Putri, Ismawati (2024) Studi dan Karakterisasi Karbon Dot Doping Nitrogen (N-CDs) untuk Mendeteksi Ion Logam Berat. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pencemaran air yang disebabkan oleh kontaminasi logam berat merupakan salah satu ancaman global yang serius. Pendeteksian adanya logam berat dalam air dapat dilakukan menggunakan metode teknik fotoluminesensi dengan memanfaatkan bahan fluoresensi. Karbon dot (CDs) merupakan nanomaterial berbasis karbon fluoresensi yang bersifat non toksik, biokompatibel, dan sensitif terhadap ion logam berat sehingga dapat digunakan untuk menggantikan semikonduktor quantum dots. Penambahan doping Nitrogen pada CDs dapat meningkatkan sifat optiknya. N-CDs berbahan dasar Citric Acid dan Carbonyl Diamide disintesis dengan menggunakan teknik iradiasi gelombang mikro. N-CDs dikarakterisasi Transmission Electron Microscope, Fourier Transform Infrared Spectroscopy, dan Raman Spectroscopy untuk mengetahui strukturnya. Untuk mengetahui sifat optiknya dilakukan karakterisasi Ultraviolet Visible dan fotoluminesensi. N-CDs memiliki ukuran yang dominan sebesar 2 nm dengan bentuk kuasi-bola yang seragam dan tersebar dengan baik. N-CDs diaplikasikan untuk mendeteksi ion logam berat Co2+ dan Fe3+ dengan konsetrasi 10, 20, 30, 40, dan 50 ppm. Hasil deteksi menunjukkan perubahan intensitas fluoresensi seiring dengan bertambahnya konsentrasi ion logam berat. Perubahan tersebut disebabkan oleh adanya interaksi antara ion logam berat dengan gugus fungsi permukaan N-CDs. Semakin banyak ion logam berat yang berinteraksi dengan N-CDs menyebabkan semakin menurun intensitas floresensi (pemadaman fluoresensi). Adanya perubahan intensitas fluoresensi menunjukkan bahwa N-CDs dapat digunakan untuk mendeteksi ion logam berat.
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Water pollution caused by heavy metal contamination is one of the serious global threats. Detection of heavy metal in water can be performed using photoluminescence techniques with the aid of fluorescent materials. Carbon dots (CDs) are fluorescent carbon-based nanomaterials that are non-toxic, biocompatible, and sensitive to heavy metal ions, making them suitable substitutes for semiconductor quantum dots. Nitrogen doping in CDs can enhance their optical properties. Nitrogen-doped CDs (N-CDs) based on Citric Acid and Carbonyl Diamide were synthesized using microwave irradiation techniques. The N-CDs were characterized by Transmission Elctron Microscope, Fourier Transform Infrared Spectroscopy, and Raman Spectroscopy. Their optical properties were characterized using Ultraviolet-Visible and photoluminescence spectroscopy. The N-CDs predominantly have a size of 2 nm with a uniform quasi-spherical shape and are well dispersed. N-CDs were applied for detect heavy metal ions Co2+ and Fe3+ at concentrations of 10, 20, 30, 40, and 50 ppm. The detection results showed changes in fluorescence intensity with increasing concentrations of heavy metal ions. These chanes are due to the interaction between heavy metal ions and the surface functional groups of the N-CDs. The more heavy metal ions that interact with N-CDs, the greater decrease in fluorescence intensity (fluorescence quenching). The change in fluorescence intensity indicates that N-CDs can be used to detect heavy metal ions.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Heavy Metal Ions Detection, Nitrogen-Doped Carbon Dots, Photoluminescence, Deteksi Ion Logam Berat, Karbon Dot Doping Nitrogen, Fotoluminesensi |
| Subjects: | Q Science > QC Physics > QC475 Photoluminescence |
| Divisions: | Faculty of Natural Science > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | ISMAWATI PUTRI |
| Date Deposited: | 19 Jul 2024 03:53 |
| Last Modified: | 19 Jul 2024 03:53 |
| URI: | http://repository.its.ac.id/id/eprint/108487 |
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