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A method for the controllable preparation of manganese oxides with different structures using manganese terephthalate dihydrate as a precursor

A technology of terephthalic acid and manganese phthalate, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of single product type, destruction of complex skeleton, single reaction conditions, etc., to achieve the effect of regulating performance and improving species

Inactive Publication Date: 2021-04-20
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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  • A method for the controllable preparation of manganese oxides with different structures using manganese terephthalate dihydrate as a precursor
  • A method for the controllable preparation of manganese oxides with different structures using manganese terephthalate dihydrate as a precursor
  • A method for the controllable preparation of manganese oxides with different structures using manganese terephthalate dihydrate as a 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 to normal temperature naturally, 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 oxides with different structures by using manganese terephthalate dihydrate as a precursor. The method uses manganese terephthalate dihydrate as a precursor and potassium permanganate as an oxidant. Different structural types of manganese oxides can be obtained by adjusting the pH, temperature and molar ratio of potassium permanganate and precursor by thermal method. The preparation method of the invention is simple, the reaction conditions are mild, and the pore structure with abundant and stable complexes can be used to realize the oxidation of manganese oxides of various structures (for example: manganite α-MnO 2 , pyrolusite β-MnO 2 , Hexagonite γ-MnO 2 , birnessite δ-MnO 2 , Heganite) controllable preparation, is a very 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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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02
CPCC01G45/02C01P2002/72C01P2004/03
Inventor 李淑妮袁彦凯
Owner SHAANXI NORMAL UNIV
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