بررسی کارایی زئولیت 4A اصلاح شده با مس در حذف آنتی‌بیوتیک تتراسایکلین از محیط آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی شیمی، دانشکده مهندسی نفت و پتروشیمی، دانشگاه حکیم سبزواری، سبزوار، ایران

2 دانشجوی کارشناسی ارشد، گروه مهندسی شیمی، دانشکده مهندسی نفت و پتروشیمی، دانشگاه حکیم سبزواری، سبزوار، ایران

3 دانشجوی کارشناسی، گروه مهندسی شیمی، دانشکده مهندسی نفت و پتروشیمی، دانشگاه حکیم سبزواری، سبزوار، ایران

چکیده

آنتی‌بیوتیک‌ها با توجه به میزان بالای آنها در پساب‌های شرکت‌های دارویی و بیمارستان‌ها از آلاینده‌های مهم دارویی به‌شمار می‌روند. تتراسایکلین‌ها به‌عنوان یک مهارگر باکتریایی نسبتاً ارزان‌قیمت یکی از پرکاربردترین آنتی‌بیوتیک‌های مورد استفاده برای انسان و مکمل غذایی و دارویی دام است که موجب انتشار گسترده آن به محیط‌زیست شده است. در این پژوهش از زئولیت 4A به‌دلیل سطح مخصوص و قابلیت تعویض یونی بالا استفاده شد و برای افزایش ظرفیت جذب تتراسایکلین با مس اصلاح شد. روش تلقیح به‌عنوان یکی از روش‌های ساده و تکرارپذیر برای افزودن مس با نسبت‌های مختلف به ساختار زئولیت استفاده شد. جاذب مورد‌استفاده با آنالیزهای FESEM، FTIR، XRD و BET تعیین مشخصه شد. آزمایش‌های جذب با بررسی اثر نسبت جرمی مس به زئولیت، وزن جاذب، در pH های مختلف طی زمان انجام شد. ایزوترم و سینتیک جذب به‌منظور بررسی ظرفیت جذب و مکانیسم انتقال تتراسایکلین از توده به سطح جاذب و نفوذ درون حفره‌ای بررسی شد. سطح مخصوص جاذب طی فرایند اصلاح با مس از m2/g 36 به m2/g 635 افزایش یافت. حداکثر میزان جذب در pH برابر 8/6 و نسبت وزنی نیترات مس به زئولیت 4/0 بر اساس تئوری لانگمیر از 41 به مقدار حدود mg/g 416 حاصل شد و پس از آن میزان جذب با کاهش مواجه شد. ایزوترم فرندلیش مطابقت بهتری با داده‌های تعادلی نشان داد و سینتیک درجه دوم سرعت واکنش را بهخوبی پیش‌بینی کرد. آنالیز تبدیل فوریه مادون قرمز نشان داد که پیوند الکتراستاتیکی بین گروه‌های کربونیل و فنول تتراسایکلین با مس یک از مکانیسم‌های اصلی جذب تتراسایکلین بر روی زئولیت اصلاح شده است. نتایج نشان دادند که مس با تغییر ساختار داخلی به‌صورت کاهش شعاع حفرات و افزایش سطح مخصوص، ظرفیت جذب زئولیت را به مقدار قابل‌توجهی افزایش داده است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Zeolite 4A Modified by CU for Tetracycline Removal from Aqueous Environment

نویسندگان [English]

  • Seyed Mohammad Mahdi Nouri 1
  • Zahra Fazaelipour 2
  • Nahid Mehri 3
  • Hamid Heydarzadeh Darzi 1
1 Assist. Prof., Dept. of Chemical Engineering, Faculty of Petroleum and Petrochemical Engineering, Hakim Sabzevari University, Sabzevar, Iran
2 MSc. Student, Dept. of Chemical Engineering, Faculty of Petroleum and Petrochemical Engineering, Hakim Sabzevari University, Sabzevar, Iran
3 BSc. Student, Dept. of Chemical Engineering, Faculty of Petroleum and Petrochemical Engineering, Hakim Sabzevari University, Sabzevar, Iran
چکیده [English]

Antibiotics are common drug contaminants due to their high levels in the effluents of pharmaceutical companies and hospitals. Tetracyclines, as a relatively inexpensive bactericidal inhibitor, are one of the most widely used antibiotics for humans and animal food and pharmaceutical supplements, which have led to their widespread release into the environment. In this paper, zeolite 4A, due to its high specific surface area and ion exchangeability has been modified to increase the adsorption capacity of tetracycline using copper ion. Impregnation method as one of the simple and reproducible methods has been used to add copper with different ratios to the zeolite structure. The adsorbent characterizations were investigated using FESEM, FTIR, XRD and BET analyses. Adsorption experiments were performed by investigating the effect of copper to zeolite mass ratio, adsorbent weight, and different pH over time. Adsorption isotherms and kinetics have been investigated to investigate the adsorption capacity and transfer mechanism of tetracycline from liquid bulk to the adsorbent surface and intraparticle diffusion. The specific surface area of the adsorbent increased from 36 m2/g to 635 m2/g during the modification process. The maximum adsorption is achieved at pH 6.8 and the weight ratio of copper nitrate to zeolite is 0.4, which according to Langmuir's theory increases from 41 to about 416 mg/g and for higher copper to zeolite ratio the adsorption capacity decreases. The Freundlich isotherm showed better agreement with the equilibrium data and the second order kinetic model predicted the reaction rate data more accurately. FTIR analysis showed that the electrostatic bond between the carbonyl and phenol groups of tetracycline with copper is one of the main mechanisms of tetracycline adsorption on the modified zeolite. The results showed that copper has significantly increased the adsorption capacity of zeolite by changing the internal structure and reducing the radius of cavities and increasing the specific surface area.

کلیدواژه‌ها [English]

  • Tetracycline
  • Zeolite
  • Surface modification
  • Adsorption
  • Water Treatment
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