CN104801265A - Calcium silicate used for dephosphorization of water bodies and preparation method - Google Patents
Calcium silicate used for dephosphorization of water bodies and preparation method Download PDFInfo
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- CN104801265A CN104801265A CN201510160158.XA CN201510160158A CN104801265A CN 104801265 A CN104801265 A CN 104801265A CN 201510160158 A CN201510160158 A CN 201510160158A CN 104801265 A CN104801265 A CN 104801265A
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- calcium silicates
- calcium silicate
- dephosphorization
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Abstract
The invention particularly relates to calcium silicate used for dephosphorization of water bodies and a preparation method. The calcium silicate used for dephosphorization of water bodies is composed of nanowires, nanowires are connected with one another through irregular nodes or sheet surfaces to form a three-dimensional labyrinth structure and the general molecular formula of calcium silicate is CaxSiO(x+2). The preparation method for calcium silicate used for dephosphorization of water bodies comprises the following steps: (1), mixing silicon oxide, calcium hydroxide, magnesium hydrate and water according to a molar ratio to form seriflux; (2), carrying out hydrothermal reaction on the seriflux for 2-3 h, aging, cooling and carrying out liquid-solid separation so as to obtain solid calcium silicate; (3), dying solid calcium silicate so as to obtain calcium silicate used for dephosphorization of water bodies. The calcium silicate used for dephosphorization of water bodies and the preparation method, disclosed by the invention, have the benefits as follows: (1), the preparation process is simple; (2), the specific area of calcium silicate is large, phosphorus adsorption is high and calcium silicate is very suitable for efficient removal of phosphorus in water bodies.
Description
Technical field
The invention belongs to Inorganic synthese technical field, be specifically related to a kind of calcium silicates for water body dephosphorization and preparation method.
Background technology
Body eutrophication (eutrophication) refers to because the elements such as a large amount of nitrogen, phosphorus, potassium are drained into the surface water body that flow velocity is slow, the update cycle is long, make the aquatiles such as algae growth and breeding in large quantities, the speed that organic matter is produced is considerably beyond depletion rate, in water body, organic matter savings, destroys the process of aquatic ecological balance.
How to remove P elements in water body and perplex environmentalist always, researcher develops a series of phosphorus and removes material, comprising calcium silicates.Chinese patent application (application number: CN201310647958) discloses a kind of modification calcium silicates and the application in sewage dephosphorization thereof, wherein describes a kind of preparation method of calcium silicates, the calcium silicates particle diameter that the method obtains less than 60 microns.
Calcium silicates exists with wollastonite form at occurring in nature, also synthesize by manual method, the calcium silicates that existing method obtains is powder or laminated structure normally, these structures are when using as phosphorus sorbing material, be difficult to because specific area is less play maximum exchange capacity, the utilization rate of calcium silicates is greatly reduced.
Summary of the invention
Goal of the invention: the present invention is directed to above-mentioned prior art Problems existing and make improvement, namely first object of the present invention is open a kind of calcium silicates for water body dephosphorization.Second object of the present invention is the preparation method of openly a kind of calcium silicates for water body dephosphorization.
Technical scheme: a kind of calcium silicates for water body dephosphorization, is made up of nano wire, is interconnected to constitute three-dimensional labyrinth structure by random node or sheet face between nano wire; Diameter 5 ~ 10 nanometer of nano wire, nanowire length 100 ~ 300 nanometer, its general molecular formula is Ca
xsiO
x+2, 0.5≤x≤0.9.
As a kind of in the present invention a kind of preferred version of the calcium silicates for water body dephosphorization, the BET specific surface area of described calcium silicates is 300 ~ 600m
2/ g.
For a preparation method for the calcium silicates of water body dephosphorization, comprise the following steps:
(1) by silica, calcium hydroxide, magnesium hydroxide, water according to molar ratio 1:(0.5 ~ 0.9): (0.0001 ~ 0.0005): (20 ~ 100) are mixed to form slurries;
(2), the slurries in step (1) are reacted 2 ~ 3 hours under 180 ~ 220 DEG C of hydrothermal conditions after, then 130 ~ 150 DEG C of ageings 10 ~ 20 hours, after cooling, solid-liquor separation obtains solid-state calcium silicates;
(3), will the solid-state calcium silicates that obtain in step (2) dry 1 ~ 10h at 90 ~ 120 DEG C, namely obtain the calcium silicates for water body dephosphorization.
A kind of preferred version as a kind of in the present invention preparation method of the calcium silicates for water body dephosphorization: the silica in step (1) is selected from the silica adopting liquid-phase precipitation method to obtain.
Beneficial effect: the invention discloses a kind of calcium silicates for water body dephosphorization and preparation method has following beneficial effect:
(1), preparation technology is simple;
(2), the specific area of calcium silicates is large, and phosphorus adsorbance is high, is suitable as very much the efficient removal of phosphorus in water body.
Accompanying drawing explanation
Fig. 1 is the SEM figure of the obtained calcium silicates of specific embodiment 4;
Fig. 2 is the SEM figure of the obtained calcium silicates of specific embodiment 5.
Detailed description of the invention
Below the specific embodiment of the present invention is described in detail.
Specific embodiment 1
For a calcium silicates for water body dephosphorization, be made up of nano wire, between nano wire, be interconnected to constitute three-dimensional labyrinth structure by random node or sheet face; Diameter 5 nanometer of nano wire, nanowire length 100 nanometer, its molecule leads to for Ca
0.5siO
2.5.
In the present embodiment, the BET specific surface area of calcium silicates is 300m
2/ g.
For a preparation method for the calcium silicates of water body dephosphorization, comprise the following steps:
(1) silica, calcium hydroxide, magnesium hydroxide, water are mixed to form slurries according to molar ratio 1:0.5:0.0001:20;
(2), the slurries in step (1) are reacted 2 hours under 180 DEG C of hydrothermal conditions after, then 130 DEG C of ageings 20 hours, after cooling, solid-liquor separation obtains solid-state calcium silicates;
(3), solid-state calcium silicates dry 10h at 90 DEG C of will obtaining in step (2), namely obtain the calcium silicates for water body dephosphorization.
In the present embodiment, the silica in step (1) is selected from the silica adopting liquid-phase precipitation method to obtain, such as precipitated silica (trade name: precipitation method White Carbon black).
Specific embodiment 2
For a calcium silicates for water body dephosphorization, be made up of nano wire, between nano wire, be interconnected to constitute three-dimensional labyrinth structure by random node or sheet face; Diameter 10 nanometer of nano wire, nanowire length 300 nanometer, its molecular formula is Ca
0.9siO
2.9.
In the present embodiment, the BET specific surface area of calcium silicates is 600m
2/ g.
For a preparation method for the calcium silicates of water body dephosphorization, comprise the following steps:
(1) silica, calcium hydroxide, magnesium hydroxide, water are mixed to form slurries according to molar ratio 1:0.9:0.0005:100;
(2), the slurries in step (1) are reacted 3 hours under 220 DEG C of hydrothermal conditions after, then 150 DEG C of ageings 10 hours, after cooling, solid-liquor separation obtains solid-state calcium silicates;
(3), solid-state calcium silicates dry 1h at 120 DEG C of will obtaining in step (2), namely obtain the calcium silicates for water body dephosphorization.
In the present embodiment, the silica in step (1) is selected from the silica adopting liquid-phase precipitation method to obtain, such as precipitated silica (trade name: precipitation method White Carbon black).
Specific embodiment 3
For a calcium silicates for water body dephosphorization, be made up of nano wire, between nano wire, be interconnected to constitute three-dimensional labyrinth structure by random node or sheet face; Diameter 8 nanometer of nano wire, nanowire length 200 nanometer, its general molecular formula is Ca
0.7siO
2.7.
In the present embodiment, the BET specific surface area of calcium silicates is 450m
2/ g.
For a preparation method for the calcium silicates of water body dephosphorization, comprise the following steps:
(1) silica, calcium hydroxide, magnesium hydroxide, water are mixed to form slurries according to molar ratio 1:0.7:0.0003:60;
(2), the slurries in step (1) are reacted 2.5 hours under 200 DEG C of hydrothermal conditions after, then 140 DEG C of ageings 15 hours, after cooling, solid-liquor separation obtains solid-state calcium silicates;
(3), solid-state calcium silicates dry 5h at 115 DEG C of will obtaining in step (2), namely obtain the calcium silicates for water body dephosphorization.
In the present embodiment, the silica in step (1) is selected from the silica adopting liquid-phase precipitation method to obtain, such as precipitated silica (trade name: precipitation method White Carbon black).
Specific embodiment 4
1mol precipitated silica, 0.5mol calcium hydroxide, 0.00015mol magnesium hydroxide three kinds of components are uniformly mixed formation slurries in 20mol water.Slurries are warming up to 220 DEG C of reactions 2 hours in water heating kettle, naturally cool to 150 DEG C of ageings 20 hours afterwards.Nature cooled and filtered, solids obtains white products in 1 hour in 120 DEG C of dryings, and the SEM photo of product is shown in Fig. 1, specific area 592m
2/ g.By 2g products application in the phosphorus-containing wastewater 1L of manual simulation, (phosphorus content 150mg/L), phosphorus adsorbance is 0.152g phosphorus/g product, be applied in the phosphorus-containing wastewater 1L of manual simulation by the calcium silicates of 2g outsourcing Prof. Du Yucang, phosphorus adsorbance is only the calcium silicates of 0.085g phosphorus/g outsourcing Prof. Du Yucang.
Specific embodiment 5
1mol silica, 0.9mol calcium hydroxide, 0.0005mol magnesium hydroxide three kinds of components are uniformly mixed formation slurries in 100mol water.Slurries are warming up to 180 DEG C of reactions 3 hours in water heating kettle, naturally cool to 130 DEG C of ageings 10 hours afterwards.Nature cooled and filtered, solids obtains white products in 5 hours in 110 DEG C of dryings, and the SEM photo of product is shown in Fig. 2, specific area 305m
2/ g.By 2g products application in the phosphorus-containing wastewater 1L of manual simulation, phosphorus adsorbance is 0.211g phosphorus/g product.
Specific embodiment 6
1mol silica, 0.9mol calcium hydroxide, 0.0003mol magnesium hydroxide three kinds of components are uniformly mixed formation slurries in 50mol water.Slurries are warming up to 200 DEG C of reactions 3 hours in water heating kettle, naturally cool to 130 DEG C of ageings 15 hours afterwards.Nature cooled and filtered, solids obtains white products, specific area 319m in 8 hours in 100 DEG C of dryings
2/ g.By 2g products application in the phosphorus-containing wastewater 1L of manual simulation, phosphorus adsorbance is 0.205g phosphorus/g product.
Above embodiments of the present invention are elaborated.But the present invention is not limited to above-mentioned embodiment, in the ken that art those of ordinary skill possesses, can also make a variety of changes under the prerequisite not departing from present inventive concept.
Claims (4)
1. for a calcium silicates for water body dephosphorization, it is characterized in that, be made up of nano wire, between nano wire, be interconnected to constitute three-dimensional labyrinth structure by random node or sheet face; Diameter 5 ~ 10 nanometer of nano wire, nanowire length 100 ~ 300 nanometer, its general molecular formula is Ca
xsiO
x+2, 0.5≤x≤0.9.
2. a kind of calcium silicates for water body dephosphorization as claimed in claim 1, it is characterized in that, the BET specific surface area of described calcium silicates is 300 ~ 600m
2/ g.
3. for a preparation method for the calcium silicates of water body dephosphorization, it is characterized in that, comprise the following steps:
(1) by silica, calcium hydroxide, magnesium hydroxide, water according to molar ratio 1:(0.5 ~ 0.9): (0.0001 ~ 0.0005): (20 ~ 100) are mixed to form slurries;
(2), the slurries in step (1) are reacted 2 ~ 3 hours under 180 ~ 220 DEG C of hydrothermal conditions after, then 130 ~ 150 DEG C of ageings 10 ~ 20 hours, after cooling, solid-liquor separation obtains solid-state calcium silicates;
(3), will the solid-state calcium silicates that obtain in step (2) dry 1 ~ 10h at 90 ~ 120 DEG C, namely obtain the calcium silicates for water body dephosphorization.
4. the preparation method of a kind of calcium silicates for water body dephosphorization as claimed in claim 3, is characterized in that, the silica in step (1) is selected from the silica adopting liquid-phase precipitation method to obtain.
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Cited By (4)
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| CN107792945A (en) * | 2017-11-13 | 2018-03-13 | 常州美帛纺织品有限公司 | One kind is used to handle high-salt wastewater complexing agent |
| CN109133308A (en) * | 2018-10-10 | 2019-01-04 | 江苏京牧生物技术有限公司 | A kind of formula of compound wastewater inorganic agent |
| CN109482135A (en) * | 2018-11-06 | 2019-03-19 | 广东海洋大学 | A kind of preparation method and application of calcium silicates adsorbent material |
| CN113104856A (en) * | 2021-05-08 | 2021-07-13 | 中南大学 | Preparation method, product and application of water body phosphorus removal material |
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| JP2004043290A (en) * | 2002-05-14 | 2004-02-12 | Konoshima Chemical Co Ltd | Method of manufacturing porous calcium silicate and porous calcium silicate |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107792945A (en) * | 2017-11-13 | 2018-03-13 | 常州美帛纺织品有限公司 | One kind is used to handle high-salt wastewater complexing agent |
| CN107792945B (en) * | 2017-11-13 | 2021-03-05 | 陈云兰 | Complexing agent for treating high-salinity wastewater |
| CN109133308A (en) * | 2018-10-10 | 2019-01-04 | 江苏京牧生物技术有限公司 | A kind of formula of compound wastewater inorganic agent |
| CN109482135A (en) * | 2018-11-06 | 2019-03-19 | 广东海洋大学 | A kind of preparation method and application of calcium silicates adsorbent material |
| CN109482135B (en) * | 2018-11-06 | 2022-02-22 | 广东海洋大学 | Preparation method and application of calcium silicate adsorption material |
| CN113104856A (en) * | 2021-05-08 | 2021-07-13 | 中南大学 | Preparation method, product and application of water body phosphorus removal material |
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