CN112108125A - Preparation method of modified longan shell defluorination adsorbent - Google Patents
Preparation method of modified longan shell defluorination adsorbent Download PDFInfo
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- CN112108125A CN112108125A CN202011029165.3A CN202011029165A CN112108125A CN 112108125 A CN112108125 A CN 112108125A CN 202011029165 A CN202011029165 A CN 202011029165A CN 112108125 A CN112108125 A CN 112108125A
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- 235000000235 Euphoria longan Nutrition 0.000 title claims abstract description 86
- 239000003463 adsorbent Substances 0.000 title claims abstract description 43
- 238000006115 defluorination reaction Methods 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 244000139609 Euphoria longan Species 0.000 title 1
- 240000001008 Dimocarpus longan Species 0.000 claims abstract description 85
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 32
- 239000011737 fluorine Substances 0.000 claims abstract description 32
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 22
- 238000001179 sorption measurement Methods 0.000 claims abstract description 19
- 239000000243 solution Substances 0.000 claims abstract description 15
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002244 precipitate Substances 0.000 claims abstract description 14
- 239000012266 salt solution Substances 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 6
- 239000012670 alkaline solution Substances 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 13
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- 238000000703 high-speed centrifugation Methods 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 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 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 239000003929 acidic solution Substances 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 238000003760 magnetic stirring Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 5
- 239000002154 agricultural waste Substances 0.000 abstract description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 6
- 239000002028 Biomass Substances 0.000 description 4
- 239000003651 drinking water Substances 0.000 description 4
- 235000020188 drinking water Nutrition 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 208000004042 dental fluorosis Diseases 0.000 description 3
- 150000002222 fluorine compounds Chemical class 0.000 description 3
- 150000002736 metal compounds Chemical class 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 206010016818 Fluorosis Diseases 0.000 description 2
- -1 aluminum ion Chemical class 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 208000031404 Chromosome Aberrations Diseases 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 210000000349 chromosome Anatomy 0.000 description 1
- 231100000005 chromosome aberration Toxicity 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 210000004698 lymphocyte Anatomy 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
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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
- B01J20/02—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
- B01J20/0248—Compounds of B, Al, Ga, In, Tl
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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
- B01J20/02—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
- B01J20/0281—Sulfates of compounds other than those provided for in B01J20/045
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- 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
- B01J20/0288—Halides of compounds other than those provided for in B01J20/046
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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
- B01J20/02—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
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- 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
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
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- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
- B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
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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
- 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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- Environmental & Geological Engineering (AREA)
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Water Treatment By Sorption (AREA)
Abstract
A preparation method of a modified longan shell defluorination adsorbent belongs to the technical field of water treatment defluorination. The longan shell is used as a raw material, dried and constant-weight longan shells are crushed, put in an acid solution for constant-temperature water bath, and are washed, dried, ground and screened to obtain longan shell powder; placing the longan shell powder in a constant-temperature aluminum salt solution, adding an alkaline solution, adjusting the pH value, simultaneously stirring at a high speed, and then centrifuging at a high speed to obtain a precipitate; and cleaning and drying the precipitate to obtain the modified longan shell fluorine removal adsorbent. The defluorination adsorbent has the advantages of wide raw material source, low price, simple and feasible preparation process, high adsorption capacity, good defluorination effect, easy industrial operation, wide application prospect and capability of providing a new way for resource utilization of agricultural wastes.
Description
Technical Field
The invention relates to a preparation method of a modified longan shell defluorination adsorbent, relates to a preparation method and application of the defluorination adsorbent, and belongs to the technical field of water treatment defluorination.
Background
Fluorine element widely exists in nature, and an underground fluorine-containing rock stratum is influenced by hydrogeological conditions, so that fluorine-containing silicate ores are dissolved in underground water, and the fluorine content of the underground water is increased. The distribution range of high-fluorine underground water in China is wide, fluorosis disease areas almost spread all over the country, and fluorine-containing underground water serving as a drinking water source also commonly exists. In addition, some surface water sources also have the problems of higher fluorine content and even over-standard fluorine concentration in different degrees.
With the development of society and industry, fluorine pollution of different degrees can be generated in life and industrial production, a large amount of soluble and insoluble fluorides enter a water environment due to the discharge of fluoride-containing wastewater, the content of the fluorides in the water is increased, and the problem that the fluorides in a water body of a local area exceed the standard can be caused. The long-term drinking of water with over-standard fluorine content can seriously affect the human health. In China, a plurality of areas with high dental fluorosis and fluorosis diseases exist, and the fluoride can also cause the phenomena of human and animal lymphocyte chromosome aberration, chromosome exchange, micronucleus formation rate increase and the like. The rural economic conditions of China are relatively lagged behind, the situation that the fluoride of drinking water exceeds the standard is serious, and the problem that the fluoride of drinking water exceeds the standard in high-fluorine areas and rural areas of China needs to be solved urgently.
The method for removing fluoride in water at home and abroad mainly comprises an adsorption method, a chemical precipitation method, a membrane filtration method and the like, wherein the adsorption method has the characteristics of wide adsorbent source, good effect, simple process and the like and is widely applied. Activated alumina is mostly adopted as a defluorination adsorbing material in domestic and foreign applications, but the activated alumina adsorbent has the problems of low adsorption capacity, high influence of pH value, aluminum ion leakage and the like, and the application of the activated alumina in the aspect of water treatment defluorination is limited. In recent years, research and development and application of biomass adsorption materials are highly concerned by the industry, and preparation and research of defluorination adsorbents with wide raw material sources, low cost, environmental friendliness and strong adsorption capacity are important research directions in the future.
The longan shell is common biomass waste in daily life, is generally treated as household garbage or agricultural waste, and is low in recovery and development utilization rate. The longan shell is used as the raw material to prepare the high-energy defluorination adsorbent, which not only can be applied to the field of defluorination of drinking water, but also is a new way for resource utilization of agricultural wastes.
Disclosure of Invention
The invention provides a preparation method of a defluorination adsorbent, which aims at solving the main technical problems of lower saturated adsorption capacity, high preparation cost and poorer defluorination effect of the traditional adsorbent.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a modified longan shell fluorine removal adsorbent comprises the following steps:
(1) putting the dried and constant-weight longan shells into a grinder to be ground for 5-10 min, putting the obtained ground longan shells into an acid solution at 50-80 ℃ for constant-temperature water bath for 4h, then washing the longan shells with deionized water, putting the longan shells into an oven at 50-80 ℃ to be dried for 12h, and then grinding and screening the longan shells to obtain longan shell powder;
(2) preparing an aluminum salt aqueous solution with a certain concentration, placing the aluminum salt aqueous solution in a constant-temperature water bath of 50-80 ℃ magnetically stirred at 200-300 r/min, adding longan shell powder into the aluminum salt solution, adding an alkaline solution under the stirring condition of 1000-2000 r/min after 5-10 min, adjusting the pH value of the mixed solution to 7.0, continuously stirring at the rotating speed of 1000-2500 r/min for 10-20 min, and then obtaining a modified longan shell powder precipitate through high-speed centrifugation;
(3) and drying the modified longan shell powder precipitate for 12h at the constant temperature of 50-80 ℃, cleaning the dried modified longan shell powder precipitate with deionized water, and drying the washed modified longan shell powder precipitate at the constant temperature of 50-80 ℃ to obtain the modified longan shell defluorination adsorbent.
The acidic solution in the step (1) can be strong acid solution such as hydrochloric acid, sulfuric acid, nitric acid and the like, and the concentration is 0.01-0.20 mol/L.
The amount of the constant-weight longan shells added into the aluminum salt solution in the step (2) is as follows: every 10g of longan shell powder corresponds to 100-200 mL of aluminum salt solution.
The aluminum salt solution in the step (2) can be aluminum sulfate, aluminum nitrate, aluminum trichloride and other solutions, and the concentration is 0.10-0.50 mol/L.
The alkaline solution in the step (2) can be strong alkali solution such as sodium hydroxide, potassium hydroxide, calcium hydroxide and the like, and the concentration is 0.01-0.10 mol/L.
The method is used for adsorbing fluorine in water, and the pH value of the water solution is 5-9.
The invention has the beneficial effects that:
the invention uses the waste longan shell as the raw material to prepare the defluorination adsorbent with good adsorption performance. The adsorbent is composed of a biomass material and a metal compound, and the characteristic that the biomass material and the metal compound adsorb fluorine ions in water is fully utilized. Compared with the traditional defluorination adsorbent, the adsorbent has the characteristics of low preparation cost, high adsorption performance and good defluorination effect.
Drawings
FIG. 1 is an X-ray diffraction diagram of the longan shell and modified longan shell defluorination adsorbent in example 1;
FIG. 2 is a scanning electron microscope image of the longan shell and modified longan shell fluorine-removing adsorbent in example 1;
FIG. 3 is a graph showing the adsorption efficiency of fluorine-containing water of the longan shell and the modified longan shell defluorination adsorbent in example 1;
fig. 4 is a graph of the adsorption efficiency of the modified longan shell fluorine removal adsorbent of example 1 under different pH conditions.
Detailed Description
The present invention will be described in detail below with reference to examples to enable those skilled in the art to better understand the present invention, but the present invention is not limited to the examples.
Example 1
Putting the dried and constant-weight longan shells into a grinder to be ground for 10min, putting the obtained ground longan shells into a 0.02mol/L strong acid solution at 60 ℃ for constant-temperature water bath for 4h, then washing the longan shells with deionized water, putting the longan shells into a 70 ℃ oven to be dried for 12h, and then grinding and screening the longan shells to obtain longan shell powder. Preparing 0.35mol/L aluminum chloride solution, placing the solution in a 60 ℃ constant temperature water bath magnetically stirred at 300r/min, adding 5g of longan shell powder into 100mL of aluminum salt solution, adding 0.1mol/L strong base solution under the stirring condition of 2000r/min after 10min, adjusting the pH value of the mixed solution to 7.0, continuously stirring at 2000r/min for 20min, and then obtaining modified longan shell powder precipitate through high-speed centrifugation. Drying the modified longan shell powder precipitate for 12h at the constant temperature of 70 ℃, cleaning the dried modified longan shell powder precipitate by using deionized water, and drying the washed modified longan shell powder precipitate at the constant temperature of 70 ℃ to obtain the modified longan shell defluorination adsorbent.
Fig. 1 and fig. 2 show the characterization results of the longan shell and modified longan shell fluorine removal adsorbent by using X-ray diffraction and scanning electron microscope. The X-ray diffraction pattern shows that the longan shell presents a sharp diffraction peak, the intensity of the diffraction peak of the modified longan shell fluorine removal adsorbent is obviously weakened and widened to a certain extent, and the surface is converted from a crystalline state to an amorphous state; the scanning electron microscope picture shows that the surface of the longan shell is smooth, the surface of the modified longan shell fluorine-removing adsorbent is covered by rough particles, and the generation of metal compounds is indicated; compared with longan shells, the modified longan shell fluorine removal adsorbent has more active adsorption sites on the surface.
The longan shell in example 1 is used as a comparative example, and the fluorine-containing water adsorption performance of the modified longan shell fluorine-removing adsorbent and the longan shell prepared by the invention is detected. Static defluorination experiments were carried out using an aqueous solution containing fluorine at a concentration of 4.76mg/L as an example: 100mg of the modified longan shell fluorine-removing adsorbent and longan shell were respectively added into 100mL of fluorine-containing solution, the pH of the solution was 7.32, and the fluorine ion concentration of water was measured after static adsorption for 120min at room temperature, and the results are shown in FIG. 3. Compared with longan shells, the modified longan shell fluorine removal adsorbent has good fluorine adsorption effect and high adsorption capacity.
In order to verify the pH value adaptive range of the modified longan shell defluorination adsorbent, 100mg of the modified longan shell defluorination adsorbent is respectively added into 100mL of fluorine-containing water with pH values of 5.0, 7.0 and 9.0 and concentration of 10mg/L, and the fluorine content in the water is measured after static adsorption for 120min at room temperature, and the results are shown in Table 1 and attached figure 4. The data in the table 1 show that the modified longan shell fluorine removal adsorbent prepared by the invention can be directly used in practical water with wide pH value, has good fluorine removal effect and good application prospect.
TABLE 1 adsorption efficiency of modified longan Shell defluorination adsorbents
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (7)
1. The preparation method of the modified longan shell defluorination adsorbent is characterized by comprising the following steps:
(1) putting the dried and constant-weight longan shells into a grinder to be ground for 5-10 min, putting the obtained ground longan shells into an acid solution at 50-80 ℃ for constant-temperature water bath for 4h, then washing the longan shells with deionized water, putting the longan shells into an oven at 50-80 ℃ to be dried for 12h, and then grinding and screening the longan shells to obtain longan shell powder;
(2) preparing an aluminum salt aqueous solution with a certain concentration, placing the aluminum salt aqueous solution in a constant-temperature water bath with a temperature of 50-80 ℃ and magnetic stirring at 200-300 r/min, adding the constant-weight longan shell powder into the aluminum salt solution, adding an alkaline solution under the stirring condition of 1000-2000 r/min after 5-10 min, adjusting the pH value of the mixed solution to 7.0, continuously stirring at a rotating speed of 1000-2500 r/min for 10-20 min, and then performing high-speed centrifugation to obtain a modified longan shell powder precipitate;
(3) and drying the modified longan shell powder precipitate for 12h at the constant temperature of 50-80 ℃, cleaning the dried modified longan shell powder precipitate with deionized water, and drying the washed modified longan shell powder precipitate at the constant temperature of 50-80 ℃ to obtain the modified longan shell defluorination adsorbent.
2. The method for preparing the modified longan shell defluorination adsorbent according to claim 1, wherein the acidic solution in the step (1) can be strong acid solution such as hydrochloric acid, sulfuric acid and nitric acid, and the concentration is 0.01-0.20 mol/L.
3. The method for preparing the modified longan shell fluorine-removing adsorbent according to claim 1, wherein the amount of the constant-weight longan shell added to the aluminum salt solution in the step (2) is 100-200 mL of the aluminum salt solution per 10g of the longan shell powder.
4. The method for preparing the modified longan shell defluorination adsorbent as claimed in claim 1, wherein the aluminum salt solution in step (2) can be aluminum sulfate, aluminum nitrate, aluminum trichloride, etc., and the concentration is 0.10-0.50 mol/L.
5. The preparation method of the modified longan shell defluorination adsorbent as claimed in claim 1, wherein the alkaline solution in the step (2) is strong alkali solution such as sodium hydroxide, potassium hydroxide and calcium hydroxide, and the concentration is 0.01-0.10 mol/L.
6. The modified longan shell fluorine removal adsorbent prepared by the method of any one of claims 1 to 5.
7. The application of the modified longan shell fluorine removal adsorbent prepared by the method of any one of claims 1-5 in the adsorption of fluorine in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011029165.3A CN112108125A (en) | 2020-09-25 | 2020-09-25 | Preparation method of modified longan shell defluorination adsorbent |
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| CN111389347A (en) * | 2020-04-09 | 2020-07-10 | 中国铝业股份有限公司 | Wastewater defluorination adsorbent and preparation method thereof |
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| CN105080499A (en) * | 2015-05-18 | 2015-11-25 | 江苏大学 | Methylene blue dye adsorbent and preparation and application method thereof |
| CN111389347A (en) * | 2020-04-09 | 2020-07-10 | 中国铝业股份有限公司 | Wastewater defluorination adsorbent and preparation method thereof |
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