Cationic aluminoxa-molecular cage crystal state and its preparation method and use

Abstract

The application provides a cationic aluminoxa molecular cage crystal state and a preparation method and application thereof, and the molecular formula of the cationic aluminoxa molecular cage crystal state is [Al 24 (A) 12 (μ2‑B) 24 (μ2‑OH) 24 (μ3‑OH)8] m+ ·(C n ) m‑ , wherein μ2‑OH represents a two-connected hydroxyl group, μ3‑OH represents a three-connected hydroxyl group, μ2‑B represents a two-connected B ligand, A is the same or different and is independently selected from the residue of a C1-C40 organic acid, B is the same or different and is independently selected from the residue of a C1-C40 organic alcohol, C is the same or different and is independently selected from a free guest molecule or ion, n is the number of the guest molecule or ion, and is an integer or a decimal number between 1 and 30, and m is 4. The material enriches the structure type of aluminoxa clusters and widens the application prospect of aluminoxa cluster materials. The preparation method has simple process requirements, short reaction time, is convenient for large-scale production, has simple and easy post-treatment, has little pollution in the preparation process, and meets the green and environmental protection requirements.

Description

Technical Field

[0001] This invention belongs to the field of crystal material preparation technology, specifically relating to an aluminum oxide molecular cage crystalline material, its preparation method, and its applications. Background Technology

[0002] Aluminum is the third most abundant element in the shallow Earth's crust and a crucial component in many industrial processes. Numerous aluminum-based materials, such as alumina, aluminum hydroxide, and boehmite, have been synthesized through geochemical reactions. These are widely used in water treatment, catalysis, aerospace, and other fields. In recent years, crystalline aluminum oxide clusters (AlOCs) have attracted considerable attention from researchers. Their precise atomic structure and diverse structural types allow for the simulation and study of aluminum oxides at the molecular level. Currently, a large number of plate-like, cyclic, and tetrahedral aluminum oxide clusters have been developed, demonstrating potential applications in molecular assembly, environmental pollutant adsorption, and proton conduction.

[0003] As a class of porous materials, cage-like compounds have great application prospects in gas adsorption, recognition, and industrial catalysis. Currently, a large number of molecular cages constructed from transition metals (Zn, Co, Fe, Pd, Ti, Zr) and rare earth elements (Ln) have been synthesized, but the preparation and structure of cage-like aluminum-oxygen clusters have not yet been reported. Therefore, it is necessary to develop synthetic methods and structural types of aluminum-oxygen molecular cages and explore their potential applications. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a cationic aluminum oxide molecular cage crystalline material, its preparation method, and its applications.

[0005] The present invention proposes the following technical solution:

[0006] This invention provides an aluminum oxide molecular cage crystalline material, the molecular formula of which is:

[0007] [Al 24 (A) 12 (μ2-B) 24 (μ2-OH) 24 (μ3-OH)8] m+ ·(C n ) m-

[0008] Wherein, μ2-OH represents a di-linked hydroxyl group, μ3-OH represents a tri-linked hydroxyl group, and μ2-B represents a di-linked B ligand;

[0009] A residues of organic acids that are the same or different from each other and are independently selected from C1-C40;

[0010] B are the same or different residues of organic alcohols selected independently from C1-C40;

[0011] C may be the same or different, and they are independently selected from free guest molecules or ions;

[0012] n is the number of guest molecules or ions, which is an integer or decimal between 1 and 30;

[0013] m is 4.

[0014] According to the present invention, in the aluminum oxide molecular cage crystalline material, μ2-OH, μ3-OH, μ2-B, A and Al constitute a positively charged aluminum oxide molecular cage.

[0015] According to the present invention, μ2-OH represents two Al atoms bridging coordination with the 2-coordinated O atoms in the hydroxyl group; μ3-OH represents three Al atoms bridging coordination with the 3-coordinated O atoms in the hydroxyl group; and μ2-B represents two Al atoms bridging coordination with the 2-coordinated O atoms in the B group.

[0016] According to the present invention, the A residues, whether identical or different, are independently selected from at least one of benzoic acid residues or benzoic acid residues containing substituents. Preferably, the A residues are selected from benzoic acid residues or benzoic acid residues containing a substituent at the 2-position.

[0017] According to the present invention, the "substituent" is a conventional substituent in the art, such as selected from hydroxyl, C 1-6 Alkyl, C 1-6 Alkoxy, amino, nitro, carboxyl, phenyl, halogen atom, preferably hydroxyl, methyl, amino or halogen atom, more preferably halogen atom.

[0018] For example, the A residues may be the same or different and are independently selected from at least one of the following: residues of benzoic acid, residues of 2-fluorobenzoic acid, residues of 2-chlorobenzoic acid, residues of 2-bromobenzoic acid, residues of 2-iodobenzoic acid, residues of 2-methylbenzoic acid, and residues of 2-hydroxybenzoic acid, preferably residues of benzoic acid.

[0019] According to the present invention, the B residues are the same or different and are independently selected from residues of organic alcohol compounds containing 1-40 carbon atoms; preferably, they are selected from residues of organic alcohol compounds containing 1-4 carbon atoms; more preferably, they are selected from residues of organic alcohol compounds containing 1-3 carbon atoms; and even more preferably, they are selected from residues of organic alcohol compounds containing 1-2 carbon atoms.

[0020] According to the present invention, the B residues are the same or different and are independently selected from at least one of the following: residues of ethanol, n-propanol, n-butanol, isopropanol, tert-butanol, sec-butanol, ethylene glycol, benzyl alcohol, phenol, and 1,5-pentanediol; preferably residues of ethanol.

[0021] According to the present invention, preferably, n is an integer between 1 and 30; more preferably, it is an integer between 1 and 6; even more preferably, it is an integer between 1 and 4; and even more preferably, it is an integer between 1 and 2.

[0022] According to the present invention, the C is the same or different and is independently selected from at least one of nitrate, sulfate, phosphate, water molecule, ethanol molecule, n-propanol molecule, ethanol salt, n-propanol salt, halide ion, cluster molecule, and cluster ion; preferably at least one of nitrate, water molecule, and ethanol molecule.

[0023] It should be noted that, in this invention, the "cluster" refers to a relatively stable microscopic or submicroscopic aggregate composed of several or even thousands of atoms, molecules, or ions bound together by physical or chemical forces, and its physical and chemical properties vary with the number of atoms it contains. Preferably, if the cluster is electrically neutral, it is a cluster molecule. Preferably, if the cluster carries a positive or negative charge, it is a cluster ion. Preferably, the cluster molecule or ion is, for example, at least one of polyacids, gold nanoclusters, silver nanoclusters, titanium oxide clusters, aluminum oxide clusters, and rare earth clusters.

[0024] According to the present invention, C is in a free state within the aluminum oxide molecular cage. Preferably, the free C exists on the interior and / or exterior surfaces of the aluminum oxide molecular cage.

[0025] According to the present invention, the aluminum oxide molecular cage crystalline material is a pure-phase colorless blocky crystalline material.

[0026] According to the present invention, the aluminum oxide molecular cage crystalline material is an organic-inorganic hybrid compound.

[0027] According to the present invention, the cluster size of the aluminum oxide molecular cage crystal is 1.9 ± 0.8 nm, for example, 1.9 nm or 1.98 nm.

[0028] According to the present invention, the aluminum oxide molecular cage crystalline material has a symmetrical structure.

[0029] According to the present invention, the aluminum oxide molecular cage crystal is a 24-nuclear cluster, the periphery of which is obtained by coordination of A and B. Preferably, the aluminum oxide molecular cage crystal has six faces on its periphery. Preferably, at least one C is trapped on at least one face of the periphery of the aluminum oxide molecular cage crystal.

[0030] For example, the aluminum oxide molecular cage crystal comprises six faces, each face of which traps one carbon atom, which includes two water molecules, two nitrate ions, and two ethanol molecules. Furthermore, two nitrate guests may also be trapped inside the molecular cage.

[0031] According to the present invention, the molecular formula of the aluminum-oxygen molecular cage crystalline material is:

[0032] [Al 24 (A) 12 (μ2-B) 24 (μ2-OH) 24 (μ3-OH)8] 4+ ·(C n ) 4-

[0033] In this context, A represents benzoic acid residues; B represents ethanol residues; and C includes four nitrate ions, two ethanol molecules, and two water molecules.

[0034] It should be noted that, in this invention, the residue refers to the group remaining after removing all the hydrogens from the carboxyl groups of an organic acid or the group remaining after removing one hydrogen from the O group of an organic alcohol.

[0035] According to an exemplary embodiment of the present invention, the molecular formula of the aluminum-oxygen molecular cage crystalline material is Al 24 (C7H5O2) 12 (μ2-C2H5O) 24 (μ2-OH) 24 (μ3-OH)8] 4+ (NO3) - 4·(H₂O)₂·(EtOH)₂(Al) 24 C 136 O 96 H 228 N4), denoted as aluminum oxide molecular cage crystalline material a, wherein the crystal system of aluminum oxide molecular cage crystalline material a is monoclinic, the space group is C2 / c, and the cell parameter a is b is c is α is 90°, β is 103.34°, γ is 90°, and V is...

[0036] According to the present invention, the relative molecular mass Mr of the aluminum oxide molecular cage crystalline material is 4102.73.

[0037] According to the present invention, the aluminum oxide molecular cage crystalline material a has substantially the following properties: Figure 3 The X-ray powder diffraction pattern shown.

[0038] According to the present invention, the crystal parameters of the aluminum-oxygen molecular cage crystalline material a are shown in Table 1 by single-crystal X-ray analysis:

[0039] Table 1

[0040]

[0041] This invention also provides a method for preparing the above-mentioned aluminum oxide molecular cage crystalline material, the method comprising the following steps: mixing aluminum salt, organic acid, organic alcohol, and free guest as reactants, reacting under heating conditions to prepare the aluminum oxide molecular cage crystalline material.

[0042] Wherein, the residues of the organic acid form A in the molecular formula, the organic alcohol forms B in the molecular formula, and the guest forms C in the molecular formula.

[0043] According to the present invention, the method specifically includes the following steps:

[0044] 1) The aluminum salt, organic acid, organic alcohol and guest are mixed and subjected to a solvothermal reaction to obtain a mixture;

[0045] 2) Separate the mixture obtained after the reaction in step 1) to obtain the crystalline product, which is the aluminum oxide molecular cage crystalline product.

[0046] According to the present invention, the aluminum salt is selected from compounds formed by removing hydrogen from the hydroxyl group of an alcohol by reacting aluminum ions with the alcohol.

[0047] According to the present invention, the aluminum salt is selected from at least one of aluminum ethoxide, aluminum n-propoxide, aluminum isopropoxide, aluminum n-butoxide, aluminum sec-butoxide, and aluminum tert-butoxide, preferably aluminum isopropoxide.

[0048] According to the present invention, the organic acid is selected from benzoic acid and / or benzoic acid containing substituents.

[0049] According to the present invention, in the substituted benzoic acid, the substituent is selected from 2-hydroxy, 2-C... 1-6 Alkyl, 2-C 1-6 Alkyl group, 2-halogen atom.

[0050] Preferably, the organic acid is selected from at least one of benzoic acid, 2-fluorobenzoic acid, 2-chlorobenzoic acid, 2-bromobenzoic acid, 2-iodobenzoic acid, 2-hydroxybenzoic acid, 2-methylbenzoic acid, etc., and is preferably benzoic acid.

[0051] According to the present invention, the organic alcohol is selected from organic alcohols containing 1 to 40 carbon atoms.

[0052] Preferably, the organic alcohol is selected from at least one of ethanol, n-propanol, n-butanol, isopropanol, tert-butanol, sec-butanol, ethylene glycol, benzyl alcohol, phenol, and 1,5-pentanediol, with ethanol being the most preferred.

[0053] According to the present invention, the object is selected from at least one of the following substances: nitric acid, nitrate, sulfuric acid, sulfate, phosphoric acid, phosphate, water, ethanol, n-propanol, ethanol salt, n-propanol salt, halide ion, cluster molecule, cluster ion, preferably nitric acid, nitrate, water, or ethanol.

[0054] According to the present invention, the molar ratio of the aluminum salt to the organic acid is 1:(0.01-10), for example 1:(0.1-5), specifically 1:(0.2-3).

[0055] According to the present invention, the molar ratio of the aluminum salt to the organic alcohol is 1:(0.01-50), for example 1:(1-40), specifically 1:(10-30).

[0056] According to the present invention, the molar ratio of the aluminum salt to the guest is 1:(0.01-100), for example 1:(0.1-80), specifically 1:(1-50).

[0057] According to the present invention, the temperature of the heating reaction (solvothermal reaction) is 50–150°C; preferably 70–120°C, for example 85–110°C, such as 100°C. If the reaction temperature is too low, the reaction time will be longer and the crystal size will be smaller.

[0058] According to the present invention, the heating reaction (solvothermal reaction) time is 24 to 240 hours; preferably 36 to 180 hours, such as 72 hours or 96 hours.

[0059] For example, the heating reaction can be carried out at 80°C for 120 hours or 144 hours, or at 100°C for 72 hours or 96 hours.

[0060] According to the present invention, step 1) specifically includes: mixing the aluminum salt, organic acid, organic alcohol and guest, stirring, reacting at a constant temperature, and then cooling to room temperature.

[0061] Preferably, the isothermal reaction refers to a reaction that is allowed to stand at a constant temperature, such as heating an aluminum salt, organic acid, organic alcohol, and guest in an oven.

[0062] According to the present invention, in step 2), the separated crystalline material is washed and dried.

[0063] Preferably, the separated crystalline material is washed with water or alcohol and then air-dried at room temperature. The alcohol may be methanol, ethanol, or n-propanol.

[0064] The present invention also provides an aluminum oxide molecular cage crystalline material obtained by the above preparation method.

[0065] The present invention also provides the use of the above-mentioned aluminum oxide molecular cage crystals, which can be used for the adsorption and separation of iodide ions in water, and is preferably used for the desalination of polluted seawater.

[0066] Beneficial effects

[0067] This invention provides a novel material, namely a cationic aluminum oxide molecular cage crystal, and also provides its applications; the cationic aluminum oxide molecular cage crystal enriches the structural types of aluminum oxide clusters and broadens the application prospects of aluminum oxide cluster materials.

[0068] The method for preparing cationic aluminum oxide molecular cage crystalline products of the present invention is simple, efficient, and has a short reaction time, making it suitable for large-scale production. Furthermore, the post-processing of this method is simple, requiring only washing, separation, and natural drying to obtain the crystalline product. Simultaneously, the raw materials used in this method are low in toxicity and cost, produce minimal pollution, and meet green environmental protection requirements.

[0069] The aluminum-oxygen molecular cage crystals of the present invention have highly efficient iodine adsorption properties and can be used for desalination of polluted seawater. Attached Figure Description

[0070] Figure 1 This is a schematic diagram of the crystal structure of the crystalline material prepared in Example 1;

[0071] Figure 2 This is a schematic diagram of the crystal structure of the crystalline material prepared in Example 2;

[0072] Figure 3 The images show the X-ray powder diffraction patterns of the crystalline material prepared in Example 1; where "simulated pattern" is the X-ray powder diffraction pattern obtained by simulating the crystal structure; and "experimental pattern" is the X-ray powder diffraction pattern obtained by testing on an X-ray powder diffractometer.

[0073] Figure 4 The infrared spectrum of the crystalline material prepared in Example 1;

[0074] Figure 5 The image shows the ultraviolet spectrum of the crystalline material prepared in Example 1;

[0075] Figure 6 This is a photograph of the crystalline material prepared in Example 1 used for iodine adsorption in the aqueous phase. Detailed Implementation

[0076] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanatory of the present invention, and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0077] Unless otherwise stated, the raw materials and reagents used in the following examples are commercially available products or can be prepared by known methods.

[0078] The single-crystal structure analysis of this invention was performed using Rigaku's Supernova single-crystal diffractometer from Japan.

[0079] The X-ray source used in the powder diffraction pattern was Cu-Kα rays.

[0080] Example 1

[0081] 1. Preparation of alumina molecular cage crystalline material a(Al 24 C 136 O 96 H 228 N4)

[0082] The specific preparation method is as follows: Aluminum isopropoxide (6 mmol), benzoic acid (3 mmol), nitric acid (5.56 mmol), ethanol (137 mmol), and water (0.0028 mmol) were placed in a 20 ml glass bottle and mixed thoroughly at room temperature. The mixture was then kept at 100°C for 3 days. After removal, it was allowed to cool naturally to room temperature. The solid phase was separated, washed with ethanol, and then naturally dried in air to obtain the colorless, blocky crystalline target product, aluminum oxide molecular cage crystal a(Al). 24 C 136 O 96 H 228 N4). Yield is approximately 50% (based on the mass of aluminum isopropoxide).

[0083] 2. Aqueous phase iodine adsorption test

[0084] Take 2 mg of the aluminum oxide molecular cage crystal a prepared above and 2 mL of saturated I2 aqueous solution and place them in a 4 mL glass bottle. Mix them at room temperature, let them stand to adsorb, separate the solid phase and wash with distilled water to obtain the iodine-adsorbed crystals.

[0085] Example 2

[0086] Preparation of aluminum oxide molecular cage crystal b: The specific preparation method is basically the same as in Example 1, except that ethanol (137 mmol) and water (0.0028 mmol) are replaced with n-propanol (107 mmol).

[0087] from Figure 1 As can be seen, the aluminum-oxygen molecular cage crystal a has 24 aluminum atoms, with benzoate and ethanol salt as the outer ligands. There are two nitrate guests inside the cage, and two nitrate guests, two water molecules, and two ethanol molecules on the six faces outside the cage.

[0088] from Figure 2As can be seen, the aluminum-oxygen molecular cage crystal b has 24 aluminum atoms. The ethanol salt outside the molecular cage is replaced with n-propanol salt, that is, the outer ligands are benzoate and n-propanol salt. There are two nitrate guests inside the cage, and the six outer guests are replaced with two nitrates and four n-propanol molecules.

[0089] The aluminum oxide molecular cage crystalline material a prepared in Example 1 above was subjected to X-ray powder diffraction, infrared spectroscopy, and ultraviolet spectroscopy tests respectively:

[0090] from Figure 3 As can be seen from the X-ray powder diffraction pattern of the aluminum-oxygen molecular cage crystalline material a, it is consistent with the theoretical simulation. The aluminum-oxygen molecular cage crystalline material a has high purity (95%) and is stable in air. Its crystal parameters are as follows: the crystal system of the aluminum-oxygen molecular cage a is monoclinic, the space group is C2 / c, and the cell parameter a is... b is c is α is 90°, β is 103.34°, γ is 90°, and V is...

[0091] from Figure 4 It can be seen that the aluminum oxide molecular cage crystalline material a has obvious vibrational peaks of organic carboxylic acids and organic alcohols;

[0092] from Figure 5 It can be seen that the band gap of aluminum oxide molecular cage crystalline material a is 4.25 eV.

[0093] from Figure 6 As can be seen from the data, the aluminum oxide molecular cage crystalline material a exhibits significant iodine adsorption behavior; after adding a saturated I₂ aqueous solution to the crystalline material, it completely turns black within half an hour (see [reference]). Figure 6 (Photograph of the upper half); the color of the saturated I2 aqueous solution became clear after 5 hours (see...). Figure 6 (The lower half of the photo).

[0094] The exemplary embodiments of the present invention have been described above. However, the scope of protection of this application is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A type of aluminum oxide molecular cage crystalline material, characterized in that, The molecular formula of the aluminum oxide molecular cage crystalline material is: [Al 24 (A) 12 (μ2-B) 24 (μ2-OH) 24 (μ3-OH)8] m+ ·(C n ) m- , Wherein, μ2-OH represents a di-linked hydroxyl group, μ3-OH represents a tri-linked hydroxyl group, and μ2-B represents a di-linked B ligand; A is selected from residues of benzoic acid; B may be the same or different, and is independently selected from at least one of the following residues: ethanol residue, n-propanol residue, n-butanol residue, isopropanol residue, tert-butanol residue, and sec-butanol residue. C may be the same or different, and may be selected independently from nitrate, water and ethanol molecules, or from nitrate and n-propanol molecules; n is the number of guest molecules or ions, which is an integer or decimal between 1 and 30; m is 4.

2. The aluminum oxide molecular cage crystalline material according to claim 1, characterized in that, n is an integer between 1 and 30.

3. The aluminum oxide molecular cage crystalline material according to claim 1, characterized in that, The aluminum oxide molecular cage crystalline material is a pure-phase colorless blocky crystalline material; The aluminum oxide molecular cage crystalline material is an organic-inorganic hybrid compound; The cluster size of the alumina molecular cage crystalline material is 1.9 ± 0.8 nm; The aluminum oxide molecular cage crystalline material has a symmetrical structure; The aluminum oxide molecular cage crystalline material is a 24-nucleus cluster, which is obtained by A and B coordination around its periphery; The aluminum oxide molecular cage crystal has six faces; at least one C is trapped on at least one face of the aluminum oxide molecular cage crystal.

4. The aluminum oxide molecular cage crystalline material according to claim 1, characterized in that, The molecular formula of the aluminum oxide molecular cage crystalline material is: [Al 24 (A) 12 (μ2-B) 24 (μ2-OH) 24 (μ3-OH)8] 4+ ·(C n ) 4- , In this context, A represents benzoic acid residues; B represents ethanol residues; and C includes four nitrate ions, two ethanol molecules, and two water molecules.

5. The aluminum oxide molecular cage crystalline material according to claim 1, characterized in that, The molecular formula of the aluminum oxide molecular cage crystalline material is Al 24 C 136 O 96 H 228 N4, denoted as aluminum-oxygen molecular cage crystalline material a, wherein the crystal system of aluminum-oxygen molecular cage crystalline material a is monoclinic and the space group is C2 / c Cell parameters a It is 23.09 Å. b It is 28.81 Å. c It is 32.05 Å. α For 90 o , β It is 103.34 o , γ For 90 o V is 20740.7 Å 3 ; The relative molecular mass Mr of the aluminum oxide molecular cage crystal is 4102.

73.

6. The aluminum oxide molecular cage crystalline material according to claim 5, characterized in that, The crystal parameters of the aluminum-oxygen molecular cage crystalline material a are shown in Table 1: Table 1 。 7. The method for preparing the aluminum oxide molecular cage crystalline material according to any one of claims 1-6, characterized in that, The preparation method includes the following steps: mixing aluminum salt, organic acid, organic alcohol and free guest as reactants, reacting under heating conditions to prepare the aluminum oxide molecular cage crystal. Wherein, the residues of the organic acid form A in the molecular formula, the organic alcohol forms B in the molecular formula, and the guest forms C in the molecular formula; The aluminum salt is selected from at least one of aluminum ethoxide, aluminum n-propoxide, aluminum isopropoxide, aluminum n-butoxide, aluminum sec-butoxide, and aluminum tert-butoxide. The organic acid is selected from benzoic acid; The organic alcohol is selected from at least one of ethanol, n-propanol, n-butanol, isopropanol, tert-butanol, and sec-butanol; The object is selected from nitric acid, ethanol and water, or nitric acid and n-propanol.

8. The preparation method according to claim 7, characterized in that, The method specifically includes the following steps: 1) The aluminum salt, organic acid, organic alcohol and guest are mixed and subjected to a solvothermal reaction to obtain a mixture; 2) Separate the mixture obtained after the reaction in step 1) to obtain the crystalline product, which is the aluminum oxide molecular cage crystalline product.

9. The preparation method according to claim 7, characterized in that, The molar ratio of the aluminum salt to the organic acid is 1:0.01-10; The molar ratio of the aluminum salt to the organic alcohol is 1:0.01-50; The molar ratio of the aluminum salt to the guest is 1:0.01-100; The temperature for the heating reaction is 50~150℃; The heating reaction time is 24 to 240 hours.

10. The preparation method according to claim 7, characterized in that, The temperature for the heating reaction is 70~120℃; The heating reaction time is 36 to 180 hours.

11. The preparation method according to claim 8, characterized in that, Step 1) specifically includes: mixing the aluminum salt, organic acid, organic alcohol and guest, stirring, reacting at a constant temperature, and then cooling to room temperature; In step 2), the separated crystalline material is washed and dried; The separated crystalline material was washed with water or alcohol and then air-dried at room temperature.

12. An aluminum oxide molecular cage crystalline material, which is prepared by the method according to any one of claims 7-11.

13. Use of the alumina molecular cage crystal as described in any one of claims 1-6 or claim 12 in the adsorption and separation of iodide ions in water.

14. The use according to claim 13, characterized in that, The aforementioned aluminum-oxygen molecular cage crystals are used for the desalination of contaminated seawater.

Images