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A gas-assisted method for degrading heavy metal ions

A technology of heavy metal ions and heavy metals, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., to achieve the effects of accelerated reaction speed, high adsorption capacity, and high adsorption efficiency

Active Publication Date: 2020-06-16
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art has not been able to find a simple and convenient method that can simultaneously realize the gas consumption of carbon dioxide and the rapid degradation of heavy metals

Method used

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  • A gas-assisted method for degrading heavy metal ions
  • A gas-assisted method for degrading heavy metal ions
  • A gas-assisted method for degrading heavy metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment uses the carbon dioxide assist method provided by the present invention, which specifically includes the following steps:

[0032] The first step, Co(OH) 2 Preparation of nano-ultra-flake layer.

[0033] Using the aqueous solution method, the process is as follows:

[0034] (1). Take 1.33mM CoCl at room temperature 2 ·6H 2 O (0.7595g) in a 5000ml beaker, add 2400ml ultrapure water, seal the mouth of the beaker with plastic wrap, and pass N 2 , Continuous stirring for 30min;

[0035] (2). Take 2.67mM aminoethanol in a 5000ml beaker at room temperature, add 2400ml ultrapure water, seal the mouth of the beaker with plastic wrap, and pass N 2 , Continuous stirring for 30min;

[0036] (3) Pour all the 2400ml aminoethanol solution into the 2400ml CoCl at room temperature 2 ·6H 2 In the beaker of O solution, continue to pass N while stirring 2 , 3h later, and continue to stir for 36h;

[0037] (4) Centrifuge the brown-yellow solution in step (3), wash the resulting precip...

Embodiment 2

[0043] Adjust the conditions in the adsorption process and directly use commercially purchased Co(OH) 2 Particles (purchased from Beijing Yinuokai Technology Co., Ltd.) instead of using self-prepared nano-flaky Co(OH) 2 , And other conditions are the same as in Example 1. Get commercial Co(OH) 2 Access to CO 2 Pb 2+ The adsorption performance.

Embodiment 3

[0049] This embodiment uses the carbon dioxide assist method provided by the present invention, which specifically includes the following steps:

[0050] The first step, nano flake Mg(OH) 2 Preparation.

[0051] Using the aqueous solution method, the process is as follows:

[0052] (1). Take 2.12mM MgCl at room temperature 2 ·6H 2 O (1.077g) in a 5000ml beaker, add 2500ml ultrapure water, seal the mouth of the beaker with plastic wrap, and pass N 2 , Continuous stirring for 30min;

[0053] (2). Take 4.26mM aminoethanol in a 5000ml beaker at room temperature, add 2500ml ultrapure water, seal the mouth of the beaker with plastic wrap, and pass N 2 , Continuous stirring for 30min;

[0054] (3). Pour all the 2500ml aminoethanol solution into the 2500ml MgCl at room temperature 2 ·6H 2 In the beaker of O solution, continue to pass N while stirring 2 , 3h later, and continue to stir for 36h;

[0055] (4) Centrifuge the white solution in step (3), wash the obtained precipitate with ultrapure wa...

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Abstract

The invention relates to the field of heavy metal treatment, in particular to a method of utilizing a metal hydroxide adsorbent to quickly remove heavy metal ions and reach high adsorption rate under gas assistance. The method includes following steps: step 1, taking metal hydroxide, wherein metal is selected from alkaline earth metal and VIIIth-family metal; step 2, dissolving the metal hydroxide in ultrapure water, and ultrasonically treating till complete dissolution to obtain a metal hydroxide water solution; step 3, mixing the metal hydroxide water solution with a solution containing heavy metal ions in an oscillator, and feeding CO2 gas at the same time. The method utilizes adsorption performance of the metal hydroxide, especially high specific surface area and active site of a nano adsorbent to remove heavy metal ions in the presence of carbon dioxide, and quick and efficient degrading effect can be realized.

Description

Technical field [0001] The invention relates to the field of heavy metal processing, and in particular to a method for rapidly removing heavy metal ions with a metal hydroxide adsorbent under the condition of gas assistance, while achieving a high adsorption rate. Background technique [0002] In recent years, with the rapid development of society and economy, more and more industrial and agricultural wastes have been produced. Most of the industrial waste water is directly discharged into the water, causing serious excess of heavy metals in the water and causing serious environmental problems. Heavy metals can directly enter water, soil, and atmosphere, causing direct pollution of various environmental elements, or they can transfer to each other in water, soil, and atmosphere, causing indirect pollution of various environmental elements. At the same time, heavy metals are difficult to degrade. They often participate in the food chain cycle and are easy to accumulate slowly in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/62B01J20/06B01J20/30
CPCB01J20/06C02F1/281C02F2101/20
Inventor 周苇张秋雅郭林
Owner BEIHANG UNIV