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A preparation method and application of an iron-manganese composite oxide material using cations to control the morphology
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A composite oxide, cation technology, applied in chemical instruments and methods, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as water pollution
Active Publication Date: 2021-11-09
INNER MONGOLIA UNIV OF SCI & TECH
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[0005] The technical problem to be solved by the present invention is to overcome the problems existing in the prior art, and to provide a preparation method and application of an iron-manganese composite oxide material that uses cations to control the morphology. Problems of water pollution caused by working at low pH
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Embodiment 1
[0029] Embodiment 1: the preparation of spherical iron-manganese composite oxide material, 1.35g FeCl 3 ·6H 2 O, 0.693gMnCl 2 4H 2 O and 1g of lithium acetate (sodium acetate or potassium acetate) were dissolved in 50mL of ethylene glycol, stirred magnetically at room temperature for half an hour to dissolve, then transferred to a 100mL hydrothermal reaction kettle with a Teflon liner, and placed in an oven for 180 Heating at ℃ for 12h, after the heating is completed, cool naturally to room temperature, filter and wash with deionized water and absolute ethanol, then dry the obtained solid at 80°C for 6h, and roast at 400°C in a muffle furnace for 2h to obtain a spherical ferromanganese composite oxide material.
Embodiment 2
[0030] Embodiment 2: the preparation of two-dimensional leaf-shaped iron-manganese composite oxide material, 1.35g FeCl 3 ·6H 2 O, 0.693gMnCl 2 4H 2 O and 1g of ammonium acetate, dissolved in 50mL of ethylene glycol, stirred magnetically at room temperature for half an hour to dissolve, then transferred to a 100mL hydrothermal reaction kettle with a Teflon liner, put in an oven and heated at 180°C for 12h, and then heated After completion, naturally cool to room temperature, filter and wash with deionized water and absolute ethanol, then dry the obtained solid at 80°C for 6h, and bake it in a muffle furnace at 400°C for 2h to obtain a two-dimensional leaf-shaped iron-manganese composite oxide material .
[0031] figure 1 In order to compare the SEM electron microscope pictures of iron-manganese composite oxides obtained by adding different acetates, it can be seen from the figure that the spherical particles obtained by adding lithium acetate, sodium acetate and potassium ...
Embodiment 3
[0033] Example 3: The heterogeneous Fenton-photocatalytic reaction performance of iron-manganese composite oxides
[0034] The reaction system contains 20 mg of iron-manganese composite oxide catalysts prepared by adding different acetates, 100 mL of methylene blue solution with a concentration of 20 mg / L and H 2 o 2 0.5mL, absorb in a dark room for 30min and then start to react with visible light irradiation. During the first 30 min of darkroom adsorption, the adsorption of methylene blue by each catalyst was weak. After the light reaction started, the catalysts degraded methylene blue quickly, and almost all catalysts could completely degrade methylene blue after 40 min.
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Abstract
The invention discloses a preparation method and application of an iron-manganese composite oxide material whose morphology is controlled by cations. The preparation method of the material comprises the following steps: respectively weighing iron salt and manganese salt in proportion and dissolving them in ethylene glycol to form a solution; adding acetate (lithium acetate, sodium acetate, potassium acetate or ammonium acetate) to the solution, After dissolving, move it into a hydrothermal kettle for hydrothermal reaction. The temperature is controlled between 150-200°C for 6-24 hours; after cooling, it is filtered, washed and dried, and roasted at 300-600°C for 2-6 hours to obtain a spherical or two-dimensional leaf shape Iron-manganese composite oxide materials with different morphologies. The iron-manganese composite oxide material of the present invention can be used for heterogeneous Fenton-photocatalytic reaction to degrade dyes such as methylene blue, and can realize efficient and rapid degradation of dyes under neutral conditions. The degradation rate of methylene blue can reach nearly 100% within 30 minutes, and the material has The magnetism can be separated from the reaction solution conveniently and quickly, so as to achieve recycling.
Description
technical field [0001] The invention relates to the technical field of self-assembly and synthesis of materials and its application to wastewater treatment, in particular to a method for preparing an iron-manganese composite oxide material using cations to regulate morphology and its application to advanced oxidation technology for treating dye wastewater. Background technique [0002] Fe 3 o 4 (magnetite, magnetite), face-centered cubic close-packed, anti-spinel structure, due to its stability, low toxicity, biocompatibility and other characteristics, it is widely used in the fields of biomedicine, technology and catalysis, limiting its application The main reason is Fe 3 o 4 The material has superparamagnetism and high surface energy, which makes it easy for the particles to aggregate with each other. mn 3 o 4 (hematite), which shows special physicochemical properties in catalysis, electrochemistry, sensing, adsorption and magnetism. Combining these two widely used ...
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