CN107008231B - Composite particles for remediating heavy metal pollutants and method thereof - Google Patents
Composite particles for remediating heavy metal pollutants and method thereof Download PDFInfo
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- CN107008231B CN107008231B CN201610058131.4A CN201610058131A CN107008231B CN 107008231 B CN107008231 B CN 107008231B CN 201610058131 A CN201610058131 A CN 201610058131A CN 107008231 B CN107008231 B CN 107008231B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/223—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material containing metals, e.g. organo-metallic compounds, coordination complexes
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
Abstract
The invention discloses a composite particle for remedying heavy metal pollutants and a method thereof. The composite particle comprises a nano metal core and a modified surface layer surrounding the nano metal core. The modified surface layer has at least one coordination functional group which can form a metal complex with a heavy metal ion, so that the heavy metal ion is easy to contact with the composite particle. The nano metal core takes iron nano particles as a main component and is used for rapidly and continuously reducing the heavy metal ions, and in addition, the nano metal core contains aluminum nano particles and nickel nano particles and is used for improving the corrosion resistance and the stability of the composite particles.
Description
Technical Field
The present invention relates to a composite particle for remediating heavy metal pollutants and a method thereof, and more particularly, to a composite particle for remediating heavy metal pollutants, which can adsorb and further reduce heavy metal ions, and a method thereof.
Background
With the rapid development of industry, people overuse heavy metals, so that the heavy metals which cannot be loaded by the environment are contained in the seeping water of industrial waste liquid and unknown waste stacking sites. Different raw materials and power are used in various industrial methods, the amount of generated wastewater and the water quality are very complicated, particularly, the wastewater containing heavy metals has the influence on the water body ecology after being discharged into rivers, and further influences agricultural irrigation water and civil water. If people drink water sources containing heavy metals for a long time, cumulative poisoning can be caused. If the waste water penetrates into the surface layer of the soil, the possibility that the waste water enters an underground aquifer through leaching is possible, and the pollution of an underground water source is caused. Among the sources of heavy metal wastewater, electroplating wastewater is a well-known main source, and catalysts used in other industrial production such as fertilizer plants in the production of nitrogen fertilizer contain zinc, copper, cobalt, nickel, chromium, molybdenum and other metal substances, which can pollute the environment if not properly recycled or discarded.
Heavy metals are various, and some of them are called essential elements (essential elements) necessary for the growth and physiological functions of living bodies, such as zinc, iron, copper, manganese, cobalt, and the like. In addition, elements that are not required for biological life are called non-essential elements (e.g., cadmium, lead, and mercury). Heavy metals are characterized by the fact that once they enter the environment they are permanently present in the environment and are not naturally decomposed. In addition, heavy metals present in the environment can enter the human body through various routes, for example, heavy metals in the atmosphere can directly enter the human body through the respiratory tract, or can indirectly pollute food and then enter the human body through diet. If the heavy metal is excessive, the organism will produce toxic reaction and even die.
Taking chromium as an example, the chromium is a common heavy metal pollutant in underground water, and chromium is often used in civil industrial processes such as paint, alloy, electroplating, photography, alkali chloride, petrifaction, paper making, textile, leather and the like, so that leakage can be caused when the process control is cared away or the waste treatment is improper, and serious influence and impact are caused on the health and ecological environment of people in the area adjacent to the leakage range through various exposure ways such as drinking water and the like. The main existence forms of chromium in the water environment comprise trivalent chromium and hexavalent chromium, wherein the trivalent chromium has stable chemical properties, has weak infiltration capacity on biological cell membranes and is easy to fix in tissues; hexavalent chromium has a strong oxidizing ability, and thus has a great toxic effect on living bodies, and hexavalent chromium species are often classified as a regulatory item in related regulations of safety, sanitation and environmental protection.
Although many researches on remediation of heavy metal polluted groundwater or soil are carried out at present, the green remediation technology has the greatest development potential under the rising consciousness of environmental protection. There is still a need for a better solution in maintaining the composition of the environment, such as in-situ soil groundwater, stability of the substrate itself used, control of remediation time duration, diffusion of contaminants, or simplification of remediation procedures.
Therefore, there is a need for a composite particle for remediating heavy metal pollutants and a method thereof to solve the problems of the prior art.
Disclosure of Invention
The present invention provides a composite particle for remedying heavy metal pollutants, which has a multi-layered structure, wherein the inner layer structure is composed of a plurality of metal nanoparticles contained in the earth crust, and iron nanoparticles are used as a main component for reducing heavy metal ions, and the stability of the iron nanoparticles is enhanced and the consumption rate is reduced by using the assistance of other metal nanoparticles, so that the service life of the composite particle can be prolonged.
The secondary objective of the present invention is to provide a composite particle for remediating heavy metal pollutants, wherein the outer layer structure of the composite particle contains functional groups capable of binding with heavy metal ions, so as to improve the contact chance between the heavy metal ions and the composite particle, promote the remediation efficiency, and the heavy metal ions can settle along with the weight of the composite particle, thereby reducing the re-release of the heavy metal ions and limiting the diffusion range thereof. In addition, the outer layer structure also has bioavailable components, which can promote in-situ microbial growth and enhance and engage in bioremediation processes for other contaminants.
It is still another object of the present invention to provide a method for remediating heavy metal pollutants, which can simplify the remediation process by mixing or contacting the composite particles with the heavy metal pollutants, and which does not change the composition of in-situ soil groundwater during and after remediation, thus being very environmentally friendly.
To achieve the above objects, one embodiment of the present invention provides a composite particle for remediating heavy metal pollutants, comprising a nano metal core comprising iron nanoparticles, aluminum nanoparticles and nickel nanoparticles; and a modified surface layer surrounding the nano metal core, wherein the modified surface layer has at least one coordination functional group for forming a metal complex with a heavy metal ion, so that the heavy metal ion is adsorbed on the modified surface layer.
In an embodiment of the invention, in the nano metal core, the weight of the nickel nanoparticles is smaller than that of the aluminum nanoparticles, and the weight of the aluminum nanoparticles is smaller than that of the iron nanoparticles.
In one embodiment of the invention, the iron nanoparticles comprise at least 65% by weight of the nanometal core.
In one embodiment of the invention, the aluminum nanoparticles comprise up to 25% by weight of the nanometal core.
In one embodiment of the invention, the nickel nanoparticles comprise up to 10% by weight of the nanometal core.
In an embodiment of the present invention, the coordinating functional group is a hydroxyl group (-OH), an ether group (-O-), an aldehyde group (-CHO), a ketone group (-CO-), a carboxyl group (-COOH), an ester group (-COO-), an amine group (-NH-)2) Or amide group (-CO-NH)2)。
In one embodiment of the present invention, the heavy metal ions are hexavalent chromium ions.
In one embodiment of the present invention, the modified surface layer comprises citric acid, amino acids, synthetic vitamins, a biodegradable surfactant and an organic solvent.
In one embodiment of the present invention, the weight ratio of the citric acid, the amino acid, the synthetic vitamin, the biodegradable surfactant and the solvent is 10: 5: 5: 30: 50.
in one embodiment of the present invention, the biodegradable surfactant comprises lecithin, and the lecithin is at least 15 to 30% by weight of the modified surface layer.
Furthermore, another embodiment of the present invention provides a method for remediating heavy metal pollutants, comprising the following steps: (1) providing a composite particle for remediating heavy metal contaminants as described above; and (2) contacting the composite particles with a heavy metal contaminant.
In an embodiment of the present invention, the heavy metal pollutant is soil containing heavy metals or water containing heavy metals.
In an embodiment of the present invention, the heavy metal contaminant includes hexavalent chromium ions as the heavy metal ions.
In an embodiment of the present invention, the modified surface layer reacts with water to form an emulsified colloid layer.
In order to make the aforementioned and other aspects of the invention more comprehensible, preferred embodiments are described in detail below:
drawings
FIG. 1: the structure of the composite particle according to an embodiment of the present invention is schematically illustrated.
FIG. 2: a bar graph of the ratio of the iron/aluminum/nickel metal components in the composite particles of an embodiment of the present invention.
FIG. 3: showing the total reduction efficiency of the composite particles of an embodiment of the present invention to hexavalent chromium ions in the case of continuously injecting the hexavalent chromium ions.
FIG. 4: after the hexavalent chromium ions are reduced by the composite particles according to an embodiment of the present invention, the spectrogram is analyzed by an X-ray photoelectron spectrometer (XPS).
FIG. 5: the composite particle of an embodiment of the present invention is a mechanism for remedying hexavalent chromium ions.
Detailed Description
Directional phrases used herein, such as, for example, upper, lower, top, bottom, front, rear, left, right, inner, outer, lateral, peripheral, central, horizontal, transverse, vertical, longitudinal, axial, radial, uppermost or lowermost, etc., refer only to the orientation of the attached drawings. In addition, as used herein, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. For example, the term "a compound" or "at least one compound" may include a plurality of compounds, including mixtures thereof; as used herein, the term "%" refers to "% by weight (wt%)", unless otherwise specified; numerical ranges (e.g., 10% to 11% A) include upper and lower limits (i.e., 10% to 11%) unless otherwise specified; numerical ranges without a lower limit (e.g., less than 0.2% B, or less than 0.2% B) are all meant that the lower limit may be 0 (i.e., 0% to 0.2%); the ratio of the "weight percentage" of each component may be replaced by the ratio of the "weight part". The words used above are words of description and understanding, rather than words of limitation.
Referring to fig. 1, an embodiment of the present invention provides a composite particle 10 for remediating heavy metal pollutants, which mainly comprises a nano metal core 11 and a modified surface layer 12. The composite particle 10 has a particle size of about 80 to 100 nm.
The nanometal core 11 may be composed of a variety of metal nanoparticles, including iron nanoparticles, aluminum nanoparticles, and nickel nanoparticles. In the nano metal core 11, the weight of the nickel nanoparticles is smaller than that of the aluminum nanoparticles, and the weight of the aluminum nanoparticles is smaller than that of the iron nanoparticles. The iron nanoparticles comprise at least 65% by weight of the nanometal core 11. The aluminum nanoparticles constitute up to 25% by weight of the nanometal core 11. The nickel nanoparticles comprise up to 10% by weight of the nanometal core 11. Preferably, the iron nanoparticles are present in an amount of 65 to 80 wt% (i.e., 65% or more and less than 100% Fe), the aluminum nanoparticles are present in an amount of 15 to 25 wt% (i.e., 15% or more and less than 25% Al), and the nickel nanoparticles are present in an amount of 5 to 10 wt% (i.e., 5% or more and less than 10% Ni), based on the weight of the nanometal core 11, and the sum of the iron, aluminum, and nickel nanoparticles is 100 wt%.
Further, the modified surface layer 12 is formed on the outer layer of the nano metal core 11 and surrounds the nano metal core 11. The modified surface layer 12 comprises at least one coordination functional group capable of forming a metal complex with a heavy metal ion, so that the heavy metal ion is adsorbed on the modified surface layer 12, increasing the contact chance between the heavy metal ion and the composite particle 10, and further being easy to contact with the composite particleThe nano metal core 11 is subjected to a reduction reaction. The coordinating functional group may, for example, be selected from the group consisting of a hydroxyl group (-OH), an ether group (-O-), an aldehyde group (-CHO), a ketone group (-CO-), a carboxyl group (-COOH), an ester group (-COO-), an amine group (-NH-)2) And amide (-CO-NH)2) The group consisting of. The heavy metal ion may be, for example, a hexavalent chromium ion (Cr)6 +) However, it is not limited thereto.
Furthermore, the modified surface layer 12 contains components for the growth of microorganisms, such as citric acid, amino acids, synthetic vitamins, biodegradable surfactants, and an organic solvent. Preferably, the weight ratio of the citric acid, the amino acid, the synthetic vitamin, the biodegradable surfactant and the solvent may be 10: 5: 5: 30: 50, but is not limited thereto. The complex vitamins include, for example, at least one of vitamin B group, vitamins A, C, D, E and K, or any combination thereof, and promote microbial growth. The biodegradable surfactant can improve the oil-water intersolubility, can be naturally decomposed in the environment, does not leave harmful substances in the environment, and meets the requirement of environmental protection. The biodegradable surfactant may be, for example, lecithin, natural vegetable oil derivatives (e.g., coconut oil, palm oil derivatives), or natural sapindoside, but is not limited thereto. Preferably, the biodegradable surfactant comprises lecithin, and the lecithin is at least 15 to 30% by weight of the modified surface layer, and may be, for example, 15, 16, 17, 18, or 20%, but is not limited thereto. The organic solvent is preferably selected from water-soluble solvents, such as ethanol.
Another embodiment of the present invention provides a method for remediating heavy metal contaminants comprising the steps of: (1) providing a composite particle 10 for remediating heavy metal contaminants as described above; and (2) contacting the composite particle 10 with a heavy metal contaminant.
The method for remedying the heavy metal pollutants in one embodiment of the invention comprises the following steps: (1) composite particles 10 for remediating heavy metal contaminants as described above are provided. In this step, the nano-metal core 11 may be synthesized, for example, by wet deposition, and then immersed in a mixture of 50% ethanol, 15% lecithin, 10% citric acid, 5% synthetic amino acid, 5% synthetic vitamin, and 15% natural derived surfactant (e.g., coconut oil, palm oil derivative), and sufficiently shaken to form a suspension. And freeze-drying to remove excessive water to obtain product powder, analyzing the surface microscopic state with scanning electron microscope and energy dispersive spectrometer (SEM-EDS), dissolving the material into solution, and analyzing the metal components with inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The results of analyzing the metal components of iron/aluminum/nickel of 4 groups of composite particles with different weights are shown in table 1 in fig. 2.
TABLE 1
| Group of | 1 | 2 | 3 | 4 | 5 |
| Sample weight (g) | 0.0364 | 0.0640 | 0.1195 | Average weight | Theoretical value |
Theoretical values for group 5 are the weight percentages of iron/aluminum/nickel in the in situ crust set as iron: aluminum: nickel 76.6: 13.4: after ICP-AES analysis of the other four groups, as shown in FIG. 2, the average of the actual compositions of Fe/Al/Ni metals was found to be about Fe: aluminum: nickel 70: 20.8: 9.2, it was confirmed that the composition of the prepared composite particles was actually Fe/Al/Ni and the ratio of the actual value to the theoretical value was similar, and it was also confirmed that the composite particles of the present invention could actually adjust the ratio of metals contained in the nano-metal core according to the composition of the shell.
The method of an embodiment of the invention is followed by: (2) the composite particle 10 is contacted with a heavy metal contaminant. In this step, for example, water is used as a carrier, the composite particles 10 and water are firstly formed into a suspension, and then the suspension is injected or mixed into the heavy metal pollutants; alternatively, the heavy metal contaminant, water, and the composite particle 10 may be directly mixed; or, the composite particles can be filled in a proper container to be used as a filter material for the heavy metal pollutants to pass through. The above method can be adjusted according to the type of the heavy metal pollutants, the remediation range or the requirement of combining with other types of remediation, and is not particularly limited. The heavy metal pollutants can be soil containing heavy metals or water containing heavy metals. The heavy metal contaminant includes at least one heavy metal ion, such as hexavalent chromium (Cr)6+) However, the present invention is not limited thereto, and the composite particle 10 of the present invention may be used to remediate heavy metal ions that can form a metal complex with the above coordinating functional group and that can be reduced by the nano metal core 11. The modified surface layer 12 of the composite particle 10 can react with water to form an emulsified colloid layer, which is a porous structure, so that the heavy metal ions can pass through to reach the nano metal core 11. Further, the modified surface layer 12 contains the biodegradable surfactant, and therefore, is very advantageous for dispersion in water (groundwater, wastewater, etc.).
To verify the success of the method for remediating heavy metal pollutants of the present invention, laboratory simulation tests were performed and the results thereof are as follows.
Experiment one: treatment of hexavalent chromium pollutants in water
The composite particles 10 (containing about 56.0mg of iron) were poured into a sample of water containing hexavalent chromium, and a potassium dichromate solution was refilled at intervals to provide hexavalent chromium ions (Cr)6+) So as to simulate the continuous injection state of hexavalent chromium pollutants in the local environment and evaluate the continuous decontamination capability of the composite particles 10 after being injected into the water body. The number of refills and the time are shown in table 2 below.
TABLE 2
| Number of |
0 | 1 | 2 | 3 | 4 | 5 | 6 |
| Time (hours) | 0 | 6 | 24 | 48 | 72 | 96 | 144 |
After the composite particles are injected into a hexavalent chromium water sample at the beginning (0 hour), the analysis result shows that Cr in the solution is obtained6+The concentration tends to be 0mg/L (mg/L), indicating that Cr is present in the solution6+Is reduced to Cr immediately upon introduction of the composite particles3+. After 6 hours, the same solution was subjected to Cr 16+Make up of Cr in the solution6+The estimated concentration is 100mg/L, and hexavalent chromium is analyzed again to find the result Cr6+The concentration also tends to 0mg/L, showing that the composite particles can still rapidly reduce Cr if hexavalent chromium is re-injected6+. The 5 th (96 hours) of Cr refilling is carried out6+While, Cr is measured6+The concentration is about 50mg/L, and then the 6 th additional Cr injection is carried out at 144 hours (sixth day) of the experiment6+And measuring that the residual concentration of the hexavalent chromium in the water sample is about 57 mg/L. The experiment is continued for 216 hours (ninth day), and Cr in the water sample can be measured6+The concentration tends to 0mg/L, indicating that the composite particles are capable of continuing to reduce hexavalent chromium for a sufficient reaction time. The total amount of hexavalent chromium that the composite particles are capable of continuously and rapidly removing is about 49.0mg (calculated only up to the fifth refill), and the calculated weight of continuously removing hexavalent chromium per gram of the composite particles is about 0.875 grams. Figure 3 shows the total reduction efficiency of the composite particles to hexavalent chromium during the test. Six times contamination of Cr is confirmed6+Under continuous injection, the reduction efficiency of the composite particles is still as high as 100%, which shows that the composite particles can rapidly reduce pollutants and can also continuously reduce the newly added pollutants.
Experiment two: after hexavalent chromium pollutants are treated, the state of surface precipitates is observed
As shown in fig. 4, the results of X-ray photoelectron spectroscopy (XPS) can confirm that the composite particles can effectively adsorb chromium ions in water and reduce hexavalent chromium to trivalent chromium. After the reaction, hydroxide radicals and oxygen functional groups on the surface of the composite particles are increased, and no hexavalent chromium absorption peak can be obtained from the bonds of the composite particles, and only the absorption peak is consistent with Cr2O3Or Cr (OH)3And the bond energy of trivalent chromium (9.8 eV). The analysis result proves that the hexavalent chromium pollutant in the water phase is reduced into trivalent chromium to form solid which is adsorbed on the complex chromiumThe hexavalent chromium in the aqueous phase is removed by combining the particle surfaces, and the results of the elemental morphology analysis also confirm that the hexavalent chromium in the water is effectively reduced to trivalent chromium, chromium hydroxide (Cr (OH)3) The formation and adsorption mechanism of (a) is shown in FIG. 5.
Referring to fig. 5, the remediation mechanism of the composite particles 10 for the hexavalent chromium ions is shown in fig. 4. First, the aluminum nanoparticles contained in the nano-metal core 11 may coat and protect the nano-metal core 11, slow down the corrosion rate, and provide electrons to the iron nanoparticles. The nickel nanoparticles are inert metal terminals, which are not easily oxidized and can form a direct current battery structure with the iron nanoparticles, so that electrons are continuously and stably released to the surface of the nano metal core 11. The coordinating functional group of the modified surface layer 12 can hold hexavalent chromium ions, hexavalent chromium ions (Cr)6+) Reduced by the iron nanoparticles to trivalent chromium ions (Cr) through the modified surface layer 123+) Followed by formation of chromium hydroxide (Cr (OH)3) Solid to deposit on the nano-metal core 11 while the iron nanoparticles are oxidized into ferrous ions (Fe)2+) And continuously reducing hexavalent chromium ions. The in-situ microorganisms 20 can promote their growth by using the biodegradable surfactant, vitamins, minerals, and the like contained in the modified surface layer 12. The main component of the completely oxidized nano metal core 11 is similar to the crust, so that the in-situ biological acceptability is high and the impact on the environment is extremely low.
Compared with the prior art, the composite particle for remedying the heavy metal pollutants and the method thereof provided by the invention can rapidly and continuously reduce the heavy metal pollutants by combining the green physical and chemical remediation technology with the biological rehabilitation method, and improve the activity and the quantity of the microorganisms in situ so as to degrade other pollutants. The composite particles of the present invention have the following advantages: (1) the crustal elements which do not change the environment composition of soil, underground water and the like after being added are a land improvement technology; (2) the nanotechnology is combined with the surface modification technology, so that the corrosion speed of the zero-valent iron can be slowed down due to the existence of aluminum and nickel, and the effective time, stability and transmissibility of the material are improved; (3) the nano-scale and microporous properties can improve the specific surface area of the material and accelerate the anaerobic reduction reaction of heavy metal ions in the unsaturated layer and the saturated layer; (4) providing a substrate available to microorganisms, enhancing in situ biodegradability; (5) an anaerobic environment can be quickly created, the reduction reaction of pollutants is promoted, electrons are continuously released in the later period of the reaction, and the degradation of residual target pollutants is enhanced; (6) avoiding soil acidification and damage.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It must be noted that the disclosed embodiments do not limit the scope of the invention. Rather, modifications and equivalent arrangements included within the spirit and scope of the claims are included within the scope of the invention.
Claims (9)
1. A composite particle for remediating heavy metal pollutants, comprising: the composite particle comprises: a nano-metal core comprising iron nanoparticles, aluminum nanoparticles, and nickel nanoparticles; and
a modified surface layer surrounding the nano metal core, the modified surface layer having at least one coordination functional group for forming a metal complex with a heavy metal ion to make the heavy metal ion adsorbed on the modified surface layer,
wherein in the nano-metal core, the iron nanoparticles comprise at least 65% by weight of the nano-metal core; the aluminum nanoparticles comprise up to 25% by weight of the nanometal core; the nickel nanoparticles comprise up to 10% by weight of the nanometal core; the weight of the nickel nano particles is less than that of the aluminum nano particles, and the weight of the aluminum nano particles is less than that of the iron nano particles; and the modified surface layer comprises citric acid, amino acid, comprehensive vitamin, a biodegradable surfactant and an organic solvent.
2. The composite particle of claim 1, wherein: the heavy metal ions are hexavalent chromium ions.
3. The composite particle of claim 1, wherein: the coordination functional group is a hydroxyl group, an ether group, an aldehyde group, a ketone group, a carboxyl group, an ester group, an amine group or an amide group.
4. The composite particle of claim 1, wherein: the weight ratio of the citric acid, the amino acid, the comprehensive vitamin, the biodegradable surfactant and the solvent is 10: 5: 5: 30: 50.
5. the composite particle of claim 1, wherein: the biodegradable surfactant comprises lecithin, and the lecithin is 15 to 30% by weight of the modified surface layer.
6. A method for remediating heavy metal pollutants, comprising: the method comprises the following steps:
(1) providing the composite particle for remediating heavy metal pollutants of claim 1; and
(2) contacting the composite particles with a heavy metal contaminant.
7. The method for remediating heavy metal pollutants as recited in claim 6, wherein: the heavy metal pollutants are soil containing heavy metals or water containing heavy metals.
8. The method for remediating heavy metal pollutants as recited in claim 6, wherein: the heavy metal ions contained in the heavy metal pollutants are hexavalent chromium ions.
9. The method for remediating heavy metal pollutants as recited in claim 6, wherein: the modified surface layer reacts with water to form an emulsified colloid layer.
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| CN101500950A (en) * | 2006-08-09 | 2009-08-05 | 栗田工业株式会社 | Method and apparatus for biological treatment of organic of organic wastewater |
| CN102951749A (en) * | 2012-11-12 | 2013-03-06 | 同济大学 | Method and device for removing heavy metals in industrial wastewater by nanoscale zero-valent iron-multilevel reversed filter type system |
| TWI401215B (en) * | 2009-11-20 | 2013-07-11 | Nat Univ Kaohsiung | Separation and recovery of metal ions |
| CN103298747A (en) * | 2010-11-15 | 2013-09-11 | 阿彻丹尼尔斯米德兰德公司 | Compositions and uses thereof in converting contaminants |
| CN105081305A (en) * | 2014-05-04 | 2015-11-25 | 中国人民解放军63971部队 | Porous nanometer zero-valent iron and porous nanometer zero-valent iron composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101500950A (en) * | 2006-08-09 | 2009-08-05 | 栗田工业株式会社 | Method and apparatus for biological treatment of organic of organic wastewater |
| TWI401215B (en) * | 2009-11-20 | 2013-07-11 | Nat Univ Kaohsiung | Separation and recovery of metal ions |
| CN103298747A (en) * | 2010-11-15 | 2013-09-11 | 阿彻丹尼尔斯米德兰德公司 | Compositions and uses thereof in converting contaminants |
| CN102951749A (en) * | 2012-11-12 | 2013-03-06 | 同济大学 | Method and device for removing heavy metals in industrial wastewater by nanoscale zero-valent iron-multilevel reversed filter type system |
| CN105081305A (en) * | 2014-05-04 | 2015-11-25 | 中国人民解放军63971部队 | Porous nanometer zero-valent iron and porous nanometer zero-valent iron composite material |
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