A method for detecting and removing fluoride ions

A detection method, fluorine ion technology, applied in chemical instruments and methods, measuring devices, nanotechnology for materials and surface science, etc., can solve the problem of low selectivity and sensitivity of metal ions, and unsatisfactory dispersion , probe biological toxicity and other issues, to achieve excellent superparamagnetic properties, good cell permeability, and low cytotoxicity

Active Publication Date: 2021-12-24
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported probes have many shortcomings such as potential biological toxicity, low specific surface area, unsatisfactory dispersibility, and difficulty in practical application with the naked eye, and most of them are single fluorophores, and the probe fluorescence is weak. The selectivity and sensitivity of metal ions are not high, and its application in the ecological environment is questionable, which affects the further application in real life

Method used

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  • A method for detecting and removing fluoride ions
  • A method for detecting and removing fluoride ions
  • A method for detecting and removing fluoride ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] Embodiment 1 hydrophilic Fe 3 o 4 Synthesis of cores, organosilane-functionalized carbon dots (SiCDs) in dilute solutions and autofluorescent markers (Fe 3 o 4 @mSiO 2 -SiCDs) preparation

[0119] 1. Hydrophobic Fe 3 o 4 The synthesis of the core includes the following steps:

[0120] (1) 0.325g anhydrous FeCl 3 and 0.4g of trisodium citrate were dissolved in 40mL of ethylene glycol, and magnetically stirred until an orange-yellow solution was formed;

[0121] (2) Under magnetic stirring, add 3 g of sodium acetate until a uniform yellow-brown solution is obtained, transfer the solution to a 50 mL Teflon-lined autoclave, and keep it at 200 ° C for 10 h; cool to room temperature Finally, the black product was separated by magnetic force, washed 5 times with ethanol, washed 1 time in deionized water, and dried in vacuum at 40 °C to obtain the hydrophobic Fe 3 o 4 core.

[0122] 2. The synthesis of organosilane functionalized carbon dots (SiCDs) dilute solution, ...

Embodiment 2

[0131] Embodiment 2DTPA acid anhydride and the magnetic nanoparticle (Fe 3 o 4 @mSiO 2 -SiCDs@DTPA-Ni 2+ , FSMN) preparation

[0132] 1, the preparation process of diethylenetriaminepentaacetic acid (DTPA) anhydride is as follows figure 1 As shown, it specifically includes the following steps:

[0133] (1) 33.7g of diethylenetriaminepentaacetic acid (DTPA) was added to a 250mL round bottom flask containing 40mL of pyridine, and then 33mL of acetic anhydride was added;

[0134] (2) Pass N 2 Dissolved oxygen was removed, and the solution was vigorously stirred (1000 rpm) at 70°C for 24 hours to obtain DTPA anhydride;

[0135] (3) Wash DTPA anhydride twice in excess acetic anhydride, then wash three times in excess ether, and dry in vacuum to obtain diethylenetriaminepentaacetic dianhydride.

[0136] 2. Fluorescent silica-coated magnetic nanoparticles (Fe 3 o 4 @mSiO 2 -SiCDs@DTPA-Ni 2+ , FSMN) preparation method, comprises the following steps:

[0137] (1) the Fe of ...

Embodiment 3

[0140] Synthesis of embodiment 3 pure carbon dots (NCDs) and fluorescent probe (Fe 3 o 4 @mSiO 2 -SiCDs@DTPA-Ni 2+ -NCDs, FSMN-NCDs) preparation

[0141] 1. The preparation process of pure carbon dots (NCDs) is as follows: figure 2 As shown, it specifically includes the following steps:

[0142] (1) Mix 20 mL of deionized water with 0.84 g of trisodium citrate, transfer it to a 50 mL polytetrafluoroethylene-lined hydrothermal reactor, and react at a constant temperature of 200 ° C for 5 h;

[0143] (2) After cooling, add ammonia solution and react at 200°C for another 10 hours, dialyze the obtained yellow-brown solution in a dialysis bag, soak it in 1000mL deionized water, and stir it with gentle magnetic force (200~600rpm) at the same time overnight;

[0144] (3) After adjusting the pH value to 6, the NCDs solution was obtained.

[0145] 2. Fluorescent probes (Fe 3 o 4 @mSiO 2 -SiCDs@DTPA-Ni 2+ -NCDs, the preparation method of FSMN-NCDs) is as follows:

[0146] U...

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Abstract

The invention discloses a detection method and a removal method of fluoride ions. In the present invention, the mesoporous silica layer immobilized with carbon quantum dots (SiCDs) is used as an autofluorescent marker, and at the same time, fluorophore pure carbon dots (NCDs) and F ion acceptor nickel ions (Ni 2+ ) chelates are quenched fluorescent probes, forming a dual-fluorophore composite superparamagnetic fluorescent probe, using fluoride ions to compete with pure carbon dots to bind Ni in the fluorescent probe 2+ , thereby changing the fluorescence intensity to realize fast, efficient, specific and visual detection of fluoride ions, the detection limit is 65 nM, and the linear range is 1-25 μM; the present invention also establishes a simple, fast, specific and efficient fluoride ion The ion removal method, the removal efficiency of fluoride ion in tap water is as high as 96%, and the fluorescent probe can be recycled repeatedly, and it is expected to be widely used in the fields of biological and medical monitoring and detection.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis and detection. More specifically, it relates to a method for detecting and removing fluoride ions. Background technique [0002] Fluoride ion (F - ) are widely distributed in environmental systems and biological processes. Adequate intake of fluoride ions is beneficial to the health of teeth and bones, but too much or too little intake of fluoride ions will have adverse effects on the human body and may cause systemic diseases, such as Fluorosis and osteoporosis etc. Therefore, it is extremely important for human beings to accurately detect and control the concentration of fluoride ions in water resources. Traditional fluoride ion detection methods include fluoride ion selective electrode, ion chromatography, etc., but there are disadvantages such as high cost, complicated operation, and not easy to carry. In contrast, fluorescent chemical sensors have the advantages of convenience, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64C09K11/65C09K11/02B82Y20/00B82Y30/00B82Y40/00
CPCG01N21/6428C09K11/025C09K11/65B82Y20/00B82Y30/00B82Y40/00G01N2021/6439
Inventor 许跃李晓磊庄琳李倩琍
Owner SUN YAT SEN UNIV
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