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Preparation method and application of mixed valence manganese oxide/silver phosphate photocatalyst

A technology of manganese oxide and mixed valence states, applied in the field of photocatalysis, to achieve high-efficiency visible light catalytic degradation of pollutants in water, increase degradation rate, and improve low quantum efficiency

Active Publication Date: 2021-01-01
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently based on Mn 3 o 4 -MnO 2 with Cubic Ag 3 PO 4 The construction of composite photocatalyst materials and their application in the photocatalytic degradation of environmental pollutants has not been reported yet

Method used

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  • Preparation method and application of mixed valence manganese oxide/silver phosphate photocatalyst
  • Preparation method and application of mixed valence manganese oxide/silver phosphate photocatalyst
  • Preparation method and application of mixed valence manganese oxide/silver phosphate photocatalyst

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preparation example Construction

[0026] The invention provides a method for preparing a mixed valence manganese oxide / silver phosphate photocatalyst, the preparation method comprising:

[0027] (1) MnCl 2 4H 2 O. Mix PVP (polyvinylpyrrolidone) and the first water, then add NaOH solution, and add KMnO after 2-3min 4 solution, after stirring, filtering, washing and drying, Mn 3 o 4 -MnO 2 Nanosheets;

[0028] (2) PEG 2000 (polyethylene glycol 2000), Na 2 HPO 4 12H 2 O, Mn 3 o 4 -MnO 2 Mix the nanosheets with the second water, heat to 55-65°C after ultrasonication, then add silver ammonia solution, stir, filter, wash and dry to obtain mixed valence manganese oxide / silver phosphate photocatalyst (Mn 3 o 4 -MnO 2 / Cubic Ag 3 PO 4 composite photocatalyst).

[0029] In a preferred embodiment of the present invention, in order to further increase the photocatalytic efficiency of the composite photocatalyst that makes, with respect to the first water of 20mL, MnCl 2 4H 2 The amount of O is 0.8-1g, th...

Embodiment 1

[0043] 0.9gMnCl 2 4H 2 O, 1gPVP and 20mL of the first water (the temperature of the first water is 60°C) were mixed, then 4.5mL of 2mol / L NaOH solution was added, and 5mL of 0.2mol / L KMnO was added after 2min 4 solution, after stirring for 3 h, filtering, washing and drying at 60°, Mn 3 o 4 -MnO 2 nanosheets; 0.4g AgNO 3 Dissolve in 100 mL deionized water, drop into 26 wt % of dilute ammonia water until the precipitate just disappears to obtain a silver ammonia solution. Mix 5gPEG 2000, 7.16gNa 2 HPO 4 12H 2 O, 0.0062gMn 3 o 4 -MnO 2 Mix nanosheets with 90mL of second water, heat to 60°C after ultrasonication, then add silver ammonia solution, stir for 60min, filter, wash and dry at 60° to obtain Mn 3 o 4 -MnO 2 / Cubic Ag 3 PO 4 Composite photocatalyst A1; in Mn 3 o 4 -MnO 2 / CubicAg 3 PO 4 Composite photocatalyst A1, Mn 3 o 4 -MnO 2 has a quality score of 3 wt %, Cubic Ag 3 PO 4 has a quality score of 97 wt %, the sample is marked as 3 wt % ...

Embodiment 2

[0045] 0.9gMnCl 2 4H 2 O, 1gPVP and 20mL of the first water (the temperature of the first water is 60°C) were mixed, then 4.5mL of 2mol / L NaOH solution was added, and 5mL of 0.2mol / L KMnO was added after 2min 4 solution, after stirring for 3 h, filtering, washing and drying at 60°, Mn 3 o 4 -MnO 2 nanosheets; 0.4g AgNO 3 Dissolve in 100 mL deionized water, drop into 26 wt % of dilute ammonia water until the precipitate just disappears to obtain a silver ammonia solution. Mix 5gPEG 2000, 7.16gNa 2 HPO 4 12H 2 O, 0.0020gMn 3 o 4 -MnO 2 Mix nanosheets with 90mL of second water, heat to 60°C after ultrasonication, then add silver ammonia solution, stir for 60min, filter, wash and dry at 60° to obtain Mn 3 o 4 -MnO 2 / Cubic Ag 3 PO 4 Composite photocatalyst A2; in Mn 3 o 4 -MnO 2 / CubicAg 3 PO 4 Composite photocatalyst A2, Mn 3 o 4 -MnO 2 has a quality score of 1 wt %, Cubic Ag 3 PO 4 has a quality score of 99 wt %, the sample is marked as 1 wt % Mn...

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Abstract

The invention discloses a mixed valence manganese oxide / silver phosphate photocatalyst and its preparation method and application. The preparation method includes: adding MnCl 2 ·4H 2 Mix O, PVP and the first water, then add NaOH solution, and add KMnO after 2-3 minutes 4 Solution, after stirring, filtering, washing and drying, Mn is obtained 3 O 4 ‑MnO 2 Nanosheets; combine PEG 2000, Na 2 HPO 4 ·12H 2 O.Mn 3 O 4 ‑MnO 2 The nanosheets are mixed with the second water, heated to 55-65°C after sonication, and then a silver ammonia solution is added. After stirring, filtering, washing and drying, a mixed valence manganese oxide / silver phosphate photocatalyst is obtained. Improved Mn 3 O 4 ‑MnO 2 Low quantum efficiency and other shortcomings are solved by Ag 3 PO 4 Defects include serious carrier recombination, photoreduction, and slight water solubility.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a mixed valence state manganese oxide / silver phosphate photocatalyst and its preparation method and application. Background technique [0002] With the emergence of the energy crisis and the deterioration of the global environment, energy and the environment are major issues that human beings face in the 21st century and need to be resolved urgently. Solar energy is a kind of renewable energy, which has the advantages of inexhaustible, clean and pollution-free. As a "green" technology, photocatalytic technology can use sunlight as a light source. It can not only be used to deal with water pollution, but also can be used to deal with air pollution, soil pollution, sterilization and other aspects, showing extremely Broad application value (Chem. Rev., 2014, 114, 9919−9986). [0003] In recent years, silver phosphate (Ag 3 PO 4 ) as a promising photocatalytic material, which has hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/187C02F1/30C02F101/20
CPCC02F1/30B01J27/187C02F2101/308B01J35/39
Inventor 包木太孙琳蔡昊原杨晓龙陆金仁李一鸣
Owner OCEAN UNIV OF CHINA
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