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Nano composite adsorbent as well as preparation method and application thereof

A nano-composite material and adsorbent technology, applied in the field of materials, can solve the problems of poor adsorption stability, poor selectivity, slow adsorption speed, etc., and achieve the effects of high adsorption capacity, fast adsorption speed, and simple preparation method.

Active Publication Date: 2018-12-28
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional uranium adsorption materials have defects such as low adsorption capacity, poor selectivity, poor adsorption stability, or slow adsorption speed in practical applications. It is of great significance to find new adsorption materials for uranium to overcome the shortcomings of traditional adsorption materials.

Method used

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  • Nano composite adsorbent as well as preparation method and application thereof
  • Nano composite adsorbent as well as preparation method and application thereof
  • Nano composite adsorbent as well as preparation method and application thereof

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Embodiment 1

[0030] Such as figure 1 Shown, the PAA / SWCNH-NH of the present invention 2 The preparation method of nanocomposite adsorbent comprises the following steps:

[0031] Step 1: Modification of SWCNH (SWCNH-COOH)

[0032] Disperse 100-200 mg of SWCNH into 200-300 mL of nitric acid solution and reflux at 100-120 ° C for 24-30 hours to obtain a carboxylated SWCNH dispersion, which is centrifuged, washed and filtered with deionized water for several times until the filtrate becomes Neutralize, then vacuum dry, then disperse the carboxylated single-walled carbon nanohorns in deionized water, and make a dispersion of 0.5-1.0 mg / mL for use;

[0033] Step 2: p-phenylenediamine functionalized SWCNH (SWCNH-NH 2 )

[0034] Carboxylated single-walled carbon nanohorns and p-phenylenediamine are used as reaction raw materials, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide are used as reaction materials. Catalyst, under the protection of nitrogen, ...

Embodiment 2

[0038] The present invention also provides a kind of said PAA / SWCNH-NH 2 The nanocomposite adsorbent is used as a method for separating and enriching uranium, and its specific operation is as follows:

[0039]Adjust the hydrogen ion concentration (pH value) of the uranium-containing aqueous solution to be treated, then add an adsorbent, shake, and adsorb, wherein the concentration of the uranium-containing aqueous solution is 50 mg / L, the pH value range is between 2.5 and 7.0, and the oscillation speed is 90 ~120r / min. The adsorption temperature is 25°C, and the adsorption time is 20-200 minutes. The adjustment of the pH value uses 1 to 10 mol / L of HNO 3 solution, and 1-5 mol / L NaOH solution to adjust the pH of the solution. The absorbance was measured by Arsenazo III method, the concentration of uranium in the solution before and after adsorption was analyzed, and the adsorption amount of uranium was calculated to calculate the adsorption amount.

[0040] This embodiment ...

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Abstract

The invention provides a nano composite adsorbent as well as a preparation method and an application thereof. The preparation method comprises the following steps: dispersing SWCNH into a nitric acidsolution for modification to obtain carboxylated SWCNH; catalyzing carboxylated SWCNH and p-phenylenediamine as reaction raw materials by a catalyst under protection of nitrogen to obtain SWCNH-NH2 nanofiller; mixing and stirring 3,3',4,4'-biphenyltetracarboxylic dianhydride with anhydrous N,N-dimethylacetamide until complete dissolution to obtain a solution I; adding the SWCNH-NH2 nanofiller to the solution I, and performing stirring in an ice-water mixture environment at 0 DEG C to obtain a solution II; adding p-phenylenediamine to the solution II, continuing to stir at a low temperature toenable reactants to be fully reacted, and finally obtaining a viscous pale yellow polyamic acid solution which is uniformly dispersed. The prepared PAA / SWCNH-NH2 nanocomposite adsorbent has high adsorption capacity for uranyl ions in an aqueous solution, high adsorption speed, good reusable effect and strong selective adsorption capacity for uranium ions, and can effectively adsorb and recover uranyl ions from the aqueous solution.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a nanocomposite adsorbent and its preparation method and application. Background technique [0002] In recent years, nuclear energy has been widely developed as a relatively clean energy source, and the demand for uranium (one of the most important elements in the development of nuclear energy) has been increasing. At present, its main sources in the environment mainly include: solid and Liquid waste, slag of uranium-containing minerals (such as uranium-containing phosphate rock), nuclear fuel processing and spent fuel reprocessing waste, etc. Due to its radioactivity, once exposed to the environment, it will pose serious hazards to human health and ecosystems. Due to the great application value of uranium and the duality of its harmfulness to the human body and the environment, the safe use of uranium and the proper reprocessing, detection, separation and recovery of uranium ...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30G21F9/12
CPCB01J20/22B01J20/30G21F9/12
Inventor 许剑平王春艳王化宁钱勇
Owner EAST CHINA UNIV OF TECH
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