Synthesis of fluorescent carbon quantum dots from aqua mesophase pitch and their photocatalytic degradation activity of organic dyes |
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| Affiliation: | 1. Department of Chemical Engineering, Faculty of Engineering, University of Kashan, 87317-53153, Kashan, Iran;2. Laboratory of Advanced Materials and Nanotechnology, University of Kashan, 87317-53153, Kashan, Iran;3. Modeling and Simulation Centre, Faculty of Engineering, University of Kashan, 87317-53153, Kashan, Iran;1. School of Chemistry, Faculty of Basic Sciences, Shoolini University, Solan, Himachal Pradesh, 173212, India;2. Himalayan Centre for Excellence in Nanotechnology, Shoolini University, Solan, HP, 173229, India;3. Department of Environmental Health Engineering, Faculty of Health, Sabzevar University of Medical Sciences, Sabzevar, Iran;4. Department of Engineering, Kashmar Branch, Islamic Azad University, PO Box 161, Kashmar, Iran;5. Enhanced Composites and Structures Center, School of Aerospace, Transport and Manufacturing, Cranfield University, Bedfordshire, MK43 0AL, UK;1. Department of Chemistry, College of Science, University of Sulaimani, Qliasan Street, Sulaimani City, Kurdistan Region, Iraq;2. Komar University of Science and Technology, KUST, Qliasan St, Sulaimani City, Kurdistan Region, Iraq;3. Department of Chemistry, College of Education, University of Salahadin, Kirkuk Street, Erbil, Kurdistan Region, Iraq;1. National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China;2. Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, 310018, China |
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| Abstract: | A synthesis strategy of fluorescent carbon quantum dots (CQDs) with high quantum yield (QY) using aqua mesophase pitch (AMP) as the carbon source has been developed via the hydrothermal method in this study. The hydrothermal temperature and soaking time have important effects on the morphology and QY of CQDs. As-prepared CQDs at 120 °C holding for 24 h (CQDs-120-24) have the uniform size of about 2.8 nm, and the QY can reach 27.6%. The obtained CQDs are successfully modified with ammonia and thionyl chloride, respectively, and they exhibit an excellent photocatalytic performance on degrading rhodamine B (Rh B), methyl blue (MB) and indigo carmine (IC). Importantly, the degradation percentage of N-CQDs on Rh B under natural light for 4 h reaches 97% with the degradation rate constant of 0.02463 min−1 and it can maintain 93% after repetitively used 5 times. The results indicate that these as-prepared CQDs have the potential application in degrading organic dyes. |
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| Keywords: | Carbon quantum dots Aqua mesophase pitch Photocatalytic performance Degradation rate |
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