Synthesis of Carbon Nanodots from Smoked Tobacco Molasses via Chemical Oxidation and Extraction P
| dc.contributor.author | Amal Yaseen | |
| dc.contributor.author | Aya Ataya | |
| dc.contributor.author | Leena Rifai | |
| dc.date.accessioned | 2023-07-16T10:15:15Z | |
| dc.date.available | 2023-07-16T10:15:15Z | |
| dc.date.issued | 2023-07-16 | |
| dc.description.abstract | Abstract Carbon Nanodots (CNDs) as an emerging new class of carbon Nano-allotropes have several attractive properties such as; small size (less than 10 nm), good photoluminescence, low toxicity, excellent water solubility, etc. These outstanding features make CNDs good candidates in different fields and applications as sensors, photo catalysts, anticancer, antimicrobial, etc. In this work, CNDs will be synthesized from used (smoked) tobacco molasses (the tobacco of nargileh) through extraction and chemical oxidation methods. The produced CNDs will be characterized by different techniques such as; UV-Vis, FT-IR, Fluorescence spectroscopy, AFM, XPS and Raman. It is intended to use these CNDs in environmental applications such as photo degradation of pollutant dyes or sensing of harmful elements and species. As a result, two types of carbon nanodots have been synthesized from smoked tobacco molasses and named based on the method of synthesis: D-CNDs, which stands for direct extraction method, and O-CNDs D-CNDs have a quantum yield of 1.55% and a wide range of particle sizes, with an average of 10.7 nm. While O-CNDs exhibit a higher quantum yield of 3.1% and a narrow range of particle size with an average of 2.7 nm. The outcome product yield is 71%, which is relatively high. The synthesized CNDs have been used as sensing for ions in water based on fluorescence quenching. The CNDs were selective to Fe+3 compared to other ions such as (Fe2+, Cu2+, Mn2+, Hg2+, Ni+2, and Pb+2). Sensitivity and efficiency of both CNDs have been examined with regard to Fe+3 to find that O-CNDs have better-sensing results compared to D-CNDs due to their surface oxygenated groups and negative charge. In comparison O-CNDs sensing range (0-50) μM, sensitivity 0.0045 μM-1, LOD 3.9 μM, LOQ 13 μM, and efficiency of 76.6% at 400) μM while D-CNDs have sensing range (0-50) μM, sensitivity 0.0029 μM-1, LOD 7.2 μM, LOQ 24 μM, and efficiency 65% at 400 μM. | |
| dc.identifier.uri | https://hdl.handle.net/20.500.11888/18287 | |
| dc.language.iso | en | |
| dc.supervisor | Dr. Shadi Sawalha | |
| dc.title | Synthesis of Carbon Nanodots from Smoked Tobacco Molasses via Chemical Oxidation and Extraction P |
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