CN108505115A - A kind of layered double hydroxide LDH-I2-Br2Whisker and its preparation method and application - Google Patents

A kind of layered double hydroxide LDH-I2-Br2Whisker and its preparation method and application Download PDF

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CN108505115A
CN108505115A CN201810288891.3A CN201810288891A CN108505115A CN 108505115 A CN108505115 A CN 108505115A CN 201810288891 A CN201810288891 A CN 201810288891A CN 108505115 A CN108505115 A CN 108505115A
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whisker
preparation
layered double
concentration
ldh
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吴健松
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Lingnan Normal University
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Lingnan Normal University
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    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/10—Inorganic compounds or compositions
    • C30B29/12—Halides
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
    • C30B29/62—Whiskers or needles
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
    • C30B7/14—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions the crystallising materials being formed by chemical reactions in the solution

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  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

The invention discloses a kind of layered double hydroxide LDH I2‑Br2Whisker and its preparation method and application.The chemical formula of the whisker is Mg6Al2(OH)14Br2I2·3H2O, the whisker pass through metal cation Mg2+、Al3+With anion I‑、Br‑And OH‑React precipitate and wash, dry after obtain.Layered double hydroxide LDH I provided by the invention2‑Br2Whisker is a kind of houghite compound of crystal whisker-shaped, both had the function of crystal whisker toughened reinforcement, there is the function of the classes talcs compounds such as adjustable denaturation, larger specific surface area and the interlayer ion interchangeability in aperture again, there is very extensive application prospect in toughened and reinforced material, the fields such as catalysis, fire-retardant, sorbing material.Preparation method provided by the invention, it is simple for process easy to operate, it is of low cost, it is suitble to large-scale promotion application.

Description

A kind of layered double hydroxide LDH-I2-Br2Whisker and preparation method thereof and Using
Technical field
The present invention relates to technical field of inorganic material, and in particular, to a kind of layered double hydroxide LDH-I2-Br2 Whisker and its preparation method and application.
Background technology
Layered double hydroxide（Layered Double Hydroxide, LDH）It is hydrotalcite （Hydrotalcite, HT）And houghite compound（Hydrotalcite-Like Compounds, HTLc）General designation, It is a kind of important inorganic functional material, has the function of catalysis, absorption, fire-retardant etc., be a kind of multifunctional inorganic material of environment-friendly type Material.
Most typical LDH is Mg6Al2(OH)16CO3·4H2O, also referred to as magnalium hydrotalcite, if in this magnalium hydrotalcite Mg2+、A13+Or CO3 2-Ion is replaced by other ions, you can obtains houghite（HTLc）.The general formula of HTLc is：（Wherein M2+For bivalent metal ion, such as Mg2 +、Ni2 +、 Co2 +、Zn2 +、Cu2 +Deng；M3+For trivalent metal ion, such as Al3 +、Cr3 +、Fe3 +、Sc3 +Deng；A is interlayer anion, such as CO3 2-、NO3-、Cl-、SO4 2-、PO4 3-、C6H4(COO)2 2- Deng；mFor Coating combination water number mesh）.By The plate layer formed is known as sheet-metal layers, byThe layer of composition is known as anion layer.This layer structure can use following table Show as follows：
Since HTLc has the adjustable denaturation in aperture, and there are larger specific surface area and interlayer ion interchangeability, therefore it is being urged There is very extensive application prospect in the fields such as change, fire-retardant, absorption, medicine, gene storage.
For LDH, HTLc class compound, the researcher that domestic and international many is engaged in this respect at present does a lot of work, and Gratifying achievement is all achieved in respective field.Research both domestic and external is concentrated mainly on setting for sheet-metal layers bivalent cation It changes, such as magnesium ion is replaced into copper ion or cobalt ions etc., anion metathesis is some such as amino by the design also having The organic biomolecules such as acid.At home, Beijing University of Chemical Technology achieves prodigious achievement to the research of LDH.They are designing Prodigious achievement in research is achieved in the intercalations LDH field of compound material such as cupric, cobalt, nickel, organic acid, polyacid.At abroad, also having Many scholars synthesize numerous important organic compounds and inorganization on preparing LDH technologies or using LDH as catalyst It closes on object or as many gratifying achievements are also achieved in the researchs such as fire retardant, adsorbent, provides a large amount of useful Experimental data.But to currently, LDH and HTLc class compounds are mainly laminated structure, LDH the and HTLc class compounds of crystal whisker-shaped are several Do not report.And the inorganic material of crystal whisker-shaped has toughened and reinforced function, develops LDH the or HTLc classes compound of crystal whisker-shaped then It can assign LDH and HTLc classes inorganic material preferably toughened and reinforced function, to further expand its application.
It is with certain whisker that LDH, which is prepared into whisker mostly, at present（Such as magnesium hydroxide crystal whisker）As predecessor, again Or technology of preparing route is tediously long, of high cost etc., is not suitable for large-scale application.Therefore, develop a kind of crystal whisker-shaped LDH and/or HTLc classes compound and its corresponding preparation process have great research significance and application value.
Invention content
The purpose of the invention is to overcome the above-mentioned deficiency of the prior art, a kind of layered double hydroxide is provided LDH-I2-Br2Whisker.Layered double-metal hydroxide whisker remove with the adjustable denaturation in aperture, larger specific surface area and Outside the function of the houghites class compound such as interlayer ion interchangeability, while also having the function of crystal whisker toughened reinforcement.
Another object of the present invention is to provide layered double-metal hydroxide LDH-I2-Br2The preparation side of whisker Method.
Another object of the present invention is to provide layered double-metal hydroxide LDH-I2-Br2Whisker is preparing toughening Application in supporting material, catalysis material, fire proofing or sorbing material.
The above-mentioned purpose of the present invention is achieved by following scheme：
A kind of layered double hydroxide LDH-I2-Br2The chemical formula of whisker, the whisker is Mg6Al2(OH)14Br2I2· 3H2O。
Preferably, the whisker passes through metal cation Mg2+、Al3+With anion I-、Br-And OH-It reacts to precipitate and wash Wash, dry after obtain.
The present invention provides a kind of layered double hydroxide LDH-I of specific composition2-Br2Whisker has whisker knot Toughened and reinforced function caused by structure；Simultaneously the substance again have HTLc class compounds possessed by aperture adjustable denaturation, The function of larger specific surface area and interlayer ion interchangeability, in toughened and reinforced material, the necks such as catalysis, fire-retardant, sorbing material There is very extensive application prospect in domain.
The present invention also protects layered double-metal hydroxide LDH-I simultaneously2-Br2The preparation method of whisker, feature It is, includes the following steps：
S1. MgI is prepared2·8H2O, NaBr and Al (NO3)3·9H2The mixed solution A of O, with the NaOH of 0.05~0.15mol/L Solution adjusts pH to 7.45~7.55；Mg in the mixed solution A2+A concentration of 2.10~2.30mol/L, Al3+It is a concentration of 0.70~0.90mol/L, Br-A concentration of 2.83~2.93mol/L；I-A concentration of 4.20~4.45mol/L；
S2. compound concentration be 0.01~0.02mol/L NaOH solution, be used in combination NaOH solution adjust S1 obtained by mixed solution to After pH is 8.10~8.30, is placed at 4~45 DEG C and reacts 102~106h generation precipitations, filter and wash precipitation, after drying to obtain the final product Layered double-metal hydroxide LDH-I2-Br2Whisker.
Inventor is to layered double hydroxide LDH-I2-Br2It is found unintentionally in the exploration of preparation process, raw material Type and its proportioning, pH regulation and control, reaction temperature and time have a significant impact to the pattern tool of final layered double hydroxide. Such as metal cation Mg2+And Al3+, anion I-、Br-And OH-Concentration it is excessive or too small, pH is excessively high or pH fluctuation range mistakes Greatly, reaction temperature is excessively high（Water evaporation rate is too fast）It is unable to get whisker morphology or obtains the yield of whisker morphology very It is low.The present invention finally prepares the layered double hydroxide LDH-I of crystal whisker-shaped by the preferred of this series of conditions2- Br2, preparation method is simple.
In addition, Qinghai Salt Lake（Such as Hoh Yanhu bittern, Chaka Salt lake bittern or Cha Er Han Salt Lake）There is the hardship of enormous amount Halogen, these bitterns are to prepare LDH-I2-Br2The extremely excellent natural resources of whisker.But these resources cannot get always science, effectively profit With, but leave unused always, this not only wastes salt lake resources, also so that the serious salination of salt lake Soil Surrounding and plant are withered Extremely, it is damaged to the ecological environment in salt lake, while also bringing difficulty to saltern resource exploitation in future.Using bittern in salt lake as Mg2+And Al3+Source, the natural resources can be made full use of, it is cost-effective, have important economic value.
Preferably, pH to 7.5 is adjusted in S1.
Preferably, Mg in mixed solution A described in S12+A concentration of 2.10mol/L, Al3+A concentration of 0.80mol/L, Br- A concentration of 2.93mol/L.
Preferably, a concentration of 0.1mol/L of NaOH solution described in S1.
Preferably, in S2 NaOH a concentration of 0.02mol/L.
Preferably, NaCO is added in S23Solution adjusts pH to 8.20.
In order to preferably regulate and control pH, prevents pH too low or fluctuation is excessive, it is preferable that protected in S2 by adding NaOH solution A NaOH solution is added every 6h so that pH value of reaction system increases by 0.05 in the pH for holding mixed solution.
In order to enable moisture evaporation is more uniformly distributed, further including wind step in S2 makes moisture evaporation, it is preferable that wind in S2 Wind speed be 4~5m/s.
Preferably, the reaction time described in S2 is the 104h that exposes to the weather.
Qinghai Salt Lake area has abundant solar energy resources and wind energy resources, long-term temperature at 5 ~ 45 DEG C, wind speed 4 ~ Precipitation obtained by S2 can be placed at the spaciousness of Qinghai Salt Lake area, moisture is realized using natural solar energy and wind energy resources by 5m/s Slow evaporation not only saves energy and realizes green chemical industry.
Layered double-metal hydroxide LDH-I2-Br2The application of whisker is also within the scope of the present invention, shown Using for layered double-metal hydroxide LDH-I2-Br2Whisker is preparing toughened and reinforced material, catalysis material, fire proofing Or the application in sorbing material.
Compared with prior art, the invention has the advantages that：
Layered double hydroxide LDH-I provided by the invention2-Br2Whisker is a kind of houghite compound of crystal whisker-shaped, Not only had the function of crystal whisker toughened reinforcement, but also had adjustable denaturation, larger specific surface area and the interlayer ion interchangeability in aperture Etc. classes talcs compound function, have in toughened and reinforced material, the fields such as catalysis, fire-retardant, sorbing material very extensive Application prospect.Preparation method provided by the invention, it is simple for process easy to operate, it is of low cost, it is suitble to large-scale promotion application.
Description of the drawings
Fig. 1 is that embodiment 1 prepares layered double hydroxide LDH-I2-Br2The route map of whisker.
Fig. 2 is layered double hydroxide LDH-I prepared by embodiment 12-Br2The SEM spectrum of whisker.
Fig. 3 is layered double hydroxide LDH-I prepared by embodiment 12-Br2The XRD spectrum of whisker.
Fig. 4 is layered double hydroxide LDH-I prepared by comparative example 12-Br2SEM spectrum.
Specific implementation mode
The present invention is made with reference to specific embodiment and further being elaborated, the embodiment is served only for explaining this Invention, is not intended to limit the scope of the present invention.Test method used in following embodiments is normal unless otherwise specified Rule method；Used material, reagent etc., unless otherwise specified, for the reagent and material commercially obtained.
Embodiment 1
Present embodiments provide a kind of layered double hydroxide LDH-I2-Br2Whisker, chemical formula Mg6Al2(OH)14Br2I2·3H2O, preparation process are as follows（As shown in Figure 1）：
（ⅰ）Prepare 6.60molL-1 MgI2·8H2O、8.80mol·L-1NaBr and 2.40molL-1 Al(NO3)3· 9H2O solution takes this 3 kinds of solution to be mixed in a beaker in stirring volumetric, and the pH value of mixed system is used The NaOH solution of 0.1mol/L is adjusted to pH=7.50, at this point, due to Al3+The hydrolysis of ion and so that solution is become muddy, but generate This phenomenon does not interfere with follow-up LDH-I2-Br2The growth of whisker.
（ⅱ）The NaOH solution for preparing 0.020mol/L, is added in the mixed liquor obtained by two steps, always while stirring Add to the pH of system then system is placed in pH=8.20 it is sunny（Temperature is 5 ~ 45 DEG C, and wind speed is 4~5m/s）Place It allows after exposing to the weather 104h, filters and wash precipitation, dry to get sample.In the time of this 104h, it was added every 6 hours The NaOH solution of 0.010mol/L, the amount being added every time are：The pH value for first measuring current arrangements, is then added alkali so that PH value increases by 0.05 unit, for example, after the 60h that exposes to the weather, it is 8.05 to measure system pH at this time, then be added alkali when one Straight be added to when system pH is 8.10 is terminated.
The layered double hydroxide LDH-I that the present embodiment is prepared2-Br2The draw ratio of whisker is 15~25:1, Good dispersion, whisker good crystalline have preferable toughened and reinforced function.
Embodiment 2
Present embodiments provide a kind of layered double hydroxide LDH-I2-Br2Whisker, chemical formula Mg6Al2(OH)14Br2I2·3H2O, the preparation process with embodiment 1, the difference is that, step（ⅰ）Middle MgI2·8H2O, NaBr and Al (NO3)3·9H2After O mixing, MgI in mixed liquor2·8H2A concentration of 2.20molL of O-1, NaBr a concentration of 2.88mol L-1With Al (NO3)3·9H2A concentration of 0.76molL of O-1。
The layered double hydroxide LDH-I that the present embodiment is prepared2-Br2The draw ratio of whisker is 15~25:1, Good dispersion, whisker good crystalline have preferable toughened and reinforced function.
Embodiment 3
Present embodiments provide a kind of layered double hydroxide LDH-I2-Br2Whisker, chemical formula Mg6Al2(OH)14Br2I2·3H2O, the preparation process is the same as embodiment 1, step（ⅰ）Middle MgI2·8H2O, NaBr and Al (NO3)3·9H2O is mixed Afterwards, MgI in mixed liquor2·8H2A concentration of 2.30molL of O-1, NaBr a concentration of 2.91molL-1With Al (NO3)3· 9H2A concentration of 0.84molL of O-1, after NaOH solution is added, the pH value of mixed liquor is 8.09.
The layered double hydroxide LDH-I that the present embodiment is prepared2-Br2The draw ratio of whisker is 15~25:1, Good dispersion, whisker good crystalline have preferable toughened and reinforced function.
Embodiment 4
Present embodiments provide a kind of layered double hydroxide LDH-I2-Br2Whisker, chemical formula Mg6Al2(OH)14Br2I2·3H2O, the preparation process is the same as embodiment 1, step（ⅰ）Middle MgI2·8H2O, NaBr and Al (NO3)3·9H2O is mixed Afterwards, after NaOH solution being added, the pH value of mixed liquor is 7.49 steps；（ⅱ）After NaOH solution is added, the pH value of mixed liquor is 8.16；Reaction time is 105h.
The layered double hydroxide LDH-I that the present embodiment is prepared2-Br2The draw ratio of whisker is 15~25:1, Good dispersion, whisker good crystalline have preferable toughened and reinforced function.
Comparative example 1
This comparative example provides a kind of layered double hydroxide LDH-I2-Br2Whisker, the preparation process with embodiment 1, The difference is that step（ⅰ）Middle MgI2·8H2O, NaBr and Al (NO3)3·9H2After O mixing, MgI in mixed liquor2·8H2O A concentration of 0.90molL-1。
As a result, after according to the implementation Process in embodiment 1, there cannot be the substance of Whiskers shape.
Comparative example 2
This comparative example provides a kind of layered double hydroxide LDH-I2-Br2Whisker, the preparation process with embodiment 1, The difference is that step（ⅰ）Middle MgI2·8H2O, NaBr and Al (NO3)3·9H2After O mixing, Al (NO in mixed liquor3)3· 9H2A concentration of 0.26molL of O-1。
As a result, after according to the implementation Process in embodiment 1, there cannot be the substance of Whiskers shape.
Comparative example 3
This comparative example provides a kind of layered double hydroxide LDH-I2-Br2Whisker, the preparation process with embodiment 1, The difference is that step（ⅰ）Middle MgI2·8H2O, NaBr and Al (NO3)3·9H2After O mixing, the concentration of NaBr in mixed liquor For 0.30molL-1。
As a result, after according to the implementation Process in embodiment 1, there cannot be the substance of Whiskers shape.
Comparative example 4
This comparative example provides a kind of layered double hydroxide LDH-I2-Br2Whisker, the preparation process with embodiment 1, The difference is that step（ⅰ）Middle MgI2·8H2O, NaBr and Al (NO3)3·9H2After O mixing, with NaOH solution by mixed liquor PH value be adjusted to 9.40.
As a result, after according to the implementation Process in embodiment 1, after 7d, there cannot be the substance of Whiskers shape.
Comparative example 5
This comparative example provides a kind of layered double hydroxide LDH-I2-Br2Whisker, the preparation process with embodiment 1, The difference is that step（ⅱ）After NaOH solution is added, the pH value of mixed liquor is 11.
As a result, after according to the implementation Process in embodiment 1, after 7d, there cannot be the substance of Whiskers shape.
Comparative example 6
This comparative example provides a kind of layered double hydroxide LDH-I2-Br2Whisker, the preparation process with embodiment 1, The difference is that step（ⅱ）In the reaction temperature of last mixed liquor be 90 DEG C.
As a result, after according to the implementation Process in embodiment 1, after 7d, there cannot be the substance of Whiskers shape.
Performance evaluation
1, scanning electron microscope（SEM）Analysis
Fig. 2 is the shape appearance figure for the sample that embodiment 1 is prepared.From figure 2 it can be seen that embodiment 1 is prepared almost It is all whisker, yield is high, and the draw ratio of whisker is 15~25:1, good dispersion, whisker good crystalline.And comparative example 1~5 is prepared into To sample not instead of crystal whisker-shaped, other non-crystal whisker-shapeds, as shown in figure 4, Fig. 4 be comparative example 1 prepare sample.
2, X-ray diffraction（XRD）Analysis
Fig. 3 is layered double hydroxide LDH-I prepared by embodiment 12-Br2The XRD diagram of whisker.It can be with from XRD diffraction patterns Find out, layered double hydroxide LDH-I2-Br2There is whisker the layer structure of LDH, the LDH of layer structure to exist（003） Crystal face diffracted intensity is maximum, followed by（006）Crystal face, minimum is（009）, this is because lamellar compound " disappearing to XRD Caused by light " effect.It has marked in the accompanying drawings（003）、（006）、（009）The corresponding diffraction maximum of crystal face.The provable stratiform is double Metal hydroxides LDH-I2-Br2Whisker is exactly the substance for having LDH structures, that is, the necessarily general character with LDH.
3, elemental analysis
Sample topography prepared by Examples 1 to 4 is similar, and by taking sample prepared by embodiment 1 as an example, elemental analysis is carried out to sample, The results are shown in Table 1.Table 1 statistics indicate that, embodiment 1 provide sample substantially conform to, in conjunction with oxygen（The content of oxygen is obtained by minusing）, protium content, can Deduce that its chemical formula is Mg6Al2(OH)14Br2I2·3H2O。
1 LDH-I of table2-Br2Elemental analysis result
Elemental analysis is carried out to the sample that other embodiment is prepared, each sample substantially conforms to, in conjunction with oxygen（The content of oxygen is obtained by minusing）, protium content, can Deduce that its chemical formula is Mg6Al2(OH)14Br2I2·3H2O。
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than is protected to the present invention The limitation of shield range can also be made on the basis of above description and thinking for those of ordinary skill in the art Other various forms of variations or variation, there is no necessity and possibility to exhaust all the enbodiments.It is all the present invention All any modification, equivalent and improvement etc., should be included in the protection of the claims in the present invention made by within spirit and principle Within the scope of.

Claims (10)

1. a kind of layered double hydroxide LDH-I2-Br2Whisker, which is characterized in that the chemical formula of the whisker is Mg6Al2 (OH)14Br2I2·3H2O。
2. the layered double-metal hydroxide LDH-I of claim 12-Br2The preparation method of whisker, which is characterized in that including Following steps：
S1. MgI is prepared2·8H2O, NaBr and Al (NO3)3·9H2The mixed solution A of O, with the NaOH of 0.05~0.15mol/L Solution adjusts pH to 7.45~7.55；Mg in the mixed solution A2+A concentration of 2.10~2.30mol/L, Al3+It is a concentration of 0.70~0.90mol/L, Br-A concentration of 2.83~2.93mol/L；
S2. compound concentration be 0.01~0.02mol/L NaOH solution, be used in combination NaOH solution adjust S1 obtained by mixed solution to After pH is 8.10~8.30, is placed at 4~45 DEG C and reacts 102~106h generation precipitations, filter and wash precipitation, after drying to obtain the final product Layered double-metal hydroxide LDH-I2-Br2Whisker.
3. preparation method according to claim 2, which is characterized in that adjust pH to 7.5 in S1.
4. preparation method according to claim 2, which is characterized in that Mg in mixed solution A described in S12+It is a concentration of 2.20mol/L Al3+A concentration of 0.80mol/L, Br-A concentration of 2.93mol/L.
5. preparation method according to claim 2, which is characterized in that a concentration of 0.1mol/L of NaOH solution described in S1.
6. preparation method according to claim 2, which is characterized in that a concentration of 0.02mol/L of NaOH in S2.
7. preparation method according to claim 2, which is characterized in that NaCO is added in S23Solution adjusts pH to 8.20.
8. preparation method according to claim 7, which is characterized in that keep mixed solution by adding NaOH solution in S2 PH, every 6h be added a NaOH solution so that pH value of reaction system increase by 0.05.
9. preparation method according to claim 2, which is characterized in that the reaction time described in S2 is the 104h that exposes to the weather, institute The wind speed for stating wind is 4~5m/s.
10. the layered double-metal hydroxide LDH-I of claim 12-Br2Whisker is preparing toughened and reinforced material, catalysis material Application in material, fire proofing or sorbing material.
CN201810288891.3A 2018-03-30 2018-03-30 A kind of layered double hydroxide LDH-I2-Br2Whisker and its preparation method and application Withdrawn CN108505115A (en)

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Application publication date: 20180907