Silicate modified manganese-based material and preparation method and application thereof

Patent metadata

Field	Value
Publication number	US-2024351005-A1
Application number	US-202318503234-A
Country	US
Kind code	A1
Filing date	Nov 7, 2023
Priority date	Apr 23, 2023
Publication date	Oct 24, 2024
Grant date	—

Abstract

Provided are a silicate modified manganese-based material and a preparation method and application thereof. The silicate modified manganese-based material has a nanoscale needle like structure, and is prepared from a solution containing a manganese source and a soluble silicate source through an oxidation-reduction reaction and then a hydrothermal reaction. The manganese source includes a divalent manganese source and a heptavalent manganese source, with Mn (II) and Mn (VII) in a molar ratio of 0.5-5.5 to 1. The present disclosure uses silicate to regulate manganese oxides, significantly reducing the particle size of the manganese-based material, generating manganese vacancies, and changing the surface manganese valence state. An advanced oxidation system formed by the silicate modified manganese-based material and an oxidant has high removal rate and reaction rate for various organic compounds.

First claim

What is claimed is:

1 . A silicate modified manganese-based material, having a nanoscale needle like structure, and being prepared from a solution containing a manganese source and a soluble silicate source through an oxidation-reduction reaction and then a hydrothermal reaction, the manganese source comprising a divalent manganese source and a heptavalent manganese source, with Mn (II) and Mn (VII) in a molar ratio of 0.5-5.5 to 1.

2 . The silicate modified manganese-based material according to claim 1 , wherein the molar ratio of Si to Mn (VII) in the solution is 0.1-2.8 to 1.

3 . A preparation method of the silicate modified manganese-based material according to claim 1 , comprising the following steps:
conducting an oxidation-reduction reaction on a solution containing a manganese source and a soluble silicate source to obtain a mixed solution; and conducting a hydrothermal reaction on the mixed solution to obtain a silicate modified manganese-based material, the manganese source comprising a divalent manganese source and a heptavalent manganese source, with Mn (II) and Mn (VII) in a molar ratio of 0.5-5.5 to 1.

4 . The preparation method according to claim 3 , wherein
the divalent manganese source is selected from at least one of manganese chloride, manganese nitrate, and manganese sulfate; the heptavalent manganese source is selected from at least one of potassium permanganate, sodium permanganate and ammonium permanganate; and the soluble silicate source is selected from at least one of sodium silicate, potassium metasilicate, layered crystalline sodium disilicate, layered crystalline potassium disilicate, and multiple layered crystalline composite silicates.

5 . The preparation method according to claim 3 , wherein the oxidation-reduction reaction is conducted under the following specific conditions of:
stirring at room temperature; and a reaction time of 0.5-1.5 h.

6 . The preparation method according to claim 3 , wherein the hydrothermal reaction is conducted under the following specific conditions of:
a reaction temperature of 140-160° C.; and a reaction time of 4-12 h.

7 . A method for removing organic pollutants from a contaminated water body, the method comprising adding the silicate modified manganese-based material according to claim 1 and an oxidant for removing organic pollutants into the contaminated water body;
wherein the oxidant is peroxymonosulfate and/or persulfate.

8 . The method according to claim 7 , wherein
the dosage of the silicate modified manganese-based material is 0.2-2 g/L; and the dosage of the oxidant is 1-20 mmol/L.

9 . The method according to claim 8 , wherein the silicate modified manganese-based material and the oxidant are reacted in the water body under the following specific conditions:
a pH value of 3-9; room temperature; and a reaction time of 50-80 min.

Assignees

• Chinese Res Acad Env Sciences

Inventors

• Zheng Mingxia
• Zhang Xu
• Feng Liu
• Yu Minda
• Su Jing
• Xi Beidou

Classifications

• C02F2101/38

  containing nitrogen · CPC title

• B01J37/04

  Mixing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J37/031

  Precipitation · CPC title

• C02F1/722

  Oxidation by peroxides · CPC title

• C01G45/1214

  containing alkali metals · CPC title