CN114345919B - Method for leaching and repairing arsenic-polluted soil by amino acid ionic liquid - Google Patents
Method for leaching and repairing arsenic-polluted soil by amino acid ionic liquid Download PDFInfo
- Publication number
- CN114345919B CN114345919B CN202111661702.0A CN202111661702A CN114345919B CN 114345919 B CN114345919 B CN 114345919B CN 202111661702 A CN202111661702 A CN 202111661702A CN 114345919 B CN114345919 B CN 114345919B
- Authority
- CN
- China
- Prior art keywords
- soil
- arsenic
- leaching
- ionic liquid
- lysine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for restoring arsenic-polluted soil by leaching amino acid ionic liquid, and belongs to the field of soil restoration. According to the invention, the amino acid ionic liquid is firstly used as the soil eluting agent and then used for eluting and repairing the arsenic-polluted soil, and the removal rate of the eluting agent on arsenic in the soil is more than 90%. The method of the invention utilizes the amino acid ionic liquid soil eluting agent, can efficiently remove the heavy metals in the soil and relieve the harm of the heavy metals to the environment.
Description
Technical Field
The invention relates to a method for restoring arsenic-polluted soil by leaching amino acid ionic liquid, belonging to the field of soil restoration.
Background
With the continuous development of economy, artificial activities such as industrial production, agricultural irrigation and daily life cause a large amount of heavy metals to enter soil. The health problem caused by heavy metal pollution of soil causes wide attention of all social circles. Heavy metals are irreversible, complex and long-lasting, can be enriched in living organisms and are harmful to human health through the food chain. Arsenic is a highly toxic heavy metal, and the arsenic pollution of soil in China is serious, so that the development of a technology for repairing the arsenic-polluted soil is urgently needed.
The chemical leaching transfers heavy metals from a soil solid phase to a leaching liquid phase through the eluting agent, so that the heavy metals are removed, and the migration and conversion capacity of the heavy metals is reduced. The chemical leaching has the advantages of economy, high efficiency and the like, and is widely applied to remediation of heavy metal contaminated soil. The key to chemical leaching is the choice of the eluent, so that the search for an environmentally friendly and efficient eluent is crucial.
Disclosure of Invention
The first purpose of the invention is to provide a method for eluting and repairing arsenic-polluted soil by using amino acid ionic liquid, wherein the method uses a lysine phosphate ionic liquid aqueous solution as an eluting agent to elute the arsenic-polluted soil.
In one embodiment of the invention, the leaching is to mix a leaching agent with the arsenic-contaminated soil and shake for 1-3 h.
In one embodiment of the invention, the arsenic is present in the arsenic-contaminated soil in the form of anions.
In an embodiment of the present invention, the method specifically includes:
(1) Mixing the eluting agent with arsenic-polluted soil, eluting, and then carrying out solid-liquid separation;
(2) Repeatedly leaching the soil subjected to solid-liquid separation in the step (1) by using a leaching agent according to the step (1);
(3) And (3) leaching the soil subjected to solid-liquid separation in the step (2) with deionized water according to the method in the step (1).
In one embodiment of the invention, the repeated rinsing is 1 to 5 times of rinsing.
In one embodiment of the present invention, the solid-liquid separation is one of still standing and centrifugation.
In one embodiment of the present invention, the molar ratio of phosphoric acid to lysine in the phospholysine ionic liquid is 1 to 1, and the ratio is preferably 1.
In one embodiment of the invention, the concentration of the lysine phosphate ionic liquid aqueous solution is 0.1 to 0.5mol/L, and the preferred concentration of the lysine phosphate ionic liquid aqueous solution is 0.3mol/L.
In one embodiment of the invention, in step (2), the volume ratio of the eluting agent to the arsenic-contaminated soil is 3-6, and the preferred volume ratio of the eluting agent to the arsenic-contaminated soil is 4.
In one embodiment of the present invention, the preparation method of the lysine phosphate ionic liquid comprises the following steps: dissolving phosphoric acid and lysine in water to prepare a mixed solution, placing the obtained mixed solution in a condensing device for reaction, drying a reaction product, and obtaining the dried product, namely the lysine phosphate ionic liquid.
The second purpose of the invention is to apply the phosphoric acid amino acid ionic liquid in the field of soil remediation.
[ advantageous effects ]
Compared with the conventional inorganic acid, organic acid and EDTA eluting agent, the eluting agent used in the soil eluting method has the advantages that:
(1) The arsenic removal rate of the soil polluted by arsenic with different degrees is up to more than 90 percent, and the method is suitable for the soil polluted by arsenic of various pollution sources.
(2) Is suitable for clay and other soil with different properties.
(3) The dosage of the eluting agent is small.
(4) The solid-liquid separation of the leached soil is simple, and complex treatment is not needed.
Drawings
FIG. 1 shows the removal rate of arsenic in arsenic-containing soil at low concentration (soil sample 1), medium concentration (soil sample 2) and high concentration (soil sample 3) in water solutions of lysine phosphate ionic liquid with different concentrations.
FIG. 2 shows the removal rate of arsenic from low (sample 1), medium (sample 2) and high (sample 3) arsenic-containing soils at different liquid-soil ratios.
Detailed Description
The present invention is further described below with reference to examples, but the embodiments of the present invention are not limited thereto.
The arsenic removal rate calculation mode is as follows:
in the formula: c-arsenic concentration (mg. L) in leached solution -1 )；
V-volume of leacheate (L);
C 0 arsenic concentration in soil (mg. Kg) -1 )；
W is soil mass (g).
The arsenic-contaminated soils of the following examples and comparative examples had arsenic contents of 90 to 1400mg/kg, with low, medium and high concentrations of 90.8mg/kg, 453mg/kg and 1396mg/kg, respectively.
Example 1
Preparing a lysine phosphate ionic liquid:
(1) Pouring 5.13mL of 85% phosphoric acid and 11.0g of lysine into a beaker, uniformly stirring, and diluting to 250mL with deionized water;
(2) Putting the solution prepared in the step (1) into a 500mL round-bottom flask provided with a condensing device, and reacting for 8h at a constant temperature of 60 ℃;
(3) And (3) washing the product obtained in the step (2) for multiple times by using ethyl acetate, and drying at room temperature to obtain the dried product, namely the lysine phosphate ionic liquid.
Weighing 5.00g of high-concentration arsenic-polluted soil, respectively adding 20mL of 0.3mol/L lysine phosphate ionic liquid aqueous solution at a liquid-soil ratio of 4:1, oscillating for 2h, centrifuging for 10min at 4000r/min, separating solid from liquid, repeatedly leaching the separated soil with the lysine phosphate ionic liquid aqueous solution for 2 times according to the leaching steps, finally leaching the separated soil with deionized water, naturally drying the repeatedly leached soil, measuring the arsenic content in the soil, and finally calculating to obtain the arsenic removal rate of 95.69%.
Example 2
Weighing 5.00g of low-concentration, medium-concentration or high-concentration arsenic-polluted soil, adding 0.1, 0.2, 0.3, 0.4 and 0.5mol/L of the lysine phosphate ionic liquid aqueous solution prepared in the example 1 respectively according to the liquid-soil ratio of 4:1, oscillating for 2h, centrifuging for 10min at 4000r/min, separating solid from liquid, repeatedly leaching the separated soil for 2 times by using the lysine phosphate ionic liquid aqueous solution (prepared in the example 1) according to the leaching steps, finally leaching the separated soil by using deionized water, naturally drying the repeatedly leached soil, and measuring the arsenic content in the soil.
As can be seen from FIG. 1, the arsenic removal rates for low, medium and high concentration soils all increased with increasing concentration of the eluent. When the concentration of the eluting agent is 0.1-0.3 mol/L, the arsenic removal rate of the three kinds of soil is increased rapidly along with the increase of the concentration. When the concentration of the eluting agent exceeds 0.3mol/L, the arsenic removal rate of the three kinds of soil is basically unchanged. When the concentration of the eluting agent is 0.5mol/L, the arsenic removal rate of the three kinds of soil reaches the highest. However, the arsenic removal rates of the three soils varied by less than 5% as compared with the eluent concentration of 0.3mol/L, and it is preferable that the eluent concentration be 0.3mol/L and the arsenic removal rates of the three soils of low, medium and high concentrations be 92.41%, 90.65% and 95.69% at the eluent concentration of 0.3mol/L, respectively, in view of cost.
Example 3
Weighing 5.00g of low-concentration, medium-concentration or high-concentration arsenic-polluted soil, respectively adding 0.3mol/L of lysine phosphate ionic liquid aqueous solution prepared in example 1 according to liquid-soil ratios of 2: 1, 3: 1, 4:1, 5: 1 and 6:1, oscillating for 2h, and centrifuging for 10min at 4000r/min to separate solid and liquid, repeatedly leaching the separated soil with lysine phosphate ionic liquid aqueous solution (prepared in example 1) according to the leaching step for 2 times, finally leaching the separated soil with deionized water, naturally drying the repeatedly leached soil, and measuring the arsenic content in the soil.
The results are shown in fig. 2, and it can be seen that the arsenic removal rate in the three soils tends to increase and then to stabilize with the increase of the liquid-soil ratio. When the liquid-soil ratio of the lysine phosphate ionic liquid is from 2: 1 to 4:1, the removal rate of arsenic in the three soils is increased from 79.86%, 82.04% and 81.84% to 92.41%, 90.65% and 95.69%, respectively. The liquid-soil ratio of the lysine phosphate ionic liquid is increased from 4:1 to 6:1. The removal rate of arsenic is basically unchanged. The liquid-soil ratio is low, so that the eluting agent cannot be fully contacted with arsenic in soil, the eluting effect is poor, soil particles are further dispersed along with the increase of the liquid-soil ratio, the contact probability of the eluting agent and the arsenic is increased, more arsenic is eluted, however, when the liquid-soil ratio exceeds the optimal liquid-soil ratio, the arsenic cannot be further eluted, and in consideration of economic benefits, the optimal liquid-soil ratio is finally selected to be 4:1. At this time, the arsenic removal rates of the low-concentration, medium-concentration and high-concentration soils were 92.41%, 90.65% and 95.69%, respectively.
Example 4
Referring to example 1, ionic liquid is prepared, the molar ratio of phosphoric acid to lysine is 1: 1-1.
Weighing 5.00g of low-concentration arsenic-polluted soil, respectively adding 20mL of 0.3mol/L of the lysine phosphate ionic liquid aqueous solution with different molar ratios according to the liquid-soil ratio of 4:1, oscillating for 2h, and centrifuging for 10min at 4000r/min to separate solid from liquid, repeatedly leaching the separated soil by using the lysine phosphate ionic liquid aqueous solution with different molar ratios according to the leaching step for 2 times, finally leaching the separated soil by using deionized water, naturally air-drying the repeatedly leached soil, measuring the arsenic content in the soil, and finally calculating the arsenic removal rate shown in table 1.
TABLE 1 comparison table of arsenic removal rates of lysine phosphate ionic liquid aqueous solutions with different molar ratios
| Phosphoric acid to lysine molar ratio | 1:0.5 | 1:1 | 1:2 | 1:3 | 1:3.5 |
| Arsenic removal rate/%) | 70.54 | 92.41 | 64.29 | 52.31 | 37.64 |
Comparative example 1
Referring to example 1, ionic liquids were prepared, lysine was replaced with glycine, cysteine, and proline, and the remaining conditions were not changed to prepare a glycine phosphate ionic liquid aqueous solution, a cysteine phosphate ionic liquid aqueous solution, and a proline phosphate ionic liquid aqueous solution, respectively.
Weighing 5.00g of low-concentration arsenic-polluted soil, respectively adding 20mL of 0.3mol/L of the three ionic liquid aqueous solutions according to the liquid-soil ratio of 4:1, oscillating for 2h, centrifuging for 10min at 4000r/min, separating solid from liquid, repeatedly leaching the separated soil by using the three ionic liquid aqueous solutions according to the leaching step for 2 times, finally leaching the separated soil by using deionized water, naturally drying the repeatedly leached soil by air, measuring the arsenic content in the soil, and finally calculating the arsenic removal rate shown in table 2.
TABLE 2 comparison table of arsenic removal rates of ionic liquid aqueous solutions prepared from different amino acids
| Amino acid ionic liquid | Glycine phosphate ionic liquid | Cysteine phosphate ionic liquid | Proline phosphate ionic liquid |
| Arsenic removal rate/%) | 49.89 | 77.20 | 75.22 |
Comparative example 2
Referring to the method of example 1, lysine ionic liquid was prepared by replacing phosphoric acid with hydrochloric acid, nitric acid, sulfuric acid. And arsenic was removed from the soil by the method of example 1, and the arsenic removal rate is shown in table 3.
TABLE 3 comparison table of arsenic removal rates of ionic liquid aqueous solutions prepared from different acids
Comparative example 3
Weighing 5.00g of arsenic contaminated soil, adding 25ml of 1.2mol/L1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid according to the liquid-soil ratio of 5: 1, oscillating for 24h, centrifuging for 20min at 5000r/min, separating solid from liquid, and measuring the arsenic concentration in the supernatant. The concentration of arsenic in the arsenic-contaminated soil was 84.21mg/kg.
The results show that: the removal rate of the 1-butyl-3-methylimidazole tetrafluoroborate ionic liquid to arsenic is 45.58%.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. The method for repairing the arsenic-polluted soil is characterized in that the arsenic-polluted soil is leached by taking a lysine phosphate ionic liquid aqueous solution as an eluent;
the method comprises the following steps:
(1) Mixing the eluting agent with the arsenic-polluted soil, eluting, and then carrying out solid-liquid separation;
(2) Repeatedly leaching the soil subjected to solid-liquid separation in the step (1) by using a leaching agent according to the step (1);
(3) Leaching the soil subjected to solid-liquid separation in the step (2) with deionized water according to the method in the step (1);
the leaching is to mix the leaching agent with the arsenic-polluted soil and oscillate for 1 to 3 hours;
the repeated leaching is leaching for 1 to 5 times;
the concentration of the phosphoric acid lysine ionic liquid aqueous solution is 0.3-0.5 mol/L;
the volume ratio of the eluting agent to the arsenic-polluted soil is (4-6).
2. The method according to claim 1, wherein the solid-liquid separation is one of standing and centrifugation.
3. The method as claimed in claim 1, wherein the molar ratio of phosphoric acid to lysine in the phospholysine ionic liquid is 1.
4. The method as claimed in claim 1, wherein the preparation method of the lysine phosphate ionic liquid comprises the following steps: dissolving phosphoric acid and lysine in water to prepare a mixed solution, placing the obtained mixed solution in a condensing device for reaction, drying a reaction product, and obtaining the dried product, namely the lysine phosphate ionic liquid.
5. Use of the method according to any one of claims 1 to 4 in the field of soil remediation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111661702.0A CN114345919B (en) | 2021-12-31 | 2021-12-31 | Method for leaching and repairing arsenic-polluted soil by amino acid ionic liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111661702.0A CN114345919B (en) | 2021-12-31 | 2021-12-31 | Method for leaching and repairing arsenic-polluted soil by amino acid ionic liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114345919A CN114345919A (en) | 2022-04-15 |
| CN114345919B true CN114345919B (en) | 2022-10-11 |
Family
ID=81104403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111661702.0A Active CN114345919B (en) | 2021-12-31 | 2021-12-31 | Method for leaching and repairing arsenic-polluted soil by amino acid ionic liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114345919B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020074524A (en) * | 2001-03-20 | 2002-10-04 | 대한민국(여수대학교 총장) | Method of Stabilizing Heavy Metal by Utilizing Amino acid and/or Oligopeptide salt |
| CN100534651C (en) * | 2007-04-29 | 2009-09-02 | 哈尔滨工业大学 | Agent for phytoremediation of soil polluted by heavy metals using the waste active Sludge as the original material and the method of the phytoremediation of soil polluted by heavy metals |
| CN108138261A (en) * | 2015-10-07 | 2018-06-08 | 京瓷株式会社 | Adsorbent and use its compound recovery method |
| CN109877147B (en) * | 2019-04-10 | 2020-10-09 | 江南大学 | Method for restoring cadmium-polluted soil by leaching |
| CN111515236B (en) * | 2020-04-26 | 2022-06-03 | 中国电建集团中南勘测设计研究院有限公司 | In-situ reduction remediation method for cadmium-polluted farmland |
-
2021
- 2021-12-31 CN CN202111661702.0A patent/CN114345919B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114345919A (en) | 2022-04-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Cruz et al. | Kinetic modeling and equilibrium studies during cadmium biosorption by dead Sargassum sp. biomass | |
| CN106040239B (en) | A kind of high-dispersion nano metal simple-substance/carbon composite controllable method for preparing and its electro-catalysis application | |
| CN107511132B (en) | Magnetic ferroferric oxide nano particle and plasma modification method and application thereof | |
| CN104014314B (en) | Bio-adsorbent, preparation method and application | |
| CN111530414A (en) | Spherical-milled biochar-loaded vulcanized nano zero-valent iron composite material and preparation method and application thereof | |
| CN108031433A (en) | A kind of preparation method of mesoporous calcium silicates load nano zero-valence iron composite material | |
| CN110052248A (en) | A kind of humic acid modified charcoal of ferrimanganic and the preparation method and application thereof | |
| CN111422840B (en) | Phosphorus/graphene three-dimensional aerogel material and preparation method and application thereof | |
| CN103357375B (en) | Magnetic mesoporous silica adsorbent for removing organic pollutants in water body and preparation method and application thereof | |
| CN109012565A (en) | A kind of method of the magnetic carbon material Adsorption heavy metal ions in wastewater of nitrating | |
| CN111871374A (en) | Preparation method and application of magnetic biochar | |
| CN109205753A (en) | Modified iron-copper bi-metal nano particle and preparation method thereof | |
| CN107433180A (en) | A kind of sandwich structure nano adsorber of carbon coating magnesia and preparation method thereof | |
| CN114345919B (en) | Method for leaching and repairing arsenic-polluted soil by amino acid ionic liquid | |
| Hosseini et al. | Lead (II) adsorption from aqueous solutions onto modified ag nanoparticles: Modeling and optimization | |
| CN102942234B (en) | Method for treating ammonia nitrogen wastewater | |
| CN102744030A (en) | Graphite oxide-containing nano-material, its preparation method, water treatment agent and its water treatment method | |
| CN106944630A (en) | Stable nano zero valence iron of a kind of marine alga slag and preparation method and application | |
| CN106831514A (en) | The preparation method and heavy metal chelant of heavy metal chelant | |
| CN102423698A (en) | Sewage purification agent | |
| CN110193355A (en) | The method that the porous material of pollution of chromium in water removal is removed in the modified Chinese parasol leaf production of CTAB | |
| CN115779847A (en) | In-situ adsorption material and preparation method and application thereof | |
| CN108085007A (en) | A kind of method for being passivated Cadmium in Soil lead active component rapidly using glycine | |
| CN114713189A (en) | Preparation method of yellow rice wine sludge biochar | |
| CN109133254B (en) | Method for removing phthalic acid in wastewater by modified calcite |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |