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WO2004000757A1 - Procede d'assemblage de materiau a structure d'intercalation de supermolecule anionique - Google Patents

Procede d'assemblage de materiau a structure d'intercalation de supermolecule anionique Download PDF

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WO2004000757A1
WO2004000757A1 PCT/CN2002/000754 CN0200754W WO2004000757A1 WO 2004000757 A1 WO2004000757 A1 WO 2004000757A1 CN 0200754 W CN0200754 W CN 0200754W WO 2004000757 A1 WO2004000757 A1 WO 2004000757A1
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acid
ldhs
guest
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interlayer
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Xue Duan
Lingling Ren
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Beijing University of Chemical Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00Catalysts comprising molecular sieves
    • B01J29/04Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/049Pillared clays
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/007Mixed salts
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/14Methods for preparing oxides or hydroxides in general
    • C01B13/145After-treatment of oxides or hydroxides, e.g. pulverising, drying, decreasing the acidity
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00Compounds of aluminium
    • C01F7/78Compounds containing aluminium, with or without oxygen or hydrogen, and containing two or more other elements
    • C01F7/784Layered double hydroxide, e.g. comprising nitrate, sulfate or carbonate ions as intercalating anions
    • C01F7/785Hydrotalcite
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00Crystal-structural characteristics
    • C01P2002/20Two-dimensional structures
    • C01P2002/22Two-dimensional structures layered hydroxide-type, e.g. of the hydrotalcite-type

Definitions

  • the invention relates to an interlayer assembly method of an anionic supermolecular structure layer pillar material.
  • Bimetal composite hydroxides also known as Layered Double Hydroxides (LDHs for short), have the properties of intercalation assembly, which can be used to obtain a variety of different anionic supramolecular layer materials. Intercalation assembly methods include co-precipitation, ion exchange, and structural restoration.
  • LDHs Layered Double Hydroxides
  • the literature [V.Prevot, C. Forano and JPBesse, Inorg. Chem., 1998, 37,4293-4301] adopted the structure recovery method under the protection of N 2 gas to obtain a layered material with interlayer objects as organic macromolecules.
  • the disadvantage is that the obtained material has a large number of amorphous phases.
  • SUMMARY OF THE INVENTION The purpose of the present invention is: According to the synthesis principle of LDHs layered pillar materials, a new intercalation assembly method is used to insert specific guest molecules between LDHs layers to prepare a single crystal phase. LDHs with uniform interlayer structure and pure interlayer object.
  • the so-called back-mixed precipitation method is to back-mix the synthesized CO 3 -LDHs with an acid to form a salt, and the obtained salt is co-precipitated with an alkali to form intercalated hydrotalcite.
  • the reaction mechanism of the present invention is:
  • M 2+ represents Mg2 + , Ni 2+ , Zn 2+ , Fe 2+ or Cu 2+ divalent metal ions
  • M 3+ represents Co 3+ , Fe 3+ , Ti 3+ , Al 3+ or Ga 3+ trivalent metal ion
  • AHx represents an inorganic or organic acid guest molecule, the guest molecule should have a certain water solubility, and the pH value of the aqueous solution is less than 4
  • A represents Cl S0 4 2 N0 3 ⁇ P0 4 3 -and other inorganic Acid acid ion or tartaric acid, glutamic acid, aspartic acid, citric acid, malic acid, benzoic acid, p-aminobenzoic acid, adipic acid and other organic acid acid ion
  • [M 2+ 6 M 3+ 2 (OH) 16 ] (C0 3 ) .4 0 is the structural formula of interlayer anion is CO /-ion hydrotalcite (C0 3 -LDHs); [
  • the advantage of the intercalation assembly method is that, on the one hand, in the mechanism reaction formula 2, the salt generated by the reaction formula 1 is dripped into NaOH, so that the reaction pH> 9 is easy to control; on the other hand, it is prepared by this method Although the LDHs material of the intercalation structure is not protected by gas, there is no CO 3 2 -ion between the layers, which overcomes the defect of coexistence of CO /-ions and guest ions between the layers.
  • the object is an inorganic or organic acid with certain water solubility and its aqueous solution pH ⁇ 4, such as hydrochloric acid, carbonic acid, nitric acid, phosphoric acid, tartaric acid, glutamic acid, aspartic acid, citric acid, malic acid, benzoic acid, Para-aminobenzoic acid, adipic acid, etc.
  • hydrochloric acid carbonic acid, nitric acid, phosphoric acid, tartaric acid, glutamic acid, aspartic acid, citric acid, malic acid, benzoic acid, Para-aminobenzoic acid, adipic acid, etc.
  • step C Prepare an aqueous NaOH solution with a concentration of 0.01-0.5M and add it to the reactor with condensation and stirring. While stirring, add the clear solution obtained in step B dropwise. Keep the dropping process pH> 9. After the dropwise addition is completed, 7 Reflux for about 6 hours, filter, wash thoroughly with hot water to pH ⁇ 8, dry at about 85 ° C for about 24 hours, and insert and assemble to obtain the pillar pillar material A-LDHso.
  • the layered column material prepared by the dilute hydrochloric acid backmix precipitation method has no air bubbles, indicating that although the intercalation structure LDHs material prepared by this method does not use> 1 2 gas protection, there is no C0 3 2 _ ion between the layers, so This synthesis method overcomes the defect of coexistence of CO 3 2 -ions and guest ions in the layers. Concrete real formula
  • Step A Dissolve 61.5 g (0.24 mol) of solid Mg (N0 3 ) 2 ⁇ 6H 2 0 and 45.0 g (0.12 mol) of solid Al (N0 3 ) 3 ⁇ 9 ⁇ 2 0 in 225 ml of 0; 253g (0.24mol) solid N3 ⁇ 4C0 3 and 23.0g (0.58mol) NaOH dissolved in 225ml of water, alkali solution rapidly at room temperature and a solution of salt nucleating film in the rotary reactor, and the resulting crystal slurry was 100 ° C It was centrifuged for 6 hours, centrifuged, and the obtained sample was washed to a pH of less than 8, 70 ° C and dried for 24 hours to obtain Mg-Al-LDHs, whose Mg ⁇ / A + ⁇ : 1.
  • Step B 4.0 g of LDHs were added to a container containing 100 ml of deionized water, magnetically stirred at room temperature, and an excess of 7.5 g of glutamic acid was added. At this time, the turbid liquid in the container changed to a clear solution.
  • Step C Dissolve 2 g of NaOH in the container with 100 ml of pure water, and then pour into the reactor with condensation and stirring. While stirring, add the clarified solution in step B dropwise. Keep the dropping process pH> 9. Dropping is completed. It was condensed and refluxed for 6 hours, filtered, washed with hot water to pH ⁇ 8, and dried at about 85 ° C for 241 ⁇ m. The interlayer was assembled to obtain LDHs with glutamic acid intercalation structure. o
  • Step B Add 3.0 g of LDHs to a container containing 100 ml of deionized water, magnetically stir at room temperature, and add 6.5 g of excess lactic acid. At this time, the turbid liquid in the container changes to a clear solution.
  • Step C According to the method of Step C in Example 1, a Mg-Al type hydrotalcite pillar material with an interlayer anion of tartaric acid was prepared.
  • IR spectrum shows that the prepared lactic acid intercalation structure LDHs material has a C0 3 2 -peak at 1377cm- 1 and disappears, and carboxylates appear at 1587 and B ⁇ cm- 1 respectively .
  • Asymmetric and symmetrical absorption bands of acid ions are known from the X-ray diffraction pattern.
  • the experiment proves that the lactic acid is assembled into the interlayer of LDHs by the back-mixed precipitation method, and the Mg-Al type hydrotalcite pillar material with interlayer anion as lactic acid molecule is obtained.
  • the layered pillar material prepared by the mixed precipitation method has no air bubbles, indicating that the LDHs layered pillar material prepared by this method Although no gas protection is used, there is no co 3 2 -ion between the layers, so this synthesis method can better overcome the coexistence of co 3 2 -ions and guest ions between the layers.
  • Step A Dissolve 123.1 g (0.48 mol) of solid Mg (N0 3 ) 2 6H 2 0 and 45.0 g (0.12 mol) of solid Al (N0 3 ) 3 * 9H 2 0 in 225 ml of H 2 0; Separately, 50.9g (0.48mol) solid N3 ⁇ 4C0 3 and 38.4g (0.96mol) NaOH dissolved in 225ml water, prepared according to example step a 1 is obtained by Mg-Al-LDHs, which Mg ⁇ / a: 1 .
  • Step B Add 3.0 g of LDHs to a container containing 100 ml of deionized water, magnetically stir at room temperature, and add 6.5 g of excess phosphoric acid. At this time, the turbid liquid in the container becomes a clear solution.
  • Step C According to the method of Step C in Example 1, a Mg-Al type hydrotalcite pillar material with interlayer anions was prepared.
  • the backmixed precipitation method is used to assemble the LDHs into the layer, and the Mg-Al type hydrotalcite pillar material with interlayer anions as molecules is obtained.
  • the pillar prepared by the backmixed precipitation method is diluted with dilute hydrochloric acid. Material, no air bubbles, indicating that although the LDHs layered pillar material prepared by this method does not use N 2 gas protection, there is no C0 3 2 -ion between the layers, so this synthesis method is better than C0 3 2 -Defects in which ions and guest ions coexist between layers.
  • Step B Add 3.0 g of LDHs to a container containing 100 ml of deionized water and stir magnetically at room temperature. An excess of 5.5 g of malic acid was added, and the vessel changed from a turbid liquid to a clear solution.
  • Step C According to the method of Step C in Example 1, a Zn-Al type hydrotalcite pillar material with an interlayer anion of tartaric acid was prepared.

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

Description

一种阴离子型超分子插层结构材料的组装方法 所属领域
本发明涉及一种阴离子型超分子结构层柱材料的插层组装方法。 背景
双金属复合氢氧化物又称之为水滑石 (Layered Double Hydroxides, 简写为 LDHs) 具有插层组装的性能, 利用此性能可得到各种不同阴离子型超分子结构层 柱材料。 插层组装的方法有共沉淀法、 离子交换法、 结构复原法。
文献 [Nicolar J.Whitlton, Paula J.Vickers, Sterhen Mann, J.Mater.Chem., 1997, 7(8): 1623-1629]采用共沉淀方法, 将谷氨酸溶解在 NaOH溶液中生成谷氨酸钠盐, 用 Mg、 A1硝酸盐溶液在 N2气保护下滴加谷氨酸钠盐, 制备得到谷氨酸柱撑水滑石。 但是在制备过程中,因为 LDHS m C03 2-有最高的亲和性,必须采用 N2气保护, 以避免 C03 2-与客体谷氨酸在层间共存, 从而制得层间客体纯净(即层间只有谷氨 酸阴离子) 的 LDHs层柱材料。 该方法的不足之处是得到的层柱材料仍有 N03-与 谷氨酸共存于层间, 舰用 N2气保护操作复杂 。
文献 [孙幼松, 矫庆泽, 赵芸, 段雪, 无机化学学报, 2001, 17 (3 ): 41 418] 采用离子交换法, 将 LDHs中的 C03 2-离子置换出来, 得到层间客体为己二酸的层 柱材料, 而不需 ^气保护。 其不足之处是采用这种制备方法, 为了尽可能的全部 去除层间 C03 2-离子而不破坏 LDHs的层板, 需控制 pH值在 4.5-5之间, 工艺条 件比较苛刻。
文献 [V.Prevot, C. Forano and J.P.Besse, Inorg. Chem., 1998,37,4293-4301]采 用结构复原法, 在 N2气保护下, 得到层间客体为有机大分子的层柱材料, 其 不足之处是得到的材料有大量无定型相存在。 发明内容 本发明目的是: 根据 LDHs层柱材料的合成原理, 采用一种新的插层组装合 成方 ¾ ~~返混沉淀法, 将特定的客体分子插入 LDHs层间, 制备晶体晶相单一、 结构一致、 层间客体纯净的插层结构 LDHs材料。 所谓返混沉淀法是将已经合成 的 C03-LDHs与酸返混, 生成盐, 得到的盐再与碱共沉淀生成插层水滑石。
本发明的反应机理是:
1. (M2+ (M3+„ .4¾0 + > - -(M2+)I( A)2 +- ( 3+)x(A)b + Άβ + CO,
2. - -( M2+)s( A)2 + ^ί \(Κ +雇 aOH >"
.4¾0 + ψΝ Α
Figure imgf000003_0001
其中: Μ2+代表 Mg2+、Ni 2+、Zn2+、 Fe2+或 Cu2+二价金属离子, M3+代表 Co3+、 Fe3+、 Ti3+、 Al3+或 Ga3+三价金属离子, AHx代表无机酸或有机酸客体分子, 该客 体分子应具有一定的水溶解度, 且水溶液的 pH值小于 4; A代表 Cl S04 2 N03\ P04 3-等无机酸酸根离子或酒石酸、 谷氨酸、 天冬氨酸、 柠檬酸、 苹果酸、 苯甲酸、 对氨基苯甲酸、 己二酸等有机酸酸根离子; [M2+ 6M3+ 2(OH)16](C03) .4 0为层间阴 离子为 CO/-离子水滑石 (C03-LDHs)的结构式; [M2+ 6M3+ 2(OH)16] (A) ^ .4¾0为 层间阴离子是 A离子的插层水滑石 (A-LDHs); (M2+) X(A)2)、 (M3+) X(A)3分别为 二价和三价金属离子的盐。
通过上述 C03-LDHs与酸反应生成盐,再与 NaOH共沉淀,使阴离子 A取代 C03 2- 离子生成层间阴离子为 A的插层水滑石。 " ·.
该插层组装方法的优点是, 一方面在机理反应式 2中, 用反应式 1生成的盐滴 入 NaOH中, 使反应 pH>9 的条件下容易控制; 另一方面, 用这种方法制备的插 层结构 LDHs材料虽然没有采用 ^气保护, 但层间没有 C03 2-离子, 讓地克服了 CO/-离子与客体离子在层间共存的缺陷。
具体操作步骤如下: A. 采用专利 (见专利申请 00132145.5)方法制备所需 C03-LDHs, 其层板二 价、三价阳离子摩尔比 M2 M3+=2-4: 1,优选 M2+为 Μ^+、 Ζη2+, Μ3+为 Al3+、 Fe3+
B.将一定量的 LDHs加入到盛有去离子水的容器中,室温下磁力搅拌,按 LDHs 与客体完全反应计, 加入过量客体, 此时容器中由浑浊液变为澄清溶液, 备用。
客体为具有一定的水溶解度, 且其水溶液 pH<4 的无机酸或有机酸, 如盐酸、 碳酸、 硝酸、 磷酸、 酒石酸、 谷氨酸、 天冬氨酸、 柠檬酸、 苹果酸、 苯甲酸、 对 氨基苯甲酸、 己二酸等。
C. 配制浓度为 0.01-0.5M的 NaOH水溶液加入带冷凝和搅拌的反应器中, 一 边搅拌, 一边滴加步骤 B得到的澄清溶液, 保持滴加过程 pH〉9, 滴加结束, 7令凝 回流约 6h, 过滤、 用热水充分洗涤至 pH<8, 大约在 85°C左右干燥 24h, 插层组装 得到客体柱撑层柱材料 A-LDHso
将以上材料进行 XRD、 IR、 元素分析表征显示, 客体分子已组装进入了层状 材料 LDHs层间, 得到晶体晶相单一、 结构一致的客擁层结构 LDHs材料。
用稀盐酸滴定返混沉淀法制备的层柱材料, 没有气泡产生, 说明用这种方法制 备的插层结构 LDHs材料虽然没有采用 >12气保护, 但层间没有 C03 2_离子, 所以这 种合成方法较好的克服了 C03 2 -离子与客体离子在层间共存的缺陷。 具体实 式
实施例 1
步骤 A: 将 61.5g (0.24mol)的固体 Mg (N03) 2 · 6H20和 45.0g(0.12mol)的固 体 Al (Ν03) 3 · 9Η20溶于 225ml的 0中;另将 253g(0.24mol)的固体 N¾C03和 23.0g(0.58mol)NaOH溶于 225ml的水中, 室温下迅速将碱溶液和盐溶液于旋转液 膜反应器中成核, 将得到的浆液 100°C晶化 6小时, 离心分离, 将得到的样品洗涤 至 pH值小于 8, 70 °C干燥 24小时, 得到 Mg-Al-LDHs, 其 Mg^/A +^: 1。
步骤 B: 4.0g LDHs加入到盛有 100ml去离子水的容器中, 室温下磁力搅拌, 加入过量谷氨酸 7.5g, 此时容器中由浑浊液变为澄清溶液。
步骤 C: 用 100ml纯水在容器中溶解 2g NaOH, 然后倒入带冷凝和搅拌的反 应器中, 一边搅拌, 一边滴加步骤 B中澄清溶液, 保持滴加过程 pH>9, 滴加结束, 冷凝回流 6h, 过滤、 用热水充分洗涤至 pH<8, 大约 85°C左右干燥 241ι, 插层组装 得到谷氨酸插层结构 LDHs材料。 o
由 X射线衍射图可知, 制备得到的谷氨酸插层结构 LDHs材料其特征衍射峰 向小角度移动, 在 2Θ=7.6° 处出现层间距为(3^=1.2:101 (大于步骤 Α制备的样品 ά,^Ο.Ίβητη 的特征衍射峰; IR谱图显示, 制备得到的谷氨酸插层结构 LDHs材 料其 ^ cn 1处 C03 2_峰消失,代之分别在 1594cm-1处出现 N-H弯曲振动,在 1405、 1356cm-1处出现羧酸根离子的不对称和对称吸收谱带。 实验证明: 釆用返混沉淀方 法将谷氨酸组装进入 LDHs层间, 得到层间阴离子为谷氨酸分子的 Mg-Al型水 滑石层柱材料。 用稀盐酸滴定返混沉淀法制备的层柱材料, 没有气泡产生, 说明 用这种方法制备的 LDHs层柱材料虽然没有采用 ^气保护,但层间没有 CO/-离子, 所以这种合成方法较好的克服了 CO 离子与客体离子在层间共存的缺陷。 实施例 2
步骤 A: 将 92.3g (0.36mol)的固体 Mg (N03) 2 · 6 0和 45.0g(0.12mol)的固 体 Al (N03) 3 * 9H20溶于 225ml的 H20 中;另将 38.2g(0.36mol)的固体 Na2C03和 30.7g(0.77mol)NaOH溶于 225ml的水中, 按实施例 1 中步骤 A的方法制备得到 Mg-Al-LDHs, 其 Μ^+/Α13+=3: 1 。
步骤 B: 3.0g LDHs加入到盛有 100ml去离子水的容器中, 室温下磁力搅拌, 加入过量乳酸 6.5g, 此时容器中由浑浊液变为澄清溶液。
步骤 C: 按实施例 1中步骤 C方法制备得到层间阴离子为酒石酸的 Mg-Al 型水滑石层柱材料。
由 X射线衍射图可知, 制备得到的乳酸插层结构 LDHs材料其特征 ί行射峰 向小角度移动, 在 2Θ=7.6° 处出现层间距为(^3=1.2腿(大于步骤 Α制备的样品 (^=0.7611111) 的特征衍射峰; IR谱图显示, 制备得到的乳酸插层结构 LDHs材料 其 1377cm-1处 C03 2-峰消失, 代之分别在 1587、 B^cm-1处出现羧酸根离子的不对 称和对称吸收谱带。 实验证明: 采用返混沉淀方法将乳酸组装进入 LDHs层间, 得到层间阴离子为乳酸分子的 Mg-Al型水滑石层柱材料。 用稀盐酸滴定返混沉 淀法制备的层柱材料, 没有气泡产生, 说明用这种方法制备的 LDHs层柱材料虽 然没有采用 ^气保护,但层间没有 co3 2-离子,所以这种合成方法较好的克服了 co3 2- 离子与客体离子在层间共存的缺陷。 实施例 3
步骤 A: 将 123.1g (0.48mol)的固体 Mg (N03) 2 · 6H20和 45.0g(0.12mol)的固 体 Al (N03) 3 * 9H20溶于 225ml的 H20中;另将 50.9g(0.48mol)的固体 N¾C03和 38.4g(0.96mol)NaOH溶于 225ml的水中, 按实施例 1 中步骤 A的方法制备得到 Mg-Al-LDHs, 其 Mg^/A : 1 。
步骤 B: 3.0g LDHs加入到盛有 100ml去离子水的容器中, 室温下磁力搅拌, 加入过量磷酸 6.5g, 此时容器中由浑浊液变为澄清溶液。
步骤 C: 按实施例 1中步骤 C方法制备得到层间阴离子为的 Mg-Al型水滑 石层柱材料。
由 X射线衍射图可知, 制备得到的插层结构 LDHs材料其特征衍射峰向小角 度移动, 在 2Θ=7.3 ° 处出现层间距为 0^=1.211111 (大于步骤 Α 制备的样品 (3^=0.761^1) 的特征衍射峰; IR谱图显示, 制备得到的插层结构 LDHs材料其 1377cm"1处 C03 2—峰消失, 代之在 1260、 1084、 1018cm"1处出现根离子的不对称和 对称吸收谱带。 实验证明: 采用返混沉淀方法将组装进入 LDHs层间, 得到层间 阴离子为分子的 Mg-Al 型水滑石层柱材料。 用稀盐酸滴定返混沉淀法制备的层 柱材料, 没有气泡产生, 说明用这种方法制备的 LDHs层柱材料虽然没有采用 N2 气保护, 但层间没有 C03 2-离子, 所以这种合成方法较好的克月艮了 C03 2-离子与客体 离子在层间共存的缺陷。 实施例 4
步骤 A: 将 69.1g (0.24mol)的固体 ZnS04.7H20和 50.0g(0.075mol)的固体 Al2 ( S04 ) 3·18Η20溶于 225ml 的 H20 中;另将 26.4g(0.24mol)的固体 Na2C03和 26.5g(0.65mol)NaOH溶于 225ml的水中, 按实施例 1 中步骤 A的方法制备得到 Zn-Al-LDHs, 其 Ζη2+/Α13+=1·6: 1 。
步骤 B: 3.0g LDHs加入到盛有 100ml去离子水的容器中, 室温下磁力搅拌, 加入过量苹果酸 5.5g, 此时容器中由浑浊液变为澄清溶液。
步骤 C: 按实施例 1中步骤 C方法制备得到层间阴离子为酒石酸的 Zn-Al型 水滑石层柱材料。
由 X射线衍射图可知, 制备得到的苹果酸插层结构 LDHs材料其特征衍射峰 向小角度移动, 在 2Θ=7.6° 处出现层间距为 do l^iim (大于步骤 A制备的样品 (^3=0.76腿) 的特征衍射峰; JR谱图显示, 制备得到的苹果酸插层结构 LDHs材 料其 1377( 1^处( 03 2-峰消失, 代之分别在 1587、 1390cm-1处出现羧酸根离子的不 对称和对称吸收谱带。 实验证明: 采用返混沉淀方法将苹果酸组装进入 LDHs层 间, 得到层间阴离子为苹果酸分子的 Zn-Al型水滑石层柱材料。 用稀盐酸滴定 返混沉淀法制备的层柱材料, 没有气泡产生, 说明用这种方法制备的 LDHs层柱 材料虽然没有采用 ^气保护, 但层间没有 C03 2-离子, 所以这种合成方法较好的克 服了 CO 离子与客体离子在层间共存的缺陷。

Claims

权 利 要 求 书
1. 一种阴离子型超分子插层结构材料的组装方法, 该方法包括下列步骤:
A. 制备层间阴离子均为 C03-,且层板二价、三价阳离子摩尔比 M27M3+=2— 4: 1的水滑石 C03-LDHs;
B. 将一定量的 C03-LDHs加入到盛有去离子水的容器中, 室温下磁力搅拌, 按 C03-LDHs与客体完全反应计, 加入过量客体, 此时容器中由浑浊液变为澄清 溶液, 备用, 客体是具有一定的水溶解度, 且其水溶液 pH<4的无机酸或有机酸;
C. 配制浓度为 0.01-0.5M的 NaOH水溶液加入带冷凝和搅拌的反应器中, 一 边搅拌, 一边滴加步骤 B得到的澄清溶液, 保持滴加过程 pH〉9, 滴加结束, 冷凝 回流约 6h, 过滤、 用热水充分洗涤至 pH<8, 大约在 85°C左右干燥 24h, 插层组装 得到客体柱撑 LDHs层柱材料。
2. 根据权利要求 1所述的插层组装方法, 其特征是客体分子优选盐酸、 硫酸、 硝酸、 磷酸、 酒石酸、 谷氨酸、 天冬氨酸、 柠檬酸、 苹果酸、 苯甲酸、 对氨基苯 甲酸或己二酸。
3. 根据权利要求 1所述的插层组装方法, 其特征是 C03-LDHs主体层板二价 金属阳离子 M2+可以是 Mg^ 、 Ni 2+ 、 Zn2+ 、 Fe2+或 Cu2+, 三价金属阳离子 M3+ 可以是 Co3+、 Fe3+、 Ti3+、 Al3+或 Ga3+
4. 根据权利要求 1所述的插层组装方法, 其特征是 C03-LDHs主体层板二价 金属阳离子 M2+优选 Mg^或 Zn2+; 三价金属阳离子 M3+优选 Al3+或 Fe3+
PCT/CN2002/000754 2002-06-24 2002-10-25 Procede d'assemblage de materiau a structure d'intercalation de supermolecule anionique Ceased WO2004000757A1 (fr)

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CN103638905A (zh) * 2013-11-28 2014-03-19 沈阳化工大学 一种利用酒石酸插层水滑石吸附重金属的方法
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