اثر غلظت‌های مختلف عصاره رزماری بر فاز و ریخت نانوذرات اکسید روی و کارایی آن در تخریب رنگ متیلن‌بلو

نویسندگان

دانشکده شیمی، دانشگاه صنعتی اصفهان، اصفهان، ایران

چکیده

در این پژوهش، نانوذرات اکسید روی با مورفولوژی شبه کروی به‌روش سل- ژل اصلاح شده و با استفاده از عصاره رزماری به‌عنوان عامل پایدار کننده نانوذرات سنتز شد. اثر میزان عصاره رزماری و دمای کلیسنه شدن بر اندازه و شکل ذرات مورد بررسی قرار گرفت. نمونه‌ها با الگوی پراش پرتو ایکس (XRD)، طیف‌سنجی مادون قرمز (FT– IR)، میکروسکوپ الکترونی روبشی (SEM) و آنالیز عنصری تفکیک انرژی پرتو ایکس (EDX) شناسایی شده‌اند. نتایج پراش پرتو ایکس ساختار هگزاگونال (فاز ورتزیت اکسید روی) را نشان داد. بنابر نتایج میکروسکوپ الکترونی روبشی نانوذرات کروی اکسید روی با اندازه تقریبی 18 نانومتر با استفاده از 75 میلی‌لیتر عصاره رزماری به‌دست آمد. فعالیت فوتوکاتالیتیکی نانوذرات اکسید روی بهینه سنتز شده برای تخریب محلول‌ رنگی متیلن‌بلو مورد بررسی قرار گرفت. نتایج بیانگر 96/87 درصد تخریب رنگدانه طی ۱۳۵ دقیقه بود که نشان‌دهنده کارایی مناسب نانوذرات سنتز شده در فرایند تخریب فوتوکاتالیتیکی رنگدانه‌ها بودند.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Different Concentrations of Rosemary Extract on the Phase and Morphology of Zno Nanoparticles and Its Efficiency on Degradation of Methylene Blue Dye

نویسندگان [English]

  • F. Davar
  • Z. Enteshari
Deprtment of Chemistry, Isfahan University of Technology, Isfahan, Iran.
چکیده [English]

In this research, Zinc oxide nanoparticles with semi-spherical morphology were synthesized by modified sol-gel method using rosemary extract as a stabilizing agent. The effect of the amount of rosemary extract and calcination temperature on size and shape of the particles was investigated. The samples were characterized by X-ray diffraction (XRD), infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and elemental analysis (EDX). X-ray diffraction results showed hexagonal structure (wurtzite phase) of zinc oxide. According to the SEM results semi-spherical nanoparticles of 18 nm in size were obtained using 75 ml of rosemary extract. The photocatalytic activity of the modified ZnO nanoparticles was investigated for degradation of the methylene blue dye solution. The results showed 96.87% of dye degradation in the 135 min that confirmed suitable efficiency of as-synthesized nanoparticles in the photocatalytic degradation process of dyes.

کلیدواژه‌ها [English]

  • ZnO nanoparticles
  • Modified Sol-gel
  • Nano photocatalyst
  • Rosemary extract
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