تخریب آنتی‌بیوتیک مترونیدازول با استفاده از نانوکامپوزیت مغناطیسی سنتز شده جدید در سیستم شبه فنتون ناهمگن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، مرکز تحقیقات عوامل اجتماعی مؤثر بر سلامت، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی بیرجند، بیرجند، ایران

2 دانشیار، مرکز تحقیقات عوامل اجتماعی مؤثر بر سلامت، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی بیرجند، بیرجند، ایران

3 دانشیار، گروه علوم و مهندسی محیط ‌زیست، دانشکده منابع طبیعی و محیط‌ زیست، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

4 استاد گروه شیمی، دانشکده علوم، دانشگاه بیرجند، ایران

چکیده

آنتی‌بیوتیک‌ها، آلاینده‌هایی با منشأ آلی هستند که به‌طور عمده از طریق پساب‌های شهری و صنعتی وارد منابع آب سطحی و زیرزمینی می‌شوند و به‌دلیل پایداری بالا، نه تنها باعث اختلال در فرایندهای متداول تصفیه فاضلاب می‌شوند، بلکه اثرات سمی بر انسان و دیگر موجودات زنده دارند و از اینرو حذف آنها ضروری است. این پژوهش یک مطالعه تجربی در مقیاس آزمایشگاهی است که با هدف بررسی کارایی نانوکامپوزیت مغناطیسی جدید FeNi3/SiO2/CuS به‌منظور تجزیه مترونیدازول در حضور H2O2 به‌عنوان فرایند کاتالیستی شبه فنتون ناهمگن در محلول‌های آبی صورت گرفت. در این پژوهش، ابتدا نانوکامپوزیت مورد نظر سنتز و خصوصیات آن توسط دستگاهFESEM ، TEM، FTIR، XRD و VSM بررسی شد. این پژوهش به‌صورت ناپیوسته بر روی فاضلاب سنتتیک انجام شد و پارامترهایی مانند pH (3، 5، 7، 9 و 11)، دز نانوکامپوزیت (005/0 تا 1/0 گرم در لیتر)، غلظت مترونیدازول (10 تا 30 میلی‌گرم در لیتر) و غلظت پراکسید هیدروژن (50 تا 200 میلی‌گرم در لیتر) در دمای محیط مورد بررسی قرار گرفت. نتایج به‌دست آمده نشان داد، بیشترین درصد حذف مترونیدازول در pH برابر 7، دز نانوکامپوزیت 1/0 گرم در لیتر، غلظت پراکسید هیدروژن 150 میلی‌گرم در لیتر برای غلظت آلاینده 20 میلی‌گرم در لیتر در زمان 180 دقیقه، 92/77 درصد است. همچنین سینتیک واکنش از معادله شبه درجه اول (95/0R2>) تبعیت کرده و نرخ ثابت تخریب این واکنش
min-10038/0بود. بر اساس داده‌های حاصل از این پژوهش، می‌توان نتیجه گرفت که فرایند کاتالیستی شبه فنتون ناهمگن کارایی خوبی در حذف آلاینده آنتی‌بیوتیک مترونیدازول از محلول‌های آبی دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Degradation of Metronidazole Antibiotic Using a Novel Synthesized Magnetic Nanocomposite in Heterogeneous Fenton-like Catalytic Process

نویسندگان [English]

  • Negin Nasseh 1
  • Behnam Barikbin 2
  • Lobat Taghavi 3
  • Mohammd Ali Nasseri 4
1 Assist. Prof., Social Determinants of Health Research Center, Dept. of Environmental Health Engineering, School of Health, Birjand University of Medical Sciences, Birjand, Iran
2 Assoc. Prof., Social Determinants of Health Research Center, Dept. of Environmental Health Engineering, School of Health, Birjand University of Medical Sciences, Birjand, Iran
3 Assoc. Prof., Dept. of Science and Environemntal Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic, Azad University, Tehran, Iran
4 Prof., Dept. of Chemistry, Faculty of Science, University of Birjand, Iran
چکیده [English]

Antibiotics are organic pollutants that are introduced into surface water and underground water sources due to urban and industrial effluents. Due to their high stability, they do not only disrupt the common processes of sewage treatment, but also have toxic effects on humans and other living organisms, and their removal have therefore been considered. This is an experimental study in a laboratory scale with the aim of evaluating the efficiency of the new FeNi3/SiO2/CuS magnetic nanocomposite for the decomposition of metronidazole in the presence of H2O2 as a heterogeneous Fenton- like catalytic process in aqueous solutions. In present study, firstly, this nanocomposite was synthesized and characterized by FESEM, TEM, FTIR, XRD and VSM. This study, which was performed on synthetic sewage in batch system, parameters such as pH (3, 5, 7, 9 and 11), nanocomposite dose (0.005- 0.1 g/L), metronidazole concentration (10-30 mg/L) and the concentration of hydrogen peroxide (50-200 mg/L) at ambient temperature was investigated. The obtained results showed that the highest percentage of removal of metronidazole in pH =7, nanocomposite dose (0.1 g/L), hydrogen peroxide concentration of 150 mg/L for 20 mg/L contaminant concentration at time of 180 minutes, 77.92%. Also, the kinetic rate of degradation flowed pseudo-first-order equation (R2=0.95) and the degradation constant rate of this reaction is 0/0038 (1/min). Based on the results obtained from this study, it can be concluded that Hentrogenase Fenton like catalytic process has a very good effect in removing metronidazole antibiotic contamination from aqueous solutions.

کلیدواژه‌ها [English]

  • Heterogeneous Fenton-like Process
  • Advanced Oxidation
  • Meteronidazole
  • Magnetic Nanocatalysis
  • Aquatic Solution

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مجله آب و فاضلاب
دوره 30، شماره 4 - شماره پیاپی 122
مهر و آبان 1398
صفحه 94-108

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