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Core-shell type magnetic fluorescent sensing microsphere for hexavalent chromium anion imprints

A fluorescent sensing and anion technology, applied in alkali metal oxides/hydroxides, inorganic chemistry, water/sludge/sewage treatment, etc., can solve problems such as cumbersome methods and increased environmental burdens

Inactive Publication Date: 2018-01-12
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For wastewater with a high content of hexavalent chromium, ferrous sulfate and sulfur trioxide can also be used to reduce hexavalent chromium to trivalent chromium, but the above two methods require additional chemical reagents and additional environmental burdensome and cumbersome

Method used

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  • Core-shell type magnetic fluorescent sensing microsphere for hexavalent chromium anion imprints
  • Core-shell type magnetic fluorescent sensing microsphere for hexavalent chromium anion imprints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Under the action of ultrasound, completely dissolve 2.7g of ferric chloride hexahydrate in 80mL of ethylene glycol, then add 0.5g of sodium citrate and 3.6g of anhydrous sodium acetate for mixing, and stir rapidly for 1-2 hours. Put the mixed solution into a polytetrafluoroethylene stainless steel hydrothermal reaction kettle, move the hydrothermal reaction kettle to an oven at 200 ° C for 12 hours, take out the reaction kettle after the reaction is completed and cool it to room temperature, and use a magnet to absorb the obtained Fe 3 o 4 The nanoparticles are separated, washed with absolute ethanol for 3 to 4 times, and then put into a vacuum drying oven at 40° C. to dry to constant weight.

[0030] (2) Add 140mL absolute ethanol and 3mL ammonia water with a mass fraction of 28% to a 250mL three-necked bottle, and then add 0.30g Fe 3 o 4 Nanoparticles were ultrasonically dispersed for 1 h, and then a mixture of ethanol and tetraethyl orthosilicate (TEOS) (10 mL ...

Embodiment 2

[0034] Get the K of 0.5mL 0.268mmol / L of embodiment 1 2 Cr 2 o 7 , 0.1g double bond modified Fe 3 o 4 Particles, add 40mL of acetonitrile as a solvent, after ultrasonic dispersion, add 1mmol of NIPAM as an adsorption monomer, 0.5mmol of NVC as a fluorescent monomer, 2mmol of ethylene glycol dimethacrylate (EGDMA) as a cross-linking agent and 0.02 g AIBN was used as an initiator, and the fluorescence enhancement rate of the obtained microspheres was 42.5% after distillation precipitation polymerization and removal of hexavalent chromium. Using the resulting microspheres for different concentrations of K 2 Cr 2 o 7 aqueous solution for adsorption, the results show that when K 2 Cr 2 o 7 When the concentration is 0.268mmol / L, it reaches its maximum adsorption capacity of 73.51mg / g, the highest adsorption efficiency is 68.28%, and then increases K 2 Cr 2 o 7 concentration, the maximum adsorption capacity remained unchanged, and the maximum adsorption efficiency gradual...

Embodiment 3

[0036] Get the K of 0.5mL 0.313mmol / L of embodiment 1 2 Cr 2 o 7 , 0.1 g double bond modified Fe 3 o 4 Particles, add 40mL of acetonitrile as solvent, after ultrasonic dispersion, add 1mmol of NIPAM as adsorption monomer, 0.5mmol of NVC as fluorescent monomer, 1.6mmol of DVB as cross-linking agent and 0.015g of AIBN as initiator, and precipitate by distillation After polymerization and removal of hexavalent chromium, the fluorescence enhancement rate of the obtained microspheres was 48.65%. Using the resulting microspheres for different concentrations of K 2 Cr 2 o 7 aqueous solution for adsorption, the results show that when K 2 Cr 2 o 7 When the concentration was 0.313mmol / L, it reached its maximum adsorption capacity of 61.24mg / g, and the highest adsorption efficiency was 52.38%, and then increased K 2 Cr 2 o 7 concentration, the maximum adsorption capacity remained unchanged, and the maximum adsorption efficiency gradually decreased.

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Abstract

The invention relates to a core-shell type magnetic fluorescent sensing microsphere for hexavalent chromium anion imprints. A Fe3O4 magnetic material is taken as a core of the core-shell type magneticfluorescent sensing microsphere; a layer of fluorescent material with hexavalent chromium anion imprints is wrapped on the surface of the core and is used as a shell; the microsphere has a selectiveadsorbing function for hexavalent chromium anions; after the microsphere adsorbs the hexavalent chromium anions, the fluorescence intensity is reduced; the hexavalent chromium anion concentration in the system can be known in the manner of measuring the change of the fluorescence intensity; the core-shell type magnetic fluorescent sensing microsphere provided by the invention can be applied to thefield of recycling or detection of the hexavalent chromium anions.

Description

technical field [0001] The invention relates to a core-shell magnetic fluorescent sensing microsphere imprinted with hexavalent chromium anions, which not only has the ability to selectively adsorb hexavalent chromium anions from water, such as Cr 2 o 7 2- , and can detect the concentration of hexavalent chromium anions in the system at this time. Background technique [0002] With the development of modern industry, the environmental pollution and biological hazards of heavy metals have become more serious. This is mainly because heavy metal pollution is different from general organic pollution. Or biological methods decompose and consume, resulting in the accumulation of such pollutants in the environment and organisms, and passing them through the food chain, so they cause great harm to human health. For the common harmful Hg 2 + , pb 3+ Cationic heavy metal pollutants, such as cationic heavy metal pollutants, can be better removed by conventional ion exchange resin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F212/36C08F220/54C08F226/12C08F222/10C08J9/26B01J20/26B01J20/28B01J20/30C02F1/28C02F101/22
Inventor 代昭余荃武文静
Owner TIANJIN POLYTECHNIC UNIV
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