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Simple preparation method of hollow hydroxide derived from MOFs

A hydroxide, a simple technology, applied in the direction of nickel oxide/nickel hydroxide, cobalt oxide/cobalt hydroxide, etc., can solve the problems of high thermal decomposition temperature, energy waste, easy sintering and growth of material grains, and achieve Mild preparation conditions, rich preparation methods, and universal effects

Inactive Publication Date: 2018-09-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the method of thermal decomposition is widely used, it is not suitable for large-scale production and application due to its high thermal decomposition temperature, which is easy to cause waste of energy. The final material grains are easy to sinter and grow at high temperature, reducing its nanometer size. effect, and the acid-base etching method is often used when selectively removing excess substances, which is not conducive to environmental protection; in addition to thermal decomposition methods, interfacial reactions are also an effective method to control the morphology of micro-nano materials. For example, Zeng et al. and KOH aqueous solution to synthesize porous CeO 2 (Electrochimica Acta, 2016, 222: 773–780), but failed to effectively regulate hollow structural materials

Method used

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  • Simple preparation method of hollow hydroxide derived from MOFs
  • Simple preparation method of hollow hydroxide derived from MOFs
  • Simple preparation method of hollow hydroxide derived from MOFs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (a) 0.4366g Co(NO 3 ) 2 6H 2 O was dissolved in 3mL of methanol solution, 5.5828g of 2-methylimidazole was dissolved in 20mL of methanol solution, and then the two solutions were mixed, stirred at room temperature for 6h, then centrifuged, washed with ethanol, and dried to obtain diamond-shaped twelve Hedra ZIF-67;

[0027] (b) Disperse ZIF-67 in 0.1mol / L NaOH ethanol solution and let stand at room temperature for 6h, then centrifuge, wash with water / ethanol three times, and dry to obtain ZIF-67@Co(OH) 2 ;

[0028] (c) ZIF-67@Co(OH) 2 Disperse in a mixed solution of ethanol and water, stir and reflux in an oil bath at 90°C for 1 hour to remove excess ZIF-67, then centrifuge, wash with alcohol, and dry to obtain a porous / hollow structure of Co(OH) 2 Material.

Embodiment 2

[0030] (a) 0.4366g Co(NO 3 ) 2 6H 2 O was dissolved in 3mL of methanol solution, 5.5828g of 2-methylimidazole was dissolved in 20mL of methanol solution, and then the two solutions were mixed, stirred at room temperature for 6h, then centrifuged, washed with ethanol, and dried to obtain diamond-shaped twelve Hedra ZIF-67;

[0031] (b) 100mg Ni(NO 3 ) 2 6H 2 O was dissolved in 100 mL ethanol, then 100 mg ZIF-67 polyhedron was added to the above solution, and the suspension was slowly stirred at room temperature for 12 h, and Ni 2+ After the exchange, centrifuge, wash with alcohol several times, and dry at 50°C to obtain Co / Ni-MOF;

[0032] (c) Disperse Co / Ni-MOF in 0.1mol / L NaOH ethanol solution and let it stand at room temperature for 6h, then centrifuge, wash with water / ethanol three times, and dry to obtain MOFs@Co(OH) 2 / Ni(OH) 2 ;

[0033] (d) MOFs@Co(OH) 2 / Ni(OH) 2 Disperse in a mixed solution of ethanol and water, stir and reflux in an oil bath at 90°C for ...

Embodiment 3

[0035] (a) 0.4366g Co(NO 3 ) 2 6H 2 O was dissolved in 3mL of methanol solution, 5.5828g of 2-methylimidazole was dissolved in 20mL of methanol solution, and then the two solutions were mixed, stirred at room temperature for 6h, then centrifuged, washed with ethanol, and dried to obtain diamond-shaped twelve Hedra ZIF-67;

[0036] (b) 100mg Ce(NO 3 ) 3 6H 2O was dissolved in 100 mL of ethanol, and then 100 mg of ZIF-67 polyhedron was added to the above solution. The suspension was stirred slowly at room temperature for 12 h, and with Ce 3+ After exchange, centrifuge, wash with alcohol several times, and dry at 50°C to obtain Co / Ce-MOF;

[0037] (c) Disperse Co / Ce-MOF in 0.1mol / L NaOH ethanol solution and let it stand at room temperature for 6h, then centrifuge, wash with water / ethanol three times, and dry to obtain MOFs@Co(OH) 2 / Ce(OH) 3 ;

[0038] (d) MOFs@Co(OH) 2 / Ce(OH) 3 Disperse in a mixed solution of ethanol and water, stir and reflux in an oil bath at 90...

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Abstract

The invention provides a simple preparation method of hollow hydroxide derived from MOFs. The simple preparation method comprises the steps: firstly, carrying out an interfacial reaction on rhombic dodecagonal ZIF-67 or bi-metal MOF and an ethanol solution of NaOH to form a hydroxide shell on the surface of MOF; and then, selectively removing an unreacted MOF template to obtain a porous / hollow structural metal hydroxide with a uniform shape. The invention relates to the preparation method for obtaining the porous / hollow metal hydroxide by sequentially carrying out an interfacial reaction and selective dissolution.

Description

technical field [0001] The invention belongs to the technical field of functional materials. Specifically, the invention relates to a method for preparing single / double metal hydroxides with hollow structures by using MOFs as templates through interfacial reactions and selective dissolution strategies. Background technique [0002] Due to their unique physical properties, such as large specific surface area, low density, low thermal expansion coefficient and refractive index, and good surface permeability, micron- and nano-sized hollow structure materials are widely used in catalysis, lithium-ion batteries, and drug encapsulation and Transmission and other fields have great application prospects. So far, researchers have prepared different micro-nano hollow structure materials through different strategies. Among them, the template method, as a simple and practical strategy, has been widely used to prepare different types of hollow structural materials. [0003] Metal-organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04C01G53/04
CPCC01G51/04C01G53/04C01P2002/72C01P2004/04
Inventor 宋良浩许田田王勇陈国柱
Owner UNIV OF JINAN
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