سنتز نقاط کوانتومی کربن (CQDs) از پوست سخت گردو با روش هیدروترمال

نوع مقاله : مقاله پژوهشی

نویسندگان

پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران، ایران

چکیده

در این پژوهش نقاط کوانتومی کربنی (CQDs) زیست ­سازگار به­ صورت تک مرحله ­ای به روش هیدروترمال از پوست گردو به­ عنوان منبع کربنی تهیه شده است. اندازه ذرات، شیمی سطح و ساختار کریستالی نقاط کوانتومی کربنی با استفاده از آنالیزهای FTIR, DLS و XRD و ویژگی­ های نوری ماده با استفاده از آنالیزهای جذبی و فلورسانسی بررسی شد. نتایج به دست آمده نشان داد که نقاط کوانتومی کربن سنتز شده از توزیع اندازه ذرات مناسبی برخوردار بوده و میانگین اندازه ذرات 5/7±2/5 بوده است. البته بیشترین توزیع اندازه ذرات مربوط به 5 تا 6 نانومتر است. همچنین اثر دما بر کربونیزاسیون اولیه بررسی شد که با افزایش دمای کوره پیرولیز درصد کربن نیز افزایش پیدا می ­کند که درصد کربن در دمای 150 درجه 46 درصد وزنی و در دمای 450 درجه 83 درصد وزنی بوده است. البته تفاوت وزنی کربن تولیدی بین دماهای 350 و 450 درجه بسیار اندک است و با در نظر گرفتن افزایش 100 درجه‌ای دما، دمای 350 درجه به عنوان دمای مناسب برای کربونیزاسیون اولیه پوسته گردو در نظر گرفته شد. نتایج اسپکتروم جذبی و فلورسانسی نشان داده که در طول موج 238 یک پیک جذبی از نمونه مشاهده می­ شود و نمونه نشر فلورسانی مطلوبی در طول موج 402 نانومتر از خود نشان می­ دهد. با توجه به نتیجه ­ی طیف  FT-IRبررسی شده سطح کوانتوم­ دات­ های کربنی از گروه ­های عاملی آبدوستی همچون گروه ­های هیدروکسیل، کربونیل و آمین پوشیده شده است و بر همین اساس انتظار می­ رود نانو ذرات سنتز شده پراکندگی بالایی در آب نشان دهند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Synthesis of quantum carbon dots (CQDs) from hard walnut skin by hydrothermal method

نویسندگان [English]

  • Afsaneh Shahbazi
  • elham dall
SBU
چکیده [English]

In this study, biocompatible carbon quantum dots (CQDs) were prepared in a single step by hydrothermal method from walnut skin as a carbon source. Particle size, surface chemistry and crystal structure of carbon quantum dots were investigated using FTIR, DLS and XRD analyses and the optical properties of the material were investigated using absorption and fluorescence analyses. The results showed that the quantum dots of synthesized carbon had a good particle size distribution and the average particle size was 5.7 ± 2.5. Also, the effect of temperature on initial carbonization was investigated, which with increasing the temperature of the pyrolysis furnace, the percentage of carbon also increased, which was 46% by weight at 150 °C and 83% by weight at 450 ° C. Due to the fact that, the difference in weight of carbon produced between temperatures of 350 and 450 degrees is very small, and considering the increase of 100 degrees, the temperature of 350 degrees was considered as a suitable temperature for the initial carbonization of walnut shell. The results of the absorption spectrum and fluorescence show that at the 238 wavelength an absorption peak of the sample is observed and the sample shows good fluorescence scattering at the wavelength of 402 nm. According to the results of the studied FT-IR spectrum, the quantum surface of carbon dots is covered by hydrophilic functional groups such as hydroxyl, carbonyl and amine groups, and based on this, the synthesized nanoparticles are expected to show high dispersion in water.

کلیدواژه‌ها [English]

  • Carbon Quantum dot
  • Synthesis
  • Walnut shell
  • Hydrothermal
  • Carbonization

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 55، شماره 3
خرداد 1402
صفحه 493-504

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