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Modified-chitosan and graphite oxide magnetic nano absorbent and preparation and application thereof

A magnetic nanometer and magnetic nanoparticle technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., to achieve simple methods, improved adsorption capacity and selectivity, and good stability. Effect

Inactive Publication Date: 2015-03-25
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the one-step synthesis of chitosan-modified graphite oxide magnetic nano-adsorbents

Method used

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  • Modified-chitosan and graphite oxide magnetic nano absorbent and preparation and application thereof
  • Modified-chitosan and graphite oxide magnetic nano absorbent and preparation and application thereof
  • Modified-chitosan and graphite oxide magnetic nano absorbent and preparation and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of Chitosan Modified Graphite Oxide Magnetic Nanosorbent

[0023] (1) Preparation of graphite oxide: put a 1000 mL beaker into a low-temperature reaction bath, cool to 0°C, add 300 mL of 98% concentrated sulfuric acid and 20 mL of concentrated phosphoric acid, and stir well. Add 2 g of natural flake graphite and 15 g of potassium permanganate while stirring, and then continue to stir for 20 minutes to ensure thorough mixing. Slowly warm up to 50°C and stir for 10h. After the reaction, transfer the reaction system into a 2000 mL beaker, add deionized water to dilute the reaction solution to 1000 mL, and add a certain amount of H 2 o 2 (3%), the reaction solution will turn golden yellow at this moment. Filter while hot, then wash the filter cake with 5% HCl solution and deionized water until there is no sulfate ion in the filtrate (use BaCl 2 solution detection). The filter cake was dried in a vacuum oven at 60 °C for 48 h. Grind through a 200-mesh siev...

Embodiment 2

[0026] Preparation of Chitosan Modified Graphite Oxide Magnetic Nanosorbent

[0027] (1) Preparation of graphite oxide: put a 1000 mL beaker into a low-temperature reaction bath, cool to 0 °C, add 360 mL of 98% concentrated sulfuric acid and 40 mL of concentrated phosphoric acid, and stir well. Add 3 g of natural flake graphite and 18 g of potassium permanganate while stirring, and then continue stirring for 30 min to ensure thorough mixing. Slowly raise the temperature to 50°C and stir for 12 h. After the reaction, the reaction system was transferred to a 2000 mL beaker, and deionized water was added to dilute the reaction solution to 1400 mL, and a certain amount of H 2 o 2 (3%), the reaction solution will turn golden yellow at this moment. Filter while hot, then wash the filter cake with 5% HCl solution and deionized water until there is no sulfate ion in the filtrate (use BaCl 2 solution detection). The filter cake was dried in a vacuum oven at 60 °C for 48 h. Grind...

Embodiment 3

[0030] Preparation of Chitosan Modified Graphite Oxide Magnetic Nanosorbent

[0031] (1) Preparation of graphite oxide: put a 1000 mL beaker into a low-temperature reaction bath, cool to 0 °C, add 330 mL 98% concentrated sulfuric acid and 30 mL concentrated phosphoric acid, and stir well. Add 2.5 g of natural flake graphite and 16.5 g of potassium permanganate during stirring, and then continue stirring for 25 minutes to ensure thorough mixing. Slowly warm up to 50°C and stir for 11h. After the reaction, transfer the reaction system into a 2000 mL beaker, add deionized water to dilute the reaction solution to 1200 mL, and add a certain amount of H 2 o 2 (3%), the reaction solution will turn golden yellow at this moment. Filter while hot, then wash the filter cake with 5% HCl solution and deionized water until there is no sulfate ion in the filtrate (use BaCl2 solution detection). The filter cake was dried in a vacuum oven at 60 °C for 48 h. Grind through a 200-mesh sieve...

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Abstract

The invention discloses a modified-chitosan and graphite oxide magnetic nano absorbent and a preparation and application of the modified-chitosan and graphite oxide magnetic nano absorbent, and belongs to the field of absorbing material preparation. By the adoption of a one-step thermal solvent method, functional monomer chitosan and graphite oxide are directly added to a magnetic source environment with the high-temperature and high-pressure conditions, and a solid-phase extraction material is formed in a synthesis mode. The synthesis method is simple, the process is easy to control, a great number of functional groups of the graphite oxide and chitosan are combined, the absorbent has excellent absorption function, firm in bonding, stable in property, good in ruggedness, larger in enrichment factor, capable of being used in a wider PH value range and suitable for enrichment pretreatment of trace amount Cu (II) in the environmental water sample.

Description

technical field [0001] The invention belongs to the field of adsorption material preparation, and in particular relates to a chitosan-modified graphite oxide magnetic nano-adsorbent and a preparation method and application thereof. Background technique [0002] With the development of industry, a large amount of metal ions flow into the environment, causing environmental pollution and seriously endangering human health. Therefore, it is very important to detect heavy metal ions and remove heavy metal ions from environmental samples. At present, the separation of heavy metal ions mainly includes chemical precipitation, liquid-liquid extraction, solvent extraction and solid phase extraction. Among them, solid phase extraction (SPE) has become the most commonly used pretreatment technology due to its advantages such as simple operation, low consumption of organic solvents, high recovery rate and enrichment multiple, and easy combination with other instruments. In solid phase ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
CPCB01J20/24B01J20/28007B01J20/28009C02F1/288
Inventor 吕海霞王晓明谢增鸿
Owner FUZHOU UNIV
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