CN112062259B - Method for degrading organic pollutants by using interface-targeted activated persulfate - Google Patents
Method for degrading organic pollutants by using interface-targeted activated persulfate Download PDFInfo
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- CN112062259B CN112062259B CN202011010868.1A CN202011010868A CN112062259B CN 112062259 B CN112062259 B CN 112062259B CN 202011010868 A CN202011010868 A CN 202011010868A CN 112062259 B CN112062259 B CN 112062259B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
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Abstract
A method for degrading organic pollutants by using interface targeted activated persulfate comprises the following steps: injecting the suspension of micron zero-valent iron on the amphoteric surface and persulfate into a groundwater aquifer in situ to remove organic pollutants in groundwater; the amphoteric surface micron zero-valent iron is obtained by the following method: A) soaking micrometer zero-valent iron in water, and separating; B) mixing and ball-milling sodium salt, surfactant and soaked micron zero-valent iron, and modifying the surfactant to the surface of the zero-valent iron through the promoting effect of the sodium salt. According to the invention, a persulfate-philic hydrophilic end and an organic-philic hydrophobic end are respectively formed on the surface of zero-valent iron to form amphoteric surface zero-valent iron, the amphoteric surface micron-sized zero-valent iron is injected into pollution feather in situ to degrade typical organic pollutants in groundwater, the degradation efficiency reaches over 95%, and the migration capacity of the material in an aquifer is improved by 3 times compared with that of unmodified zero-valent iron. The invention has the advantages of economy, high efficiency and environmental protection.
Description
Technical Field
The invention belongs to the field of preparation and application of underground water repairing materials, and particularly relates to a method for degrading organic pollutants by using interface targeted activated persulfate.
Background
The rapid development of the petrochemical industry causes serious organic pollution of underground water, and the long-term exposure of the underground water to organic pollution water can affect human health. Therefore, the treatment of organic pollution of underground water is urgent.
The mainstream technology for repairing underground water organic pollution is an advanced oxidation technology. The persulfate oxidation technology has the advantages of safety and high efficiency and is widely concerned. However, the overall application of the technology to in-situ remediation of groundwater also has the problem of difficult activation. In order to improve the persulfate activation efficiency, researchers propose that the traditional homogeneous phase activation technology is changed into a heterogeneous phase activation technology, and the slow release effect of a heterogeneous phase activator is coupled with persulfate activation to repair organic pollutants in underground water. Of which zero-valent iron is considered to be one of the most potent activators. The zero-valent iron is mainly divided into nano zero-valent iron and micron zero-valent iron according to the particle size, wherein the activation effect of the nano zero-valent iron is far better than that of the micron zero-valent iron. However, the cost of the nanometer zero-valent iron is too expensive, so that the nanometer zero-valent iron is not suitable for actual site repair temporarily, and the problem that the micrometer zero-valent iron is easy to passivate and has low corrosion rate is caused, so that the efficiency of degrading pollutants by activating persulfate is low. Based on the situation, the method has been proposed to add activated carbon to construct an iron-carbon primary battery to strengthen zero-valent iron activated persulfate so as to degrade pollutants, and a better effect is achieved. On this basis, the inventors have recognized that to further increase the efficiency of persulfate activation for contaminant degradation, there is a need to increase the capacity of zero-valent iron to target the activation and target the degradation of contaminants by persulfate.
Disclosure of Invention
The invention aims to provide a method for degrading organic pollutants by using interface-targeted activated persulfate
In order to achieve the purpose, the method for degrading organic pollutants by using the interface targeted activated persulfate provided by the invention comprises the following steps:
injecting the suspension of micron zero-valent iron on the amphoteric surface and persulfate into a groundwater aquifer in situ to remove organic pollutants in groundwater;
wherein, the amphoteric surface micron zero-valent iron is obtained by the following method:
A) soaking micrometer zero-valent iron in water, and separating after soaking;
B) mixing sodium salt, a surfactant and the soaked micron zero-valent iron according to a mass ratio of 0.1:1-10:1-100, placing the mixture into a ball mill for ball milling, and modifying the surfactant to the surface of the zero-valent iron through the promoting effect of the sodium salt to obtain the amphoteric surface micron zero-valent iron.
In the method, the suspension of micron zero-valent iron on the amphoteric surface and persulfate are injected into the pollution plume area.
In the method, the injection amount of the micrometer zero-valent iron on the amphoteric surface is 1-5g/L, and the injection amount of the persulfate is 80-100 mM.
In the method, the time for soaking the micron zero-valent iron is judged according to the pH value of the system, and the soaking is stopped when the pH value of the solution rises by 0.5 unit, so that the surface weak corrosion zero-valent iron is formed.
In the method, the sodium salt is sodium chloride, sodium sulfate and/or sodium nitrate; the surfactant is cationic surfactant, anionic surfactant and/or nonionic surfactant; the zero-valent iron is micron-sized waste scrap iron and/or iron powder.
In the method, the ball milling time is 1-5h, and the ball milling rotating speed is more than 300 r/min.
The invention has the beneficial effects that:
1) according to the repairing technology for degrading organic pollutants by using interface targeted activated persulfate, the hydrophilic end of the modified zero-valent iron adsorbs persulfate, the hydrophobic end adsorbs organic pollutants to form an interface reaction area, the capacity of targeted activated persulfate of the zero-valent iron and targeted oxidative pollutant degradation of the persulfate is improved, the migration capacity of the zero-valent iron is greatly improved, and the cost of repairing pollutants by using the technology is comprehensively reduced.
2) According to the invention, a surfactant is modified on the surface of zero-valent iron through the promotion effect of sodium salt to prepare an amphoteric surface micron zero-valent iron material, and finally, the amphoteric surface micron zero-valent iron is added into an underground water aquifer in an in-situ injection mode and used for removing organic pollutants in underground water, wherein the amphoteric surface micron zero-valent iron can strengthen the adsorption of the organic pollutants and persulfate, the release of pollutants adsorbed by soil in the aquifer is increased, and the pollutant removal efficiency is improved, and compared with unmodified micron zero-valent iron, in a certain polycyclic aromatic hydrocarbon polluted site, the migration capacity of the amphoteric surface micron zero-valent iron is 4.5m, and the migration distance of the unmodified zero-valent iron is 1.5 m.
3) The preparation process of the amphoteric surface micron zero-valent iron is simple, and the ball milling tank does not need to be vacuumized and is not additionally protected by inert gas.
Detailed Description
The technical scheme of the invention is as follows:
1) firstly, soaking micron zero-valent iron particles in tap water, wherein the zero-valent iron is micron-sized waste scrap iron and/or iron powder, separating after soaking, then ball-milling sodium salt, a surfactant and the soaked micron zero-valent iron by using a nebula type high-energy ball mill, and modifying the surfactant to the surface of the zero-valent iron to prepare the amphoteric surface micron zero-valent iron material.
2) And finally, adding the amphoteric surface micron zero-valent iron into a groundwater aquifer in an in-situ injection mode to remove pollutants, wherein the interval between the amphoteric surface micron zero-valent iron injection wells is 4.5 m.
According to the scheme, tap water and micron zero-valent iron are added according to the mass ratio of 0.2-1: 1.
According to the scheme, the mass ratio of the sodium salt, the surfactant and the micron zero-valent iron is 0.1:1-10: 1-100.
According to the scheme, the ball milling time is 1-5h, and the ball milling rotating speed is more than 300 r/min.
According to the scheme, the material after ball milling is directly used for pollutant remediation without other treatment.
According to the scheme, the surfactant comprises a cationic surfactant, an anionic surfactant and a nonionic surfactant.
According to the scheme, the suspension with the addition amount of the micron zero-valent iron on the amphoteric surface being 1-5g/L is injected into the pollution plume area in an in-situ injection mode.
Example 1
Firstly weighing 4g of micron zero-valent iron powder, soaking in 0.8g of water for 35min, separating, adding 0.04g of sodium chloride and 0.4g of cationic surfactant, setting the parameters of a ball mill to be 500 r/min, setting the time to be 1h, collecting a sample of the micron zero-valent iron with the amphoteric surface after ball milling, wherein the sample is used for repairing 1mM of polycyclic aromatic hydrocarbon, the adding amount of the micron zero-valent iron with the amphoteric surface is 1g/L, the concentration of persulfate is 100mM, the interval between injection wells is 4.5m, the concentration of the polycyclic aromatic hydrocarbon in the wells is reduced to 0.03mM after 30min of reaction, and the degradation rate is 97%.
Comparative example 1
The original zero-valent iron was used instead of the amphoteric surface micrometer zero-valent iron in example 1, and the concentration of polycyclic aromatic hydrocarbon in the well was reduced to 0.7mM and the degradation rate was 30% under the same conditions as in example 1.
Example 2
Firstly weighing 6g of micron zero-valent iron powder, soaking in 6g of water for 50min, separating, adding 0.006g of sodium sulfate and 0.06g of anionic surfactant, setting the parameters of a ball mill to be 550 r/min, wherein the time is 3h, collecting a sample of the micron zero-valent iron on the amphoteric surface after ball milling, and using the sample for 1mM polycyclic aromatic hydrocarbon remediation, wherein the adding amount of the micron zero-valent iron on the amphoteric surface is 41g/L, the concentration of persulfate is 100mM, the interval between injection wells is 4.5m, the concentration of polycyclic aromatic hydrocarbon in the wells is reduced to 0.04mM after 30min of reaction, and the degradation rate is 96%.
Comparative example 2
The original zero-valent iron was used instead of the amphoteric surface micrometer zero-valent iron in example 2, and the concentration of polycyclic aromatic hydrocarbon in the well was reduced to 0.7mM and the degradation rate was 30% under the same conditions as in example 2.
Example 3
Firstly weighing 5g of micron zero-valent iron powder, soaking in 2.5g of water for 40min, adding 0.025g of sodium nitrate and 0.25g of nonionic surfactant after separation, setting the parameters of a ball mill to be 300 r/min, setting the time to be 5h, collecting a sample of the micron zero-valent iron on the amphoteric surface after ball milling, wherein the sample is used for repairing 1mM of polycyclic aromatic hydrocarbon, the adding amount of the micron zero-valent iron on the amphoteric surface is 1g/L, the concentration of persulfate is 90mM, the interval between injection wells is 4.5m, the concentration of the polycyclic aromatic hydrocarbon in the wells is reduced to 0.05mM after reaction for 30min, and the degradation rate is 95%.
Comparative example 3
The original zero-valent iron was used instead of the amphoteric surface micrometer zero-valent iron in example 3, and the concentration of polycyclic aromatic hydrocarbon in the well was reduced to 0.7mM and the degradation rate was 30% under the same conditions as in example 3.
Claims (6)
1. A method for degrading organic pollutants by using interface targeted activated persulfate comprises the following steps:
injecting the suspension of micron zero-valent iron on the amphoteric surface and persulfate into a groundwater aquifer in situ to remove organic pollutants in groundwater;
wherein, the amphoteric surface micron zero-valent iron is obtained by the following method:
A) soaking micrometer zero-valent iron in water, and separating after soaking;
B) mixing sodium salt, a surfactant and the soaked micron zero-valent iron according to a mass ratio of 0.1:1-10:1-100, placing the mixture into a ball mill for ball milling, and modifying the surfactant to the surface of the zero-valent iron through the promoting effect of the sodium salt to obtain the amphoteric surface micron zero-valent iron.
2. The method of claim 1, wherein the suspension of amphoteric surface micron zero valent iron and persulfate are injected into the groundwater pollution plume area.
3. The method according to claim 1, wherein the injection amount of the amphoteric surface micrometer zero-valent iron is 1 to 5g/L, and the injection amount of the persulfate is 80 to 100 mM.
4. The method of claim 1, wherein the time for soaking the micron zero-valent iron is determined according to the pH of the system, and the soaking is stopped when the pH value of the solution rises by 0.5 unit, so that the surface weakly-corrosive zero-valent iron is formed.
5. The method of claim 1, wherein the sodium salt is sodium chloride, sodium sulfate and/or sodium nitrate; the surfactant is cationic surfactant, anionic surfactant and/or nonionic surfactant; the zero-valent iron is micron-sized waste scrap iron and/or iron powder.
6. The method of claim 1, wherein the ball milling time is 1-5 hours and the ball milling speed is greater than 300 revolutions per minute.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63303001A (en) * | 1987-06-02 | 1988-12-09 | Dowa Teppun Kogyo Kk | Production of flaky iron powder |
| CN104174855A (en) * | 2014-08-13 | 2014-12-03 | 中国科学院物理研究所 | Method for preparing magnetic nanosheet |
| CN108911101A (en) * | 2018-06-25 | 2018-11-30 | 华中师范大学 | A method of based on the efficient heavy-metal ion removal of ball milling oxalic acid Zero-valent Iron |
| CN110436605A (en) * | 2019-08-06 | 2019-11-12 | 华东理工大学 | The method of chlorohydrocarbon in underground water of the iron plane flower activation sodium peroxydisulfate removal containing surfactant |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103769580B (en) * | 2014-02-19 | 2016-03-30 | 南京林业大学 | A kind of preparation method of modified Nano iron powder |
| CN109821883A (en) * | 2019-03-05 | 2019-05-31 | 同济大学 | Soil chlorohydrocarbon restorative procedure based on modified Zero-valent Iron |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63303001A (en) * | 1987-06-02 | 1988-12-09 | Dowa Teppun Kogyo Kk | Production of flaky iron powder |
| CN104174855A (en) * | 2014-08-13 | 2014-12-03 | 中国科学院物理研究所 | Method for preparing magnetic nanosheet |
| CN108911101A (en) * | 2018-06-25 | 2018-11-30 | 华中师范大学 | A method of based on the efficient heavy-metal ion removal of ball milling oxalic acid Zero-valent Iron |
| CN110436605A (en) * | 2019-08-06 | 2019-11-12 | 华东理工大学 | The method of chlorohydrocarbon in underground water of the iron plane flower activation sodium peroxydisulfate removal containing surfactant |
Non-Patent Citations (1)
| Title |
|---|
| "包覆型纳米零价铁活化过硫酸处理柴油污染土壤";吴非等;《环境科学学报》;20160731;第36卷(第7期);第2589-2595页 * |
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