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Method used for separating and/or extracting radioactive metal cations

A metal cation and radioactive technology, which is applied in the field of water treatment containing radioactive metal cations, can solve the problems of unreached residue, poor selectivity, and low adsorption amount, and achieve the effect of low residue, high removal rate, and high adsorption amount

Inactive Publication Date: 2019-04-12
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, applied to remove Ba 2+ (radioactivity 226 Ra 2+ Ion exchangers mainly include zeolite, clay, titanate nanomaterials, niobate materials, etc., but the existing materials have disadvantages such as low adsorption capacity and poor selectivity.
On the other hand, removing Ni 2+ 、Co 2+ The ion exchange / adsorption materials mainly include zeolite, clay, activated carbon, etc., which mainly have problems such as poor selectivity and residual content that do not meet the drinking water standards of WHO.

Method used

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  • Method used for separating and/or extracting radioactive metal cations
  • Method used for separating and/or extracting radioactive metal cations
  • Method used for separating and/or extracting radioactive metal cations

Examples

Experimental program
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Effect test

Embodiment 1

[0057] [Sn 3 S 7 ] n 2n- The preparation of the two-dimensional skeleton material refers to Example 1 in the Chinese patent application whose publication number is CN104399538, and the selected [Sn 3 S 7 ] n 2n- The two-dimensional framework material is a compound [Me 2 NH 2 ] 4 / 3 [Me 3 NH] 2 / 3 sn 3 S 7 1.25H 2 O, which is only described in this application [Sn 3 S 7 ] n 2n- A typical representative of two-dimensional framework materials, described in this application [Sn 3 S 7 ] n 2n- Two-dimensional framework materials are not limited thereto. [Me 2 NH 2 ] 4 / 3 [Me 3 NH] 2 / 3 sn 3 S 7 1.25H 2 The synthetic method of O (sample 1#) is specifically:

[0058] Mix tin source, sulfur source, dimethylamine aqueous solution and water according to a certain molar ratio, fully stir at room temperature, seal it into a stainless steel reactor lined with polytetrafluoroethylene, react at a certain temperature for a period of time, and then naturally cool down ...

Embodiment 2

[0063] Embodiment 2 utilizes [Sn 3 S 7 ] n 2n- Exchange Kinetics Test of Two-Dimensional Framework Materials for the Removal and Recovery of Radioactive Metal Cations

[0064] Sample 1# to Ba 2+ 、Ni 2+ 、Co 2+ The specific steps of the ion exchange kinetics experiment are as follows: the ground powder sample 1# respectively reacts with a certain initial concentration of Ba 2+ 、Ni 2+ 、Co 2+ The aqueous solution of ions is at 25°C, under the condition of V (solution volume): m (mass of exchanger) = 1000mL / g, the supernatant is taken at regular intervals to measure the ion concentration therein. The result is as figure 2 As shown, it can be seen from the figure that the sample 1# is to Ba 2+ 、Ni 2+ 、Co 2+ The ion exchange can reach equilibrium within 5 minutes, and the residual amount reaches the WHO standard for drinking water.

Embodiment 3

[0065] Embodiment 3 utilizes [Sn 3 S 7 ] n 2n- Adsorption model testing of two-dimensional framework materials for the removal and recovery of radioactive metal cations

[0066] Sample 1# to Ba 2+ 、Ni 2+ 、Co 2+ The specific steps of the ion adsorption model experiment are as follows: the ground powder sample 1# is subjected to different initial concentrations of Ba 2+ 、Ni 2+ 、Co 2+ The ionic aqueous solution was exchanged for 24 hours at 25°C, V (solution volume): m (mass of exchanger) = 1000mL / g, and the supernatant and initial solution were taken to measure the ion concentration. The result is as image 3 As shown, it can be seen from the figure that the sample 1# is to Ba 2+ 、Ni 2+ 、Co 2+ The adsorption capacity of ions can reach 289.04mg / g, 83.64mg / g, 51.98mg / g respectively.

[0067] Sample 1# to Ba 2+ The adsorption amount of ions reached 148% of the theoretical value. Using X-ray photoelectron spectroscopy to exchange Ba 2+ 、Ni 2+ 、Co 2+ Sample 1# befor...

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Abstract

The present application discloses a method used for separating and / or extracting radioactive metal cations. The method is characterized in that an ion exchange agent is put into a liquid containing the radioactive metal cations, contact is performed for not less than 5 min at 20-80 DEG C, and therefore the radioactive metal cations are captured and separated by the ion exchange agent. The method provided by the invention has the advantages of a high speed of capturing the radioactive ions, a high adsorption amount, high selectivity, excellent resistance to beta and gamma ray irradiation, a high removal rate and a low residual amount when the radioactive metal cations are removed, and the residual amount reaches the world health organization (WHO) standard for drinking water quality; and the radioactive metal cations in a [Sn3S7]n<2n-> two-dimensional framework material can be eluted by a simple, inexpensive and environmentally-friendly method, and the method has important meaning for high-efficiency removal and recycle of the radioactive metal cations in the water environment.

Description

technical field [0001] The application relates to a method for separating and / or extracting radioactive metal cations, which belongs to the technology of water treatment containing radioactive metal cations in the field of environmental protection. Background technique [0002] Energy and the environment have always been two hot issues in today's society. Due to the non-renewability of fossil energy itself and the inevitable environmental pollution in the process of utilization, human beings are focusing on new energy sources such as nuclear energy, solar energy, and wind energy. Among them, nuclear energy is regarded as an efficient and clean energy, and is favored by many countries. On November 2, 2007, China issued the "Nuclear Power Medium- and Long-Term Development Plan (2005-2020)", marking the adjustment of my country's nuclear power development policy from "moderate development" to "active development". But people's acceptance of nuclear energy is closely related t...

Claims

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Application Information

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IPC IPC(8): G21F9/12C22B7/00C22B23/00C22B26/20
CPCC22B7/006C22B23/0461C22B26/20G21F9/12Y02P10/20
Inventor 高玉洁冯美玲黄小荥
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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