CN114100585A - Defluorinating agent for drinking water - Google Patents
Defluorinating agent for drinking water Download PDFInfo
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- CN114100585A CN114100585A CN202010871003.8A CN202010871003A CN114100585A CN 114100585 A CN114100585 A CN 114100585A CN 202010871003 A CN202010871003 A CN 202010871003A CN 114100585 A CN114100585 A CN 114100585A
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- sodium alginate
- fluorine
- bentonite
- solution
- distilled water
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 19
- 239000003651 drinking water Substances 0.000 title claims abstract description 10
- 235000020188 drinking water Nutrition 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000003463 adsorbent Substances 0.000 claims abstract description 28
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 28
- 239000000661 sodium alginate Substances 0.000 claims abstract description 28
- 239000012153 distilled water Substances 0.000 claims abstract description 19
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000243 solution Substances 0.000 claims abstract description 18
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 17
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 17
- 239000000725 suspension Substances 0.000 claims abstract description 15
- 239000000440 bentonite Substances 0.000 claims abstract description 12
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 12
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 12
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 9
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000011259 mixed solution Substances 0.000 claims abstract description 7
- 150000003839 salts Chemical class 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 abstract description 55
- 229910052731 fluorine Inorganic materials 0.000 abstract description 55
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 52
- 239000000463 material Substances 0.000 abstract description 20
- 238000001179 sorption measurement Methods 0.000 abstract description 18
- 238000006115 defluorination reaction Methods 0.000 abstract description 9
- -1 fluorine ions Chemical class 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 13
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 229910052761 rare earth metal Inorganic materials 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 208000004042 dental fluorosis Diseases 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000000706 filtrate Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 206010016818 Fluorosis Diseases 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000037406 food intake Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- JAQXDZTWVWLKGC-UHFFFAOYSA-N [O-2].[Al+3].[Fe+2] Chemical compound [O-2].[Al+3].[Fe+2] JAQXDZTWVWLKGC-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052586 apatite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000012631 food intake Nutrition 0.000 description 1
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 210000000653 nervous system Anatomy 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Classifications
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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
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
-
- 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
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
- B01J20/0296—Nitrates of compounds other than those provided for in B01J20/04
-
- 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
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
-
- 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
- B01J20/28016—Particle form
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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
- B01J20/28—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
- B01J20/28047—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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
-
- 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
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing compounds
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a defluorination agent in drinking water, which comprises a sodium alginate solution, 2-4 g of bentonite, 0.05-0.10 mol of ferric nitrate, 0.05-0.10 mol of aluminum nitrate and distilled water. According to the invention, the bentonite-sodium alginate suspension is dropwise added into the mixed solution of ferric salt and aluminum salt, and the gel ball adsorbent is obtained through filtering and washing, so that the prepared gel ball adsorbent can efficiently remove fluorine, is easy to separate, the price of the raw materials for preparation is low, the cost is low, the adsorption capacity can be enhanced, the solid-liquid separation is easy, and Fe and Al are introduced into the material, so that the adsorption capacity of the fluorine removing agent on fluorine ions in water is further improved.
Description
Technical Field
The invention relates to the field of life, in particular to a defluorinating agent for drinking water.
Background
The fluorine necessary for human body is usually from food intake, however, long-term drinking of high fluorine water is the main cause of fluorosis, and the absorption rate of fluoride in drinking water can reach 90%. A significant positive correlation between fluorosis and fluorine uptake is reported. Prolonged ingestion of excess fluorine can result in its deposition on teeth and bone, which in turn can lead to dental fluorosis and fluorosis. The ingestion of high levels of fluorine can also be harmful to the nervous system of the human body.
The fluorine removal method of the existing drinking water has a plurality of types, and can be divided into treatment methods such as precipitation, ion exchange, electrochemistry, membrane technology, adsorption and the like according to different fluorine removal mechanisms. The adsorption method has the advantages of good fluorine removal effect, low cost, simple operation, wide source of the adsorbent and the like, and is an effective fluorine removal method.
In the aspect of fluorine-containing water treatment, the adsorption method has the advantages of good fluorine removal effect, low cost, simple operation, wide source of the adsorbent and the like, and is considered to be a fluorine removal method more suitable for being applied in remote rural areas in China. At present, the commonly used adsorbents mainly include alumina, molecular sieves, bone charcoal, hydroxyapatite, ion exchange resin and the like.
In recent years, many of the adsorption fluorine removal materials mainly comprise nano-scale particles. Sundaram et al, Kemer et al, Maliyekkal et al, and Bhaumik et al, respectively, used nanoscale materials such as apatite, nano-magnetite, carbon nanotubes, and polymeric nano-ferroferric oxide as adsorbents to investigate their fluoride adsorption performance. As a result, it has been found that these nanoscale adsorbent materials have relatively good fluorine adsorption and removal effects, but the adsorbent materials are difficult to separate in an aqueous solution, and a solid-liquid separation device needs to be added in a subsequent process. This not only increases the equipment cost and maintenance cost for fluorine-containing water treatment, but also increases the difficulty of process design. Therefore, it is considered that the nano-scale powdered adsorbent material is not economical for practical use.
The adsorbing material such as rare earth element material has good fluorine adsorbing and removing effect, but the material cost is high, the material is not economical in practical utilization, and the practical operability for treating fluorine-containing water in poor China areas is not high. For example, Liu et al have conducted a fluorine removal experiment using a rare earth element-modified material as an adsorbent, and as a result, have shown that the adsorbent has an adsorption fluorine removal capacity of 178 mg/L. Although the fluorine removal effect is good, the rare earth elements are very expensive in cost and high in recycling cost, so that the rare earth element materials are generally researched and used in a laboratory range and cannot be widely applied to an actual fluorine-containing water treatment process.
The fluorine removal performance of the adsorption material with economical efficiency, such as bone charcoal, bentonite, porous ceramsite, zeolite and the like, has been studied, but the result shows that the fluorine removal effect is not ideal. For example, the fluorine removal adsorption capacity of lanthanum and aluminum modified clay is 1.3033mg/g, the fluorine removal adsorption capacity of bone charcoal is 3.33mg/g, the fluorine removal adsorption capacity of acid-treated bentonite is only 0.094mg/g, and the fluorine removal adsorption capacity of iron-aluminum oxide impregnated porous ceramsite is 1.7 mg/g.
In addition, the studied defluorination adsorbent has poor adaptability to the environment and is sensitive to the influence of the pH, the temperature and coexisting ions of the water body. Kumar et al and Zhu et al have conducted adsorption defluorination studies using water and materials such as iron hydroxide particles and magnesium-modified silica particles, respectively, as adsorbents. As a result, the adsorbent has a good fluorine removal effect only when the initial pH of the solution is 5.0-7.0. In addition, the defluorination effect of such materials is also greatly influenced by the coexisting ions in the solution. However, the initial pH range of practical high fluorine water, especially industrial wastewater, varies greatly and different coexisting ions exist, and thus, such adsorbents are limited in the process of practical application.
In the prior art, the nano-scale powder fluorine removal material is difficult to separate in an aqueous solution, and solid-liquid separation equipment is required to be added in the subsequent process. The equipment cost and the maintenance cost of fluorine-containing water treatment are increased, the difficulty of process design is also increased, the rare earth fluorine removal material has a good fluorine removal effect, but the rare earth elements have very high cost and high recycling cost, and the fluorine removal materials such as bone charcoal, bentonite, porous ceramsite, zeolite and the like have low fluorine removal performance and do not have application value.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a defluorinating agent for drinking water.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention relates to a defluorination agent for drinking water, which comprises sodium alginate solution, 2-4 g of bentonite, 0.05-0.10 mol of ferric nitrate, 0.05-0.10 mol of aluminum nitrate and distilled water.
As a preferred technical scheme of the invention, the method specifically comprises the following steps:
a. putting the sodium alginate solution into a reaction container, heating the sodium alginate solution to 70-80 ℃ at a stirring speed of 150r/min, and keeping the time for 3-4 hours;
b. adding 2-4 g of bentonite into the sodium alginate solution in the step a, heating to 40-50 ℃ at a stirring speed of 150r/min, and stirring for 1-2 hours to form a suspension;
c. dropwise adding the mixed solution of ferric salt and aluminum salt into the suspension liquid in the volume of 2 by using a constant-pressure dropping funnel, stirring for 3-4 h at the same time at 50r/min, and filtering and washing to obtain a gel ball adsorbent;
d. in the step c, 0.05mol to 0.10mol of ferric nitrate and 0.05mol to 0.10mol of aluminum nitrate are added into 200ml of distilled water and stirred to be dissolved, and a mixed solution of ferric salt and aluminum salt is prepared;
e. in the step a, 2g to 4g of sodium alginate is added into 500ml of distilled water to be stirred and dissolved, and then sodium alginate solution is prepared.
Compared with the prior art, the invention has the following beneficial effects:
1: according to the invention, the bentonite-sodium alginate suspension is dropwise added into the mixed solution of ferric salt and aluminum salt, and the gel ball adsorbent is obtained through filtering and washing. The introduction of Fe and Al into the material aims to further improve the adsorption capacity of the fluorine removal agent on fluorine ions in water.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Example 1
Preparing a fluorine removing agent: adding 2g of sodium alginate into 500ml of distilled water, and stirring for 3 hours at 70 ℃; then adding 2g of bentonite, and stirring for 1h at 40 ℃ to form bentonite-sodium alginate suspension;
adding 0.05mol of ferric nitrate and 0.05mol of aluminum nitrate into 200ml of distilled water, dropwise adding bentonite-sodium alginate suspension into the distilled water by using a constant-pressure dropping funnel, stirring the mixture for 3 hours, and filtering and washing the mixture to obtain the gel ball adsorbent.
Evaluation test of defluorination agent: 0.7g of adsorbent was added to 100mL of 10mg/L fluorine-containing solution and magnetically stirred for 3 hours. Subsequently, the mixture was filtered, and the obtained filtrate was measured for the fluoride ion concentration with a fluoride ion meter. The results show that the fluorine content is reduced to 0.35 mg/L.
Example 2
Preparing a fluorine removing agent: adding 3g of sodium alginate into 500ml of distilled water, and stirring for 4 hours at 80 ℃; then 3g of bentonite is added, and the mixture is stirred for 2 hours at the temperature of 50 ℃ to form bentonite-sodium alginate suspension;
adding 0.10mol of ferric nitrate and 0.05mol of aluminum nitrate into 200ml of distilled water, dropwise adding bentonite-sodium alginate suspension into the distilled water by using a constant-pressure dropping funnel, stirring the mixture for 4 hours, and filtering and washing the mixture to obtain the gel ball adsorbent.
Evaluation test of defluorination agent: 0.7g of adsorbent was added to 100mL of 10mg/L fluorine-containing solution and magnetically stirred for 3 hours. Subsequently, the mixture was filtered, and the obtained filtrate was measured for the fluoride ion concentration with a fluoride ion meter. The results show that the fluorine content is reduced to 0.38 mg/L.
Example 3
Preparing a fluorine removing agent: adding 3g of sodium alginate into 500ml of distilled water, and stirring for 4 hours at 80 ℃; then 3g of bentonite is added, and the mixture is stirred for 2 hours at the temperature of 50 ℃ to form bentonite-sodium alginate suspension;
adding 0.10mol of ferric nitrate and 0.05mol of aluminum nitrate into 200ml of distilled water, dropwise adding bentonite-sodium alginate suspension into the distilled water by using a constant-pressure dropping funnel, stirring the mixture for 4 hours, and filtering and washing the mixture to obtain the gel ball adsorbent.
Evaluation test of defluorination agent: 0.7g of adsorbent was added to 100mL of 10mg/L fluorine-containing solution, adjusted to pH 8 with 0.1mol/L sodium hydroxide, and magnetically stirred for 3 hours. Subsequently, the mixture was filtered, and the obtained filtrate was measured for the fluoride ion concentration with a fluoride ion meter. The results show that the fluorine content is reduced to 0.45mg/L
Example 4
Preparing a fluorine removing agent: adding 3g of sodium alginate into 500ml of distilled water, and stirring for 4 hours at 80 ℃; then 3g of bentonite is added, and the mixture is stirred for 2 hours at the temperature of 50 ℃ to form bentonite-sodium alginate suspension;
adding 0.10mol of ferric nitrate and 0.05mol of aluminum nitrate into 200ml of distilled water, dropwise adding bentonite-sodium alginate suspension into the distilled water by using a constant-pressure dropping funnel, stirring the mixture for 4 hours, and filtering and washing the mixture to obtain the gel ball adsorbent.
Evaluation test of defluorination agent: 0.7g of adsorbent was added to 100mL of 10mg/L fluorine-containing solution, while 0.16g of sodium chloride was added, and magnetically stirred for 3 hours. Subsequently, the mixture was filtered, and the obtained filtrate was measured for the fluoride ion concentration with a fluoride ion meter. The results show that the fluorine content is reduced to 0.65 mg/L.
According to the invention, the bentonite-sodium alginate suspension is dropwise added into the mixed solution of ferric salt and aluminum salt, and the gel ball adsorbent is obtained through filtering and washing, so that the prepared gel ball adsorbent can efficiently remove fluorine, is easy to separate, the price of the raw materials for preparation is low, the cost is low, the adsorption capacity can be enhanced, the solid-liquid separation is easy, and Fe and Al are introduced into the material, so that the adsorption capacity of the fluorine removing agent on fluorine ions in water is further improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A defluorinating agent for drinking water is characterized by comprising a sodium alginate solution, 2-4 g of bentonite, 0.05-0.10 mol of ferric nitrate, 0.05-0.10 mol of aluminum nitrate and distilled water.
2. The drinking water defluorinating agent as set forth in claim 1, which comprises the following steps:
a. putting the sodium alginate solution into a reaction container, heating the sodium alginate solution to 70-80 ℃ at a stirring speed of 150r/min, and keeping the time for 3-4 hours;
b. adding 2-4 g of bentonite into the sodium alginate solution in the step a, heating to 40-50 ℃ at a stirring speed of 150r/min, and stirring for 1-2 hours to form a suspension;
c. dropwise adding the mixed solution of ferric salt and aluminum salt into the suspension solution in the volume of 2 by using a constant-pressure dropping funnel, stirring for 3-4 h at the same time of 50r/min, and filtering and washing to obtain a gel ball adsorbent;
d. in the step c, 0.05mol to 0.10mol of ferric nitrate and 0.05mol to 0.10mol of aluminum nitrate are added into 200ml of distilled water and stirred to be dissolved, and a mixed solution of ferric salt and aluminum salt is prepared;
e. in the step a, 2g to 4g of sodium alginate is added into 500ml of distilled water to be stirred and dissolved, and then sodium alginate solution is prepared.
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| CN202010871003.8A CN114100585A (en) | 2020-08-26 | 2020-08-26 | Defluorinating agent for drinking water |
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| CN111569818A (en) * | 2020-05-06 | 2020-08-25 | 三峡大学 | Drinking water defluorinating agent and preparation method and application thereof |
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| JP2003260472A (en) * | 2002-03-12 | 2003-09-16 | Kurita Water Ind Ltd | Treatment method for fluorine-containing water |
| CN1883787A (en) * | 2006-05-19 | 2006-12-27 | 浙江大学 | Process for polyvinyl alcohol embedding preparation of spherical bentonite |
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