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Preparation method of porous nanocomposite material and application thereof in removal of heavy metal ions

A technology of nanocomposite materials and heavy metal ions, which is applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., to achieve the effects of strong adsorption capacity, improved adsorption capacity, and low cost

Active Publication Date: 2018-07-10
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the modification of graphene oxide by chitosan has been reported, so far, no porous nanocomposites based on the covalent modification of graphene oxide by chitosan functional derivatives have been reported for the removal of Hg in water. 2+ , Pb 2+ 、Cu 2+ and Cd 2+ reports of heavy metal ions

Method used

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  • Preparation method of porous nanocomposite material and application thereof in removal of heavy metal ions
  • Preparation method of porous nanocomposite material and application thereof in removal of heavy metal ions
  • Preparation method of porous nanocomposite material and application thereof in removal of heavy metal ions

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Preparation of 2,5-bis(methylmercapto)terephthalaldehyde-chitosan-graphene oxide (BMTTPA-CS-GO) porous nanocomposite

[0021]300 milligrams of chitosan (CS) are dissolved in the acetic acid solution that mass fraction is 2%, add 30 milliliters of methanol, after stirring at room temperature, slowly add 105 milligrams of 2,5-di(methylmercapto) terephthalaldehyde ( BMTTPA), continued to stir at room temperature for 24 hours, the resulting mixture was washed several times with methanol, filtered, and dried in a vacuum oven at 40°C for 8 hours to make BMTTPA-CS; 0.3 g of BMTTPA-CS and 0.7 g of graphene oxide (GO) was dispersed in 80 milliliters of ultrapure water, then added 0.35 grams of carbodiimide and 0.11 grams of N-hydroxysuccinimide, and stirred at room temperature for 24 hours; after the resulting product was filtered, washed with 0.1M acetic acid solution, and The obtained solid was dispersed in 80 ml of ultrapure water; the dispersion was poured into a 24-well cel...

Embodiment 2

[0024] BMTTPA-CS-GO Porous Nanocomposite for Removal of Heavy Metal Ions in Water

[0025] (1) Optimization of pH and BMTTPA-CS-GO dosage

[0026] The pH value of the aqueous solution and the dosage of BMTTPA-CS-GO porous nanocomposite were optimized. The results show that when the pH value of the aqueous solution is 7, the BMTTPA-CS-GO nanocomposite is sensitive to Hg 2+ , Pb 2+ 、Cu 2+ and Cd 2+ maximum adsorption efficiency. When the pH value of the solution is lower than 5, the efficiency of BMTTPA-CS-GO porous nanocomposites to remove target heavy metal ions is low, which is due to the proton (H + ) and target heavy metal ions on the active sites and functional groups (amine / imine and methylthiol) in BMTTPA-CS-GO porous nanocomposites. When the pH value of the solution was greater than 7, the removal rate of heavy metal ions by BMTTPA-CS-GO porous nanocomposites decreased, which might be caused by the hydrolysis of heavy metal ions. Therefore, the pH value 7 of the ...

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Abstract

The invention discloses a preparation method of a porous nanocomposite material and application thereof in removal of heavy metal ions, belonging to the technical field of environmental protection. The porous nanocomposite material is prepared by the following steps: making 2,5-di(methylthio)p-phthalaldehyde react with chitosan by schiff base to obtain 2,5-di(methylthio)p-phthalaldehyde chitosan;and covalently grafting to the surface of graphene oxide. The hole wall of the porous nanocomposite material prepared by the method disclosed by the invention is provided with a plurality of amino, imine and methylthio functional groups which can form a stable compound with heavy metal ions, and thus, adsorption capacity on the heavy metal ions can be greatly improved. The preparation method disclosed by the invention has the advantages of simple method, stable structure, low cost and environmental protection, and the prepared porous nanocomposite material has high removal efficiency on the heavy metal ions in water and can be used as a high-efficiency adsorbent of the heavy metal ions in wastewater and even drinking water.

Description

technical field [0001] The invention relates to a preparation method of a porous nanocomposite material and its application in removing heavy metal ions, belonging to the technical field of environmental protection. Background technique [0002] The state of clean water around the world is a growing concern. Heavy metal ions are discharged into water bodies from various sources (including metal processing, fertilizers, electroplating, waste treatment, batteries, paint and fuel combustion, etc.), these elements tend to bioaccumulate and damage the ecological environment, making water heavy metal ion pollution more and more serious , becoming a major environmental threat. Heavy metal ions such as Hg 2+ , Pb 2+ 、Cu 2+ and Cd 2+ With high toxicity and non-degradability (Krabbenhoft, D.P.; Sunderland, E.M., Global Change and Mercury, Science, 2013, 341 (6153), 1457-1458), for human health and environmental protection, heavy metal ion pollutants from wastewater Removal is ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/265B01J20/28004C02F1/288C02F2101/20
Inventor 邱建丁崔伟荣梁汝萍
Owner NANCHANG UNIV
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