NL2030794B1 - Preparation method and application of organic-inorganic covalent bond composite coagulant for strengthening coagulation - Google Patents
Preparation method and application of organic-inorganic covalent bond composite coagulant for strengthening coagulation Download PDFInfo
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- 239000000701 coagulant Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 230000015271 coagulation Effects 0.000 title claims abstract description 17
- 238000005345 coagulation Methods 0.000 title claims abstract description 17
- 239000002131 composite material Substances 0.000 title claims abstract description 8
- 238000005728 strengthening Methods 0.000 title abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 24
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 22
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 5
- 125000002091 cationic group Chemical group 0.000 claims description 33
- 239000000178 monomer Substances 0.000 claims description 31
- 239000012266 salt solution Substances 0.000 claims description 30
- 239000011259 mixed solution Substances 0.000 claims description 22
- 229920002401 polyacrylamide Polymers 0.000 claims description 18
- 241000195493 Cryptophyta Species 0.000 claims description 17
- 229920000642 polymer Polymers 0.000 claims description 16
- -1 aluminum ions Chemical class 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 9
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical group NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 7
- 230000000977 initiatory effect Effects 0.000 claims description 7
- RRHXZLALVWBDKH-UHFFFAOYSA-M trimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azanium;chloride Chemical compound [Cl-].CC(=C)C(=O)OCC[N+](C)(C)C RRHXZLALVWBDKH-UHFFFAOYSA-M 0.000 claims description 6
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical group CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 5
- FZGFBJMPSHGTRQ-UHFFFAOYSA-M trimethyl(2-prop-2-enoyloxyethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CCOC(=O)C=C FZGFBJMPSHGTRQ-UHFFFAOYSA-M 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 claims description 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical class [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000002708 enhancing effect Effects 0.000 claims 1
- 150000003839 salts Chemical group 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000013329 compounding Methods 0.000 abstract description 5
- 239000006228 supernatant Substances 0.000 abstract description 5
- 230000003301 hydrolyzing effect Effects 0.000 abstract description 3
- 238000006068 polycondensation reaction Methods 0.000 abstract description 3
- 229910021645 metal ion Inorganic materials 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 229910002803 Si-O-Fe Inorganic materials 0.000 abstract 2
- 229910002800 Si–O–Al Inorganic materials 0.000 abstract 2
- 229910002802 Si–O–Fe Inorganic materials 0.000 abstract 2
- 238000005265 energy consumption Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 20
- 235000010210 aluminium Nutrition 0.000 description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229940117913 acrylamide Drugs 0.000 description 6
- 238000006386 neutralization reaction Methods 0.000 description 5
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 229930002868 chlorophyll a Natural products 0.000 description 3
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- XMLYCEVDHLAQEL-UHFFFAOYSA-N 2-hydroxy-2-methyl-1-phenylpropan-1-one Chemical compound CC(C)(O)C(=O)C1=CC=CC=C1 XMLYCEVDHLAQEL-UHFFFAOYSA-N 0.000 description 2
- 102100024133 Coiled-coil domain-containing protein 50 Human genes 0.000 description 2
- 101000910772 Homo sapiens Coiled-coil domain-containing protein 50 Proteins 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000002390 rotary evaporation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 241001676573 Minium Species 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/001—Macromolecular compounds containing organic and inorganic sequences, e.g. organic polymers grafted onto silica
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D3/00—Differential sedimentation
- B03D3/02—Coagulation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The present disclosure belongs to the technical field of water treatment, and particularly relates to a preparation method and an application of an organic—inorganic covalent bond composite coagulant for strengthening coagulation. The present disclosure utilizes a silane coupling agent to connect organic components and inorganic components, wherein the silane coupling agent and the aluminum ferric salt form Si—O—Al and Si—O—Fe bonds through hydrolytic polycondensation, and the Si—O—Al and Si—O—Fe bonds are connected with the organic component through C = C double bonds, thus realizing covalent bond type compounding. The silicon in the obtained coagulant molecules is tightly combined with aluminum and iron metal ions, thus reducing the residue of the coagulant in the supernatant. In addition, the preparation method provided by the present disclosure has mild reaction conditions, low energy consumption, economical and easily available raw materials, and is convenient for market—scale applications.
Description
P1074 /NLpd
PREPARATION METHOD AND APPLICATION OF ORGANIC-INORGANIC COVALENT
BOND COMPOSITE COAGULANT FOR STRENGTHENING COAGULATION
The present disclosure belongs to the technical field of wa- ter treatment, and particularly relates to a preparation method and an application of an organic-inorganic covalent bond composite coagulant for strengthening coagulation.
Conventional coagulants include inorganic coagulants and or- ganic coagulants. The conventional aluminum salt coagulants have a low cost, but there are problems such as high dosage, low effi- ciency, high residue, and difficult sedimentation; conventional iron salt coagulants can destroy the stability of negatively charged algal cells through electrical neutralization and form flocs with a higher density, but there are problems that the water body is colored after use and corrodes the equipment; the conven- tional organic coagulants have problems of high dosage and strong residual toxicity, etc. The compounding of the existing inorganic coagulants and organic coagulants can improve the algae removal efficiency, reduce the addition amount, and the resulting flocs are large and easy to settle, but the residual content of the co- agulant is still high, the interaction force in the compounding and coagulation process is weak, the stability against hydraulic shearing is not strong, and the dosing method is complicated.
Therefore, the preparation of inorganic-organic composite coagu- lants that are simple to use and stable in structure is the key to effectively reduce iron and aluminum residues.
The present disclosure aims to provide a polymer ferroalu- minium/cationic polyacrylamide covalent bond coagulant and a prep- aration method and an application thereof. The covalent bond coag- ulant provided by the present disclosure has an excellent coagula-
tion effect, efficient algae removal capacity and relatively high settling property, and the coagulant is stable in structure, rela- tively few in residues after coagulation, good in environmental friendliness and simple to use, and can be added at one time.
In order to achieve the above object, the present disclosure provides the following technical solutions:
The present disclosure provides a preparation method of an organic-inorganic covalent bond composite coagulant for strength- ening coagulation. The preparation method comprises the following steps: mixing a silane coupling agent, an aluminum salt solution and an ferric salt solution, adding alkali, and carrying out prehy- drolysis, to obtain an alkaline mixed solution; and mixing the alkaline mixed solution, an organic monomer, a cationic monomer and a photoinitiator, and reacting under the ini- tiation of ultraviolet light, to obtain a polymer ferroalumini- um/cationic polyacrylamide covalent bond coagulant, wherein the organic monomer is acrylamide, and the cationic monomer comprises acryloyloxyethyl trimethyl ammonium chloride, dimethyl diallyl am- monium chloride and methacryloyloxyethyl trimethyl ammonium chlo- ride.
Preferably, the silane coupling agent is vinyltriethox- ysilane.
Preferably, the concentration of aluminum ions in the alumi- num salt solution is 0.5-2.0 mol/L, and the concentration of iron ions in the ferric salt solution is 0.5 -2.0 mol/L.
Preferably, the molar ratio of the aluminum ions in the alu- minum salt solution to the iron ions in the ferric salt solution is (7-9):1.
Preferably, the ratio of the total molar weight of aluminum elements in the aluminum salt solution and the iron elements in the ferric salt solution to the molar weight of silicon elements in the silane coupling agent is 1:(0.1-0.8).
Preferably, the mass ratio of the silane coupling agent to the organic monomer is 0.15-0.25.
Preferably, the mass ratio of the organic monomer to the cat- ionic monomer is (2-3):1.
Preferably, the power of ultraviolet light is 10-100 W, and the wavelength of the ultraviolet light is 253.7 nm or 185 nm.
The present disclosure also provides an application of the polymer ferroaluminium/cationic polyacrylamide covalent bond coag- ulant in algae-containing water treatment.
The present disclosure provides a preparation coagulation method of the organic-inorganic covalent bond composite coagulant for strengthening coagulation. The preparation method comprises the following steps:mixing a silane coupling agent, an aluminum salt solution and an ferric salt solution to obtain a mixed solu- tion; mixing the mixed solution with an alkali solution to obtain an alkaline mixed solution; mixing the alkaline mixed solution, an organic monomer, a cationic monomer and a photoinitiator, and re- acting under the initiation of ultraviolet light, to obtain a pol- ymer ferroaluminium/cationic polyacrylamide covalent bond coagu- lant, wherein the organic monomer is acrylamide, and the cationic monomer comprises acryloyloxyethyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride and methacryloyloxyethyl trime- thyl ammonium chloride. According to the present disclosure, the silane coupling agent is utilized to connect an organic component cationic polyacrylamide with an inorganic component aluminum fer- ric salt, wherein the silane coupling agent and the aluminum fer- ric salt form Si-0-Al and Si-0O-Fe bonds through hydrolytic poly- condensation, and the Si-0-Al and Si-0-Fe bonds are connected with the organic component through C = C double bonds, thus realizing covalent bond type compounding. The silicon in the obtained coagu- lant molecules is tightly combined with aluminum and iron metal ions, thus reducing the residue of the coagulant in the superna- tant. In addition, the preparation method provided by the present disclosure has the advantages of mild reaction conditions, low en- ergy consumption, and economical and easily available raw materi- als, and is convenient for market scale application. The covalent bond coagulant provided by the present disclosure combines the ad- vantages of an inorganic coagulant and also combines the ad- vantages of an organic coagulant, wherein the aluminum salt has strong electrical neutralization capacity, and ferric salt hydrol- ysate has high positive charge density, so the stability of nega-
tively charged algae cells can be destroyed through electrical neutralization to form floc with high compactness, and the pH ap- plication range is wide; and the compactness of the floc can be increased while the electrical neutralization capacity is enhanced through combination of an aluminum salt coagulant and a ferric salt coagulant, so that the algae floc is prevented from floating upwards. In addition, the organic coagulant is introduced in order to reduce the dosage, an acrylamide monomer has strong adsorption bridging capacity and high activity, alum floc formed by coagula- tion in a water body is large and is fast in sedimentation, and the purification capacity is 2-3 times higher than that of other water-soluble high-molecular polymers; and moreover, the cationic monomer is also introduced, and the guaternary ammonium group con- tained in the cationic monomer can enhance the electrical neutral- ization capacity of the coagulant, and thus the algae removal ca- pacity is enhanced.
The organic component and the inorganic component in the co- agulant provided by the present disclosure are connected through covalent bonds; compared with the floc formed by a traditional in- organic coagulant PAC, the combination of the covalent bonds makes up the defect that a floc of a traditional aluminum-based coagu- lant is loose; and iron and the organic coagulant are introduced so that the particle size and the compactness of the floc are in- creased, the sedimentation of the floc is facilitated in the coag- ulation algae removal process, and a good foundation can be laid for the later filtering stage.
In addition, residues are easily caused in the coagulation process of the traditional aluminum coagulant, and the literature proves that the residual quantity of the aluminum coagulant is the lowest when the pH value is 6.5, but the pH value of the algae- containing water is far higher than 6.5, so residues are easily caused in the algae-containing water. According to the present disclosure, the inorganic component and the organic component are combined through covalent bonds, and the residues in the water af- ter coagulation of the obtained polymer ferroaluminium/cationic polyacrylamide covalent bond coagulant are greatly reduced. After the coagulant provided by the present disclosure is used for treating the algae-containing water, the residual quantities of Al and Fe in the supernatant of the algae-containing water are re- spectively 12.47 ug/L and 9.64 ug/L and are far lower than the re- quirements of the national standard (Standard for Drinking Water 5 Quality (GB 5749-2006)) that the aluminum content is not more than 0.2 mg/L and the iron content is not more than 0.3 mg/L.
The present disclosure provides a preparation method of a polymer ferroaluminium/cationic polyacrylamide covalent bond coag- ulant. The preparation method comprises the following steps: mixing a silane coupling agent, an aluminum salt solution and an ferric salt solution, adding alkali, and carrying out prehy- drolysis, to obtain an alkaline mixed solution; and mixing the al- kaline mixed solution, an organic monomer, a cationic monomer and a photoinitiator, and reacting under the initiation of ultraviolet light, to obtain a polymer ferrcaluminium/cationic polyacrylamide covalent bond coagulant, wherein the organic monomer is acryla- mide, and the cationic monomer comprises acryloyloxyethyl trime- thyl ammonium chloride, dimethyl diallyl ammonium chloride and methacryloyloxyethyl trimethyl ammonium chloride.
According to the present disclosure, a silane coupling agent, an aluminum salt solution and a ferric salt solution are mixed to obtain a mixed solution. In the present disclosure, the silane coupling agent is preferably vinyltriethoxysilane, the aluminum salt solution is preferably aluminum chloride, the ferric salt so- lution is preferably ferric chloride, the concentration of alumi- num ions in the aluminum salt solution is preferably 0.5-2.0 mol/L, and further preferably 1-1.5 mol/L; the concentration of iron ions in the ferric salt solution is preferably 0.5-2.0 mol/L, and further preferably 1-1.5 mol/L; the molar ratio of aluminum ions in the aluminum salt solution to iron ions in the ferric salt solution is preferably (7-9):1, and further preferably 2:1; and the ratio of the total molar weight of aluminum element in the aluminum salt sclution and iron element in the ferric salt solu- tion to the molar weight of silicon element in the silane coupling agent is 1:(0.1-0.8), and further preferably 1:(0.2-0.6). In the specific embodiments of the present disclosure, the silane cou- pling agent, the aluminum salt solution and the ferric salt solu- tion are preferably added into a container, and then are mixed evenly under the condition of a stirring speed of 300-600 rpm to obtain the mixed solution.
After the mixed solution is obtained, the mixed solution is mixed with an alkali solution to obtain an alkaline mixed solu- tion. In the present disclosure, the alkali solution is preferably a sodium hydroxide solution, and the concentration of the sodium hydroxide solution is preferably 0.5-2.0 mol/L, and further pref- erably 1 mol/L. In the specific embodiments of the present disclo- sure, preferably, the alkali solution is slowly added dropwise in- to the mixed solution under the condition that the stirring speed is 250-500 rpm to obtain the alkaline mixed solution; and prefera- bly, the alkalization degree of the obtained alkaline mixed solu- tion is controlled to be 2.0. After the alkaline mixed solution is obtained, the alkaline mixed solution, an organic monomer, a cati- onic monomer and a photoinitiator are mixed and react under the initiation of ultraviolet light to obtain a polymer ferroalumini- um/cationic polyacrylamide covalent bond coagulant. In the present disclosure, the organic monomer is preferably acrylamide, the cat- ionic monomer is preferably acryloyloxyethyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride and methacryloyloxy- ethyl trimethyl ammonium chloride, and further preferably methac- ryloyloxyethyl trimethyl ammonium chloride; the mass ratio of the silane coupling agent to the organic monomer is preferably 0.15- 0.25, and further preferably 0.2; the mass ratio of the organic monomer to the cationic monomer is (2-3):1, and further preferably 2:1; and the power of the ultraviolet light is preferably 10-100
W, and further preferably 40-60 W; and the wavelength of the ul- traviolet light is preferably 253.7 nm or 185 nm.
After the reaction is finished, the obtained product feed liquid is dried and ground to obtain the polymer ferroalumini- um/cationic polyacrylamide covalent bond coagulant.
The organic component cationic polyacrylamide is connected with the inorganic component aluminum ferric salt by adopting the silane coupling agent, the silane coupling agent and the inorganic component aluminum salt are subjected to hydrolytic polycondensa- tion through Si-0-Al and Si-0-Fe, and the silane coupling agent is connected with the organic component through C = C double bonds, thus compounding in a covalent bond form is realized, and the pol- ymer ferroaluminium/cationic polyacrylamide covalent bond coagu- lant is obtained.
The present disclosure also provides the polymer ferroalumin- ium/cationic polyacrylamide covalent bond coagulant prepared by the above preparation method. The coagulant provided by the pre- sent disclosure has relatively strong electrical property neutral- izing capacity and dissolving property, has relatively high charge density and efficient algae removal capacity, is wide in pH appli- cation range, can form a floc with relatively high compactness during coagulation, and is high in settling property. After coagu- lation, the covalent bond coagulant provided by the present dis- closure is low in residue in water, and is lower in residue than polymer ferroaluminium, polymeric aluminum chloride, polymeric ferric chloride, etc. which are independently used.
The present disclosure also provides an application of the polymer ferroaluminium/cationic polyacrylamide covalent bond coag- ulant in the above solution in algae-containing water treatment.
In the present disclosure, the dosage of the polymer ferroalumini- um/cationic polyacrylamide covalent bond coagulant in the algae- containing water is preferably 40-70 mg/L; in the specific embodi- ments of the present disclosure, the pH value of the algae- containing water is 7-9, the turbidity is 8.5-14 NTU, and the chlorophyll a content is 20-45 pg/L; and the present disclosure has no special requirement on the specific application method, and can be applied by adopting the method well known by the those skilled in the art.
Example 1 3.5 mL of analytically pure vinyltriethoxysilane solution, 36 mL of AlCl; solution with the concentration of 1.0 mol/L and 4 mL of FeCl: solution with the concentration of 1 mol/L were mixed in a three-neck flask and uniformly stirred at room temperature and a speed of 100 rpm, and 80 mL of NaOH solution with the concentra- tion of 1 mol/L was slowly added dropwise under a stirring condi-
tion of 300 rpm until the alkalization degree B was 2.0, to obtain an alkaline mixed solution.
Rotary evaporation was carried out on the alkaline mixed so- lution to remove byproducts generated by reaction, and then water was added to fix the volume until the concentration of total alu- minum iron element was 0.3 mol/L. 30 mL of the solution after volume fixing was taken, 2.44 g of acrylamide and 1.22 g of methacryloyloxyethyl trimethyl ammoni- um chloride were sequentially added and uniformly stirred, then high-purity nitrogen was introduced to remove oxygen, 0.018 g of photoinitiator 2-hydroxy-2-methyl propiophenone was added under the protection of nitrogen and uniformly stirred, and then sealing was carried out.
The sealed solution was reacted for 3 h under the initiation of ultraviolet light, and a product was dried and grinded to ob- tain a polymer ferroaluminium/cationic polyacrylamide covalent bond coagulant 2 which was recorded as CAMF, 3, wherein 0.4 repre- sented the molar ratio of Si/ (Al + Fe).
Algae-containing water was treated by using the obtained
CAMFy ; with the addition amount of 69 mg/L, wherein the turbidity removal rate was 87%, the chlorophyll a removal rate was 72%, and the residual amounts of aluminum and iron in supernatant of the algae-containing water were 12.47 ug/L and 9.64 ug/L respectively.
Example 2 5.2 mL of analytically pure vinyltriethoxysilane solution, 36 mL of AlCl; solution with the concentration of 1.0 mol/L and 4 mL of FeCl; solution with the concentration of 1 mol/L were mixed in a three-neck flask and uniformly stirred at room temperature and a speed of 100 rpm, and 80 mL of NaOH solution with the concentra- tion of 1 mol/L was slowly added dropwise under a stirring condi- tion of 300 rpm until the alkalization degree B was 2.0, to obtain an alkaline mixed solution.
Rotary evaporation was carried out on the alkaline mixed so- lution to remove byproducts generated by reaction, and then water was added to fix the volume until the concentration of total alu- minum iron element was 0.3 mol/L. 30 mL of the solution after volume fixing was taken, 3.63 g of acrylamide and 1.82 g of methacryloyloxyethyl trimethyl ammoni- um chloride were sequentially added and uniformly stirred, then high-purity nitrogen was introduced to remove oxygen, 0.027 g of photoinitiator 2-hydroxy-2-methyl propiophenone was added under the protection of nitrogen and uniformly stirred, and then sealing was carried out.
The sealed solution was reacted for 3 h under the initiation of ultraviolet light, and a product was dried and grinded to ob- tain a polymer ferrcaluminium/cationic polyacrylamide covalent bond coagulant 3 which was recorded as CAMF 4, wherein 0.6 repre- sented the molar ratio of Si/ (Al + Fe).
Algae-containing water was treated by using the obtained
CAMF;.e with the addition amount of 40 mg/L, wherein the turbidity removal rate was 87%, the chlorophyll a removal rate was 97%, and the residual amounts of aluminum and iron in supernatant of the algae-containing water were 15.12 ug/L and 11.08 ug/L respective- ly.
Although the present disclosure has been described in detail in conjunction with the foregoing embodiments, these embodiments are only part of instead of all of the embodiments. Other embodi- ments can be obtained without creative efforts based on the embod- iments, and all these embodiments shall fall within the scope of protection of the present disclosure.
Claims (10)
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| JP2013031838A (en) * | 2011-06-29 | 2013-02-14 | Sanyo Chem Ind Ltd | Organic/inorganic hybrid polymer flocculant |
| CN105152291B (en) * | 2015-08-12 | 2017-09-22 | 成都理工大学 | Poly aluminium iron silicate acrylamide copolymer composite flocculation agent and preparation method thereof |
| CN112920351A (en) * | 2021-01-27 | 2021-06-08 | 成都高云智新材料科技有限公司 | Hybrid sewage treatment flocculant and preparation method thereof |
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