تخریب سونوکاتالیزوری تتراسایکلین با نانوذرات سولفید روی دوپه شده با ساماریوم: بهینه‌سازی و سینتیک فرایند

نوع مقاله: مقاله پژوهشی

نویسنده

دانشیار، گروه شیمی، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران

چکیده

تتراسایکلین از رایج‌‌ترین آنتی بیوتیک‌های مورد استفاده در درمان بیماری‌های عفونی است. ورود این ترکیب دارویی به محیط زیست می‌تواند منجر به مشکلات عدیده‌ای شود. این پژوهش با هدف بررسی کارایی حذف تتراسایکلین با فرایند سونوکاتالیزوری توسط سولفید روی دوپه شده با ساماریوم (Sm-ZnS) انجام شد. نانوذرات Sm-ZnS با روش هم‌رسوبی به کمک امواج فراصوت سنتز و استفاده شدند. آزمایش‌های سونوکاتالیزوری در بالن مجهز به حمام آب و تحت امواج فراصوت حاصل از پروب در شرایط عملیاتی مختلف انجام شدند. نتایج نشان داد که کارایی تخریب با افزایش مقدار کاتالیزور (از 2/0 تا 1 گرم در لیتر)، قدرت و زمان اعمال امواج فراصوت (به ‌ترتیب از 30 تا 50 وات و 10 تا 30 دقیقه) افزایش می‌یابد، در حالی که با افزایش غلظت اولیه دارو (از 10 تا 30 میلی‌گرم در لیتر) کاهش می‌یابد. مدل‌سازی و بهینه‌سازی فرایند با طراحی آزمایش به روش سطح پاسخ نشان داد تحت شرایط بهینه (غلظت اولیه تتراسایکلین برابر 15 میلی‌گرم در لیتر، مقدار Sm-ZnS برابر 4/0 گرم در لیتر قدرت امواج برابر 45 وات و مدت زمان 15 دقیقه) کارایی تخریب بیش از 97 درصد است. از بررسی‌های سینتیکی معلوم شد که فرایند سونوکاتالیزوری از مدل سینتیکی درجه اول ظاهری با ثابت سرعت min-1223/0 پیروی می‌کند. بر اساس یافته‌های به‌دست آمده می‌توان نتیجه گرفت که فرایند سونوکاتالیزوری با استفاده از کاتالیزور Sm-ZnS می‌تواند به‌عنوان روشی مؤثر و قابل دسترس برای حذف تتراسایکلین از فاضلاب و پساب صنایع دارویی استفاده شود.

کلیدواژه‌ها


عنوان مقاله [English]

Sonocatalytic Degradation of Tetracycline by Sm-Doped ZnS Nanoparticles: Optimization and Kinetics of Process

نویسنده [English]

  • Ali Mehrizad
Assoc. Prof., Dept. of Chemistry, Tabriz Branch, Islamic Azad University, Tabriz, Iran
چکیده [English]

Tetracycline (TC) is one of the most prevalent antibiotics which is used to treat the infectious diseases. Entrance of this pharmaceutical compound to the environment can lead to numerous problems. Therefore, this study was conducted with the aim of evaluation of the removal efficacy of TC by sonocatalytic process using samarium-doped zinc sulfide (Sm-ZnS). In this study, Sm-ZnS nanoparticles were synthesized through an ultrasound-assisted co-precipitation method and were used for sonocatalytic degradation of TC. The sonocatalytic experiments were conducted in a flask equipped with a water bath under the ultrasonic (US) waves resulting from a probe at different operational conditions. The results showed that the degradation efficiency increases with the increase of catalyst amount (0.2-1 g/L), US power (30-50 W) and time (10-30 min), and reduces with the increment of the TC initial concentration (10-30 mg/L). Modeling and optimization of the process by response surface methodology revealed that under the optimum conditions ([TC]0= 15 mg/L, [Sm-ZnS]0= 0.4 g/L, US power= 45 W and t= 15 min), degradation efficiency reached 97%. Kinetics studies showed that the sonocatalytic process follows the pseudo-first-order model with the rate constant of 0.223 min-1. Based on the results it can be concluded that the sonocatalytic process using Sm-ZnS catalyst can be used as an effective and available method to remove TC from sewage and pharmaceutical wastewater.

کلیدواژه‌ها [English]

  • Tetracycline
  • Sonocatalyst
  • Sm-doped ZnS
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