ارزیابی عملکرد کاتالیزور نوری MnCeOx/TiO2 در حذف رنگزاهای آلی در نور مرئی

نوع مقاله : مقاله پژوهشی

نویسنده

گروه شیمی کاربردی، دانشکده علوم پایه، دانشگاه کوثر بجنورد، بجنورد، ایران، کد پستی: ۹۴۵۳۱۵۵۱۶۸

10.30509/jcst.2026.167706.1275

چکیده

در این پژوهش، کاتالیزوز نوری MnCeOx/TiO2 سنتز و عملکرد آن در رنگ‌زدایی کاتالیزوری چهار رنگزای آلی شامل متیلن بلو (MB)، متیل رد (MR)، رودامین­بی (RhB) و مالاشیت گرین (MG) در نور مرئی بررسی شد. بیشترین بازده رنگ‌زدایی مربوط به MB (حدود 4/92 درصد) بود و بازده سایر رنگزاهای MG، RhB و MR به ترتیب در حدود 5/65، 8/24 و 3/19 درصد به‌دست آمد. با استفاده از روش سطح پاسخ و مدل درجه دوم، اثر pH، زمان تابش، غلظت رنگزا و مقدار کاتالیست بر بازده بررسی و شرایط بهینه شامل pH برابر 3، زمان تابش 35 دقیقه در غلظت رنگزا ppm 7 و جرم کاتالیستg  3/0 تعیین شد. سازوکار نشان داد که تولید گونه‌های فعال اکسیژن از طریق جدایش جفت الکترون–حفره و تله‌های الکترونی Mn و Ce، عامل اصلی تخریب گروه‌های رنگ‌ساز است. تحلیل سینتیکی کاتالیزوری نوری MB مطابق مدل شبه‌مرتبه اول با min-1 0471/0k ≈  و نیمه‌عمر ≈ 7/14دقیقه انجام شد. نتایج نشان‌دهنده فعالیت بالا، پایداری و قابلیت بازیابی این کاتالیزور نوری است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of MnCeOx/TiO2 Photocatalyst Performance for Visible-Light-Induced Decolorization of Organic Dyes

نویسنده [English]

  • Nastaran Parsafard
Department of Applied Chemistry, Faculty of Basic Sciences, Kosar University of Bojnord, P.O. Code: 9453155168, Bojnord, Iran
چکیده [English]

In this study, the MnCeOx/TiO2 photocatalyst was synthesized, and its performance in the visible-light photocatalytic decolorization of four organic dyes, including methylene blue (MB), methyl red (MR), rhodamine B (RhB), and malachite green (MG), was investigated. The highest decolorization efficiency was observed for MB (≈92.4 %), while the efficiencies for MG, RhB, and MR were ≈65.5, 24.8, and 19.3 %, respectively. Using response surface methodology (RSM) with a second-order model, the effects of pH, irradiation time, dye concentration, and catalyst dosage on decolorization were evaluated, and the optimal conditions were determined as pH ≈ 3, irradiation time ≈ 35 min, dye concentration ≈ 7 ppm, and catalyst mass ≈ 0.3 g. Mechanistic analysis indicated that the generation of reactive oxygen species through electron–hole separation and Mn/Ce electron traps is the main factor in chromophore degradation. Kinetic studies showed that MB decolorization follows a pseudo-first-order model with k ≈ 0.0471 min-1 and a half-life of ≈14.7 min. The results demonstrate high photocatalytic activity, stability, and reusability of this photocatalyst.

کلیدواژه‌ها [English]

  • MnCeOx/TiO2
  • Photocatalyst
  • Methylene blue
  • Response Surface Methodology
  • Visible light
  • Wastewater treatment

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