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Preparation and application of fluorescent carbon dot nanoprobe for detecting free chlorine in water

A nanoprobe and fluorescent carbon dot technology, applied in the field of environmental analysis, can solve the problems of poor selectivity, complex operation, low sensitivity, etc., and achieve the effects of short carbonization time, simple preparation and short response time.

Inactive Publication Date: 2015-04-22
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, each of these methods has its own limitations, such as, many methods use toxic reagents, some methods have poor selectivity, low sensitivity and complicated operation

Method used

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  • Preparation and application of fluorescent carbon dot nanoprobe for detecting free chlorine in water
  • Preparation and application of fluorescent carbon dot nanoprobe for detecting free chlorine in water
  • Preparation and application of fluorescent carbon dot nanoprobe for detecting free chlorine in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of N, S-CDs fluorescent probe

[0034] N, S-CDs fluorescent nanoprobes were synthesized by hydrothermal method, and the specific steps were as follows: 2.0 g citric acid (9.5 mmol) and 1 g L-cysteine ​​(8.3 mmol) were dissolved in 5 mL water, and then Evaporated to dryness at 70°C, then transferred to a polytetrafluoroethylene-lined autoclave, heated to 200°C at a rate of 10°C per minute, and kept for 3 h, the obtained reddish-brown solution was treated with 1 mol / L NaOH The pH of the solution was adjusted to 7.0, and then centrifuged at a speed of 12000 rpm to obtain an aqueous N, S-CDs solution, which was dialyzed (MWCO: 1 KDa, pore size: 1.0 nm) to separate unreacted substances and stored at 4 °C in the dark.

Embodiment 2

[0036] Application of N,S-CDs Fluorescent Probes to Detect Free Chlorine in Water

[0037] In the phosphate buffer solution with pH=5, when the concentration of N, S-CDs is 1 μg / mL, the response speed of free chlorine to N, S-CDs is fast. Under the excitation of 345 nm wavelength, N, S-CDs The fluorescence was quickly quenched by about 60%, and in 10 min, the fluorescence was quenched by about 80%, and in the next 1 hour, the fluorescence intensity remained basically unchanged.

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Abstract

The invention relates to preparation and application of a fluorescent carbon dot nanoprobe for detecting free chlorine in water. The free chlorine in the water is detected by quenching a fluorescent signal by taking nitrogen and sulfur co-doped carbon dots (N,S-CDs) which are synthesized by citric acid (CA) and L-gystein as raw materials as the fluorescent probe. Experimental conditions such as concentration of S-CDs, response time, pH value of a solution and the like are optimized. Under the optimized condition, the fluorescent strength quenching extent of the system and the concentration of the free chlorine represent a good linear relationship: [R<2>=0.9945] in a range of 0.01-100micro mol / L and the detection limit is 5nmol / L. As an effective method for detecting the free chlorine in the water, the method shows a remarkable advantage, has the characteristics of simplicity, low cost, greenness, high selectivity, rapidness, sensitivity and the like and is successfully applied to detecting the free chlorine in local tap water and swimming pool water in Guilin. The sensing method has a broad application prospect in water quality analysis in the field of environment analysis.

Description

technical field [0001] The invention belongs to the technical field of environmental analysis, in particular to the preparation and application of a fluorescent carbon dot nanometer probe for detecting free chlorine in water. Background technique [0002] Chlorine is a common oxidizing agent that has been widely used in water disinfection, bleaching, and numerous other industrial manufacturing processes. During water treatment, free residual chlorine (including dissolved Cl 2 , HClO and ClO - The concentration of total) must be strictly controlled, neither too low nor too high, the concentration of free residual chlorine is too low, it cannot kill viruses and pathogenic bacteria in water, and the purpose of effectively cleaning and purifying water cannot be achieved; if free residual chlorine Too high a chlorine concentration is also harmful because too much free chlorine reacts with organic matter present in the water to produce a large number of harmful by-products, espe...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 赵书林薛茗月湛志华张亮亮
Owner GUANGXI NORMAL UNIV
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