CN109174040B - Preparation method of polyfunctional group metal adsorbent - Google Patents
Preparation method of polyfunctional group metal adsorbent Download PDFInfo
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- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 description 1
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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
- B01J20/26—Synthetic macromolecular compounds
- B01J20/265—Synthetic macromolecular compounds modified or post-treated polymers
- B01J20/267—Cross-linked polymers
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
-
- 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
-
- 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
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- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a preparation method of a multifunctional group metal adsorbent. Firstly, preparing a buffer solution with pH of 4.5; adding gallic acid into buffer solution, stirring and dissolving; adding laccase into the solution, stirring and dissolving, then adding polyethyleneimine, heating, and stirring to react to obtain a reaction solution; dropwise adding an alkali solution into the reaction solution to adjust the pH value to 7-9, heating, stirring, reacting, cooling to normal temperature to obtain solid powder, carrying out suction filtration and washing on the solid powder to obtain a filter cake, and drying the filter cake to obtain the polyfunctional group metal adsorbent. The method obtains the polygallic acid-polyethyleneimine composite adsorbent by crosslinking the gallic acid and the polyethyleneimine, and has better adsorption effect on heavy metal ions.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a preparation method of an adsorbent for heavy metal ions in sewage
Background
Heavy metal ions, as a traditional water pollutant, have high toxicity and are difficult to degrade, and become a great hazard to the water pollutant, and the problem of heavy metal pollution is increasingly prominent along with the development of the industry. The adsorption method has the advantages of cheap materials, convenient operation, good heavy metal treatment and the like, and is widely concerned by researchers.
In recent years, polyethyleneimine has attracted considerable attention as an adsorbent. The polyethyleneimine molecule contains a large amount of primary, secondary and tertiary amine groups, has high adsorption capacity and adsorption selectivity on metal ions, has good reaction activity on amino groups, is easy to functionalize and modify, and has a wide application range. In addition, the polyethyleneimine has biocompatibility and is a novel environment-friendly adsorbent. As the adsorbent, because polyethyleneimine molecules can be dissolved in an aqueous phase, the adsorbent has the defects of difficult operation, difficult separation and recovery, easy loss and the like, and the application of the polyethyleneimine as an adsorbent material in the environment is restricted. The method for solving the problem is to compound polyethyleneimine on a substrate material or to modify the substrate material through grafting or crosslinking so as to form a shape and a material which are more suitable for treating environmental pollution. Patent CN106732431A discloses a method for preparing a metal ion adsorbent by using sodium alginate and polyethyleneimine through copper chloride crosslinking and then eluting copper ions, wherein although a good effect of removing a part of metal ions is achieved, the adsorbent is extremely unstable because there is no real chemical bond between sodium alginate and polyethyleneimine. In patent CN106861658A, polyethyleneimine and cross-linking agent (cyanuric chloride, biphenyl dibenzyl chloride, p-phenyl dichloro benzyl, etc.) are directly cross-linked to prepare adsorbent, which is not only difficult to operate but also needs to use toxic organic solvent such as tetrahydrofuran, etc., thus greatly increasing the harm to environment and human body. Patent CN105413661A uses chitosan and polyethyleneimine to form the adsorbent through glutaraldehyde crosslinking, multiple crosslinking substances are produced in the reaction process, and a single chitosan-polyethyleneimine product is not easy to control, so that the preparation of the adsorbent is unstable.
In modern technologies, much research has been conducted on the single use of polyethyleneimine and tannic acid as a research for treating metal-containing sewage, but the adsorption of heavy metal ions by a multi-functional group composite adsorbent prepared by crosslinking polygallic acid and polyethyleneimine has not been reported.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of a multifunctional group metal adsorbent by using gallic acid and polyethyleneimine as raw materials. The invention takes naturally enriched gallic acid as a raw material, the gallic acid is synthesized into the poly-gallic acid by laccase catalysis self-polymerization, the poly-gallic acid molecules contain a large amount of phenolic hydroxyl and carboxyl, and can also be used as a heavy metal ion adsorbent, but also are water-soluble molecules, and the poly-gallic acid and polyethyleneimine are crosslinked to form a water-insoluble heavy metal ion adsorbent with multiple functional groups, thereby overcoming the defects of difficult operation, difficult separation and recovery, easy loss and the like of the polyethyleneimine as the heavy metal ion adsorbent.
The technical scheme adopted by the invention comprises the following steps:
a) preparing a buffer solution with the pH value of 4.5;
b) adding gallic acid into buffer solution, stirring and dissolving;
c) adding laccase into the solution obtained in the step b), stirring and dissolving, then adding polyethyleneimine (with the molecular weight Wn being 1800), heating to 40-60 ℃, and stirring and reacting for 20-28 h to obtain a reaction solution;
d) dropwise adding an alkali solution into the reaction liquid to adjust the pH value to 7-9, heating to 60-80 ℃, stirring for reaction for 12-36 hours, cooling to normal temperature to obtain solid powder, carrying out suction filtration and washing on the solid powder to obtain a filter cake, and drying the filter cake to obtain the polyfunctional group metal adsorbent.
The buffer solution in the step a) is 2mol/L acetic acid/sodium acetate buffer solution.
The concentration of the gallic acid in the step b) is 1.0-4.0 g/L.
The mass ratio of the gallic acid in the step b) to the polyethyleneimine in the step c) is 4: 1-1: 4.
The alkali solution in the step d) is sodium hydroxide solution or potassium hydroxide solution.
The method obtains the polygallic acid-polyethyleneimine composite adsorbent by crosslinking the gallic acid and the polyethyleneimine, and has better adsorption effect on heavy metal ions.
The invention has the following beneficial effects:
1) gallic acid is polymerized under the catalysis of laccase to generate poly gallic acid which is soluble in water and has a certain heavy metal ion adsorption function, and the poly gallic acid is crosslinked with polyethyleneimine to form a water-insoluble heavy metal ion adsorbent with multiple functional groups, so that the defects of difficult operation, difficult separation and recovery, easy loss and the like of the polyethyleneimine as the heavy metal ion adsorbent are overcome.
2) The heavy metal ion adsorbent formed by combining the polygallic acid and the polyethyleneimine through chemical bonds has functional groups such as amino, hydroxyl, carboxyl and the like.
3) The poly-gallic acid and the polyethyleneimine are combined through chemical bonds to form cocoon-shaped powder with a three-dimensional net structure, so that adsorption sites are greatly improved.
Drawings
FIG. 1 is an XPS diagram of a multifunctional metal adsorbent according to the present invention, wherein:
panel (a) is a spectrum of N1 s;
panel (b) is the spectrum C1 s;
FIG. 2 is an SEM image of the multifunctional metal adsorbent of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
The examples of the invention are as follows:
example 1:
a) 2mol/L of acetic acid/sodium acetate buffer solution with pH value of 4.5 is prepared.
b) Adding 1.0g gallic acid into the above 1L buffer solution, stirring and dissolving to obtain 1.0g/L gallic acid solution.
c) Adding laccase into the solution obtained in the step b), stirring and dissolving, adding polyethyleneimine (Wn is 1800) according to the mass ratio of gallic acid to polyethyleneimine of 1:4, heating to 40 ℃, and stirring and reacting for 20 h.
d) And dropwise adding a sodium hydroxide solution into the reaction liquid to adjust the pH value to 7, heating to 60 ℃, stirring for reacting for 12 hours, cooling to normal temperature to obtain solid powder, carrying out suction filtration and washing on the solid powder to obtain a filter cake, and drying the filter cake to obtain the multifunctional group metal adsorbent X1.
Example 2:
a) 2mol/L of acetic acid/sodium acetate buffer solution with pH value of 4.5 is prepared.
b) 4.0g of gallic acid was added to the above 1L of the buffer solution, and dissolved by stirring to obtain 4.0g/L of gallic acid solution.
c) Adding laccase into the solution obtained in the step b), stirring and dissolving, adding polyethyleneimine (Wn is 1800) according to the mass ratio of gallic acid to polyethyleneimine of 4:1, heating to 60 ℃, and stirring and reacting for 28 h.
d) And (3) dropwise adding a potassium hydroxide solution into the reaction liquid to adjust the pH value to 9, heating to 80 ℃, stirring for reacting for 36 hours, cooling to normal temperature to obtain solid powder, carrying out suction filtration and washing on the solid powder to obtain a filter cake, and drying the filter cake to obtain the multifunctional group metal adsorbent X2.
Example 3:
a) 2mol/L of acetic acid/sodium acetate buffer solution with pH value of 4.5 is prepared.
b) Adding 3.0g gallic acid into the above 1L buffer solution, stirring and dissolving to obtain 3.0g/L gallic acid solution.
c) Adding laccase into the solution obtained in the step b), stirring and dissolving, adding polyethyleneimine (Wn is 1800) according to the mass ratio of gallic acid to polyethyleneimine of 1:1, heating to 50 ℃, and stirring and reacting for 24 hours.
d) And dropwise adding a sodium hydroxide solution into the reaction liquid to adjust the pH value to 8, heating to 70 ℃, stirring for reacting for 24 hours, cooling to normal temperature to obtain solid powder, carrying out suction filtration and washing on the solid powder to obtain a filter cake, and drying the filter cake to obtain the multifunctional group metal adsorbent X3.
Example 4:
a) 2mol/L of acetic acid/sodium acetate buffer solution with pH value of 4.5 is prepared.
b) Adding 2.0g gallic acid into the above 1L buffer solution, stirring and dissolving to obtain 2.0g/L gallic acid solution.
c) Adding laccase into the solution obtained in the step b), stirring and dissolving, adding polyethyleneimine (Wn is 1800) according to the mass ratio of gallic acid to polyethyleneimine of 2:3, heating to 50 ℃, and stirring and reacting for 24 hours.
d) And dropwise adding a sodium hydroxide solution into the reaction liquid to adjust the pH value to 8, heating to 70 ℃, stirring for reacting for 24 hours, cooling to normal temperature to obtain solid powder, carrying out suction filtration and washing on the solid powder to obtain a filter cake, and drying the filter cake to obtain the multifunctional group metal adsorbent X4.
Example 5:
a) 2mol/L of acetic acid/sodium acetate buffer solution with pH value of 4.5 is prepared.
b) Adding 2.0g gallic acid into the above 1L buffer solution, stirring and dissolving to obtain 2.0g/L gallic acid solution.
c) Adding laccase into the solution obtained in the step b), stirring and dissolving, adding polyethyleneimine (Wn is 1800) according to the mass ratio of gallic acid to polyethyleneimine of 1:2, heating to 60 ℃, and stirring and reacting for 28 h.
d) And (3) dropwise adding a potassium hydroxide solution into the reaction liquid to adjust the pH value to 8, heating to 60 ℃, stirring to react for 12 hours, cooling to normal temperature to obtain solid powder, carrying out suction filtration and washing on the solid powder to obtain a filter cake, and drying the filter cake to obtain the multifunctional group metal adsorbent X5.
Test example
Zn with the concentration of 200mg/L at 150mL2+,Cu2+,Fe3+,Pb2+,Cd2+And Cr3+The solution of (2) was added with 50mg of the adsorbents prepared in examples 1 to 5, and the adsorption amounts of the adsorbents to heavy metal ions at room temperature (25 ± 2 ℃) were as shown in table 1:
TABLE 1 adsorption capacity of adsorbents for various heavy metals
As can be seen from Table 1, the multi-functional group metal ion adsorbent obtained by the present invention has a good adsorption effect on heavy metal ions.
As can be seen from figure 1, the metal ion adsorbent obtained by the invention contains functional groups with adsorption performance such as amino, hydroxyl, carboxyl and the like, greatly enhances the chelating capacity of the adsorbent and metal ions, and therefore has good adsorption effect.
As can be seen from FIG. 2, the metal ion adsorbent obtained by the invention has a silkworm cocoon-shaped surface, a loose surface structure and a larger specific surface area, and therefore, has a high adsorption capacity.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (6)
1. A preparation method of a multifunctional metal adsorbent is characterized by comprising the following steps:
a) preparing a buffer solution with the pH value of 4.5;
the buffer solution in the step a) is 2mol/L acetic acid/sodium acetate buffer solution;
b) adding gallic acid into buffer solution, stirring and dissolving;
c) adding laccase into the solution obtained in the step b), stirring and dissolving, adding polyethyleneimine, heating and stirring for reaction;
d) and dropwise adding an alkali solution into the reaction solution to regulate the pH value, heating, stirring, reacting, cooling to normal temperature to obtain solid powder, performing suction filtration and washing on the solid powder to obtain a filter cake, and drying the filter cake to obtain the polyfunctional group metal adsorbent.
2. The method for producing a polyfunctional metal adsorbent as claimed in claim 1, wherein: the concentration of the gallic acid obtained in the step b) is 1.0-4.0 g/L.
3. The method for producing a polyfunctional metal adsorbent as claimed in claim 1, wherein: the mass ratio of the gallic acid in the step b) to the polyethyleneimine in the step c) is 4: 1-1: 4.
4. The method for producing a polyfunctional metal adsorbent as claimed in claim 1, wherein: the alkali solution in the step d) is sodium hydroxide solution or potassium hydroxide solution.
5. The method for producing a polyfunctional metal adsorbent as claimed in claim 1, wherein: in the step c), the molecular weight Wn of polyethyleneimine is 1800, and the polyethyleneimine is added, heated to 40-60 ℃ and stirred to react for 20-28 h.
6. The method for producing a polyfunctional metal adsorbent as claimed in claim 1, wherein: in the step d), dropwise adding an alkali solution to adjust the pH value to 7-9, heating to 60-80 ℃, and stirring for reaction for 12-36 hours.
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| CN110628089A (en) * | 2019-10-11 | 2019-12-31 | 浙江理工大学 | Preparation method of poly-gallic acid/chitosan antibacterial material |
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Citations (6)
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| KR20130019738A (en) * | 2011-08-17 | 2013-02-27 | 대니얼 장 | Process for grafting functional polymers onto cellulose-based filter materials |
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