بررسی اثر عوامل کمپلکس‌ساز مونواتانول آمین و اگزالیک اسید بر خواص و عملکرد فوتوکاتالیستی اکسید روی در تخریب سریع رنگ متیلن بلو

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مواد و متالورژی دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

مقدمه و اهداف: اکسید روی (ZnO)، به دلیل جذب مناسب نور و کارایی بالا در تجزیه آلاینده‌های آلی، گزینه‌ای مطلوب به شمار می‌رود؛ هرچند محدودیت‌هایی مانند جذب کم نور مرئی و بازترکیب سریع بار دارد. راهکارهایی چون دوپ‌کردن، ایجاد پیوندهای ناهمگون برای بهبود عملکرد آن بررسی شده‌اند. در این پژوهش، تأثیر اسید اگزالیک و مونواتانول آمین به‌عنوان کمپلکس‌کننده بر خواص فوتوکاتالیستی ZnO بررسی شد.
مواد و روش‌ها: در این مطالعه اکسید روی، به روش سل-ژل سنتز شد و تأثیر اسید اگزالیک و مونواتانول، به‌‌عنوان دو عامل کمپلکس‌کننده بر خواص فوتوکاتالیستی آن مورد بررسی قرار گرفت.
یافته‌ها: تصاویر میکروسکوپ الکترونی روبشی نشان دادند که نمونه ZnO-MEA دارای توزیع ذرات یکنواخت‌تر و سطح صاف‌تر نسبت به ZnO-Oxalic است. آنالیز تبدیل فوریه فروسرخ حضور گروه‌های عاملی سطحی بیشتری را در نمونه ZnO-MEA نشان داد که از باقی‌ماندن مونواتانول آمین ناشی می‌شود. طیف‌سنجی UV-Vis و نمودار تائوک نشان داد که ZnO-MEA دارای شکاف انرژی کمتری (eV 3/08) نسبت به ZnO-Oxalic (eV 3/18) است که ناشی از اندازه ذرات بزرگ‌تر و وجود نقص‌های ساختاری کمتر است. 
نتیجه‌گیری: در این مطالعه، ZnO-MEA  با اندازه کریستالیت ۴۲ نانومتر (در برابر ۳۵ نانومتر برای ZnO-Oxalic) و ساختاری یکنواخت‌تر سنتز شد. شکاف انرژی ZnO-MEA نسبت به ZnO-Oxalic کمتر بود و موجب جذب بهتر نور شد. همچنین شدت طیف سنجی فوتولومینسانس پایین‌تر در ZnO-MEA، نشان‌دهنده بازترکیب کمتر الکترون-حفره بود. این عوامل موجب شدند ZnO-MEA در آزمون تخریب متیلن بلو، با کاهش سریع‌تر غلظت رنگ و شیب بالاتر نمودار، عملکرد فوتوکاتالیستی بهتری نسبت به ZnO-Oxalic داشته باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Effect of the Complexing Agents Monoethanolamine and Oxalic Acid on the Properties and Photocatalytic Performance of Zinc Oxide in the Rapid Degradation of Methylene Blue Dye

نویسندگان [English]

  • Mohammad Tashakkori Masouleh
  • Masood Hasheminiasari
  • Rouholah Ashiri
School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

Introduction and Objectives: Zinc oxide (ZnO) is considered as a promising material due to its efficient light absorption and high performance in the degradation of organic pollutants. However, it faces limitations such as poor visible light absorption and rapid charge carrier recombination. To overcome these challenges, approaches such as doping and heterojunction formation have been investigated to enhance its photocatalytic performance. In this study, the effect of oxalic acid and monoethanolamine (MEA) as complexing agents on the photocatalytic properties of ZnO was examined.
Materials and Methods: In this study, zinc oxide was synthesized by the sol–gel method, and the effect of oxalic acid and monoethanolamine as two complexing agents on its photocatalytic properties was investigated.
Results: scanning electron microscope images showed that the ZnO-MEA sample exhibited a more uniform particle distribution and smoother surface compared to ZnO-Oxalic. Fourier transform infrared analysis revealed the presence of more surface functional groups in the ZnO-MEA sample, attributed to residual monoethanolamine. UV-Vis spectroscopy and Tauc plots indicated that ZnO-MEA had a lower band gap energy (3.08 eV) than ZnO-Oxalic (3.18 eV), which is attributed to larger particle size and fewer structural defects.
Conclusion: In this study, ZnO-MEA with a crystallite size of 42 nm (as opposed to 35 nm for ZnO-Oxalic) and uniform structure was synthesized. Its energy gap was lower than ZnO-Oxalic, resulting in better light absorption. Moreover, the lower Photoluminescence spectroscopy intensity in ZnO-MEA indicated less electron–hole recombination. These factors led ZnO-MEA, in the methylene blue degradation test, to exhibit better photocatalytic performance than ZnO-Oxalic, with a faster decrease in dye concentration and a steeper slope in the plot.

کلیدواژه‌ها [English]

  • Photocatalyst
  • Zinc oxide
  • Sol-gel
  • Oxalic acid
  • Monoethanolamine
  • Methylene blue

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مواد پیشرفته در مهندسی
دوره 45، شماره 1
(شماره پیاپی 52)
فروردین 1405
صفحه 79-92

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