Carbon nano-material for rapidly detecting residual chlorine in water, and matching device and use method thereof

A carbon nanomaterial and water detection technology, applied in the fields of analytical chemistry and nanometers, can solve the problems of high price, fluorescence quenching, and inability to monitor online, and achieve the effects of low cost, simple operation and wide application range.

Active Publication Date: 2018-03-16
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of complex operation, high price, inability to carry, and inability to monitor on-line in the existing instruments, and provides a carbon nanomaterial for rapid detection of residual chlorine in water and its matching device and method of use. Synthesized carbon dots ( m -CDs) can specifically respond to hypochlorite (ClO - ), and the characteristics of fluorescence quenching occur to achieve the ClO in water - The visual detection method is highly sensitive, easy to operate, and portable, and is suitable for rapid on-line detection of residual chlorine in water.

Method used

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  • Carbon nano-material for rapidly detecting residual chlorine in water, and matching device and use method thereof
  • Carbon nano-material for rapidly detecting residual chlorine in water, and matching device and use method thereof
  • Carbon nano-material for rapidly detecting residual chlorine in water, and matching device and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: carbon dots m -Synthesis of CDs

[0025] Firstly, 0.6 g of m-phenylenediamine was dissolved in 60 mL of absolute ethanol, and then the solution was transferred to a 100 mL polytetrafluoroethylene high-temperature reactor, and the reaction was heated at 180 °C for 12 h, and the reactor was cooled to room temperature. Finally, the resulting product is separated and purified by column chromatography (eluent is dichloromethane:methanol=15:1, v / v), and the obtained solution is spin-dried with a rotary evaporator and vacuum-dried, that is get carbon dots m -Solid crystals of CDs ( m -Relevant characterization of CDs such as figure 1 , where A is m - Transmission electron microscope image of CDs, showing that the particle size distribution is 4-6 nm; B is m -Atomic force microscope image of CDs, characterizing its height; C is corresponding to B m -The height of CDs is displayed as about 1.5 nm; D is the ultraviolet absorption diagram, fluorescence excitation ...

Embodiment 2

[0026] Example 2: ClO - Drawing of standard curve

[0027] Use PBS (pH=7.0) buffer to prepare different concentrations of ClO - Solution (ClO - The concentration is 0, 0.05, 0.1, 0.25, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15 μM), and then at room temperature, to 20 μg / mL m -Add different concentrations of ClO to the CDs solution sequentially - Solution, after mixing and reacting for 5 min m -CDs fluorescence intensity changes and plotted with respect to ClO - Standard curve of response (eg figure 2 , where A is different concentrations of ClO - and m -The change graph of fluorescence intensity after CDs reaction; B is m -CDs respond to different concentrations of ClO - A standard curve with a response range of 0.05-7 μM and a limit of detection (LOD) of 0.012 μM).

Embodiment 3

[0028] Example 3: m - Preparation of CDs agarose hydrogel

[0029] Take a certain volume of 20 μg / mL m-CDs solution, add agarose powder to it, and make the agarose evenly distributed in the solution by magnetic stirring, then heat in a microwave oven until the agarose is completely dissolved and forms a viscous colloid, take 300 μL of the sol and drop it evenly in a centrifuge tube In the groove of the lid, after it cools to room temperature, it forms a round cake m - CDs agarose hydrogel. Take it out and put it in a centrifuge tube filled with distilled water and store it in the refrigerator at 4°C for later use.

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Abstract

The invention discloses a carbon nano-material for rapidly detecting residual chlorine in water, and a matching device and a use method thereof. The carbon nano-material is fluorescence-quenched carbon dots m-CDs for specifically responding to ClO<->, and prepared from m-phenylenediamine through hydrothermal synthesis and column chromatography separation and purification; and the m-CDs are immobilized with agarose powder to obtain the portable device for rapidly detecting residual chlorine in water, which is m-CDs agarose hydrogel. In the detection process, the m-CDs can be directly reacted with a water sample to be detected, and the content of the residual chlorine in the water sample is calculated by a standard curve technology; or the m-CDs agarose hydrogel is used to make a standard colorimetric card, and the fluorescence intensity of the m-CDs agarose hydrogel reacted with the water sample to be detected is compared with the standard colorimetric card to determine the content of the residual chlorine in the water sample. The method has the advantages of high sensitivity, simplicity in operation, portability, and suitableness for rapid detection of the residual chlorine in tapwater and swimming pool water.

Description

technical field [0001] The invention relates to a carbon nanometer material for rapidly detecting residual chlorine in water, a matching device and a use method thereof, and belongs to the fields of analytical chemistry and nanometer technology. Background technique [0002] Hypochlorite (ClO - ), as a strong oxidant, has been widely used as a disinfectant for the treatment of water bodies including drinking water, swimming pool water, and non-reusable wastewater. Cl dissolved in water 2 , HClO and ClO - The sum of is defined as free residual chlorine. In water treatment, the concentration of free residual chlorine should be strictly controlled, neither too low nor too high. The free residual chlorine content is too low to effectively kill pathogenic bacteria and viruses in the water. However, excess free residual chlorine will react with organic matter present in the water to produce large amounts of by-products, especially trihalomethanes (THMs), so too high a level o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
Inventor 郭隆华占园进邱彬林振宇陈国南
Owner FUZHOU UNIV
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