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Method for controllably preparing manganese oxide with different structures by taking manganese terephthalate dihydrate as precursor

A technology of manganese phthalate and terephthalic acid, which is applied in the field of preparing manganese oxides with different structures by hydrothermal method, can solve the problems of single type of product, destruction of complex skeleton, single reaction conditions, etc. Effect

Inactive Publication Date: 2019-04-09
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The calcination reaction requires a higher temperature, which may destroy the original skeleton of the complex, and the reaction conditions are single, and the product types are single

Method used

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  • Method for controllably preparing manganese oxide with different structures by taking manganese terephthalate dihydrate as precursor
  • Method for controllably preparing manganese oxide with different structures by taking manganese terephthalate dihydrate as precursor
  • Method for controllably preparing manganese oxide with different structures by taking manganese terephthalate dihydrate as precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 0.025g (0.157mmol) of potassium permanganate and 0.080g (0.314mmol) of manganese terephthalate dihydrate into a glass bottle with a Teflon lid, and then add 10mL of H 2 SO 4 Aqueous solution, stirred and mixed evenly, left to react for 3.5 days at 85°C under airtight conditions, cooled naturally to room temperature, poured out the supernatant, washed the solid product at the bottom with 0.1mol / L NaOH aqueous solution, centrifuged, and cooled at 60°C Dry to constant weight to get 2×2 tunnel-type manganite α-MnO 2 . Depend on figure 1 It can be seen that the powder X-ray diffraction curve of the product obtained is consistent with the standard PDF card, indicating that the product is manganese ore.

Embodiment 2

[0026] Add 0.025g (0.157mmol) of potassium permanganate, 0.080g (0.314mmol) of manganese terephthalate dihydrate, and 10mL of deionized water into a glass bottle with a polytetrafluoroethylene cover, stir and mix evenly. Stand at 85°C for 3.5 days, cool naturally to room temperature, pour out the supernatant, wash the solid product at the bottom with 0.1mol / L NaOH aqueous solution, centrifuge, and dry to constant weight at 60°C to obtain 2×2 Tunnel type manganese potash ore α-MnO 2 (See figure 1 ).

Embodiment 3

[0028] Add 0.050g (0.314mmol) of potassium permanganate and 0.080g (0.314mmol) of manganese terephthalate dihydrate into a glass bottle with a Teflon cover, then add 10mL of NaOH aqueous solution with pH=9, stir and mix well , standing at 85°C for 3.5 days under airtight conditions, naturally cooling to room temperature, pouring out the supernatant, washing the solid product at the bottom with 0.1mol / L NaOH aqueous solution, centrifuging, and drying at 60°C to constant weight, Get 2×2 tunnel type manganese α-MnO 2 (See figure 1 ).

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Abstract

The invention discloses a method for controllably preparing manganese oxide with different structures by taking a manganese terephthalate dihydrate as a precursor. According to the method, manganese oxide with different structure types is obtained by taking the manganese terephthalate dehydrate as the precursor, selecting potassium permanganate as an oxidant, adopting a hot method and regulating the pH value, the temperature and the molar ratio of potassium permanganate to the precursor. The preparation method disclosed by the invention is simple, mild in reaction condition and capable of realizing the controllable preparation of manganese oxide with various structures (such as cryptomelane alpha-MnO2, pyrolusite beta-MnO2, nsutite gramma-MnO2, birnessite delta-MnO2 and black manganese ores) by utilizing an abundant and stable pore structure of a complex so as to be a promising preparation method.

Description

technical field [0001] The invention belongs to the technical field of manganese oxide preparation, and in particular relates to a method for preparing manganese oxides with different structures by using manganese terephthalate dihydrate as a precursor through a hydrothermal method. Background technique [0002] Manganese oxide belongs to amphoteric transition metal oxides, and exists as a very stable black or brown powdery solid at room temperature. The basic structural unit that constitutes manganese oxide crystals is MnO 6 Octahedron, which is formed by the coordination of 6 oxygen atoms at the vertices and 1 manganese atom at the center of the octahedron. adjacent MnO 6 Manganese oxide crystals of various structures are formed by connecting octahedrons in a way of sharing edges or sharing corners. Although the basic structural units constituting manganese oxide crystals are the same, because MnO 6 The octahedron connection mode is different, and the manganese oxide c...

Claims

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Application Information

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IPC IPC(8): C01G45/02
CPCC01G45/02C01P2002/72C01P2004/03
Inventor 李淑妮袁彦凯
Owner SHAANXI NORMAL UNIV
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