CN104386749A - Method for preparing strontium aluminum tantalate powder - Google Patents
Method for preparing strontium aluminum tantalate powder Download PDFInfo
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- CN104386749A CN104386749A CN201410599910.6A CN201410599910A CN104386749A CN 104386749 A CN104386749 A CN 104386749A CN 201410599910 A CN201410599910 A CN 201410599910A CN 104386749 A CN104386749 A CN 104386749A
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- C01G35/006—Compounds containing, besides tantalum, two or more other elements, with the exception of oxygen or hydrogen
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- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
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- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
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- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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Abstract
The invention discloses a method for preparing strontium aluminum tantalate powder. The method comprises the steps of thoroughly dissolving a strontium salt, a tantalum salt, an aluminum salt and different cross-linking agents, which serve as raw materials, into a methanol-water mixture solution, then, carrying out cross-linking reaction at a certain temperature, then, mixing with a molten salt, grinding, so as to thoroughly mix uniformly, carrying out high-temperature reaction, then, cooling to room temperature, and then, carrying out water washing and drying, thereby obtaining the strontium aluminum tantalate powder, wherein the strontium salt is either or a mixture of strontium chloride and strontium nitrate, the tantalum salt is either or a mixture of tantalum pentachloride and pentaethoxy tantalum, the aluminum salt is either or a mixture of aluminum chloride and aluminum nitrate, the cross-linking agents are either or a mixture of urea and citric acid, and the molten salt is a mixture of sodium chloride and strontium chloride. According to the method, the process is simple, convenient and easy to implement, the purity is high, and the preparation cost is low, so that the method is suitable for mass production; the prepared product can be applied to the fields of ferroelectrics, photoelectricity, photocatalytic hydrogen generation, fuel cells and the like.
Description
Technical field
The invention belongs to the preparing technical field of ceramic, specifically relate to a kind of aluminium tantalic acid strontium raw powder's production technology.
Background technology
The general molecular formula of uhligite type compound is ABO
3, uhligite is generally cubes or octahedra shape, has gloss, and light color is to brown, and this compounds is found to be the calcium titanate (CaTiO be present in uhligite stone the earliest
3) compound, therefore gain the name.Because perovskite compound crystal structure has numerous characteristics, apply in Condensed Matter Physics and chemical industry catalysis and study very extensive.Perovskite type photocatalyst makes with its distinctive structure the focus becoming research both at home and abroad in photocatalysis field, illustrates tempting application prospect with important photocatalytic process such as perovskite-type material photocatalytic hydrogen production by water decomposition, degradating organic dye, photocatalytic reduction of carbon oxide to people.Aluminium tantalic acid strontium (SrAl
1/2ta
1/2o
3) be that (A position is Sr to a kind of important composite perofskite shaped material; B position is Al
1/2ta
1/2).Due to the crystalline structure that it is special, be mainly used in the fields such as photochemical catalysis, ion sensor, magnetoresistance material, fuel cell.Traditional solid state reaction technology preparing aluminium tantalic acid strontium powder is consuming time longer and need hot conditions, and reaction is normally carried out at 1100 ~ 1300 DEG C, thus limits the production of aluminium tantalic acid strontium powder.
Summary of the invention
The present invention is intended to overcome the deficiencies in the prior art part and provides a kind of technique simple, and object product yield is high, and preparation cost is low, and operating procedure is simple, the aluminium tantalic acid strontium raw powder's production technology of good dispersity.The present invention, by utilizing linking agent, achieves the technological process that pure phase aluminium tantalic acid strontium powder is produced in Low Temperature Solid-Phase calcining.By organizing simultaneous test, finding that linking agent plays an important role in the reaction more, having utilized its fusing in the reaction and combustion heat release successfully to generate the aluminium tantalic acid strontium powder with good crystallinity.Preparation method of the present invention can be applied to the chemosynthesis research of other functional materials similar with aluminium tantalic acid strontium equally, and has broad application prospects.
For achieving the above object, the present invention realizes like this.
A kind of aluminium tantalic acid strontium raw powder's production technology, strontium salt, tantalum salt, aluminium salt and linking agent fully dissolve by system in methanol-water mixing solutions, carry out crosslinking reaction at a certain temperature, continue mixed with fused salt and grind and make it fully mix, after pyroreaction, temperature drops to room temperature, then carries out washing and drying, namely obtains aluminium tantalic acid strontium powder.
As a kind of preferred version, the mol ratio of strontium salt of the present invention, tantalum salt, aluminium salt, fused salt and linking agent is 2: 1: 1: 4: 40 ~ 200.
As another kind of preferred version, strontium salt of the present invention is one in strontium chloride and strontium nitrate or its mixture.
Further, tantalum salt of the present invention is one in tantalum pentachloride or five ethoxy-tantalum or its mixture.
Further, aluminium salt of the present invention is one in aluminum chloride or aluminum nitrate or its mixture.
Further, linking agent of the present invention is one in urea or citric acid or its mixture.
Again further, described crosslinking reaction temperature is at 150 ~ 500 DEG C, and cross-linking reaction time is 2 ~ 10 h.
Thirdly, the temperature of reaction of described high temperature is at 700 ~ 1000 DEG C, and the reaction times is 6 ~ 24 h.
Fused salt of the present invention is the mixture of sodium-chlor and strontium chloride; The mol ratio of sodium-chlor and strontium chloride is 1:1.
Compared with prior art, the present invention has following features.
(1) present invention process route is simple, and preparation cost is low, easy to control, has higher production efficiency.
(2) the object product aluminium tantalic acid strontium powder prepared of the present invention, its purity is high, and foreign matter content is low, good dispersity, can meet the requirement of modern industry to aluminium tantalic acid strontium powder product.
(3) the present invention can react under 700 ~ 1000 DEG C of environment, and the reaction times is 6 ~ 24 h, and energy-saving effect is obvious.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described.Protection scope of the present invention is not only confined to the statement of following content.
The X-ray diffractogram of the aluminium tantalic acid strontium powder of Fig. 1 prepared by the present invention.
The SEM figure of the aluminium tantalic acid strontium powder of Fig. 2 prepared by the present invention.
The SEM figure of the aluminium tantalic acid strontium powder of Fig. 3 prepared by the present invention.
The SEM figure of the aluminium tantalic acid strontium powder of Fig. 4 prepared by the present invention.
The infrared spectrogram of the aluminium tantalic acid strontium powder of Fig. 5 prepared by the present invention.
The ultraviolet-visible spectrogram of the aluminium tantalic acid strontium powder of Fig. 6 prepared by the present invention.
The energy gap figure of the aluminium tantalic acid strontium powder of Fig. 7 prepared by the present invention.
The aluminium tantalic acid strontium powder of Fig. 8 prepared by the present invention is as the catalytic activity phenogram of photocatalyst.
Embodiment
The present invention with strontium salt, tantalum salt, aluminium salt and different linking agent for raw material.Raw material is according to certain mol ratio, fully dissolve in methanol-water mixing solutions (volume ratio 1:1), then at a certain temperature after crosslinking reaction, mixing with fused salt (mixture of sodium-chlor and strontium chloride mol ratio 1:1) and grind makes it fully mix, after pyroreaction, temperature carries out washing and drying after dropping to room temperature again, and namely obtain aluminium tantalic acid strontium powder, its preparation process is.
(1) by strontium salt, tantalum salt, aluminium salt and different linking agent according to after certain molar ratio weighing, be placed in alcohol water mixed solution and fully dissolve.
(2) by above-mentioned solution, at 150 ~ 500 DEG C, crosslinking reaction 2 ~ 10 h.
(3) naturally cool to room temperature, and after fused salt (mixture of sodium-chlor and strontium chloride mol ratio 1:1) mixing, put into mortar and grind and carefully make it mix, milling time 30 minutes.
(4) after in above-mentioned mixture loading crucible, put into chamber type electric resistance furnace, calcination reaction, temperature of reaction 700 ~ 1000 DEG C, the reaction times is 6 ~ 24 h, and naturally cooling, also after washing and drying, namely obtains aluminium tantalic acid strontium powder.
See shown in Fig. 1 to 8, the aluminium tantalic acid strontium powder preparing gained is carried out XRD and ultraviolet-visible spectrum analysis by the present invention, and consequently, products obtained therefrom aluminium tantalic acid strontium powder XRD diffraction pattern is consistent with standard spectrogram, and degree of crystallinity very strong (Fig. 1).As can be seen from the SEM figure of products obtained therefrom aluminium tantalic acid strontium powder, aluminium tantalic acid strontium powder is uniformly dispersed, and size is (Fig. 2 ~ 4) between 80 ~ 150 nm.The infrared spectrogram of the aluminium tantalic acid strontium powder of Fig. 5 prepared by the present invention.The ABSORPTION EDGE of products obtained therefrom aluminium tantalic acid strontium powder at about 283 nm (Fig. 6), energy gap about 4.38 eV(Fig. 7).And under ultraviolet light conditions (predominant wavelength 254 nm), in certain catalysis auxiliary and the aqueous solution of finite concentration sacrifice agent, in the reaction model of photochemical catalysis aquatic products hydrogen, have very high catalytic activity (Fig. 8).
Embodiment 1.
Methanol aqueous solution (volume ratio 1:1) stirring and dissolving is put into by after strontium chloride, tantalum pentachloride, aluminum chloride and citric acid precise.By this solution, at 450 DEG C, crosslinking reaction 8 h, after reaction, naturally cools to room temperature, and after fused salt (fused salt is the mixture of sodium-chlor and strontium chloride, sodium-chlor and strontium chloride mol ratio 1:1) mixes, put into mortar grind careful, milling time 30 minutes.The mol ratio of above-mentioned strontium chloride, tantalum pentachloride, aluminum chloride, fused salt and citric acid is 2: 1: 1: 4: 50.Loaded by above-mentioned mixture after in crucible and put into chamber type electric resistance furnace, calcination reaction, temperature of reaction 900 DEG C, the reaction times is 8 h, and cooling after washing is dry, i.e. aluminium tantalic acid strontium powder processed.Its product purity is not less than 99.73%, foreign matter content: carbon is less than 0.11%; Chlorine is less than 0.15%.Under ultraviolet light conditions (predominant wavelength 254 nm), supporting Pt, as after auxiliary agent, is in the aqueous solution of sacrifice agent at methyl alcohol, and the efficiency of Photocatalyzed Hydrogen Production is 19.5 μm of ol/h.
Embodiment 2.
Methanol aqueous solution (volume ratio 1:1) stirring and dissolving is put into by after strontium nitrate, five ethoxy-tantalum, aluminum nitrate and urea precise.By this solution, at 150 DEG C, crosslinking reaction 10 h, after reaction, naturally cools to room temperature, and after fused salt (fused salt is the mixture of sodium-chlor and strontium chloride, sodium-chlor and strontium chloride mol ratio 1:1) mixes, put into mortar grind careful, milling time 30 minutes.The mol ratio of above-mentioned strontium nitrate, five ethoxy-tantalum, aluminum nitrate, fused salt and urea is 2: 1: 1: 4: 200.Loaded by above-mentioned mixture after in crucible and put into chamber type electric resistance furnace, calcination reaction, temperature of reaction 1000 DEG C, the reaction times is 12 h, and cooling after washing is dry, i.e. aluminium tantalic acid strontium powder processed.Its product purity is not less than 99.80%, foreign matter content: carbon is less than 0.05%; Chlorine is less than 0.05%.Under ultraviolet light conditions (predominant wavelength 254 nm), supporting Pt, as after auxiliary agent, is in the aqueous solution of sacrifice agent at methyl alcohol, and the efficiency of Photocatalyzed Hydrogen Production is 25.3 μm of ol/h.
Embodiment 3.
Methanol aqueous solution (volume ratio 1:1) stirring and dissolving is put into by after strontium nitrate, tantalum pentachloride, aluminum nitrate and citric acid precise.By this solution, at 450 DEG C, crosslinking reaction 8 h, after reaction, naturally cools to room temperature, and after fused salt (fused salt is the mixture of sodium-chlor and strontium chloride, sodium-chlor and strontium chloride mol ratio 1:1) mixes, put into mortar grind careful, milling time 30 minutes.The mol ratio of above-mentioned strontium nitrate, tantalum pentachloride, aluminum nitrate, fused salt and citric acid is 2: 1: 1: 4: 60.Loaded by above-mentioned mixture after in crucible and put into chamber type electric resistance furnace, calcination reaction, temperature of reaction 1000 DEG C, the reaction times is 6 h, and cooling after washing is dry, i.e. aluminium tantalic acid strontium powder processed.Its product purity is not less than 99.90%, foreign matter content: carbon is less than 0.05%; Chlorine is less than 0.05%.Under ultraviolet light conditions (predominant wavelength 254 nm), supporting Pt, as after auxiliary agent, is in the aqueous solution of sacrifice agent at methyl alcohol, and the efficiency of Photocatalyzed Hydrogen Production is 20.1 μm of ol/h(Fig. 8).
Embodiment 4.
Methanol aqueous solution (volume ratio 1:1) stirring and dissolving is put into by after strontium nitrate, tantalum pentachloride, aluminum nitrate and citric acid precise.By this solution, at 500 DEG C, crosslinking reaction 8 h, after reaction, naturally cools to room temperature, and after fused salt (fused salt is the mixture of sodium-chlor and strontium chloride, sodium-chlor and strontium chloride mol ratio 1:1) mixes, put into mortar grind careful, milling time 30 minutes.The mol ratio of above-mentioned strontium nitrate, tantalum pentachloride, aluminum nitrate, fused salt and citric acid is 2: 1: 1: 4: 60.Loaded by above-mentioned mixture after in crucible and put into chamber type electric resistance furnace, calcination reaction, temperature of reaction 1000 DEG C, the reaction times is 6 h, and cooling after washing is dry, i.e. aluminium tantalic acid strontium powder processed.Its product purity is not less than 99.97%, foreign matter content: carbon is less than 0.02%; Chlorine is less than 0.01%.Under ultraviolet light conditions (predominant wavelength 254 nm), supporting Pt is as after auxiliary agent, and in pure water, the efficiency of photochemical catalysis aquatic products hydrogen is 18.1 μm of ol/h; Without auxiliary agent, in pure water, the efficiency of Photocatalyzed Hydrogen Production is 9.8 μm of ol/h.
Embodiment 5.
Methanol aqueous solution (volume ratio 1:1) stirring and dissolving is put into by after strontium nitrate, tantalum pentachloride, aluminum nitrate and citric acid precise.By this solution, at 500 DEG C, crosslinking reaction 10 h, after reaction, naturally cools to room temperature, and after fused salt (fused salt is the mixture of sodium-chlor and strontium chloride, sodium-chlor and strontium chloride mol ratio 1:1) mixes, put into mortar grind careful, milling time 30 minutes.The mol ratio of above-mentioned strontium nitrate, tantalum pentachloride, aluminum nitrate, fused salt and citric acid is 2: 1: 1: 4: 60.Loaded by above-mentioned mixture after in crucible and put into chamber type electric resistance furnace, calcination reaction, temperature of reaction 1000 DEG C, the reaction times is 24 h, and cooling after washing is dry, i.e. aluminium tantalic acid strontium powder processed.Its product purity is not less than 99.98%, foreign matter content: carbon is less than 0.01%; Chlorine is less than 0.01%.Under ultraviolet light conditions (predominant wavelength 254 nm), supporting Pt is as after auxiliary agent, and in pure water, the efficiency of Photocatalyzed Hydrogen Production is 15.6 μm of ol/h; Without auxiliary agent, in pure water, the efficiency of Photocatalyzed Hydrogen Production is 8.6 μm of ol/h.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an aluminium tantalic acid strontium raw powder's production technology, it is characterized in that, strontium salt, aluminium salt, tantalum salt and linking agent are fully dissolved in methanol-water mixing solutions, carry out crosslinking reaction at a certain temperature, continue mixed with fused salt and grind and make it fully mix, after pyroreaction, temperature drops to room temperature, carry out washing and drying again, namely obtain aluminium tantalic acid strontium powder.
2. aluminium tantalic acid strontium raw powder's production technology according to claim 1, is characterized in that: the mol ratio of described strontium salt, aluminium salt, tantalum salt, fused salt and linking agent is 2: 1: 1: 4: 40 ~ 200.
3. aluminium tantalic acid strontium raw powder's production technology according to claim 2, is characterized in that: described strontium salt is one in strontium chloride and strontium nitrate or its mixture.
4. aluminium tantalic acid strontium raw powder's production technology according to claim 3, is characterized in that: described aluminium salt is one in aluminum chloride or aluminum nitrate or its mixture.
5. aluminium tantalic acid strontium raw powder's production technology according to claim 4, is characterized in that: described tantalum salt is one in tantalum pentachloride or five ethoxy-tantalum or its mixture.
6. aluminium tantalic acid strontium raw powder's production technology according to claim 5, is characterized in that: described linking agent is one or its mixture of urea or citric acid.
7., according to arbitrary described aluminium tantalic acid strontium powder preparation method of claim 1 ~ 6, it is characterized in that: described crosslinking reaction temperature is at 150 ~ 500 DEG C, and cross-linking reaction time is 2 ~ 10 h.
8. aluminium tantalic acid strontium powder preparation method according to claim 7, is characterized in that: the temperature of described pyroreaction is at 700 ~ 1000 DEG C, and the reaction times is 6 ~ 24 h.
9. aluminium tantalic acid strontium raw powder's production technology according to claim 8, is characterized in that: described fused salt is the mixture of sodium-chlor and strontium chloride; The mol ratio of sodium-chlor and strontium chloride is 1:1.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1597097A (en) * | 2004-08-30 | 2005-03-23 | 南京大学 | Preparation method of high specific surface tantalate and niobate photo catalyst |
| DE102012022606A1 (en) * | 2012-11-19 | 2014-05-22 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Coated particulate electrode material, useful in lithium rechargeable batteries and/or double-layer capacitors, comprises particulate electrode material comprising lithium-intercalating and lithium deintercalating substances |
| WO2014143880A1 (en) * | 2013-03-15 | 2014-09-18 | Siluria Technologies, Inc. | Catalysts for petrochemical catalysis |
| CN104071844A (en) * | 2014-07-15 | 2014-10-01 | 渤海大学 | Burning method for preparing Sr2YTaO6 powder |
| CN104085925A (en) * | 2014-07-15 | 2014-10-08 | 渤海大学 | Preparation method of LATON perovskite-type oxynitride powder |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1597097A (en) * | 2004-08-30 | 2005-03-23 | 南京大学 | Preparation method of high specific surface tantalate and niobate photo catalyst |
| DE102012022606A1 (en) * | 2012-11-19 | 2014-05-22 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Coated particulate electrode material, useful in lithium rechargeable batteries and/or double-layer capacitors, comprises particulate electrode material comprising lithium-intercalating and lithium deintercalating substances |
| WO2014143880A1 (en) * | 2013-03-15 | 2014-09-18 | Siluria Technologies, Inc. | Catalysts for petrochemical catalysis |
| CN104071844A (en) * | 2014-07-15 | 2014-10-01 | 渤海大学 | Burning method for preparing Sr2YTaO6 powder |
| CN104085925A (en) * | 2014-07-15 | 2014-10-08 | 渤海大学 | Preparation method of LATON perovskite-type oxynitride powder |
Non-Patent Citations (1)
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| 宋煜昕: "熔盐法合成SrBi2Ta2O9粉体", 《无机材料学报》, vol. 17, no. 1, 31 January 2002 (2002-01-31) * |
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