دوپینگ نانوذرات تجاری TiO2 (UV100) با اوره و بررسی فعالیت نوری آن در حذف یک آلاینده محیط زیست (اسید قرمز 27) تحت تابش نور مرئی
محورهای موضوعی : راه حل های موثر و قابل توسعه برای کنترل و حذف آلودگی های محیطی
1 - دانش‌آموخته دکتری شیمی کاربردی، دانشکده شیمی، واحد تهران شمال، دانشگاه آزاد اسلامی، تهران، ایران
کلید واژه: TiO2 (UV100), دوپینگ با اوره, فعاليت فوتوكاتاليزوري, اسید قرمز 27,
چکیده مقاله :
در این تحقیق TiO2 تجاری به نام UV100به روش تلقیح با اوره دوپه شده و فعالیت فوتوکاتالیزوری آن تحت تابش نور مرئی مورد ارزیابی قرار گرفته است. مشخصات نانوذرات دوپه شده بوسیله تکنیکهای پراش اشعه X (XRD)، اسپکتروسکوپی پراش انعکاسی (DRS)، BET و XPS بررسی شده است. فعالیت فوتوکاتالیزوری نانوذرات TiO2 (UV100) دوپه شده با اوره با نسبتهای وزنی مختلف و دماهای کلسیناسیون متفاوت در حذف فوتوکاتالیزوری اسید قرمز 27 که یک نوع رنگ مونوآزوی نساجی است مورد ارزیابی قرار گرفته است. نتایج نشان میدهد دوپینگ اوره سبب افزایش فعالیت فوتوکاتالیزوری نانوذرات TiO2 (UV100) تحت تابش نور مرئی می‌شود. این مسئله ناشی از کاهش شکاف طیف نانوذرات تحت تاثیر دوپینگ اوره می‌باشد. TiO2 (UV100) دوپه شده با اوره به نسبت (1:1) و در دمای کلسیناسیون oC350 بیشترین فعالیت فوتوکاتالیزوری را نسبت به سایر نانوذرات دوپه شده نشان میدهد. حذف AR27 تحت تابش نور مرئي به مدت 50 دقیقه در حضور نانوذرات TiO2 (UV100) خالص و TiO2 (UV100) دوپه شده به ترتیب 65 و %100 است.
In this study, commercial TiO₂ (UV100) was doped with urea using an impregnation method, and its photocatalytic activity was evaluated under visible light irradiation. The characteristics of the doped nanoparticles were analyzed using X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), BET, and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of urea-doped TiO₂ (UV100) with various weight ratios and calcination temperatures was assessed through the photocatalytic degradation of C.I. Acid Red 27, a monoazo textile dye. The results indicate that urea doping enhances the photocatalytic activity of TiO₂ (UV100) under visible light, primarily due to a reduction in the nanoparticles’ energy band gap. The highest photocatalytic activity was observed in TiO₂ (UV100) doped with urea at a 1:1 ratio and calcined at 350°C. Under visible light irradiation for 50 min, the removal efficiency of AR27 was 65% with pure TiO₂ (UV100) and 100% with doped TiO₂ (UV100).
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