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Preparation method and application of amidation modified magnetic chitosan microspheres

A chitosan microsphere, amidation technology, applied in chemical instruments and methods, inorganic chemistry, radioactive purification, etc., can solve the problems of adsorption of metal ions, separation of chitosan by adsorption matrix, etc., to achieve enhanced chelation ability, Realize the effect of multiple utilization and good removal ability

Inactive Publication Date: 2019-10-25
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is to solve the technical problem that chitosan cannot adsorb metal ions in an acidic environment and the chitosan after adsorption is difficult to separate from the adsorbed matrix, and provides an amidation improved Preparation method and application of magnetic chitosan microspheres

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  • Preparation method and application of amidation modified magnetic chitosan microspheres
  • Preparation method and application of amidation modified magnetic chitosan microspheres
  • Preparation method and application of amidation modified magnetic chitosan microspheres

Examples

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Embodiment 1

[0029] (1) 5.0mmol Fe(NO 3 ) 3 9H 2 O and 2.5mmol Co(NO 3 ) 2 ·6H 2 Disperse O in 60ml of distilled water, mix and stir for 30-60min, adjust the pH of the solution to 12 with NaOH, stir magnetically for 30-60min, and transfer the mixed solution into a 100ml Teflon-lined reactor. The reaction temperature is 180° C., and the reaction time is 24 hours. After the reaction is completed, wash with deionized water and absolute ethanol, and know that the pH of the supernatant is close to neutral, and freeze-dry at low temperature for 24 hours to obtain dispersed and uniform CoFe particles.2 o 4 nanoparticles.

[0030] (2) 3g chitosan is dissolved in the 2% acetic acid solution of 150ml, is mixed with transparent chitosan solution, the 3g CoFe prepared by step (1) 2 o 4 Disperse the nanoparticles in the above solution, stir evenly, and polymerize by inverse emulsion, add 200ml cyclohexane and 1.1ml Span 80, mix well, add 1ml glutaraldehyde with a mass fraction of 50%, Schiff ba...

Embodiment 2

[0035] Prepare 14 parts of 50ml U(VI) buffer solution with an initial concentration of 100mg / L and divide them into two groups. Each group uses 1mol / L nitric acid or sodium hydroxide to adjust the pH to 1M respectively (M is 1mol / L, the same below) 0.5M, 0.2M, 1, 2, 3, 4. Get wherein one group of buffer solution, in the buffer solution of this group of different pH values, add respectively the amidated modified magnetic chitosan microsphere that 0.05g embodiment 1 makes; Get another group of buffer solution, add to this group of different pH The prepared magnetic chitosan microspheres were added to the buffer solution of the value. Then, place the two groups of buffer solutions in a constant temperature oscillator in a water bath, keep the temperature at 25°C, and rotate at 150r / min. After shaking for 10 hours, use a magnet to place the amidated modified magnetic chitosan microspheres or Microspheres are separated from wastewater to complete the treatment of U(VI). The unads...

Embodiment 3

[0040] Thirteen elements from lanthanides, actinides and transition metals were selected as competing ions. The competing ion is: La 3+ 、Ce 3+ 、Pr 3+ 、Nd 3+ 、Sm 3+ 、Eu 3+ 、Gd 3+ , Yb 3+ 、Lu 3+ , Y 3+ , Zn 2+ 、Ni 2+ 、Sr 2+ . Make U(VI) and the other 13 ions coexist at an equal mass concentration (100 mg / L), and adjust the pH of the mixture containing U(VI) and the other 13 ions to 4.0. Get 50ml of the mixed solution, add 0.05g of the amidated modified magnetic chitosan microspheres prepared in Example 1 to the mixed solution, then place the buffer solution in a water bath constant temperature oscillator, keep the temperature at 25°C, and After shaking at 150r / min for 10 hours, use a magnet to separate the amidated modified magnetic chitosan microspheres or magnetic chitosan microspheres from the wastewater to complete the treatment of the mixed solution. The content of 14 kinds of metal ions that were not adsorbed in the wastewater was measured with an inductively...

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Abstract

The invention discloses a preparation method and application of amidation modified magnetic chitosan microspheres. The preparation method of the amidation modified magnetic chitosan microspheres specifically comprises the following steps: CoFe2O4 nano-particles are synthesized by adopting a hydrothermal method; magnetic chitosan microspheres are formed under a cross-linking effect of glutaraldehyde through a reversed-phase emulsion polymerization method; and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) is grafted onto the magnetic chitosan microspheres through an amide reaction, so thatthe amidation modified magnetic chitosan microspheres are obtained. The amidation modified magnetic chitosan microspheres prepared by the preparation method disclosed by the invention have good mechanical properties and sufficient adsorption sites, so that adsorption capacity to U(VI) in wastewater is large, and removal capability is good. The amidation modified magnetic chitosan microspheres adsorbing U(VI) can be quickly separated and analyzed from an adsorbed substrate (wastewater) by a magnetic field, and a new way is provided for U(VI) removal in wastewater.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation method and application of amidation modified magnetic chitosan microspheres. Background technique [0002] As a typical actinide element, uranium can produce a large amount of radioactive daughter substances, which poses a serious threat to environmental safety and ecosystems. In addition, uranium can cause damage to the body's kidneys, brain, and even DNA structure. Therefore, it is very important to remove and recover U(VI) from aqueous solution. In the past ten years, many technologies applied to U(VI) elimination have been widely studied, and commonly used treatment methods include solvent extraction, chemical precipitation, ion exchange, evaporation, biosorption, etc. Adsorption is widely used in the removal of radionuclides in polluted wastewater due to its low cost, high flexibility and wide adaptability. [0003] The traditional adsorbent is activ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28G21F9/12B01J20/30
CPCB01J20/06B01J20/24B01J20/28009B01J20/28021G21F9/12
Inventor 唐凯钟成华
Owner CHONGQING TECH & BUSINESS UNIV
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