بررسی خواص فتوکاتالیستی نانوذرات اکسید تیتانیم و اکسید تیتانیم-4 درصد وزنی اکسید کادمیم جهت تخریب فتوکاتالیستی متیلن بلو

نویسندگان

مرکز تحقیقات مواد پیشرفته، دانشکده مهندسی مواد، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف‌آباد، ایران

چکیده

آلودگی آب‌ها یکی از معضلات بزرگ جوامع بشری است و نیاز به یافتن راه‌های جدید برای حذف این آلاینده‌ها در سال‌های اخیر بسیار موردتوجه قرار گرفته است. یکی از روش‌ها استفاده از فتوکاتالیست‌ها است. در این پژوهش نانوذرات اکسید تیتانیم و اکسید تیتانیم-اکسید کادمیم (TiO2-CdO) به‌عنوان نانو فتوکاتالیست با روش سل-ژل تهیه شدند. نمونه‌های تولید شده برای تخریب رنگ متیلن بلو تحت تابش نور فرابنفش مورداستفاده قرار گرفت. برای مشخصه‌یابی نمونه‌های تهیه شده از آزمون‌های طیف‌سنجی پراش پرتو ایکس، میکروسکوپ الکترون روبشی نشر میدانی، طیف‌سنجی پراش انرژی پرتو ایکس و طیف‌سنجی مرئی فرابنفش استفاده شد. نتایج ریزساختاری نشان داد نانوذرات با ابعاد ۱۸ تا ۳۲ نانومتر به این روش تهیه شدند. نتایج پراش پرتو ایکس نشان داد فاز اصلی ایجاد شده آناتاز است. نانو‌کامپوزیت TiO2-4%CdO فعالیت فتوکاتالیستی بیشتری در مقایسه با اکسید تیتانیم خالص از خود نشان داد. همچنین تأثیر پارامترهای مؤثر بر فعالیت فتوکاتالیستی از جمله pH، زمان تابش و مقدار پودر مورد بررسی قرار گرفت. بررسی‌ها نشان داد در pH=9، زمان 75 دقیقه و استفاده از 0/02 گرم فتوکاتالیست TiO2-4%CdO، بیشینه فعالیت فتوکاتالیستی در حدود 92 درصد بود. 

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Photocatalytic Properties of TiO2 and TiO2-4wt.%CdO Nanoparticles for Degradation of Methylene Blue

نویسندگان [English]

  • A. Azimi-Fouladi
  • S.A. Hasanzadeh-Tabrizi
چکیده [English]

Water pollution is one of the big problems of human societies, and the need to find new ways to remove these pollutants has been given much attention in recent years. One of the methods is the use of photocatalysts. In this research, TiO2 and TiO2-CdO nanoparticles were prepared by a sol-gel method as nano photocatalysts. The produced samples have been used to degrade methylene blue under UV light. To characterize the prepared samples, X-ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), X-ray Energy Diffraction Spectroscopy (EDS), and Ultraviolet-Visible Spectroscopy (UV-Vis) were used. Microstructural results revealed nanoparticles with dimensions of 18 to 32 nm. XRD results showed that the main phase formed was the anatase. TiO2-4 wt.% CdO nanocomposite showed more photocatalytic activity compared to pure TiO2. Also, the effect of pH, irradiation time, and amount of powder on photocatalytic activity was investigated. The results showed that at pH=9, time of 75 min, and using 0.02 g TiO2-4 wt.% CdO photocatalyst, the maximum photocatalytic activity of about 92 % was obtained.
 

کلیدواژه‌ها [English]

  • Photocatalyst
  • nanocomposite
  • TiO2-CdO
  • Sol-gel
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