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A kind of cellulose fluorescent film and preparation method thereof

A cellulose membrane and cellulose technology, applied in the field of fluorescence detection, can solve problems such as practical application limitations, and achieve the effects of simple preparation method, increased removal effect, and low equipment requirements

Active Publication Date: 2020-11-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the research on functional materials integrating detection and removal is limited to nanoparticles, but this material has great limitations for practical applications in industry, such as the development of thin films that integrate detection and removal functions Fluorescent sensor materials will be very helpful for industrial applications

Method used

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  • A kind of cellulose fluorescent film and preparation method thereof
  • A kind of cellulose fluorescent film and preparation method thereof
  • A kind of cellulose fluorescent film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 10 g of natural cotton linter cellulose, 0.16 g of TEMPO reagent and 1 g of NaBr, and place in 600 mL of Na with a pH of 10.5 2 CO 3 / NaHCO 3 In the buffer solution, 8 mL of NaClO solution adjusted to pH 10 with HCl was added every 0.5 h, and the reaction time was started for 5 h when the NaClO solution was added for the first time. The reaction was carried out at room temperature with a stirring speed of 500 r / min. During the reaction, 0.5 mol / L NaOH was continuously added dropwise to keep the pH at 10-11. After the reaction was completed, excess ethanol was added to obtain a white precipitate, which was washed 3 times with absolute ethanol by a centrifuge, finally washed with acetone, and centrifuged. The solid product was added to 1% NaClO 2 In the solution, adjust the pH to about 4.8, continue to oxidize at room temperature for 48 hours, wash with deionized water, centrifuge, and freeze-dry, that is, the cellulose oxidized by TEMPO.

[0026] Weigh 2g of n...

Embodiment 2

[0029] The TEMPO oxidized cellulose step is according to Example 1. Weigh 2.67g of natural cotton linter cellulose and 1.33g of TEMPO oxidized cellulose and mix them into a beaker. Other operating steps are according to Example 1.

Embodiment 3

[0031]The step of TEMPO oxidizing cellulose and the step of preparing cellulose film are according to Example 1, prepare 0.5, 1, 1.5 mg / mg graphene oxide aqueous solution, soak the cellulose film for 24 hours respectively, and compare the effects of three kinds of graphene oxide concentrations on cellulose The influence of the film, under the premise of ensuring that the fluorescent effect is not affected and the loading efficiency of the fluorescent molecules is improved, a 1 mg / mL graphene oxide solution was selected to obtain a cellulose film loaded with graphene oxide, and other operating steps were as in Example 1. .

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Abstract

The invention provides a cellulose fluorescent film. The cellulose fluorescent film is prepared from cellulose and cellulose oxidized by TEMPO (2,2,6,6-tetramethyl-piperidin-1-yl)oxyl through dissolution, film formation and sequential dipping in graphene oxide and fluorescent dye. The invention also provides a preparation method of the cellulose fluorescent film. The removal effect of cellulose on copper ions is increased with the adoption of TEMPO oxidized cellulose, and film formation by cellulose is not affected. The loading quantity of fluorescent molecules is increased by use of graphene oxide. No chemical reactions occur in the processes of dissolution of cellulose and TEMPO oxidized cellulose, film formation and loading of graphene oxide and fluorescent dye, no pollution is caused to the environment, requirements for equipment are low, industrial production is facilitated, and the obtained cellulose fluorescent film is safe and non-toxic and belongs to the environment-friendly material. Experimental results prove that the provided cellulose fluorescent film has higher filtration and removal efficiency for copper ions and can integrate removal and detection of copper ions.

Description

technical field [0001] The invention belongs to the technical field of fluorescence detection, and in particular relates to a cellulose fluorescent film and a preparation method thereof. Background technique [0002] Some excessive heavy metal ions contained in industrial wastewater that are difficult to be degraded by microorganisms will seriously affect the ecological environment, and can enter plants, animals and even humans through the food chain, causing various diseases and seriously endangering human health. Copper is contained in wastewater from smelting, metal processing, machine manufacturing, organic synthesis and other industries. Among them, wastewater from metal processing and electroplating factories contains the highest amount of copper, which contains tens to hundreds of milligrams of copper per liter of wastewater. Discharge of waste water into water bodies will affect the quality of water. [0003] In recent years, fluorescence detection and analysis meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/06C08J5/18C08B15/02G01N21/64C02F1/44C02F101/20C08L1/02C08L1/04
CPCC02F1/44C02F2101/20C08B15/02C08J5/18C08J7/065C08J2301/02C08J2301/04G01N21/643
Inventor 李檬肖惠宁刘志江毛博阳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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