scholarly journals Novel PSMA-Coated On-Off-On Fluorescent Chemosensor Based on Organic Dots with AIEgens for Detection of Copper (II), Iron (III) and Cysteine

Polymers ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 786 ◽  
Author(s):  
Rui Jiang ◽  
Na Liu ◽  
Fan Li ◽  
Wensheng Fu ◽  
Yun Zhou ◽  
...  
Keyword(s):  
Metal Ions ◽  
High Selectivity ◽  
Detection Limits ◽  
Linear Range ◽  
Fluorescent Chemosensor ◽  
Fluorescent Detection ◽  
Precipitation Method ◽  
Wide Linear Range

Herein, a novel on-off-on fluorescent chemosensor for copper (II) ion (Cu2+), iron (III) ion (Fe3+) and cysteine is developed simply by the nano-precipitation method. The prepared organic dots with AIEgens (AIE dots) are advantageous over other metal ions in detecting Cu2+, Fe3+ with high selectivity and sensitivity by forming agglomerations (on-off). The agglomerations formed by AIE dots and Cu2+ redistributed and the fluorescence was obviously recovered in the presence of cysteine (off-on). This sensor has a wide linear range for Cu2+, Fe3+ and cysteine. The fluorescent detection limits of AIE dots are calculated to be 107 nM for Cu2+, 120 nM for Fe3+ and 78 nM for cysteine, respectively. These results indicate that the AIE dots can be used as a potential probe for Cu2+, Fe3+ and cysteine detection.

scholarly journals A Novel Ruthenium(II) Polypyridyl Complex Bearing 1,8-Naphthyridine as a High Selectivity and Sensitivity Fluorescent Chemosensor for Cu2+ and Fe3+ Ions

Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4032 ◽  
Author(s):  
Chixian He ◽  
Shiwen Yu ◽  
Shuye Ma ◽  
Zining Liu ◽  
Lifeng Yao ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Metal Ions ◽  
High Selectivity ◽  
Detection Limits ◽  
Fluorescent Chemosensor ◽  
Polypyridyl Complex ◽  
Elemental Analyses

A novel ruthenium(II) polypyridyl complex bearing 1,8-naphthyridine was successfully designed and synthesized. This complex was fully characterized by EI-HRMS, NMR, and elemental analyses. The recognition properties of the complex for various metal ions were investigated. The results suggested that the complex displayed high selectivity and sensitivity for Cu2+ and Fe3+ ions with good anti-interference in the CH3CN/H2O (1:1, v/v) solution. The fluorescent chemosensor showed obvious fluorescence quenching when the Cu2+ and Fe3+ ions were added. The detection limits of Cu2+ and Fe3+ were 39.9 nmol/L and 6.68 nmol/L, respectively. This study suggested that this Ru(II) polypyridyl complex can be used as a high selectivity and sensitivity fluorescent chemosensor for Cu2+ and Fe3+ ions.

Fluorescence chemosensor containing 4-methyl-7-coumarinyloxy, acetylhydrazono and N-phenylaza-15-crown-5 moieties for K+ and Ba2+ ions

2018 ◽  
Vol 24 (3) ◽  
pp. 141-145 ◽  
Author(s):  
Qiang Zhang ◽  
Kaifei Duan
Keyword(s):  
Metal Ions ◽  
Binding Constants ◽  
Detection Limits ◽  
Fluorescent Chemosensor ◽  
Fluorescent Sensing ◽  
Fluorescence Titration

AbstractA new aza-15-crown-5 derivative 1 bearing coumarin and hydrazone moieties was synthesized and characterized. The fluorescent sensing behavior and selectivity of 1 toward different metal ions in ethanol were investigated. There are 4-fold and 2-fold fluorescence enhancements of 1 at λem=406 nm upon addition of five equivalents of K+ and Ba2+, respectively. The fluorescence titration revealed the stoichiometry of 1:1 for 1-K+1-Ba2+ complexes and the binding constants (lgKs) of 4.11 for 1-K+ and 3.61 for 1-Ba2+. Compound 1 can be used as a fluorescent chemosensor for K+ and Ba2+ through discriminable photoresponse signals. The calculated detection limits for K+ and Ba2+ are 2.28 μm and 5.21 μm, respectively.

Sugar thiacrown-ether appended calix[4]arene as a selective chemosensor for Fe2+and Fe3+ions

RSC Advances ◽  
2015 ◽  
Vol 5 (107) ◽  
pp. 88038-88044 ◽  
Author(s):  
Irene Ling ◽  
Rauzah Hashim ◽  
Karem J. Sabah
Keyword(s):  
Metal Ions ◽  
High Selectivity ◽  
Fluorescent Chemosensor ◽  
Thiacrown Ether

A fluorescent chemosensor derived from sugar-thiacrown-ether appended calix[4]arene coupled with pyrene units was synthesized. Upon addition of Fe2+or Fe3+the fluorescence intensities are quenched indicating high selectivity for these metal ions.

The design of a simple fluorescent chemosensor for Al3+/Zn2+via two different approaches

2015 ◽  
Vol 7 (2) ◽  
pp. 716-722 ◽  
Author(s):  
Jing-can Qin ◽  
Long Fan ◽  
Bao-dui Wang ◽  
Zheng-yin Yang ◽  
Tian-rong Li
Keyword(s):  
Metal Ions ◽  
High Selectivity ◽  
Fluorescent Sensor ◽  
Fluorescent Chemosensor ◽  
Wide Range

In this study, we have developed a simple fluorescent sensor, 7-(2′,4′-dihydroxybenzylideneimino)-4-methyl coumarin, which shows a high selectivity towards Al3+/Zn2+over a wide range of metal ions.

scholarly journals Tuning the sensitivity towards mercury via cooperative binding to d-fructose: dual fluorescent chemosensor based on 1,8-naphthyridine-boronic acid derivative

RSC Advances ◽  
2021 ◽  
Vol 11 (24) ◽  
pp. 14862-14870
Author(s):  
Marina Rajadurai ◽  
E. Ramanjaneya Reddy
Keyword(s):  
Metal Ions ◽  
Acid Derivative ◽  
Boronic Acid ◽  
Toxic Metal ◽  
Fluorescent Chemosensor ◽  
Cooperative Binding ◽  
Toxic Metal Ions

This new dual d-fructose–mercury chemosensor is the first example of utilizing boronic acid–diol complexation for enhancement of the sensor's sensitivity towards toxic metal ions.

Reusability of metals/metal oxide coupled zinc oxide nanorods in degradation of rhodamine B dye

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Anh Thi Le ◽  
Swee-Yong Pung
Keyword(s):  
Metal Oxide ◽  
Metal Ions ◽  
Rhodamine B ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Uv Exposure ◽  
Precipitation Method ◽  
Subsequent Stage ◽  
Content Type ◽  
Metal Metal

Purpose This paper aims to investigate the reusability of metal/metal oxide-coupled ZnO nanorods (ZnO NRs) to degrade rhodamine B (RhB). Design/methodology/approach ZnO NRs particles were synthesized by precipitation method and used to remove various types of metal ions such as Cu2+, Ag+, Mn2+, Ni2+, Pb2+, Cd2+ and Cr2+ ions under UV illumination. The metal/metal oxide-coupled ZnO NRs were characterized by scanning electron microscope, X-ray diffraction and UV-Vis diffuse reflectance. The photodegradation of RhB dye by these metal/metal oxide-coupled ZnO NRs under UV exposure was assessed. Findings The metal/metal oxide-coupled ZnO NRs were successfully reused to remove RhB dye in which more than >90% of RhB dye was degraded under UV exposure. Furthermore, the coupling of Ag, CuO, MnO2, Cd and Ni particles onto the surface of ZnO NRs even enhanced the degradation of dye. The dominant reactive species involved in the degradation of RhB dye were •OH- and •O2−-free radicals. Research limitations/implications The coupling of metal/metal oxide onto the surface of ZnO NRs after metal ions removal could affect the photocatalytic performance of ZnO NRs in the degradation of organic pollutants in subsequent stage. Practical implications A good reusability performance of metal/metal oxide-coupled ZnO NRs make ZnO NRs become a desirable photocatalyst material for the treatment of wastewater, which consists of both heavy metal ions and organic dyes. Originality/value Metal/metal oxide coupling onto the surface of ZnO NRs particles improved subsequent UV-assisted photocatalytic degradation of RhB dye.

Removal of Heavy Metals from Aqueous Solution by Hydroxyapatite/Chitosan Composite

2013 ◽  
Vol 789 ◽  
pp. 176-179 ◽  
Author(s):  
Eny Kusrini ◽  
Nofrijon Sofyan ◽  
Dwi Marta Nurjaya ◽  
Santoso Santoso ◽  
Dewi Tristantini
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Metal Ions ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Removal Of Heavy Metals ◽  
Sem Micrograph ◽  
Pseudo Second Order ◽  
Chitosan Composite

Hydroxyapatite/chitosan (HApC) composite has been prepared by precipitation method and used for removal of heavy metals (Cr6+, Zn2+and Cd2+) from aqueous solution. The HAp and 3H7C composite with HAp:chitosan ratio of 3:7 (wt%) were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy-energy dispersive X-ray spectroscopy. The SEM results showed that HAp is spherical-shaped and crystalline, while chitosan has a flat structure. SEM micrograph of 3H7C composite reveals crystalline of HAp uniformly spread over the surface of chitosan. The crystal structure of HAp is maintained in 3H7C composite. Chitosan affects the adsorption capacity of HAp for heavy metal ions; it binds the metal ions as well as HAp. The kinetic data was best described by the pseudo-second order. Surface adsorption and intraparticle diffusion take place in the mechanism of adsorption process. The binding of HAp powder with chitosan made the capability of composite to removal of Cr6+, Zn2+and Cd2+from aqueous solution effective. The order of removal efficiency (Cr6+> Cd2+> Zn2+) was observed.

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