Photocatalytic degradation of Congo red by ZnO nanoparticles with different morphology

Document Type : Original Article

Author

Department of Chemistry, East Tehran Branch, Islamic Azad University, Tehran, Iran

Abstract

In this study, ZnO nanoparticles in three shapes, spherical, rod, and sheet are
synthesized by a hydrothermal method using three different surfactants, namely three
ethanol amine, cetyl three methyl ammonium bromide, and sodium dodecyl sulfate. In
all cases, the chemical composition, powder identification, morphology. and particle
size of the final product are characterized by Fourier transform infrared (FTIR), X-ray
diffraction (XRD), field emission scanning electronic microscopy (FESEM), EDX
elemental analysis, and UV-Vis spectroscopy. The photocatalytic activity of the
nanoparticles are investigated for degradation of organic pollutants (Congo red dye).
The removal tests of Congo red as a water organic pollutant indicates photocatalytic
activity and absorption ability of synthesized zinc oxides. Finally, the comparison of
the dye removal results show that the rod nanoparticle has more efficiency in the
degradation of Congo red with 97% yield over 2 hours at pH=8.

Keywords

Article Title [فارسی]

تخریب فوتوکاتالیستی کنگورد توسط نانوذرات اکسید روی با مورفولوژی متفاوت

Author [فارسی]

  • نسیبه ملاحسنی

گروه شیمی،واحد تهران شرق،دانشگاه آزاد اسلامی، تهران، ایران

Abstract [فارسی]

در این مطالعه، نانوذرات اکسید روی در سه شکل کروی، میله ای و صفحه ای با استفاده از روش هیدروترمال و سه سورفکتانت متفاوت یعنی تری اتانول آمین ، ستیل تری متیل آمونیوم برومید و سدیم دودسیل سولفات سنتز شدند. در همه موارد، ترکیب شیمیایی، شناسایی پودر، مورفولوژی و اندازه ذرات محصول نهایی توسط اسپکتروسکوپی مادون قرمز تبدیل فوریه (FTIR) ، پراش اشعه ایکس (XRD)، میکروسکوپ الکترونی روبشی (FESEM) ، آنالیز عنصری EDX و طیف سنجی UV-Vis شناسایی شدند. فعالیت فوتوکاتالیستی نانوذرات برای تخریب آلاینده های آلی (رنگدانه کنگورد) بررسی شد. آزمایش های حذف کنگورد به عنوان یک آلاینده آلی آب، فعالیت فوتوکاتالیستی و توانایی جذب سطحی اکسیدهای روی سنتز شده را نشان می دهد. سرانجام ، مقایسه نتایج حذف رنگ نشان داد که نانوذره میله ای دارای راندمان بیشتری در تخریب کنگورد با بازده 97٪ در طی 2 ساعت در pH = 8 می باشد.

Keywords [فارسی]

  • نانو ذره
  • اکسید روی
  • جذب سطحی
  • کنگورد
  • فوتوکاتالیست
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