Potential prospects for carbon dots as a fluorescence sensing probe for metal ions

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90526-90536 ◽  
Author(s):  
Savita Chaudhary ◽  
Sandeep Kumar ◽  
Bhawandeep Kaur ◽  
S. K. Mehta
Keyword(s):  
Metal Ions ◽  
Carbon Dots ◽  
Aqueous Media ◽  
Fluorescence Sensing ◽  
Emission Properties ◽  
Sensing Applications

The well defined emission properties of CQDs have encouraged further investigation of their prospects in chemo-sensing applications for the identification of Cr3+ ions in aqueous media.

Carbon dots: synthesis, formation mechanism, fluorescence origin and sensing applications

2019 ◽  
Vol 21 (3) ◽  
pp. 449-471 ◽  
Author(s):  
Meng Li Liu ◽  
Bin Bin Chen ◽  
Chun Mei Li ◽  
Cheng Zhi Huang
Keyword(s):  
Green Chemistry ◽  
Green Synthesis ◽  
Formation Mechanism ◽  
Carbon Dots ◽  
Recent Progress ◽  
Fluorescence Sensing ◽  
Sensing Applications

We systematically summarize the recent progress in the green synthesis and formation mechanism of CDs with the hope to provide guidance for developing CDs with the concept of green chemistry. In addition, we discuss and organize the current opinions on the fluorescence origin of CDs and the latest progress of CDs in fluorescence sensing applications.

scholarly journals Eco-Friendly Sustainable Fluorescent Carbon Dots for the Adsorption of Heavy Metal Ions in Aqueous Environment

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 315 ◽  
Author(s):  
Musa Yahaya Pudza ◽  
Zurina Zainal Abidin ◽  
Suraya Abdul Rashid ◽  
Faizah Md Yasin ◽  
A. S. M. Noor ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Carbon Dots ◽  
Heavy Metal Ions ◽  
Active Sites ◽  
Adsorption Process ◽  
Coefficient Of Determination ◽  
Aqueous Environment ◽  
Order Kinetic ◽  
Sensing Applications

The materials and substances required for sustainable water treatment by adsorption technique, are still being researched widely by distinguished classes of researchers. Thus, the need to synthesize substances that can effectively clean up pollutants from the environment cannot be overemphasized. So far, materials in bulk forms that are rich in carbon, such as biochar and varieties of activated carbon have been used for various adsorptive purposes. The use of bulk materials for such purposes are not efficient due to minimal surface areas available for adsorption. This study explores the adsorption task at nano dimension using carbon dots (CDs) from tapioca. The properties of carbon structure and its influence on the adsorptive efficacy of carbon nanoparticles were investigated by energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), high resolution transmission electron microscopy (HrTEM), and atomic force microscopy (AFM). The results implied carbon present in CDs are good adsorbents for effective adsorption of heavy metal ions (lead) with removal efficiency of 80.6% in aqueous environment. The adsorption process as explored by both Langmuir and Freundlich isotherms have proven favorability of the adsorption process. Langmuir form two and three have correlation coefficients R2 at 0.9922 and 0.9912, respectively. The Freundlich isotherm confirms CDs as having defined surface heterogeneity and the exponential distribution of active sites. The adsorption of lead unto CDs obeyed the second order kinetic model with coefficient of determination, R2 of 0.9668 and 0.9996 at an initial lead concentration of 20 mg/L and 100 mg/L, respectively. The findings validated the efficiency of CDs derived from tapioca as an excellent material for further utilization in the environmental fields of wastewater pollution detection and clean up, bio-imaging, and chemical sensing applications.

One-pot synthesis of highly fluorescent Fe2+-doped carbon dots for a dual-emissive nanohybrid for the detection of zinc ions and histidine

2018 ◽  
Vol 42 (16) ◽  
pp. 13651-13659 ◽  
Author(s):  
Bingyan Han ◽  
Tingting Peng ◽  
Mingbo Yu ◽  
Chen Chi ◽  
Ying Li ◽  
...  
Keyword(s):  
Metal Ions ◽  
Carbon Dots ◽  
Zinc Ions ◽  
Fluorescence Sensing ◽  
One Pot ◽  
One Pot Synthesis ◽  
The Common ◽  
Carbon Resource ◽  
Doped Carbon Dots ◽  
Fluorescent Carbon Dots

Fe2+ was confirmed to be the only definitive one of the common metal ions to synthesize the highly fluorescent carbon dots with proline as the carbon resource at 80 °C for visual fluorescence sensing Zn2+ and histidine, respectively.

PREDICTIVE SIMULATION AND OPTIMIZATION ORIENTED MODELING FOR THE EXTRACTION OF METAL IONS FROM SOLUTIONS INTO A NOVEL BIS-SCHIFF BASE

2019 ◽  
pp. 1-8
Author(s):  
F. S. Nworie ◽  
S. O. Ngele ◽  
J. C. Onah
Keyword(s):  
Metal Ions ◽  
Metal Concentration ◽  
Acid Concentration ◽  
Aqueous Media ◽  
Industrial Effluents ◽  
Ligand Concentration ◽  
Simulation And Optimization ◽  
Chemometric Technique ◽  
Model Equations ◽  
Level Of Significance

Metal ions present in waste samples, industrial effluents, acid mines and other aqueous media constitute a serious challenge in different human activities. Solvent extraction a technique for preconcentration, separation and identification of trace amount of metal ions coupled with multivariate chemometric technique was used for the determination of Fe(II) and Cr(III) from solutions in the presence of bis(salicylidene)ethylenediamine (SALEN). The influence of main extraction variables affecting the extraction efficiency was simultaneously studied and regression model equations illustrating the relationship between variables predicted. The extraction parameters (time of extraction, acid concentration, ligand concentration, temperature and metal concentration) were optimized using experimental designs with the contributions of the various parameters to extraction of the metal ions bound to the complexone evaluated using SPSS19.0 software. The statistically determined simulated models for the parameters were R2 = 0.946, 0.727, 0.793, 0.53, 0.53, 1.000 and F- values of 70.400, 13. 285, 15.348, 4.646 and 2.569×105 respectively for time of extraction, acid concentration, ligand concentration, temperature and metal concentration for Cr (III). For Fe (II), R2 = 0.243, 0.371, 0.519, 0.446, 1.000 and F-values of 0.964, 2.953, 4.310, 3.216 and 2.516×105 for time of extraction, acid concentration, ligand concentration, temperature and metal concentration respectively. The level of significance of the models as predicted was both lower than 5% making it feasible, efficient, reproducible and accurate. This means that metal ions at the conditions stated could be removed from waste samples, industrial effluents, acid mines and other aqueous media with extension in industrial scale application.

scholarly journals Recent advances of biomass carbon dots on syntheses, characterization, luminescence mechanism, and sensing applications

Nano Select ◽  
2021 ◽  
Author(s):  
Ying Lou ◽  
Xinyu Hao ◽  
Lei Liao ◽  
Kaiyou Zhang ◽  
Shuoping Chen ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Biomass Carbon ◽  
Sensing Applications ◽  
Recent Advances

A dual-emission ratiometric fluorescent nanoprobe based on silicon nanoparticles and carbon dots for efficient detection of Cu(II)

CrystEngComm ◽  
2021 ◽  
Author(s):  
Huiyuan Kou ◽  
Shujie Pang ◽  
Boyu Yang ◽  
Mao Wang ◽  
Juan Ding ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Silicon Nanoparticles ◽  
Dual Emission ◽  
Emission Properties ◽  
Fluorescent Nanoprobe ◽  
Fluorescent Silicon Nanoparticles ◽  
Efficient Detection ◽  
New Type

In this work, a new type of ratiometric fluorescent nanoprobe with dual-emission properties is designed and constructed. The dual-emission nanoprobe is prepared from fluorescent silicon nanoparticles (Si NPs) and carbon...

Ratiometric detection of heavy metal ions using fluorescent carbon dots

2019 ◽  
Vol 6 (4) ◽  
pp. 1121-1130 ◽  
Author(s):  
Francisco Yarur ◽  
Jun-Ray Macairan ◽  
Rafik Naccache
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Carbon Dots ◽  
Heavy Metal Ions ◽  
Ratiometric Detection ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

Classical methods for the detection of heavy metal ions in water are tedious and time consuming.

Surface adhered fluorescent carbon dots extracted from the harmful diesel soot for sensing Fe(iii) and Hg(ii) ions

2021 ◽  
Author(s):  
Gunture ◽  
Jaidev Kaushik ◽  
Deepika Saini ◽  
Ravindra Singh ◽  
Prashant Dubey ◽  
...  
Keyword(s):  
Metal Ions ◽  
Aqueous Medium ◽  
Carbon Material ◽  
Carbon Dots ◽  
Cost Effective ◽  
Diesel Soot ◽  
Isolation Method ◽  
Green Fluorescent ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

A simple cost effective isolation method has been described for the extraction of surface-adhered blue–green fluorescent carbon material from the diesel soot and used them for the selective sensing of Fe(iii) and toxic Hg(ii) metal ions in aqueous medium.

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