نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 گروه بهداشت، ایمنی و محیط زیست، شرکت پتروپارس، تهران، تهران، ایران

2 استادیار، پژوهشکده انرژی، پژوهشگاه مواد و انرژی، مشکین دشت، البرز، ایران

چکیده

در این تحقیق، زئولیت سلسله مراتبی ZSM، تهیه و به منظور استفاده در حذف یون نیترات، به­ وسیله تترا اتیلن پنتا آمین، اصلاح شد. ویژگی های ساختاری جاذب­ های سنتز شده، با استفاده از پراش اشعه ایکس (XRD)، میکروسکوپ الکترونی روبشی (SEM)، طیف سنجی زیر­قرمز تبدیل فوریه (FT-IR) و تجزیه و تحلیل جذب-واجذب N2، مورد بررسی قرار گرفت. نتایج نشان داد که زئولیت سلسله مراتبی اصلاح شده با تترا اتیلن پنتا آمین، ظرفیت جذب بالاتری نسبت به زئولیت سلسله مراتبی اصلاح نشده در حذف یون نیترات دارد. ظرفیت جذب بالاتر زئولیت آمین ­دار­شده، به ­دلیل حضور گروه ­های آمینی تترا اتیلن پنتا آمین است که منجر به افزایش سایت­ های فعال جاذب و برهم ­کنش الکترواستاتیکی بین سطح جاذب و آنیون ­های نیترات می­ شود. تأثیر چهار متغیر عملیاتی، شامل غلظت، مقدار جاذب، pH و زمان تماس، بر فرایند حذف نیترات، با استفاده از روش سطح پاسخ طرح مرکب مرکزی (RSM-CCD)، در 22 آزمایش و 5 سطح، مورد بررسی و بهینه­ سازی قرار گرفت. مقادیر بهینه برای بیشینه ظرفیت حذف، غلظتِ 50 میلی گرم بر لیتر نیترات، مقدار 005/0 گرم جاذب، زمان 25 دقیقه و 4=pH به دست آمد.

کلیدواژه‌ها

عنوان مقاله [English]

Optimization of Nitrate Removal from Aqueous Solutions with ZSM Hierarchical Zeolite Modified with Amine Using Response Surface Method

نویسندگان [English]

  • Samira Salehi 1
  • Mojtaba Hosseinifard 2

1 Department of Health, Safety and Environment, Petropars Company, Tehran, Tehran, Iran

2 Assistant Professor, Department of Energy, Materials and Energy Research Center (MERC), MeshkinDasht, Alborz, Iran

چکیده [English]

In this study, the ZSM hierarchical zeolite was prepared and modified by tetraethylenepentamine to be used to remove nitrate ions. The features of synthesized adsorbents were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR)and nitrogen adsorption–desorption isotherms. The results showed that the modified hierarchical zeolite with the tetraethylenepentamine had a higher adsorption capacity than that of the unmodified hierarchical zeolite in the removal of nitrate ion. The higher adsorption capacity of the amine modified zeolite is due to the presence of amine groups of tetraethylenepentamine, which leads to an increase in the active sites of adsorbent and an electrostatic interaction between the adsorbent surface and nitrate anions. The effect of four parameters including concentration, adsorbent dose, pH and contact time on the nitrate removal using Central composite design approach-based response surface methodology (RSM-CCD) and was investigated and optimized in 22 experiments and 5 levels. Optimal values for a maximum adsorption capacity were 50 milligrams per liter of nitrate, 0.005 g of adsorbent, 25 min and pH = 4.
 

کلیدواژه‌ها [English]

  • Zeolite
  • tetraethylenepentamine
  • Nitrate
  • Adsorption
  • Response surface methodology (RSM)
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