scholarly journals Waste Utilization of Synthetic Carbon Quantum Dots Based on Tea and Peanut Shell

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Jing Zhu ◽  
Fengyuan Zhu ◽  
Xiaona Yue ◽  
Peirong Chen ◽  
Yue Sun ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Waste Utilization ◽  
Peanut Shell ◽  
High Quantum Yield ◽  
Tea Leaves ◽  
Blue Fluorescence ◽  
One Step ◽  
Waste Tea ◽  
Analytical Detection

According to the concept of waste utilization and environmental protection, carbon quantum dots (CQDs) with high quantum yield and good stability were synthesized from waste tea leaves and peanut shells by a one-step hydrothermal method. In this study, we explored the synthetic conditions, structures, and optical properties of CQDs. Their unique characteristics of emitting strong and steady blue fluorescence under excitation of ultraviolet light and possessing of plenty of hydrophilic groups on a surface conferred CQD potentials in the field of biomarkers and analytical detection.

Facile one-step synthesis and fluorescence performance study of nitrogen-doped carbon quantum dots

2021 ◽  
Vol 14 (02) ◽  
pp. 2150009
Author(s):  
Xu Huai ◽  
Weiwei Duan ◽  
Jiayu Li ◽  
Qin Zhang ◽  
Qian Dong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nitrogen Concentration ◽  
Carbon Sources ◽  
Fluorescence Emission ◽  
Carbon Quantum Dots ◽  
Performance Study ◽  
Blue Fluorescence ◽  
Nitrogen Doped ◽  
One Step ◽  
Nitrogen Doped Carbon

A facile strategy is reported to synthesize nitrogen-doped carbon quantum dots (N-CQDs) with fluorescence emission by a one-step hydrothermal treatment under different temperatures with dicyanodiamide and citric acid as precursor materials of nitrogen and carbon sources, respectively. The as-produced N-CQDs display green or blue fluorescence under the ultraviolet lamp was controlled by the reaction temperature. Consequently, the as-prepared sample reacted at 200[Formula: see text]C (N-CQDs-200), within the range of 3 nm, exhibits blue fluorescence excited at 365 nm irradiation with the maximum quantum yield (QY) of ca. 30.6%. Moreover, the N-CQDs possess rich functional groups such as nitrous groups and multiple oxygenated groups, which result in a favorable solubility in most hydrophilic solvents. From the characterization and discussion of TEM, HRTEM, FT-IR, XPS, Raman and UV-Vis, it is illustrated that the fluorescence performance was largely related to the nanomorphology, nitrogen concentration, multi-surface emission sites and various forms of transitions derived from the nitrogen doping. With the excellent fluorescence performance and the favorable solubility in solvents, the products are potentially suitable for monitoring organics.

One-Step Synthesis of Nitrogen and Chlorine Co-Doped Carbon Quantum Dots for Detection of Fe3+

NANO ◽  
2017 ◽  
Vol 12 (11) ◽  
pp. 1750135 ◽  
Author(s):  
Yin Zhong ◽  
Qi Chen ◽  
Junjian Li ◽  
Xihao Pan ◽  
Zhiwei Han ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Detection Limit ◽  
High Selectivity ◽  
Carbon Quantum Dots ◽  
High Quantum Yield ◽  
Environment Friendly ◽  
Glucosamine Hydrochloride ◽  
Quenching Efficiency ◽  
One Step ◽  
Co Doped

An environment friendly, economic and maneuverable hydrothermal method was proposed for fabrication of nitrogen and chlorine co-doped carbon quantum dots (N,Cl-CQDs). D-Glucosamine hydrochloride as the only precursor offered source of carbon, nitrogen and chlorine. As a consequent N,Cl-CQDs can emit blue luminescence and detect Fe[Formula: see text] by fluorescence response with high selectivity and sensitivity. There is a linear semilogarithmic correlation between the quenching efficiency [Formula: see text] and the concentration of Fe[Formula: see text] with a detection limit of 0.167 [Formula: see text]M. The N,Cl-CQDs exhibit a high quantum yield of 16.8% along with the fluorescence lifetime of 2.2[Formula: see text]ns. It is worth noting that the prepared N,Cl-CQDs show excellent biocompatibility and they are promising materials for sensing and biology.

One-step synthesis of renewable magnetic tea-biochar derived from waste tea leaves for the removal of Hg0 from coal-syngas

2021 ◽  
Vol 9 (4) ◽  
pp. 105313
Author(s):  
Adnan Raza Altaf ◽  
Haipeng Teng ◽  
Maoshen Zheng ◽  
Imtiaz Ashraf ◽  
Muhammad Arsalan ◽  
...  
Keyword(s):  
Tea Leaves ◽  
Coal Syngas ◽  
One Step ◽  
Waste Tea

Good's buffer derived highly emissive carbon quantum dots: excellent biocompatible anticancer drug carrier

2016 ◽  
Vol 4 (14) ◽  
pp. 2412-2420 ◽  
Author(s):  
Aneeya K. Samantara ◽  
Santanu Maji ◽  
Arnab Ghosh ◽  
Bamaprasad Bag ◽  
Rupesh Dash ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Anticancer Drug ◽  
Drug Carrier ◽  
Carbon Quantum Dots ◽  
One Step

A facile one-step approach has been developed for the synthesis of carbon quantum dots (CQDs) from Good’s buffer.

scholarly journals Carbon Quantum Dots Encapsulated Molecularly Imprinted Fluorescence Quenching Particles for Sensitive Detection of Zearalenone in Corn Sample

Toxins ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 438 ◽  
Author(s):  
Manyu Shao ◽  
Ming Yao ◽  
Sarah De Saeger ◽  
Liping Yan ◽  
Suquan Song
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Sol Gel ◽  
Carbon Quantum Dots ◽  
Detection Range ◽  
Molecularly Imprinted ◽  
Relative Standard ◽  
Sol Gel Process ◽  
One Step ◽  
Optimized Conditions

An eco-friendly and efficient one-step approach for the synthesis of carbon quantum dots (CDs) that encapsulated molecularly imprinted fluorescence quenching particles (MIFQP) and their application for the determination of zearalenone (ZEA) in a cereal sample are described in this study. CDs with high luminescence were first synthesized, and then encapsulated in the silica-based matrix through a non-hydrolytic sol-gel process. The resulting ZEA-imprinted particles exhibited not only an excellent specific molecular recognition of ZEA, but also good photostability and obvious template binding-induced fluorescence quenching. Under the optimized conditions, the fluorescence intensity of MIFQP was inversely proportional to the concentration of ZEA. By validation, the detection range of these fluorescence quenching materials for ZEA was between 0.02 and 1.0 mg L−1, and the detection limit was 0.02 mg L−1 (S/N = 3). Finally, the MIFQP sensor was successfully applied for ZEA determination in corn with recoveries from 78% to 105% and the relative standard deviation (RSD %) was lower than 20%, which suggests its potential in actual applications.

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