scholarly journals N,N-Dimethyl Formamide Regulating Fluorescence of MXene Quantum Dots for the Sensitive Determination of Fe3+

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Xiaohui Gao ◽  
Xiaochun Shao ◽  
Longlong Qin ◽  
Yejun Li ◽  
Shengxiang Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Spectra ◽  
Dimethyl Formamide ◽  
Quenching Mechanism ◽  
X Ray ◽  
Highly Sensitive ◽  
Sensitive Sensor ◽  
Sensitive Determination ◽  
Induced Aggregation

AbstractDue to the wide use of iron in all kinds of areas, the design and construction of direct, fast, and highly sensitive sensor for Fe3+ are highly desirable and important. In the present work, a kind of fluorescent MXene quantum dots (MQDs) was synthesized via an intermittent ultrasound process using N,N-dimethyl formamide as solvent. The prepared MQDs were characterized via a combination of UV–Vis absorption, fluorescence spectra, X-ray photoelectron energy spectra, and Fourier-transform infrared spectroscopy. Based on the electrostatic-induced aggregation quenching mechanism, the fluorescent MQDs probes exhibited excellent sensing performance for the detection of Fe3+, with a sensitivity of 0.6377 mM−1 and the detection limit of 1.4 μM, superior to those reported in studies. The present MQDs-based probes demonstrate the potential promising applications as the sensing device of Fe3+.

scholarly journals N, N-Dimethyl Formamide Regulating Fluorescence of MXene Quantum Dots for the Sensitive Determination of Fe3+

2021 ◽  
Author(s):  
Xiaohui Gao ◽  
Xiaochun Shao ◽  
Longlong Qin ◽  
Yejun Li ◽  
Shengxiang Huang ◽  
...  
Keyword(s):  
Fluorescence Spectra ◽  
Energy Spectra ◽  
Dimethyl Formamide ◽  
Quenching Mechanism ◽  
X Ray ◽  
Highly Sensitive ◽  
Sensitive Sensor ◽  
Sensitive Determination ◽  
Induced Aggregation

Abstract Due to widely use of iron in all kinds of areas, the design and construction of direct, fast, and highly sensitive sensor for Fe3+ is highly desirable and important. In the present work, a kind of fluorescent MQDs were synthesized via an intermittent ultrasound process with N,N-dimethyl formamide as solvent. The prepared MQDs were characterized via a combination of UV-Vis absorption, fluorescence spectra, X-ray photoelectron energy spectra, and Fourier transform infrared spectroscopy. Based on the electrostatic induced aggregation quenching mechanism, the fluorescent MQDs probes exhibited excellent sensing performance for the detection of Fe3+, with a sensitivity of 0.6377 mM− 1 and the detection limit of 1.4 µM, superior to those reported in literatures. The present MQDs-based probes demonstrate potential promising applications as the sensing device of Fe3+.

scholarly journals Highly sensitive determination of heavy metals in water prior to and after remediation using Citrofortunella Microcarpa

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shirley T. Palisoc ◽  
Remuel Isaac M. Vitto ◽  
Marissa G. Noel ◽  
Katja T. Palisoc ◽  
Michelle T. Natividad
Keyword(s):  
Water Samples ◽  
Limit Of Detection ◽  
Current Response ◽  
Experimental Conditions ◽  
X Ray ◽  
Highly Sensitive ◽  
Novel Method ◽  
Sensitive Determination ◽  
Strong Linear Relationship

AbstractA highly sensitive bismuth/silver nanoparticles/Nafion-modified screen-printed graphene electrode was fabricated and was utilized for the detection of trace lead (Pb) concentrations in river water samples prior to and after remediation using calamansi (Citrofortunella Microcarpa) rinds in different forms viz., ground sun-dried, dry-ashed, food-grade pectin, fractionated pectin, and alcohol insoluble solids—extracted pectin. All these forms of pectin remediated Pb in the water samples. Hence, this novel method of using calamansi rinds in different forms is an effective method for the removal of lead in water. The electrode was characterized using scanning electron microscopy and energy dispersive x-ray spectrometry which confirmed the presence of the modifiers on the electrode surface. The limit of detection of 267.6 ppt and the strong linear relationship between the Pb concentration and the anodic current response (R2 = 0.999) were obtained under optimized experimental conditions and parameters.

Cross Double Point Discharge as Enhanced Excitation Source for Highly Sensitive Determination of Arsenic, Mercury and Lead by Optical Emission Spectrometry

2021 ◽  
Author(s):  
Lin He ◽  
Peixia Li ◽  
Kai Li ◽  
Tao Lin ◽  
Jin Luo ◽  
...  
Keyword(s):  
Double Point ◽  
Hydride Generation ◽  
Optical Emission ◽  
Sample Introduction ◽  
Excitation Source ◽  
Emission Spectrometry ◽  
Highly Sensitive ◽  
Point Discharge ◽  
Sensitive Determination

A new cross double point discharge (CrossPD) microplasma was designed as an excitation source to construct a miniaturized optical emission spectrometer with hydride generation (HG) for sample introduction. The CrossPD...

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