Preparation of thiol-ended polyvinyl alcohol quantum dot composite material and application of material in detection of trace Cu<2+> in water sample

A technology of mercapto polyvinyl alcohol and polyvinyl alcohol, which is used in luminescent materials, material excitation analysis, fluorescence/phosphorescence, etc.

Inactive Publication Date: 2015-09-02
NORTHWEST NORMAL UNIVERSITY
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  • Claims
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Problems solved by technology

However, only a few studies have devoted to the preparation of water-soluble quantum dots using thiolated PVA directly as a stabilizer.

Method used

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  • Preparation of thiol-ended polyvinyl alcohol quantum dot composite material and application of material in detection of trace Cu&lt;2+&gt; in water sample
  • Preparation of thiol-ended polyvinyl alcohol quantum dot composite material and application of material in detection of trace Cu&lt;2+&gt; in water sample
  • Preparation of thiol-ended polyvinyl alcohol quantum dot composite material and application of material in detection of trace Cu&lt;2+&gt; in water sample

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Embodiment Construction

[0070] The synthesis of the quantum dot composite material CdS-S-PVA of the present invention and the detection of Cu in the water sample are given below by specific examples. 2+ method is further explained.

[0071] 1. Synthesis of quantum dot composite material CdS-S-PVA

[0072] (1) Synthesis of thiol-functionalized polyvinyl alcohol (PVA-SH): Weigh 2.00 g of PVA1799 (polymerization degree 1700) into a beaker, add 50 ml of distilled water, and stir at (80±5)°C to make PVA Dissolve completely and set aside. Add 10 ml of 36% acetic acid, 18 ml of acetic anhydride, 0.2 ml of concentrated sulfuric acid and 20 ml of thioglycolic acid to a 250 ml round bottom flask in sequence, and stir well. Then add the prepared polyvinyl alcohol aqueous solution into the flask, and react at a constant temperature of 30 °C for 24 h. The product was precipitated with absolute ethanol, and the obtained solid was put into a Soxhlet extractor and washed with methanol for 24 h to obtain PVA-S...

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Abstract

The invention discloses preparation of a thiol-ended polyvinyl alcohol quantum dot composite material. The preparation of the thiol-ended polyvinyl alcohol quantum dot composite material comprises the following steps: with acetic anhydride as an acetylation reagent and concentrated sulfuric acid as an esterification catalyst, under an acidic condition, carrying out an esterification reaction on polyvinyl alcohol and mercaptoacetic acid so as to obtain thiol-functionalized polyvinyl alcohol; complexing thiol-functionalized polyvinyl alcohol serving as a stabilizer with cadmium ion and sulfur ion, so as to obtain the thiol-ended polyvinyl alcohol quantum dot composite material with excellent stability, dispersity and optical property. Experiments show that with the addition of Cu<2+> with different concentrations (1-1000nM) in an aqueous solution of the thiol-ended polyvinyl alcohol quantum dot composite material, fluorescence of the solution shows certain linear extinction; therefore, the thiol-ended polyvinyl alcohol quantum dot composite material has the characteristics of high detection speed and ultra sensitiveness when used for detecting trace Cu<2+> in a water sample.

Description

technical field [0001] The invention relates to the preparation of a quantum dot polyvinyl alcohol nanocomposite material, in particular to the preparation of a mercaptopolyvinyl alcohol quantum dot (CdS-S-PVA) nanocomposite material, which is mainly used for trace Cu in water samples 2+ The ion detection belongs to the field of composite materials and the field of heavy metal ion detection. Background technique [0002] In recent years, due to the special physical and chemical properties of copper, it has been widely used in many fields, such as photocatalysis, magnetic semiconductor and so on. However, these uses cause large amounts of copper residues, resulting in the contamination of metallic copper in water and soil. As we all know, copper is one of the heavy metals that cause environmental pollution, and divalent copper is the most common stable form that causes copper pollution. Copper ions can easily enter the skin, respiratory tract, gastrointestinal tissue, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/56G01N21/64
Inventor 关晓琳张东海来守军张扬范红婷贾天明
Owner NORTHWEST NORMAL UNIVERSITY
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