Method for preparing composite adsorption material used for absorbing rubidium and cesium ions

A composite adsorption material and ion technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve problems such as fragility, waste of adsorbents, and large volume shrinkage

Active Publication Date: 2017-04-05
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, gel beads usually shrink greatly when dried and are easily broken; due to the lack of strong interaction between nanofibers, the overall strength of the material is low; in the polymer film, because part of the adsorbent is covered by polymer, it is difficult to Effective contact with the solution, resulting in reduced adsorption capacity and waste of adsorbent, also limits its practical application

Method used

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  • Method for preparing composite adsorption material used for absorbing rubidium and cesium ions
  • Method for preparing composite adsorption material used for absorbing rubidium and cesium ions

Examples

Experimental program
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Effect test

Embodiment 1

[0010] Example 1: Preparation of polydopamine / ferric ferrocyanide composite adsorption functional film

[0011] Dissolve dopamine (PODA) in Tirs-HCl buffer solution (pH8.5), then put the polyethersulfone porous membrane into the solution to polymerize for 10h, wash and dry; then put the above membrane in K 4 Fe(CN) 6 Fully soaked in the solution for 24 hours, the solution starts to be colorless, and turns light yellow after a period of time, indicating that ferrocyanide crystal nuclei have been formed. Rinse the membrane and put in 0.1M FeCl 3 The solution was grown, and after 24 hours, it was taken out, washed and dried to obtain polydopamine / ferric ferrocyanide composite adsorption functional film ( figure 1 ). The prepared adsorption functional membrane was used for 50ml 10ppm Cs respectively + , Rb + , Li + 、Na + 、K + and Ca 2+ Adsorption of the solution, for Rb + The adsorption capacity reaches 87mg / g, for Cs + The adsorption capacity reaches 95mg / g, and it has ...

Embodiment 2

[0012] Embodiment 2: the preparation of polycaffeic acid / copper ferricyanide composite adsorption sponge

[0013] Put the polyurethane sponge into the caffeic acid solution and irradiate it with γ-rays for 1 h to obtain the polyurethane sponge grafted with polycaffeic acid on the surface; then put the sponge into Cu 2+ Fully soak in the solution, take out and wash after 6 hours, and then put in 0.05M Fe(CN) 6 3- Nucleation and growth in the solution, repeating the above process can increase the thickness of the adsorption layer, and finally obtain polycaffeic acid / copper ferricyanide composite adsorption sponge, which is used for 50ml 10ppm Cs + The solution is adsorbed, and the adsorption capacity reaches 105mg / g.

Embodiment 3

[0014] Example 3: Preparation of polycatechin / ammonium phosphotungstate composite adsorption resin

[0015] Put the polystyrene resin (PS-DVB) into the catechin solution for adsorption for 6 hours, then immerse the resin in concentrated sulfuric acid for cross-linking for 1 hour to obtain a resin coated with polycatechin on the surface; immerse the resin in 0.1M phosphotungstic acid Adsorb in the aqueous solution for 8 hours, take it out and dry it, then add 0.05M NH 4 Nucleation and growth were carried out in Cl solution, and finally polycatechin / ammonium phosphotungstate composite adsorption resin was obtained, which were used in 50ml 10ppm Rb + and Cs + The solution is adsorbed, and the adsorption capacity reaches 80mg / g and 90mg / g respectively.

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Abstract

The invention belongs to the technical field of a functional material, and discloses a method for preparing a composite adsorption material used for absorbing rubidium and cesium ions. The method is characterized in that a polymer layer containing an o-dihydroxybenzene structure is prepared through in-situ polymerization on the surface of a porous material, then am ion exchange function nano adsorbent layer is subjected to in-situ growth on the surface of the polymer layer, and the composite adsorption material can be obtained. The polymer layer on the surface of the porous material has strong rubidium caesium complexation and adsorption functions, has strong adhesion effect on a porous material and the ion exchange function adsorbent, greatly increase the stability of the composite adsorption material, is in favor of in-situ growth of the adsorbent, and can adjust and control the granularity of the adsorbent layer; during adsorption, a solution and the adsorbent are fully contacted, and are connected with the polymer layer through particle gaps of the adsorbent, synergism is used for absorbing rubdium and cesium, the adsorption capacity is high, and the composite adsorption material can be used for absorbing rubidium and caesium in salt lake brine and absorbing caesium in radioactivity waste water.

Description

[0001] The invention belongs to the technical field of functional materials. Background technique [0002] Rubidium and cesium have strong chemical activity and excellent photoelectric properties, and are widely used in electronic devices, catalysts, biomedicine, medicine, magnetic fluid power generation, thermal ion conversion power generation and other fields. Salt lake brine is rich in elements such as potassium, sodium, magnesium, calcium, lithium, boron, and chlorine, as well as scattered elements such as rubidium, cesium, uranium, and thorium. The reserves of rubidium and cesium are huge, and they are important rubidium and cesium liquid mineral resources in my country. In addition, radioactive waste water contains radionuclides 137 Cs, which has the characteristics of high radioactivity, long half-life, and large heat release, needs to be separated and removed. [0003] The separation and extraction methods of rubidium and cesium in salt lake brine and cesium in radioa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30G21F9/12
CPCB01J20/265B01J20/28054B01J2220/4812G21F9/12
Inventor 贾志谦程肖雪
Owner BEIJING NORMAL UNIVERSITY
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