CN107082476B - Polymeric ferric acetate and preparation method and application thereof - Google Patents
Polymeric ferric acetate and preparation method and application thereof Download PDFInfo
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- CN107082476B CN107082476B CN201710192586.XA CN201710192586A CN107082476B CN 107082476 B CN107082476 B CN 107082476B CN 201710192586 A CN201710192586 A CN 201710192586A CN 107082476 B CN107082476 B CN 107082476B
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- PVFSDGKDKFSOTB-UHFFFAOYSA-K iron(3+);triacetate Chemical compound [Fe+3].CC([O-])=O.CC([O-])=O.CC([O-])=O PVFSDGKDKFSOTB-UHFFFAOYSA-K 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 73
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 44
- 239000011574 phosphorus Substances 0.000 claims abstract description 44
- 239000002351 wastewater Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229960000583 acetic acid Drugs 0.000 claims abstract description 28
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 24
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 24
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 24
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000011259 mixed solution Substances 0.000 claims abstract description 21
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims abstract description 15
- 239000000243 solution Substances 0.000 claims abstract description 15
- 150000002500 ions Chemical class 0.000 claims abstract description 12
- 239000012263 liquid product Substances 0.000 claims abstract description 12
- 239000012362 glacial acetic acid Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 239000007800 oxidant agent Substances 0.000 claims abstract description 7
- 230000001590 oxidative effect Effects 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims abstract description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 26
- 229910001448 ferrous ion Inorganic materials 0.000 claims description 26
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 11
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 abstract description 22
- 239000008394 flocculating agent Substances 0.000 abstract description 15
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 8
- 229910001447 ferric ion Inorganic materials 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- 238000004062 sedimentation Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241000195493 Cryptophyta Species 0.000 description 2
- 229910017135 Fe—O Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 230000000877 morphologic effect Effects 0.000 description 2
- 208000012868 Overgrowth Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- -1 comprises physical Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Classifications
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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
- C02F1/52—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
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a preparation method of polyferric acetate, which comprises the following steps: dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature to obtain a ferrous sulfate solution, sequentially adding glacial acetic acid and an oxidant, uniformly mixing to obtain a mixed solution, carrying out water bath treatment to remove impurity ions to obtain a reddish brown liquid product, and drying to obtain the solid polymerized ferric acetate. The invention also discloses a polymeric ferric acetate. The invention also discloses an application of the polyferric acetate. According to the invention, acetic acid is adopted to replace sulfuric acid and hydrochloric acid to prepare the flocculating agent of the polyferric, compared with corrosion caused by sulfate ions and chloride ions, the polyferric contains counter-ion acetate ions, so that the corrosivity caused by the counter-ion acetate ions is relatively small, and the dephosphorization rate and the turbidity removal rate are high when the phosphorus-containing wastewater is treated, wherein the turbidity removal rate can reach more than 95%, and the dephosphorization rate can reach more than 93%.
Description
Technical Field
The invention relates to the technical field of water treatment agents, and particularly relates to polyferric acetate, and a preparation method and application thereof.
Background
Due to the rapid development of urbanization, industrialization and agriculture, a large amount of phosphorus-containing substances are discharged into water. Although the phosphorus element is beneficial to an ecosystem, excessive phosphorus-containing compounds in the fresh water are absorbed by algae and plants to cause overgrowth of the algae and the plants, so that the balance of organic matters in the water body is damaged, the water quality is deteriorated to cause environmental pollution and generate the eutrophication phenomenon of the water body. In order to prevent eutrophication of water bodies, many countries have strict regulations on the amount of phosphorus discharged into water bodies, and thus many studies have been conducted around phosphorus removal in recent decades. The process for reducing the phosphorus content in the wastewater mainly comprises physical, chemical and biological processes, and among the treatment methods, the flocculation method is the most important and common chemical treatment process in the wastewater treatment process due to the advantages of simplicity, low cost, small environmental impact and the like. Therefore, much research has been conducted around improving the flocculation process, wherein the more used flocculants are aluminum and iron flocculants. Aluminum flocculants are particularly widely used, but aluminum flocculants are potentially harmful to human health, and thus iron flocculants are currently preferred, and recently, many researchers have conducted extensive studies on iron flocculants, but most of them are polymeric iron sulfate (zuoboulis, a.i., Moussas, p.a., 2008. polymeric sulfate: Preparation, catalysis and application in association experiments [ j.hazard. mater.155: 459-. Because polyferric sulfate and polyferric chloride contain sulfate ions, chloride ions and the like, different problems are caused in the using process, for example, chloride ions can cause pollution and the like, and not only can the steel structure be corroded, but also the concrete structure can be corroded; sulfate ions can also cause corrosion of other materials.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides the polyferric acetate and the preparation method and the application thereof, the flocculant of the polyferric acetate is prepared by adopting acetic acid to replace sulfuric acid and hydrochloric acid, compared with the corrosion caused by sulfate ions and chloride ions, the polyferric acetate has relatively low corrosivity caused by counter-ion acetate ions, and the dephosphorization rate and the turbidity removal rate are high when the phosphorus-containing wastewater is treated.
The invention provides a preparation method of polyferric acetate, which comprises the following steps: dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature to obtain a ferrous sulfate solution, sequentially adding glacial acetic acid and an oxidant, uniformly mixing to obtain a mixed solution, carrying out water bath treatment to remove impurity ions to obtain a reddish brown liquid product, and drying to obtain the solid polymerized ferric acetate.
Preferably, the concentration of the ferrous ions in the ferrous sulfate solution is 1.80-1.90 mol/L.
Preferably, the molar ratio of ferrous ions to acetic acid in the mixed solution is 1: 3.5-4.5, wherein the molar ratio of ferrous ions to the oxidant is 5.5-5.6: 1.
preferably, the oxidant is one or a combination of more than two of potassium chlorate, sodium chlorate and hydrogen peroxide.
Preferably, the temperature of the water bath treatment is 50-70 ℃, and the time of the water bath treatment is 5-7 h.
Preferably, the drying temperature is 48-52 ℃.
The invention also provides a polymeric ferric acetate which is prepared by the preparation method of the polymeric ferric acetate.
Preferably, it has a three-dimensional structure of clusters and layers.
The invention also provides application of the polyferric acetate in treating phosphorus-containing wastewater.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, acetic acid is used as an acidity control agent, so that corrosion of sulfate ions, chloride ions and the like introduced by using sulfuric acid, hydrochloric acid and the like to equipment is avoided, and meanwhile, the acetate ions are introduced as counter ions to enable the water treatment agent to polymerize ferric acetate to form a cluster-shaped and layered three-dimensional structure containing-OH, Fe-O, C-C, -COO and other groups, so that the flocculation performance is greatly improved;
(2) a large amount of by-product ferrous sulfate heptahydrate is produced every year in a titanium dioxide factory in China, so that the production cost of the invention is low;
(3) the polyferric acetate obtained by the method has strong electric neutralization, net-catching and adsorption bridging capabilities, and the turbidity removal rate of the polyferric acetate on phosphorus-containing wastewater can reach more than 95 percent and the phosphorus removal rate can reach more than 93 percent.
Drawings
FIG. 1 is a scanning electron micrograph of the polymerized iron acetate obtained in example 1 of the present invention.
FIG. 2 is an infrared spectrum of the polymeric ferric acetate obtained in example 1 of the present invention.
FIG. 3 is a graph showing the comparison between the turbidity removal rate and the phosphorus removal rate of the polymeric ferric acetate obtained at different reaction temperatures in examples 1 to 3 of the present invention.
FIG. 4 is a graph showing the comparison between the turbidity removal rate and the phosphorus removal rate of the polymeric ferric acetate obtained in examples 1, 4 and 5 of the present invention at different reaction times.
FIG. 5 is a graph showing the comparison of the turbidity removal rate and the phosphorus removal rate of the polymeric ferric acetate obtained in examples 1, 6 and 7 of the present invention at different molar ratios of ferrous ions to acetic acid.
FIG. 6 is a graph showing the comparison between the turbidity removal rate and the phosphorus removal rate of the polymeric ferric acetate obtained in example 8 of the present invention at different settling times.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
Dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature (15-25 ℃) to obtain a ferrous sulfate solution, wherein the ferrous ion concentration is 1.80 mol/L, sequentially adding glacial acetic acid and potassium chlorate to be uniformly mixed during continuous stirring to obtain a mixed solution, wherein the molar ratio of the ferrous ion to the acetic acid is 1: 4.0, and the molar ratio of the ferric ion to the potassium chlorate is 5.6: 1, then placing the mixed solution in a constant-temperature water bath kettle at the temperature of 60 ℃ to react for 6 hours, and removing impurity ions to obtain a reddish-brown liquid product polymerized ferric acetate.
The liquid product obtained in example 1 was dried at 50 ℃ and the morphological features of the prepared sample were analyzed using a model SU1510 Scanning Electron Microscope (SEM) and shimadzu Nicolet-380 fourier infrared spectrometer.
Fig. 1 is an SEM photograph of the polymerized iron acetate obtained in example 1, and it can be seen that the polymerized iron acetate shows morphological characteristics of cluster and layer.
FIG. 2 is an infrared spectrum of the polymeric ferric acetate obtained in example 1, and it can be seen that groups such as-OH, Fe-O, C-C and-COO are clearly present in the infrared absorption peak.
The polyferric acetate is used for treating wastewater with the phosphorus concentration of 6 mg/L, the pH value of the wastewater is 7.76, the dosage of a flocculating agent is 24 mg/L, the wastewater is rapidly stirred for 2min at 250r/min and then slowly stirred for 15min at 60r/min, the sedimentation is 20min, the turbidity removal rate is 98.2%, and the phosphorus removal rate is 95.9%.
Example 2
Dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature (15-25 ℃) to obtain a ferrous sulfate solution, wherein the ferrous ion concentration is 1.90 mol/L, sequentially adding glacial acetic acid and potassium chlorate to be uniformly mixed during continuous stirring to obtain a mixed solution, wherein the molar ratio of the ferrous ion to the acetic acid is 1: 4.0, and the molar ratio of the ferric ion to the potassium chlorate is 5.5: 1, then placing the mixed solution in a constant-temperature water bath kettle at 50 ℃ to react for 6 hours, and removing impurity ions to obtain a reddish-brown liquid product polymerized ferric acetate.
The polyferric acetate is used for treating wastewater with the phosphorus concentration of 6 mg/L, the pH value of the wastewater is 7.76, the dosage of a flocculating agent is 24 mg/L, the wastewater is rapidly stirred for 2min at 250r/min and then slowly stirred for 15min at 60r/min, the sedimentation is 20min, the turbidity removal rate is 96.6%, and the phosphorus removal rate is 94.3%.
Example 3
Dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature (15-25 ℃) to obtain a ferrous sulfate solution, wherein the ferrous ion concentration is 1.85 mol/L, sequentially adding glacial acetic acid and potassium chlorate to be uniformly mixed during continuous stirring to obtain a mixed solution, wherein the molar ratio of the ferrous ion to the acetic acid is 1: 4.0, and the molar ratio of the ferric ion to the potassium chlorate is 5.55: 1, then placing the mixed solution in a constant-temperature water bath kettle at the temperature of 70 ℃ to react for 6 hours, and removing impurity ions to obtain a reddish-brown liquid product polymerized ferric acetate.
The polyferric acetate is used for treating wastewater with the phosphorus concentration of 6 mg/L, the pH value of the wastewater is 7.76, the dosage of a flocculating agent is 24 mg/L, the wastewater is rapidly stirred for 2min at 250r/min and then slowly stirred for 15min at 60r/min, the sedimentation is carried out for 20min, the turbidity removal rate is 96%, and the phosphorus removal rate is 93.7%.
Example 4
Dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature (15-25 ℃) to obtain a ferrous sulfate solution, wherein the ferrous ion concentration is 1.82 mol/L, sequentially adding glacial acetic acid and potassium chlorate to be uniformly mixed during continuous stirring to obtain a mixed solution, wherein the molar ratio of the ferrous ion to the acetic acid is 1: 4.0, and the molar ratio of the ferric ion to the potassium chlorate is 5.58: 1, then placing the mixed solution in a constant-temperature water bath kettle at the temperature of 60 ℃ to react for 5 hours, and removing impurity ions to obtain a reddish-brown liquid product polymerized ferric acetate.
The polyferric acetate is used for treating wastewater with the phosphorus concentration of 6 mg/L, the pH value of the wastewater is 7.76, the dosage of a flocculating agent is 24 mg/L, the wastewater is rapidly stirred for 2min at 250r/min and then slowly stirred for 15min at 60r/min, the sedimentation is 20min, the turbidity removal rate is 96.6%, and the phosphorus removal rate is 94.3%.
Example 5
Dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature (15-25 ℃) to obtain a ferrous sulfate solution, wherein the ferrous ion concentration is 1.88 mol/L, sequentially adding glacial acetic acid and potassium chlorate to be uniformly mixed during continuous stirring to obtain a mixed solution, wherein the molar ratio of the ferrous ion to the acetic acid is 1: 4.0, and the molar ratio of the ferric ion to the potassium chlorate is 5.52: 1, then placing the mixed solution in a constant-temperature water bath kettle at the temperature of 60 ℃ to react for 7 hours, and removing impurity ions to obtain a reddish-brown liquid product polymerized ferric acetate.
The polyferric acetate is used for treating wastewater with the phosphorus concentration of 6 mg/L, the pH value of the wastewater is 7.76, the dosage of a flocculating agent is 24 mg/L, the wastewater is rapidly stirred for 2min at 250r/min and then slowly stirred for 15min at 60r/min, the sedimentation is 20min, the turbidity removal rate is 96.4%, and the phosphorus removal rate is 94.1%.
Example 6
Dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature (15-25 ℃) to obtain a ferrous sulfate solution, wherein the ferrous ion concentration is 1.84 mol/L, sequentially adding glacial acetic acid and potassium chlorate to be uniformly mixed during continuous stirring to obtain a mixed solution, wherein the molar ratio of the ferrous ion to the acetic acid is 1: 3.5, and the molar ratio of the ferric ion to the potassium chlorate is 5.56: 1, then placing the mixed solution in a constant-temperature water bath kettle at the temperature of 60 ℃ to react for 6 hours, and removing impurity ions to obtain a reddish-brown liquid product polymerized ferric acetate.
The polyferric acetate is used for treating wastewater with the phosphorus concentration of 6 mg/L, the pH value of the wastewater is 7.76, the dosage of a flocculating agent is 24 mg/L, the wastewater is rapidly stirred for 2min at 250r/min and then slowly stirred for 15min at 60r/min, the sedimentation is 20min, the turbidity removal rate is 97.3%, and the phosphorus removal rate is 95%.
Example 7
Dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature (15-25 ℃) to obtain a ferrous sulfate solution, wherein the ferrous ion concentration is 1.86 mol/L, sequentially adding glacial acetic acid and potassium chlorate to be uniformly mixed during continuous stirring to obtain a mixed solution, wherein the molar ratio of the ferrous ion to the acetic acid is 1: 4.5, and the molar ratio of the ferric ion to the potassium chlorate is 5.54: 1, then placing the mixed solution in a constant-temperature water bath kettle at the temperature of 60 ℃ to react for 6 hours, and removing impurity ions to obtain a reddish-brown liquid product polymerized ferric acetate.
The polyferric acetate is used for treating wastewater with the phosphorus concentration of 6 mg/L, the pH value of the wastewater is 7.76, the dosage of a flocculating agent is 24 mg/L, the wastewater is rapidly stirred for 2min at 250r/min and then slowly stirred for 15min at 60r/min, the sedimentation is 20min, the turbidity removal rate is 96.6%, and the phosphorus removal rate is 94.3%.
Example 8
Dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature (15-25 ℃) to obtain a ferrous sulfate solution, wherein the ferrous ion concentration is 1.85 mol/L, sequentially adding glacial acetic acid and potassium chlorate to be uniformly mixed during continuous stirring to obtain a mixed solution, wherein the molar ratio of the ferrous ion to the acetic acid is 1: 4.0, and the molar ratio of the ferric ion to the potassium chlorate is 5.55: 1, then placing the mixed solution in a constant-temperature water bath kettle at the temperature of 60 ℃ to react for 6 hours, and removing impurity ions to obtain a reddish-brown liquid product polymerized ferric acetate.
The polyferric acetate is used for treating wastewater with the phosphorus concentration of 6 mg/L, the pH value of the wastewater is 7.76, the dosage of the flocculating agent is 24 mg/L, the wastewater is rapidly stirred for 2min at 250r/min and then slowly stirred for 15min at 60r/min, the settling time is 50min, the turbidity removal rate is 95.9 percent, and the phosphorus removal rate is 94.2 percent (see the result in FIG. 6)
When wastewater containing phosphorus at a concentration of 6 mg/L was treated with the polymeric ferric acetate obtained in examples 1 to 3, and the turbidity removal rate and phosphorus removal rate were compared, as shown in FIG. 3, it was found that the polymeric ferric acetate obtained in the present invention exhibited the highest turbidity removal rate and phosphorus removal rate at a reaction temperature of 60 ℃ for the same reaction time and the same molar ratio of ferrous ions to acetic acid.
When wastewater containing phosphorus at a concentration of 6 mg/L was treated with the polymeric ferric acetate obtained in examples 1, 4 and 5, and the turbidity removal rate and phosphorus removal rate were compared, as shown in FIG. 4, it was found that the polymeric ferric acetate obtained in the present invention exhibited the highest turbidity removal rate and phosphorus removal rate at the same reaction temperature and molar ratio of ferrous ions to acetic acid, and the reaction time was 6 hours.
When wastewater containing phosphorus at a concentration of 6 mg/L was treated with the polymeric ferric acetate obtained in examples 1, 6 and 7, and the turbidity removal rate and phosphorus removal rate were compared, as shown in FIG. 5, it was found that the polymeric ferric acetate obtained in the present invention exhibited the highest turbidity removal rate and phosphorus removal rate at the same reaction temperature and reaction time when the molar ratio of ferrous ions to acetic acid was 1: 4.
When the wastewater containing phosphorus at a concentration of 6 mg/L was treated with the polymeric ferric acetate obtained in example 8 and the turbidity removal rate and the phosphorus removal rate were compared with each other at different settling times, as shown in FIG. 6, it was found that the increase in the turbidity removal rate was close to 0 as the settling time was increased and the phosphorus removal rate was increased to 99%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The preparation method of the polymeric ferric acetate is characterized by comprising the following steps: dissolving ferrous sulfate or ferrous sulfate heptahydrate in water at room temperature to obtain a ferrous sulfate solution, sequentially adding glacial acetic acid and an oxidant, uniformly mixing to obtain a mixed solution, then carrying out water bath treatment to remove impurity ions to obtain a reddish brown liquid product, and then drying to obtain solid polymerized ferric acetate;
in the mixed solution, the molar ratio of ferrous ions to acetic acid is 1: 3.5 to 4.5; the temperature of the water bath treatment is 50-70 ℃, and the time of the water bath treatment is 5-7 h.
2. The method for preparing polymeric ferric acetate according to claim 1, wherein the concentration of ferrous ions in the ferrous sulfate solution is 1.80-1.90 mol/L.
3. The method for preparing the polymeric ferric acetate according to claim 1, wherein the molar ratio of ferrous ions to the oxidant is 5.5-5.6: 1.
4. the method for preparing polymeric ferric acetate according to claim 1, wherein the oxidant is one or more of potassium chlorate, sodium chlorate and hydrogen peroxide.
5. The method for preparing polymeric ferric acetate according to claim 1, wherein the drying temperature is 48 to 52 ℃.
6. A polymeric ferric acetate, characterized by being produced by the method for producing the polymeric ferric acetate according to any one of claims 1 to 5.
7. The polymeric iron acetate according to claim 6, characterized by having a three-dimensional structure of clusters and layers.
8. Use of the polymeric ferric acetate of claim 6 or 7 for treating wastewater containing phosphorus.
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| CN105271492A (en) * | 2014-07-18 | 2016-01-27 | 重庆市昂多环境治理有限责任公司 | Water purifying treatment agent |
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| CN105271492A (en) * | 2014-07-18 | 2016-01-27 | 重庆市昂多环境治理有限责任公司 | Water purifying treatment agent |
| CN104876200A (en) * | 2015-04-21 | 2015-09-02 | 深圳市世清环保科技有限公司 | Method for recycling phosphorus resource from electroless nickel plating wastewater |
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