بهینه‌سازی فرآیند تخریب فتوکاتالیستی آنتی‌بیوتیک آموکسی‌سیلین با استفاده از نانوکامپوزیت SiO2@TiO2

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم و مهندسی محیط زیست، دانشکده کشاورزی و منابع طبیعی. دانشگاه اردکان، اردکان، ایران.

2 گروه علوم و مهندسی محیط زیست، دانشکده کشاورزی و منابع طبیعی، دانشگاه اردکان، اردکان، ایران.

3 گروه محیط زیست، دانشکده منابع طبیعی و محیط زیست، دانشگاه بیرجند، بیرجند، ایران.

10.22059/jne.2023.351839.2503

چکیده

امروزه یکی از چالش­ های مهم در تصفیة فاضلاب تخریب آلاینده­ های آلی خصوصاً آنتی‌بیوتیک­ ها است. در این پژوهش به بررسی کارایی فرآیند فوتوکاتالیستی در حذف آنتی‌بیوتیک آموکسی‌سیلین از محیط آبی با استفاده از نانوکامپوزیت SiO2@TiO2 پرداخته شد. نانوکامپوزیت مورد نظر با استفاده از روش سل ژل سنتز‌شده و با تکنیک‌های XRD، FT-IR و TEM بررسی شد. برای بهبود عملکرد نانوکامپوزیت ساخته شده، پارامترهایی از قبیل pH محلول، زمان تماس، غلظت نانوکامپوزیت و غلظت دارو مورد مطالعه قرار گرفت و با استفاده از روش سطح پاسخ و مدل باکس بنکن بهینه شد. بررسی ساختار نانوکامپوزیت با XRD نشان‌دهندة تشکیل فازهای بلوری و ساختار آناتاز است. تشکیل نانوکامپوزیت SiO2@TiO2 با پیوند Ti-O-Si در طیف FT-IR  تأیید شد. همچنین تصویر TEM نشان داد ذرات، ساختار کروی و یکنواخت دارند. نتایج آزمایش‌های بهینه­ سازی فتوکاتالیستی نشان داد که بیشترین بازدهی تخریب آموکسی‌سیلین تحت شرایط 3pH: ، غلظت اولیة آموکسی‌سیلین: 10 میلی­ گرم بر لیتر، غلظت نانوکامپوزیت: 2 گرم بر لیتر، زمان تماس: 10 دقیقه به میزان 98/7 درصد است که به بازدهی حذف پیش ­بینی‌شده تحت شرایط بهینه در مدل باکس بنکن (100%) بسیار نزدیک است. با توجه به بازدهی تخریب بالا و تولید بالای رادیکال­ های آزاد، فتوکاتالیست سنتزی قابلیت بالایی جهت تخریب آلاینده های دارویی خصوصاً آنتی‌بیوتیک­ ها دارد که کاربردهای آیندة آن را جهت تخریب آلاینده­ های آلی با ساختار شیمیایی مشابه توسعه می­ دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Optimization of the photocatalytic degradation process of amoxicillin antibiotic using SiO2@TiO2 nanocomposite

نویسندگان [English]

  • Zahra Tahanpour 1
  • Akram Bemani 2
  • Mohammad Hossein Sayadi 3
  • Elham Chamanehpour 3

1 Department of Environmental Sciences & Engineering, Faculty of Agriculture & Natural Resources, Ardakan University, Ardakan, Iran.

2 Department of Environmental Sciences & Engineering, Faculty of Agriculture & Natural Resources, Ardakan University, Ardakan, Iran.

3 Department of Environmental Sciences, Faculty of Natural Resources and Environment, University of Birjand, Birjand, Iran.

چکیده [English]

Today, one of the most important challenges in wastewater treatment is the destruction of organic pollutants, especially antibiotics. This research investigated the efficiency of the photocatalytic process in removing the antibiotic amoxicillin from the water environment using SiO2@TiO2 nanocomposite. The desired nanocomposite has been synthesized using sol-gel method and characterized by XRD, FTIR and TEM techniques. To improve the performance of the fabricated nanocomposite, parameters such as pH, contact time, nanocomposite concentration, and drug concentration were studied and optimized using the response surface method and the Central Composite Design model. Characterization of nanocomposite with XRD showed the formation of crystalline phases and anatase structure. The formation of SiO2@TiO2 nanocomposite with Ti-O-Si bond was confirmed in FT-IR spectrum. Also, the TEM image showed that the particles have a spherical and uniform structure. The results of photocatalytic optimization experiments showed that the highest degradation efficiency (98.7%) of amoxicillin under pH:3, amoxicillin initial concentration: 10 mg/L, nanocomposite concentration: 2 g/L, contact time: 10 minutes, which is very close to the efficiency of predicted removal under optimal conditions in the BBD model (100%). Due to the high degradation efficiency and high production of free radicals, the synthetic photocatalyst has a high ability to degrade pharmaceutical pollutants, especially antibiotics, which develops its future applications for the degradation of organic pollutants with a similar chemical structure.

کلیدواژه‌ها [English]

  • Pharmaceutical pollutants
  • Wastewater treatment
  • Response surface method
  • Heterogeneous catalyst
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