تطبيقات التحفيز الضوئي للمركبات النانوية TiO2-CQDs المحضرة بالطرق البيولوجية
DOI:
https://doi.org/10.21123/bsj.2024.9549الكلمات المفتاحية:
الاناتاز، نقاط الكاربون المكممة، المجهر الالكتروني االباعث للمجال، المجهر الالكتروني النافذ عالي الدقة، ثنائي اوكسيد التيتانيوم، حيود الاشعة السينيةالملخص
في هذه الدراسة ، تم تصنيع CQDs بالطريقة الخضراء بأستخدام عصير البرتقال والايثانول تم خلطها عند درجة حرارة منخفضة نسبيا بواسطة عملية الكربنة الحرارية المائية، وتم تحضير حبيبات TiO2 بواسطة طريقة .sol-gel وكذلك تم تحضير المركبات النانوية و TiO2-CQDs بنسب وزنية مختلفة بواسطة الخلط الانزلاقي والمعالجة الحرارية. أظهرت نتائج FESEM تكوين مواد نانوية بأشكال مختلفة وبمعدل حجم حبيبي صغير كشف المجهر الإلكتروني النافذ عالي الدقة أن TiO2 طور (anatase) يتجمع في أشكال وأحجام كروية في الغالب أقل من 15 nm. كان لنقاط الكميات الكمية قطر موحد نسبيًا، وشكل كروي ذو بنية بلورية عالية، وحجم أقل من 2 nm. تُظهر أطياف FTIR للمواد النانوية المحضرة وجود النطاق العريض عند (450–4000) cm-1 يتوافق مع اهتــزاز التمدد لمجموعات الهيدروكسيل المنتهية في العينات. أظهرت نتائج التحليل الطيفي المرئي للأشعة فوق البنفسجية أن امتصاصية المتراكبات النانوية (TiO2-CQD) تزداد مع زيادة نسبة CQDs ، وكانت قيمة فجوة الطاقة البصرية 3.14 eV و 3.07 eV للمواد TiO2 و CQDsعلى التوالي. وانخفضت قيم فجــوة الطاقة للــمتراكبات TiO2-CQDs النانــوية مع زيادة معدل CQDs ضمن المدى 1.85–2.72) eV ) . تم اختبار أداء التحفيز الضوئي عن طريق تحلل صبغات الميثيلين الأزرق (MB) والميثيل البرتقالي (MO) تحت تأثير إشعاع الأشعة الفوق البنفسجية. أظهرت النتائج أن جميع المواد المتراكبة المحضرة بنسب مختلفة كانت لها كفاءة تحفيزية ضوئية أعلى من TiO2 NPs ، وأن كفاءة التحفيز الضوئي تزداد مع زيادة نسبة . CQDs كانت كفاءة التحلل لكل من الميثيلين الأزرق (MB) والميثيل البرتقالي (MO) عند 84% و % 39 عند240 دقيقة على التوالي.
Received 19/09/2023
Revised 18/02/2024
Accepted 20/02/2024
Published Online First 20/09/2024
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