نور، قزوین، ایران.
3 - گروه شیمی، دانشکده علوم پایه، دانشگاه شهید مدنی آذربایجان، تبریز، ایران.
کلید واژه: تصفیه پساب, فرایند جذب سطحی, نانو ذرات مغناطیسی, نیکل فریت,
چکیده مقاله :
در این پژوهش جاذب مغناطیسی نیکل فریت سنتز و مشخصهیابی شده و برای حذف رنگ از محیط آبی به روش جذب سطحی مورد استفاده قرار گرفته است. به این منظور تاثیر پارامترهای مختلف از قبیل غلظت اولیه رنگ، مقدار جاذب، زمان تماس و pH محلول به روش طراحی آزمایش بررسی، مدل و بهینه شده است. همچنین سینتیک فرایند بر اساس معادلات شبه مرتبه اول و شبه مرتبه دوم بررسی شده و تطابق فرایند با الگوهای جذبی لانگمویر و فراندلیچ مورد ارزیابی قرار گرفته است. مشخصهیابی جاذب سنتز شده نشان داد که جاذب مغناطیسی به طور متوسط nm 18 است. مدل سازی و بهینه سازی فرایند به روش آماری پاسخ سطح (RSM) در قالب طراحی مرکب مرکزی (CCD) انجام شد و نتایج نشان داد که در شرایط بهینه شامل غلظت اولیه رنگ mg/L 110، زمان تماس min 90، مقدار جاذب g05/0 و 3 = pH، مقدار جذب تعادلی mg/g 76/3 (معادل 2/93 درصد بازده حذف رنگ) است. بنابراین، با توجه به ساختار رنگ و نوع جاذب مورد استفاده بازده در شرایط اسیدی بهتر است. بررسی سینتیک و همدمای جذب نشان داد که فرایند از سینتیک شبه مرتبه دوم و همدمای لانگمویر تبعیت کرده و بر اساس معادله لانگمویر مقدار حداکثر ظرفیت جذب رنگ mg/g 1/21 است. با توجه به مغناطیسی بودن جاذب مورد استفاده، در پایان فرایند میتوان جاذب را از محیط به راحتی و با کمترین هزینه جدا کرد.
In this study, a magnetic nickel ferrite adsorbent was synthesized, characterized, and used for dye removal from an aqueous medium through adsorption. To this end, the effects of various parameters, including initial dye concentration, adsorbent dosage, contact time, and solution pH, were investigated, modeled, and optimized using experimental design. Furthermore, the kinetics of the process were studied based on pseudo-first-order and pseudo-second-order equations, and the conformity of the process to the Langmuir and Freundlich adsorption isotherms was evaluated. Characterization of the synthesized adsorbent revealed that the magnetic nanoparticles had an average size of 18 conformity nm. Modeling and optimization of the process were carried out using response surface methodology (RSM) based on central composite design (CCD). The results showed that under optimal conditions, i.e., an initial dye concentration of 110 mg/L, a contact time of 90 min, an adsorbent dosage of 0.05 g, and pH = 3, the equilibrium adsorption capacity was 3.76 mg/g (equivalent to 93.2% dye removal efficiency). Therefore, considering the dye structure and the type of adsorbent used, the removal efficiency was higher under acidic conditions. The study of adsorption kinetics and isotherms indicated that the process followed pseudo-second-order kinetics and the Langmuir isotherm, and based on the Langmuir equation, the maximum dye adsorption capacity was 21.1 mg/g. Due to the magnetic nature of the adsorbent, it can be easily separated from the aqueous medium at the end of the process with minimal cost.
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