حذف اکسی‌تتراسایکلین توسط نانو ذرات آهن در فرایند فتواکسیداسیون و بهینه‌سازی حضور یون‌های رقیب

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

2 استاد، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

3 دانشیار دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

چکیده

با توجه به بروز مقاومت ژنتیکی به‌عنوان یکی از مشکلات جدی در مسائل محیط‌ زیستی که ناشی از دفع مستقیم فاضلاب حاوی آنتی‌بیوتیک‌های سخت تجزیه‌پذیر به محیط زیست است، تصفیه این فاضلاب‌ها از اهمیت خاصی برخوردار است. در شرایط بهینه تحقیق،155 میلی‌گرم در لیتر اکسی‌تتراسایکلین که یکی از پرمصرف‌ترین آنتی‌بیوتیک‌ها است، توسط 1000 میلی‌گرم در لیتر نانو ذرات آهن در pH برابر 3 و تحت تابش UV-A با توان 200 وات در مدت زمان 5/6 ساعت تصفیه شد. مقادیر حذف در طول موج‌های 290 و 348 نانومتر، TOC و COD به‌ترتیب 87، 95، 85 و 89 درصد به‌دست آمدند. مطابق با نتیجه آنالیز XRD، FeO و FeOOH، لایه اکسید تشکیل شده بر سطح نانو ذرات آهن بوده که اثرات مثبت فتوکاتالیستی در فرایند حذف داشت. همچنین با توجه به حضور یون‌هایی نظیر کلسیم، منیزیم، کلرید، نیترات، بی‌کربنات و سولفات در ترکیب فاضلاب‌ها و آب‌های سطحی، بررسی مخلوط آنها در فرایند حذف اکسی‌تتراسایکلین ضروری بوده و مدل‌سازی آماری آن با روش سطح پاسخ به تعیین میزان اثرگذاری این یون‌ها در مجاورت یکدیگر و پیش‌بینی کارایی حذف کمک کرد. بر اساس نتایج بهینه‌سازی، داده‌ها با سطح اطمینان 95 درصد با مدل مطابقت داشته و یون‌های بی‌کربنات و سولفات در فرایند حذف بی‌اثر بوده و مجموعه یون‌های کلرید و نیترات اثر منفی‌تری در فرایند حذف نسبت به دو یون کلسیم و منیزیم نشان دادند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Oxytetracycline Removal with Nano Zero Valent Iron Using the Photo-oxidation Process and Optimization of Comparative Ions

نویسندگان [English]

  • Parisa Hassanzadeh 1
  • Hossein Ganjidoust 2
  • Bita Ayati 3
1 PhD Student of Civil and Environmental Engineering, Tarbiat Modares University, Tehran
2 Prof. of Civil and Environmental Engineering, Tarbiat Modares University, Tehran
3 Assoc. Prof. of Civil and Environmental Engineering, Tarbiat Modares University, Tehran
چکیده [English]

Due to their rather non-degradability and the emerging genetic resistance against them, antibiotics discharged into domestic effluents pose a serious environmental hazard while the conventional biological treatment methods are not adequately efficienct in removing them. In the present study, the chemical reaction between oxytetracycline (OTC) and nano zerovalent iron (NZVI) modified by UV-A radiation was investigated. In the batch experiments, concentration of reactants, pH, UV power, and time were optimized. In this process, the UV power was 200 W and 155 mg/L OTC in an aqueous solution was degraded after 6.5 hours using 1000 mg/L of the nano-iron powder at pH 3. TOC and COD removal efficiencies of 87, 95, 85, and 89% were achieved at 290 and 348 nm, respectively. In a similar process, no organic compounds remained after 14 hours. Based on XRD analysis, FeO and FeOOH comprised the oxide layer on the surface of the nanoparticles, which had positive effects on the photocatalytic process. Changing the parameters of ORP, pH, and DO during the process caused the photocatalytic reaction to start after 3 hours. It was also found that, due to the presence of ions such as calcium, magnesium, chloride, nitrate, sulfate, and bicarbonate in sewage and surface water compositions, it is necessary to consider their mixture in the oxytetracycline elimination process while their statistical modeling using the response surface methodology also helps in the prediction ofe the effects of these ions. Data optimization results matched thos eof the model at 95% confidence level. It was found that while bicarbonate and sulfate ions had no effect on the process, chloride and nitrate ions had more negative effects than calcium and magnesium on OTC removal since they prohibit the destruction of aromatic rings.

کلیدواژه‌ها [English]

  • COD
  • TOC
  • Calcium
  • Magnesium
  • Chloride
  • Nitrate

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