scholarly journals Ion-Imprinted Polymer Modified with Carbon Quantum Dots as a Highly Sensitive Copper(II) Ion Probe

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1376
Author(s):  
Zhiming Wang ◽  
Cuo Zhou ◽  
Shunwei Wu ◽  
Chunyan Sun
Keyword(s):  
Quantum Dots ◽  
Copper Ions ◽  
Fluorescent Sensor ◽  
Hydrothermal Process ◽  
Copper Ion ◽  
Fluorescence Analysis ◽  
Carbon Quantum Dots ◽  
General Strategy ◽  
Surface Imprinting Technique ◽  
Ion Imprinted

Fluorescence analysis technology and ion imprinting technology are combined to prepare a copper ion fluorescence sensor. Carbon quantum dots (CQDs), with a quantum yield of 79%, were synthesized by a hydrothermal process using citric acid as the carbon source. The prepared CQDs, acting as the fluorophore, were grafted onto the surface of an SBA-15 mesoporous molecular sieve by an amidation reaction. Then, the fluorescent sensor CQDs@Cu-IIP was prepared using a surface imprinting technique with the modified SBA-15 as the substrate, copper ions as a template, tetraethoxysilane as the crosslinker, and 3-aminopropyl-3-ethoxysilane as the functional monomers. The sensor showed strong fluorescence from CQDs and high selectivity due to the presence of Cu(II)-IIP. After the detection conditions were optimized, the fluorescence intensity of the sensor had good linearity with Cu(II) concentration in a linear range of 0.25–2 mg/L and 3–10 mg/L. This CQDs@Cu-IIP was applied to the determination of traces Cu(II) in real water samples and good recoveries of 99.29–105.42% were obtained. The present study provides a general strategy for fabricating materials based on CQDs for selective fluorescence detection of heavy metals.

scholarly journals Integrated Cascade Biorefinery Processes to Transform Woody Biomass Into Phenolic Monomers and Carbon Quantum Dots

2021 ◽  
Vol 9 ◽  
Author(s):  
Xue Chen ◽  
Jiubin Zhu ◽  
Wenlu Song ◽  
Ling-Ping Xiao
Keyword(s):  
Quantum Dots ◽  
High Performance ◽  
Fluorescent Sensor ◽  
Hydrothermal Process ◽  
Value Added ◽  
Carbon Quantum Dots ◽  
High Yield ◽  
Heavy Metal Cations ◽  
Catalytic Hydrogenolysis ◽  
Cost Efficient

A novel cascade biorefinery strategy toward phenolic monomers and carbon quantum dots (CQDs) is proposed here via coupling catalytic hydrogenolysis and hydrothermal treatment. Birch wood was first treated with catalytic hydrogenolysis to afford a high yield of monomeric phenols (44.6 wt%), in which 4-propanol guaiacol (10.2 wt%) and 4-propanol syringol (29.7 wt%) were identified as the two major phenolic products with 89% selectivity. An available carbohydrate pulp retaining 82.4% cellulose and 71.6% hemicellulose was also obtained simultaneously, which was further used for the synthesis of CQDs by a one-step hydrothermal process. The as-prepared CQDs exhibited excellent selectivity and detection limits for several heavy metal cations, especially for Fe3+ ions in an aqueous solution. Those cost-efficient CQDs showed great potential in fluorescent sensor in situ environmental analyses. These findings provide a promising path toward developing high-performance sensors on environmental monitoring and a new route for the high value-added utilization of lignocellulosic biomass.

A green synthetic route for the surface-passivation of carbon dots as an effective multifunctional fluorescent sensor for the recognition and detection of toxic metal ions from aqueous solution

2019 ◽  
Vol 11 (4) ◽  
pp. 490-506 ◽  
Author(s):  
K. Radhakrishnan ◽  
P. Panneerselvam ◽  
M. Marieeswaran
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Carbon Dots ◽  
Surface Passivation ◽  
Fluorescent Sensor ◽  
Toxic Metal ◽  
Carbon Quantum Dots ◽  
Synthetic Route ◽  
One Pot ◽  
Hydrothermal Methods

In this work, a green synthetic route was used to create a number of surface passivated fluorescent carbon quantum dots, which are explored as promising sensing probes, via facile one-pot hydrothermal methods.

Polyamine-Functionalized Carbon Quantum Dots as Fluorescent Probes for Selective and Sensitive Detection of Copper Ions

2012 ◽  
Vol 84 (14) ◽  
pp. 6220-6224 ◽  
Author(s):  
Yongqiang Dong ◽  
Ruixue Wang ◽  
Geli Li ◽  
Congqiang Chen ◽  
Yuwu Chi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescent Probes ◽  
Copper Ions ◽  
Carbon Quantum Dots ◽  
Sensitive Detection

Potentiality of carbon quantum dots derived from chitin as a fluorescent sensor for detection of ClO−

2020 ◽  
Vol 157 ◽  
pp. 105111 ◽  
Author(s):  
Qiwen Jiang ◽  
Yi jing ◽  
Yeyan Ni ◽  
Ruoshi Gao ◽  
Pingyan Zhou
Keyword(s):  
Quantum Dots ◽  
Fluorescent Sensor ◽  
Carbon Quantum Dots

scholarly journals Acid-Free Hydrothermal-Extraction and Molecular Structure of Carbon Quantum Dots Derived from Empty Fruit Bunch Biochar

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3356
Author(s):  
Norhanisah Jamaludin ◽  
Tong Ling Tan ◽  
Alif Syafiq Kamarol Zaman ◽  
Amir Reza Sadrolhosseini ◽  
Suraya Abdul Rashid
Keyword(s):  
Molecular Structure ◽  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Quantum Dots ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
Hydrothermal Process ◽  
Carbon Quantum Dots ◽  
Empty Fruit Bunch ◽  
Transmission Electron

Carbon quantum dots (CQD) have great potential to be used in various applications due to their unique electrical and optical properties. Herein, a facile, green and eco-friendly hydrothermal method for the preparation of carbon quantum dots was achieved using empty fruit bunch (EFB) biochar as a renewable and abundant carbon source. In the current study, the role of the hydrothermal process was observed and studied by comparing the morphology and optical characteristics of CQD obtained from EFB biochar. Interestingly, based on the high-resolution transmission electron microscopy (HRTEM) result, a considerably similar carbon quantum dots structure can be observed for the EFB biochar sample, showing the similar size and distribution of CQD. To further discuss the extraction of CQD from EFB biochar, a mechanism based on hydrothermal-induced extraction of CQD is proposed. The optimal structure of CQD deduced by density functional theory (DFT) in energy and dipole momentum was about 2057.4905 Hatree and 18.1699 Debye, respectively. This study presents a practical experimental approach in elucidating the molecular structure of photoluminescence CQD based on the Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) results.

A novel fluorescent sensor for water in organic solvents based on dynamic quenching of carbon quantum dots

2018 ◽  
Vol 42 (23) ◽  
pp. 18787-18793 ◽  
Author(s):  
Jianfei Wei ◽  
Ye Yuan ◽  
Haikuo Li ◽  
Dan Hao ◽  
Chenying Sun ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Organic Solvents ◽  
Fluorescent Sensor ◽  
Carbon Quantum Dots ◽  
Dynamic Quenching

A novel fluorescent sensor for water in organic solvents was proposed based on dynamic quenching of carbon quantum dots.

Cuttlefish ink-based N and S co-doped carbon quantum dots as fluorescent sensor for highly sensitive and selective para-nitrophenol detection

2021 ◽  
Author(s):  
Xiaotong Huang ◽  
Chunli Yang ◽  
Yingxin Chen ◽  
Zebin Zhu ◽  
Lihua Zhou
Keyword(s):  
Quantum Dots ◽  
Organic Synthesis ◽  
Fluorescent Sensor ◽  
Environmental Problems ◽  
Carbon Quantum Dots ◽  
Raw Material ◽  
Highly Sensitive ◽  
Co Doped

Para-nitrophenol (PNP) is an important raw material for organic synthesis and its extensive use has produced a series of environmental problems. Here, we develop a highly sensitive and selective fluorescent...

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