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Method for dynamically adsorbing heavy metals in solution and application thereof

A dynamic adsorption, heavy metal technology, applied in the direction of solid adsorbent liquid separation, separation methods, chemical instruments and methods, etc., can solve the problems of high cost, difficult to apply on a large scale, low adsorption capacity, etc., to achieve low cost, easy recovery and Reusable, fast mass transfer effect

Active Publication Date: 2020-01-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the impact of material cost is particularly obvious in large-scale applications. Materials with high adsorption capacity are mostly expensive and difficult to apply on a large scale.
[0008] The adsorption of heavy metals is mainly based on static adsorption (Static adsorption). The quantitative adsorbent and the quantitative solution are fully contacted for a long time to reach equilibrium. It is an intermittent operation process, and the adsorption capacity of this method is low.

Method used

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  • Method for dynamically adsorbing heavy metals in solution and application thereof
  • Method for dynamically adsorbing heavy metals in solution and application thereof
  • Method for dynamically adsorbing heavy metals in solution and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0065] This embodiment provides a method for dynamically adsorbing uranium metal in a solution and a method for calculating the amount of uranium adsorbed.

[0066] 1. Preparation of functional fiber membrane

[0067] (1) Preparation of grafted cellulose: Weigh 1g of cellulose and disperse it in 150mL of water to mechanically break up, then add the evenly dispersed cellulose solution into a 250mL three-neck flask, keep stirring in a constant temperature water bath at 60°C, and keep Nitrogen was introduced. After adding 0.54mL of sulfuric acid (50% v / v) solution, continue to stir for 30min; dissolve 0.45g of ammonium persulfate into 10mL of deionized water, then slowly add to the above solution and continue to stir for 30min; slowly add 10mL of Acrylonitrile, continue to stir the reaction under nitrogen atmosphere for 2h. After the reaction is completed, the grafted cellulose is directly separated by filtration, washed repeatedly with deionized water, and finally dried and co...

Embodiment 2

[0079] The difference from Example 1 is that only one polyacrylonitrile fiber membrane is used for dynamic adsorption of heavy metals.

[0080] After calculation, when the breakthrough point is reached, the breakthrough time is 20min, and the solution volume flowing through the functional fiber membrane bed is 60mL, which is equivalent to 26 bed volumes. After adsorption for 600min, the adsorption capacity of uranium on the bed is Q 600min = 6 mg.

Embodiment 3

[0082] The difference from Example 1 is that 3 polyacrylonitrile fiber membranes are used for dynamic adsorption of heavy metals.

[0083] After calculation, when the breakthrough point is reached, the breakthrough time is 298min, and the solution volume flowing through the functional fiber membrane bed is 894mL, which is equivalent to 387 bed volumes. After 600min of adsorption, the adsorption capacity of uranium on the bed is Q 600min = 16 mg.

[0084] The adsorption curve of embodiment 1~3 is as image 3 shown, where C t Indicates the uranium concentration in the effluent, C 0 Represents the uranium concentration in the initial solution. It can be seen that when using 3 functional fiber membranes, the dynamic adsorption efficiency is significantly higher than using 1 or 2 filter membranes, but the amount of uranium adsorbed by each functional fiber membrane is basically the same.

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Abstract

The invention provides a method for dynamically adsorbing heavy metals in a solution and application thereof. The method comprises the following steps: taking a functional fiber membrane as an adsorption medium, enabling a solution containing heavy metals to flow through the adsorption medium, and then flushing the adsorption medium by adopting a flushing agent to realize regeneration of the adsorption medium and recovery of the heavy metals, wherein the functional fiber membrane contains modified groups, and the modified groups are any one or a combination of more than two of amino group, amidoxime group, phosphate group and sulfydryl. The continuous adsorption of metal ions is realized by adopting a dynamic adsorption method, the continuous operation of the adsorption process is realized, and the adsorption efficiency is improved. Meanwhile, the surface of the functional fiber membrane provided by the invention has the modified groups, the specific surface area is large, target metals, especially uranium metal, can be efficiently adsorbed, and the method is simple to operate and easy for regeneration of the adsorption medium and recovery of heavy metals.

Description

technical field [0001] The invention relates to an adsorption separation method, in particular to an adsorption method for heavy metals in a solution, in particular to a method for dynamically adsorbing heavy metals in a solution and its application. Background technique [0002] With the development of the economy, the discharge of industrial wastewater is becoming more and more serious, especially the migration and enrichment of heavy metal ions, which will have a huge impact on the environment and human health. Among them, uranium, as a radioactive pollutant, will cause radioactive damage to human health, and has been regarded as one of the priority pollutants in water bodies. [0003] Adsorption method is considered to be one of the important methods to remove heavy metal ions in water. It has the characteristics of simple operation, good adsorption effect, no secondary pollution and reusable utilization, and plays an important role in the removal of heavy metal ions in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D15/10B01D15/42B01D61/14B01D65/02C02F1/28C02F1/44G21F9/12C02F103/08C02F101/20
CPCB01D15/10B01D15/424B01D61/147B01D65/02B01D2311/2626B01D2321/16C02F1/286C02F1/444C02F2101/006C02F2101/20C02F2103/08C02F2303/16G21F9/12
Inventor 李望良李艳香王莹
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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