Application of polyvinyl alcohol composite hydrogel in Raman spectrum for detecting rhodamine

A technology of Raman spectroscopy detection and composite hydrogel, which is applied in the directions of Raman scattering and material excitation analysis, can solve the problems of high cost and cumbersome operation, and achieve the effect of low cost, simple preparation and rapid adsorption

Inactive Publication Date: 2017-12-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the methods for detecting rhodamine mainly include liquid chromatography detection and Raman-enhanced detection. Among them, there are many substrates for Raman detection, such as pure gold or pure silver nanomaterials as substrates to detect crystal violet, but the cost is relatively high. Relatively cumbersome to operate

Method used

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  • Application of polyvinyl alcohol composite hydrogel in Raman spectrum for detecting rhodamine
  • Application of polyvinyl alcohol composite hydrogel in Raman spectrum for detecting rhodamine
  • Application of polyvinyl alcohol composite hydrogel in Raman spectrum for detecting rhodamine

Examples

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Embodiment 1

[0025] Example 1, according to references (YOSHIHIRO MORI, HITOSHI TOKURA, MASANORIYOSHIKAWA, Properties of hydrogels synthesized by freezing and thawing aqueous polyvinyl alcohol solutions and their applications, JOURNAL OF MATERIALSSCIENCE 32 (1997) 491-496) to carry out polyfreezing-thawing method Preparation of Vinyl Alcohol Hydrogel

[0026] Take 1.1g of polyvinyl alcohol dissolved in 8ml of deionized water at 90°C, stir for 30min, then cool to room temperature, take 1ml of the above-mentioned solution with a syringe with a capacity of 1ml, put it in the refrigerator at -18°C for 12h, and protect it from light at room temperature Thaw, freeze-thaw cycle 4 times, finally push the thawed gel into the sample bottle, soak in deionized water, change the water every 8h, repeat 4 times. Finally, the gel is taken out and freeze-dried with a freeze dryer to obtain a dried pure polyvinyl alcohol gel.

Embodiment 2

[0027] Embodiment 2 The preparation method of the polyvinyl alcohol hydrogel loaded with nano-silver comprises the following steps:

[0028] Step 1. Prepare polyvinyl alcohol hydrogel containing nano-silver precursor by cycle freezing-thawing method: take 1.1g polyvinyl alcohol and dissolve it in 8ml deionized water at 90°C, stir for 30min, then cool to room temperature, and pour into the system Add 2ml of 20mM silver nitrate solution, stir for 15min, and then take out the solution and centrifuge (500rpm, 3min) to drive out the air bubbles in the system. Use a syringe with a capacity of 1ml to take 1ml of the above-mentioned solution, put it in the refrigerator at -18°C for 12 hours, and thaw it at room temperature in the dark, freeze-thaw cycle 4 times, and finally push the thawed gel into the sample bottle for use ;

[0029] Step 2. Restore the silver nitrate in the gel by "dipping" method: cut the 3mm thick gel in step 1, soak it in 10ml of sodium borohydride solution with...

Embodiment 3

[0031] Example 3 The preparation method of polyvinyl alcohol hydrogel loaded with nano-silver, compared with Example 2, the difference is that in step one, 2ml of silver nitrate solution with a concentration of 50mM is added to the system instead, corresponding to step two The sodium borohydride concentration was 150 mM.

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Abstract

The invention discloses application of polyvinyl alcohol composite hydrogel in a Raman spectrum for detecting rhodamine. Sodium borohydride is adopted as a reducing agent, polyvinyl alcohol hydrogel which is controllable in morphology and particle size and carriers nano silver is prepared by using a circulation freezing-defreezing method and a dipping method, the operation is simple, no complex process or equipment is needed, and as a dispersion stabilizer, polyvinyl alcohol has a support protection function on electromagnetically enhanced nano silver granules. The polyvinyl alcohol composite hydrogel disclosed by the invention is convenient to use and simple to operate when used for detecting rhodamine by using a Raman spectrum.

Description

technical field [0001] The invention belongs to the preparation of a metal nano-polymer hydrogel composite material and its application in the field of surface Raman enhancement, and relates to the preparation of a polyvinyl alcohol hydrogel loaded with nano silver and its application as a Raman substrate. Background technique [0002] Rhodamine is a laser dye and fluorescent dye, red to brown powder, soluble in water and alcohol. It is widely used in bacteriology, cytology and histology, and is an excellent biological stain. However, because of its low price, convenient use, and antibacterial activity, it is often illegally abused in aquaculture. Rhodamine and its metabolites have high toxicity and high residues. After long-term exposure or ingestion, it is easy to cause cancer, distortion, mutation, etc. in living organisms, which are very harmful to living organisms and the environment. Therefore, the residual detection of this basic dye is one of the important issues i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65C08J3/075C08L29/04C08K3/08
Inventor 薛涛李方于治芳
Owner TIANJIN UNIV
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