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Cryptomelane type manganese dioxide oxidant with three-dimensional structure as well as preparation method and application thereof

A technology of cryptopotassium manganese ore and manganese dioxide, which is applied in the field of nanomaterials, can solve the problems of poor repeatability, difficulty in large-scale production, and low yield, and achieve the effects of high yield, good repeatability, and safe and simple operation methods

Pending Publication Date: 2021-07-16
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although, in recent years, there have been three-dimensional cryptopotassium manganese-type manganese dioxide preparation methods, but the use of highly toxic and carcinogenic chemical reagents, high-pressure hydrothermal reaction conditions lead to low yield and poor repeatability, making it difficult to produce on a large scale

Method used

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  • Cryptomelane type manganese dioxide oxidant with three-dimensional structure as well as preparation method and application thereof
  • Cryptomelane type manganese dioxide oxidant with three-dimensional structure as well as preparation method and application thereof
  • Cryptomelane type manganese dioxide oxidant with three-dimensional structure as well as preparation method and application thereof

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preparation example Construction

[0036] One aspect of the embodiments of the present invention provides a method for preparing a three-dimensional structure of cryptopotassium manganese dioxide oxidant, which includes:

[0037] Reacting a uniformly mixed reaction system containing potassium permanganate, divalent manganese salt, cerium salt, bismuth salt and acid at 50-100°C for 5-24 hours to prepare a three-dimensional structure of cryptopotassium manganese ore-type manganese dioxide oxidant;

[0038] Wherein, the molar ratio of the potassium permanganate, cerium salt and bismuth salt is 1:(0.015-0.075):(0.012-0.55).

[0039] In some more specific embodiments, the molar ratio of potassium permanganate to divalent manganese salt is 1:1-2.

[0040] Further, the molar ratio of potassium permanganate to acid is 1:0.001-4.

[0041] In some more specific embodiments, the divalent manganese salt includes any one or a combination of two or more of manganese sulfate, manganese chloride, manganese nitrate, and mangan...

Embodiment 1

[0070] (1) At room temperature, dissolve 0.104mol of manganese sulfate, 0.0056mol of cerium nitrate, 0.0036mol of bismuth nitrate and 6mL of nitric acid in 60mL of deionized water, and add 200mL of deionized aqueous solution containing 0.074mol of potassium permanganate dropwise into the above mixed solvent , after stirring and mixing evenly, stirring and reacting at 60°C for 24h, filtering, washing with distilled water, and drying at 100°C for 12h, to obtain a three-dimensional structure of cryptopotassium manganese dioxide manganese dioxide oxidant material. Identification of material morphology: the SEM spectrum of the three-dimensional structure of the cryptopotassium manganese dioxide oxidant obtained in this embodiment is as follows figure 1 As shown, its specific surface area is 205m 2 / g.

[0071] (2) Application of oxidative degradation of water organic pollutants

[0072] In the active red 2 dye waste water of 200mg / L, add the three-dimensional structure potassium ...

Embodiment 2

[0075] (1) At room temperature, dissolve 0.4mol of manganese sulfate, 0.022mol of cerium nitrate, 0.014mol of bismuth nitrate and 24mL of nitric acid in 200mL of deionized water, and drop 1L of deionized aqueous solution containing 0.4mol of potassium permanganate into the above mixed solvent , after stirring and mixing evenly, stirring and reacting at 100°C for 20h, filtering, washing with distilled water, and drying at 120°C for 2h, to obtain a three-dimensional structure of cryptopotassium manganese dioxide manganese dioxide oxidant material. Material morphology identification: the present embodiment obtains the SEM spectrogram of the cryptopotassium manganese ore type manganese dioxide oxidant material with three-dimensional structure as figure 2 As shown, its specific surface area is 203m 2 / g.

[0076] (2) Application of oxidative degradation of water organic pollutants

[0077] To 200mg / L of acid scarlet G dye waste water, add the three-dimensional structure of the c...

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Abstract

The invention discloses a cryptomelane type manganese dioxide oxidant with a three-dimensional structure as well as a preparation method and application thereof. The preparation method comprises the following steps that a uniformly mixed reaction system containing potassium permanganate, divalent manganese salt, cerium salt, bismuth salt and acid is subjected to a reaction at 50-100 DEG C for 5-24 h, the cryptomelane type manganese dioxide oxidant with a three-dimensional structure is prepared, and the molar ratio of potassium permanganate to cerium salt to bismuth salt is 1: (0.015-0.075): (0.012-0.55). The preparation method disclosed by the invention is simple, high in yield and good in repeatability, the used raw materials are low in toxicity, and large-scale production is facilitated. The cryptomelane type manganese dioxide oxidant prepared by the method has a unique center aggregation type cuboid structure and a single cryptomelane crystal phase, can greatly improve the specific surface area and the surface adsorption energy, and can be used as a solid oxidant to directly oxidize and degrade organic pollutants in a water body under a neutral condition.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to a three-dimensional structure of cryptopotassium manganese ore-type manganese dioxide oxidizer and its preparation method and application, especially to a three-dimensional structure of cryptopotassium manganese ore-type manganese dioxide oxidizer and its preparation method. And its application in oxidative degradation of organic pollutants in water under neutral conditions. Background technique [0002] Cryptopotassium manganese dioxide, also known as manganese oxide octahedral molecular sieve, is a typical one-dimensional nanofiber linear structure material, which consists of 2x2 manganese oxygen hexahedral structural units arranged in a shared edge to form a potassium ion-containing Pore ​​structure, the pore size is Cryptopotassium manganese dioxide exhibits excellent properties in adsorption, catalysis, oxidation, and conductivity due to its mixed valence state of Mn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/10B01J37/03C02F1/72C02F101/30C02F101/38C02F101/34
CPCB01J23/34B01J23/002B01J37/031C02F1/725C02F2101/308C02F2101/38C02F2101/34B01J2523/00B01J35/615B01J2523/3712B01J2523/54B01J2523/72
Inventor 孟旭赵培庆张丽萍毕秀茹苟明霞
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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