CN116693886A - Boric acid esterification crosslinked sodium carboxymethyl cellulose hydrogel - Google Patents
Boric acid esterification crosslinked sodium carboxymethyl cellulose hydrogel Download PDFInfo
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- 239000000017 hydrogel Substances 0.000 title claims abstract description 34
- 229920002785 Croscarmellose sodium Polymers 0.000 title claims abstract description 9
- 239000001767 crosslinked sodium carboxy methyl cellulose Substances 0.000 title claims abstract description 9
- 235000010947 crosslinked sodium carboxy methyl cellulose Nutrition 0.000 title claims abstract description 9
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 title claims abstract description 8
- 239000004327 boric acid Substances 0.000 title claims abstract description 8
- 230000032050 esterification Effects 0.000 title claims abstract description 8
- 238000005886 esterification reaction Methods 0.000 title claims abstract description 8
- 239000002351 wastewater Substances 0.000 claims abstract description 46
- 125000002091 cationic group Chemical group 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 25
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims abstract description 25
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims abstract description 25
- 238000004043 dyeing Methods 0.000 claims abstract description 24
- 229910021538 borax Inorganic materials 0.000 claims abstract description 14
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 14
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 8
- 150000001768 cations Chemical class 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000002244 precipitate Substances 0.000 claims description 4
- 239000008213 purified water Substances 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000000706 filtrate Substances 0.000 claims 1
- 239000000975 dye Substances 0.000 abstract description 39
- 241000083869 Polyommatus dorylas Species 0.000 abstract description 10
- YXZRCLVVNRLPTP-UHFFFAOYSA-J turquoise blue Chemical compound [Na+].[Na+].[Na+].[Na+].[Cu+2].NC1=NC(Cl)=NC(NC=2C=C(NS(=O)(=O)C3=CC=4C(=C5NC=4NC=4[N-]C(=C6C=CC(=CC6=4)S([O-])(=O)=O)NC=4NC(=C6C=C(C=CC6=4)S([O-])(=O)=O)NC=4[N-]C(=C6C=CC(=CC6=4)S([O-])(=O)=O)N5)C=C3)C(=CC=2)S([O-])(=O)=O)=N1 YXZRCLVVNRLPTP-UHFFFAOYSA-J 0.000 abstract description 10
- 239000000701 coagulant Substances 0.000 abstract description 6
- 229920000642 polymer Polymers 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 5
- 239000000499 gel Substances 0.000 abstract description 3
- 239000004615 ingredient Substances 0.000 abstract description 2
- 239000013049 sediment Substances 0.000 abstract 2
- 239000000243 solution Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 6
- 238000004065 wastewater treatment Methods 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 2
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000000981 basic dye Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000005277 cation exchange chromatography Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/08—Cellulose derivatives
- C08J2301/26—Cellulose ethers
- C08J2301/28—Alkyl ethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses boric acid esterification crosslinked sodium carboxymethyl cellulose hydrogel which is used for treating printing and dyeing wastewater containing cationic dyes. The weight ratio of the ingredients is as follows: 10 to 20 parts of sodium carboxymethyl cellulose, 5 to 10 parts of borax and 100 to 300 parts of water. The sodium carboxymethyl cellulose and borax are esterified and crosslinked to produce a polymer gel which is longer than the molecular chain of the raw material and has electronegativity, and the polymer gel and the cationic dye in the wastewater form large-mass and large-volume sediment, and finally the flocculent sediment is filtered out to purify the printing and dyeing wastewater. The sodium carboxymethyl cellulose hydrogel crosslinked by boric acid esterification is used as a coagulant, and the removal rate of the cationic turquoise blue GB and cationic blue FGL dyes is over 93 percent.
Description
Technical Field
The invention relates to the field of dye wastewater treatment, in particular to boric acid esterification crosslinked sodium carboxymethyl cellulose hydrogel which is used for agglomerating cationic dye and pollutants with positive charge particles in wastewater.
Background
The printing and dyeing process has more stages and complex flow. The fiber types and the printing and dyeing processes are different, and the wastewater amount and the water quality are also different. The printing and dyeing wastewater has large water consumption, and the water consumption for processing each ton of textiles in printing and dyeing is 100-200 tons, wherein 80% -90% of the wastewater is discharged. The dyeing wastewater has high pollutant content and high alkalinity, contains dye, sizing agent, auxiliary agent, fiber, inorganic salt and the like, and belongs to one of industrial wastewater which is difficult to treat.
The current method for treating the printing and dyeing wastewater comprises the following steps: chemical oxidation, physical adsorption, electrolysis, coagulation. The method has various characteristics and is suitable for different types of printing and dyeing wastewater. Wherein, the coagulation method is widely applied to the treatment of wastewater in the printing and dyeing industry. The coagulation method has the advantages of simple process flow, convenient operation and management, less equipment investment and small occupied area. At present, most of the coagulant in the market is mainly aluminum salt or ferric salt, wherein the bridging adsorption performance of basic aluminum chloride is better, and the price of ferrous sulfate is the lowest. In recent years, the amount of polymer coagulant has been increasing, and inorganic coagulants have been gradually replaced. Sodium carboxymethyl cellulose is used as a flocculant in water treatment for wastewater treatment. The sodium carboxymethyl cellulose is used as a coagulant to treat hydrophobic dye with high decoloring efficiency, but the decoloring efficiency is poor for soluble dye.
Cationic dyes, also known as basic dyes, are soluble in water and ionize in aqueous solution to produce positively charged colored ions. The flocculant can combine pollutant particles in water, aggregate and settle, so that impurities in the water body are removed. For the treatment of soluble cationic dyes, the flocculation method has poor efficiency and much left pollution, and the problem of weak adsorption and aggregation capacity of the cationic dyes by the flocculation method is solved by increasing the dosage. Against this background, there is an urgent need in the market for a product aimed at treating wastewater containing positively charged contaminants such as cationic dyes.
Disclosure of Invention
The invention is focused on the technical problem of the current dyeing industry in the aspect of cationic dye wastewater treatment, and provides a polymer gel suitable for dyeing cationic dye wastewater treatment.
In order to solve the problems, the technical selection of the borate crosslinked sodium carboxymethyl cellulose hydrogel is provided, and the sodium carboxymethyl cellulose, borax and water are crosslinked in alkaline conditions to form the polymer hydrogel flocculant containing the negatively charged borate.
The hydrogel comprises the following components in parts by weight: 5-10 parts of borax, 10-20 parts of sodium carboxymethylcellulose and 100-300 parts of water;
the preparation process of the flocculant is as follows:
firstly, adding water into sodium carboxymethyl cellulose in proportion, heating to enable the temperature of the system to be 50-80 ℃, and adjusting the pH value of the system to be within a numerical range of 8-10;
stirring and adding borax into the sodium carboxymethyl cellulose solution containing alkali liquor according to a proportion, controlling the pH value of the system to be 8-10, controlling the reaction temperature to be 40-80 ℃ and controlling the reaction time to be in the range of 2-4 hours;
and thirdly, cooling the solution after the reaction is finished and waiting for the formation of hydrogel.
The printing and dyeing wastewater is dye wastewater containing cations and also contains sewage with positively charged impurities.
The application method of the hydrogel comprises the following steps:
adding hydrogel into the printing and dyeing wastewater containing cations, stirring for 0.5-2 hours, standing for 6-8 hours, and filtering to remove flocculent precipitate to purify the dye wastewater.
Treating cationic printing and dyeing wastewater, wherein the weight ratio of the hydrogel to cationic dye in the dye wastewater is 20:1 to 5:1.
the beneficial effects are that: the hydrogel for treating the wastewater containing cations in the printing and dyeing industry provided by the invention is subjected to a targeted treatment experiment on the wastewater. The product has good adsorption effect on positive substances in the wastewater due to negative ions generated by crosslinking, and can efficiently remove positively charged pollutants.
Because the sodium carboxymethyl cellulose has a long molecular chain, contains a large number of carboxyl, hydroxyl and other active groups, and forms a net structure after boric acid esterification and crosslinking, cationic dye can be adsorbed by electrostatic attraction to form flocculent substances, and finally the aim of purifying printing and dyeing wastewater can be achieved by filtration.
Detailed Description
The invention is more particularly illustrated in the following description with reference to examples. The wastewater impurities produced in the dyeing industry in which the objects to be treated in the examples and comparative examples contain positively charged ions are cationic turquoise blue GB (CAS No. 33203-82-6) and cationic blue FGL (CAS No. 12217-41-3). The initial concentration of the cationic turquoise blue GB and the cationic blue FGL in the wastewater is 100mg/L.
Examples and comparative examples detection methods for cationic dyes used: the standard solution is prepared by cation chromatography, a wastewater sample to be treated and a water sample which is treated are respectively filtered by a microporous filter membrane, a system which is separated by a CS12A type cation separation column is introduced into an ICS-90 ion chromatograph, wherein 20mmol/L of methanesulfonic acid is used as a leaching solution, the flow rate is 0.88mL/min, the inhibiting current is 59mA, the sample injection amount is 10 mu L, the room temperature is 14 ℃, the system pressure is 1800psi, and the corresponding concentration can be obtained by the drawn standard curve and the corresponding cation spectrogram.
Wastewater treatment procedures and ingredients such as those described in the examples and comparative examples, the wastewater treated cationic dye removal rates are shown in table 1.
Example 1
10 g of sodium carboxymethyl cellulose, 5 g of borax and 150 g of water are taken. Firstly, adding water into sodium carboxymethyl cellulose in a ratio to obtain a solution system, further continuously heating the solution system to the system temperature of 60 ℃, and then adjusting and stabilizing the pH value of the system to 9. And adding borax into the heating liquid in proportion in the stirring process, and reacting for 3 hours. The solution after the reaction is cooled. The hydrogel formed after the solution is cooled can be added into the wastewater to be treated.
The weight ratio of the hydrogel to the cationic dye in the dye wastewater is selected to be 15:1. and respectively taking 10L of cationic turquoise blue GB and cationic blue FGL wastewater. 1.5 g of each hydrogel was added to the dyeing wastewater containing cationic turquoise blue GB or cationic blue FGL, respectively.
Continuously stirring the wastewater added with the hydrogel for 1 hour, standing the stirred solution for 7 hours, and filtering to remove flocculent precipitate, namely purified water.
Example 2
The weight ratio of hydrogel to cationic dye in dye wastewater in example 1 was adjusted to 10:1, adding the hydrogel into printing and dyeing wastewater containing cationic turquoise blue GB or cationic blue FGL respectively.
The rest of the procedure is the same as in example 1.
Example 3
The raw materials used in the product in the example 1 are changed into 15 g of sodium carboxymethyl cellulose, 7 g of borax and 180 g of water according to the mass ratio of each substance.
The weight ratio of hydrogel to cationic dye in dye wastewater in example 1 was adjusted to 8:1.
the rest of the procedure is the same as in example 1.
Example 4
The raw materials used in the product in the example 1 are changed into 15 g of sodium carboxymethyl cellulose, 7 g of borax and 180 g of water according to the mass ratio of each substance.
The weight ratio of hydrogel to cationic dye in dye wastewater in example 1 was adjusted to 10:1.
the heating temperature of the system in example 1 was changed to 70 ℃.
The reaction time after borax addition in example 1 was changed to 3.5 hours.
The rest of the procedure is the same as in example 1.
Example 5
The raw materials used in the product in the example 1 are changed into 15 g of sodium carboxymethyl cellulose, 10 g of borax and 150 g of water according to the mass ratio of each substance.
The weight ratio of hydrogel to cationic dye in dye wastewater in example 1 was adjusted to 12:1.
the rest of the procedure is the same as in example 1.
Example 6
The raw materials used in the product in the example 1 are changed into 10 g of sodium carboxymethyl cellulose, 10 g of borax and 150 g of water according to the mass ratio of each substance.
The weight ratio of hydrogel to cationic dye in the dye wastewater is 15:1.
the rest of the procedure is the same as in example 1.
Comparative example 1
15 g of sodium carboxymethylcellulose and 180 g of water are taken. Adding water into sodium carboxymethyl cellulose according to a proportion, heating the system to 60 ℃ and regulating the pH value to 9 to obtain sodium carboxymethyl cellulose solution, slightly stirring the solution for 3 hours, cooling, adding the cooled solution into wastewater to be treated, stirring for 1 hour, standing for 7 hours, and filtering to remove flocculent precipitate generated to obtain purified water solution.
The weight ratio of the sodium carboxymethyl cellulose solution to the cationic dye in the dye wastewater is 12:1, respectively adding the hydrogel into printing and dyeing wastewater containing cationic turquoise blue GB or cationic blue FGL.
Comparative example 2
18 g of sodium carboxymethylcellulose and 120 g of water are taken. The remaining procedure was the same as comparative example 1.
TABLE 1 removal rate of cationic turquoise blue GB and cationic blue FGL dye in printing and dyeing wastewater
| Treated waste water | Cationic turquoise blue GB dye removal% | Cationic blue FGL dye removal% |
| Example 1 | 98.6 | 95.3 |
| Example 2 | 93.2 | 93.6 |
| Example 3 | 95.9 | 96.1 |
| Example 4 | 97.2 | 96.8 |
| Example 5 | 98.1 | 96.3 |
| Example 6 | 93.9 | 98.8 |
| Comparative example 1 | 24.8 | 27.3 |
| Comparative example 2 | 28.1 | 32.7 |
From the results shown in table 1, it was found that the removal rate of the sodium carboxymethyl cellulose hydrogel crosslinked by boric acid esterification as a coagulant for the treatment of the cationic turquoise blue GB and the cationic blue FGL dye was significantly improved to 93% or more as compared with the sodium carboxymethyl cellulose alone. The above-described embodiments are merely preferred examples of the present invention, which are intended to cover modifications made by persons of ordinary skill in the art, which remain within the broad teachings of the present invention.
Claims (4)
1. The boric acid esterification crosslinked sodium carboxymethyl cellulose hydrogel is characterized by comprising the following components in parts by weight: 10-20 parts of sodium carboxymethyl cellulose, 5-10 parts of borax and 100-200 parts of water; the hydrogel is used for treating printing and dyeing wastewater and removing cationic dye in the wastewater;
the preparation method of the hydrogel comprises the following steps:
step one: adding water into sodium carboxymethyl cellulose in proportion, heating to make the system temperature be 40-80 ℃, and then regulating the pH value of the system to be in a stable numerical range;
step two: stirring and adding borax into the hot solution according to a proportion, wherein the reaction time is controlled within a range of 2-4 hours;
step three: after the reaction was completed, the solution was allowed to cool and await the formation of a hydrogel.
2. The borated crosslinked sodium carboxymethylcellulose hydrogel of claim 1, wherein the alkaline condition pH is 8 to 10.
3. A borated crosslinked sodium carboxymethyl cellulose hydrogel according to claim 1, characterized by the method of use: adding hydrogel into the printing and dyeing wastewater containing cations, stirring for 0.5-2 hours, standing for 6-8 hours, filtering to remove flocculent precipitate, and obtaining filtrate, namely purified water.
4. The method of using a borated crosslinked sodium carboxymethylcellulose hydrogel according to claim 3, wherein the weight ratio of the hydrogel to the cationic dye in the dye wastewater is 20:1 to 5:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310665517.1A CN116693886A (en) | 2023-06-07 | 2023-06-07 | Boric acid esterification crosslinked sodium carboxymethyl cellulose hydrogel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310665517.1A CN116693886A (en) | 2023-06-07 | 2023-06-07 | Boric acid esterification crosslinked sodium carboxymethyl cellulose hydrogel |
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