CN115518649B - (CoCuZnMnMg) 3 O 4 Preparation method of high-entropy oxide - Google Patents

(CoCuZnMnMg) 3 O 4 Preparation method of high-entropy oxide Download PDF

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CN115518649B
CN115518649B CN202211122694.7A CN202211122694A CN115518649B CN 115518649 B CN115518649 B CN 115518649B CN 202211122694 A CN202211122694 A CN 202211122694A CN 115518649 B CN115518649 B CN 115518649B
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cocuznmnmg
salt
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entropy oxide
rhodamine
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CN115518649A (en
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叶立群
李超
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China Three Gorges University CTGU
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G51/00—Compounds of cobalt
    • C01G51/006—Compounds containing, besides cobalt, two or more other elements, with the exception of oxygen or hydrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/002—Mixed oxides other than spinels, e.g. perovskite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/889—Manganese, technetium or rhenium
    • B01J23/8892—Manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/08—Heat treatment
    • B01J37/10—Heat treatment in the presence of water, e.g. steam
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G51/00—Compounds of cobalt
    • C01G51/40—Cobaltates
    • C01G51/42—Cobaltates containing alkali metals, e.g. LiCoO2
    • C01G51/44—Cobaltates containing alkali metals, e.g. LiCoO2 containing manganese
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/308—Dyes; Colorants; Fluorescent agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical

Abstract

The invention provides a (CoCuZnMnMg) 3 O 4 A method for preparing high entropy oxide. Dissolving soluble cobalt salt, copper salt, zinc salt, manganese salt and magnesium salt in deionized water at room temperature; sodium hydroxide and sodium carbonate are dissolved in deionized water; slowly pouring the alkaline solution into the mixed salt solution under the condition of intense stirring to obtain suspension; then the suspension to be obtained is subjected to high-temperature hydrothermal reaction, and then is centrifuged and dried to finally obtain (CoCuZnMnMg) 3 O 4 High entropy oxide. The method has the characteristics of simple process, high production efficiency, low production cost, high safety and reliability and the like, and is suitable for industrial production of the high-entropy oxide. Moreover, the high-entropy oxide can realize high-efficiency activation of the polysulfide under the low-temperature condition so as to effectively treat organic pollutants in water.

Description

(CoCuZnMnMg) 3 O 4 Preparation method of high-entropy oxide
Technical Field
The invention relates to the technical environment field of novel high-entropy materials, in particular to a (CoCuZnMnMg) 3 O 4 A method for preparing high entropy oxide.
Background
In recent years, advanced oxidation processes have been considered as an effective method for degrading organic pollutants through oxidation/reduction reactions induced by the same. Among them, peroxomonosulfate (PMS) in advanced oxidation is a promising water treatment technology, and PMS is easily promoted to activate an asymmetric structure under normal temperature, dark or visible light irradiation. Sulfate radicals and hydroxyl radicals, which produce a large amount of high redox potential, have been used for degradation of organic pollutants in water and wastewater, decontamination of pool water, disinfection, decomposition of activated sludge, and the like. In various activation methods for PMS, such as heat, alkali, ultraviolet light and ultrasonic waves, however, a large amount of additional energy is required for these reaction processes.
High entropy materials are of great interest to researchers due to their unique structural and functionally controllable properties. The high-entropy material is an entropy stable crystal structure with more than five metal elements, and the elements are almost equimolar proportion and uniformly distributed, so that the maximum configuration entropy of the system is ensured. In highly disordered multicomponent systems, high entropy gives rise to attractive properties such as high entropy effects, severe lattice distortion, slow diffusion and cocktail effects, etc., which have attracted extensive attention in the catalytic field with great commercial development potential. Among these high entropy materials, high Entropy Oxide (HEO) has been focused on its environmentally friendly synthetic methods and abundant catalytic applications due to the need for metal oxides and easily changeable properties (e.g., redox ability, stable chemical state).
However, the traditional HEO synthesis route is usually based on high temperature methods (T ⩾ ℃ C.). However, these methods have limited control over shape and size and tend to form micron-sized materials with low surface areas. The catalytic activity of HEOs is still far from satisfactory because of their limited active sites exposed and poor intrinsic activity. On the other hand, rational design and synthesis of nanostructured HEO catalytic capabilities, especially with high efficiency HEO nanocatalysts at low temperatures, remains challenging.
Disclosure of Invention
The invention aims to solve the problem that high temperature and instantaneous high energy density are needed in the process of preparing high-entropy oxide by a high-temperature synthesis method. The traditional production process is complex, the environmental pollution is large, and the high-temperature synthesis method can also cause cavities, looseness, uneven components and tissues on some materials and the like. Furthermore, most organic solvents are flammable and toxic, and safety measures are of great importance in the synthesis process. Therefore, the conventional preparation process is difficult to realize the industrial application of the high-entropy material.
In order to achieve the above object, the present invention provides a (CoCuZnMnMg) 3 O 4 The preparation method of the high entropy oxide is to prepare the high entropy oxide by hydrothermal synthesis with deionized water as a solvent. The method comprises the following steps:
the first step: dissolving 5-10 g/L of soluble cobalt acetate tetrahydrate, 4-8 g/L of copper acetate monohydrate, 4.4-8.8 g/L of zinc acetate dihydrate, 4.8-9.6 g/L of manganese acetate tetrahydrate and 4.3-8.6 g/L of magnesium acetate tetrahydrate in 40mL of deionized water, and stirring until the solution A is obtained. The significance of this step is that stirring until dissolution ensures that various metal ions are homogeneously dispersed in the same phase (liquid phase) in advance.
And a second step of: under the condition of stirring at room temperature, 6-10 g/L of sodium hydroxide and 6-10 g/L of sodium carbonate are dissolved in an aqueous solution to obtain a solution B; and slowly pouring the solution B into the solution A, stirring strongly, and aging for 0.5-2 h to obtain the suspension mixed solution C. The significance of this step is that the base provides a rapid reaction of hydroxyl groups with metal ions to form amorphous hydroxide precipitates, which can "lock" various metal ions in the amorphous solid phase in advance, facilitating subsequent reactions to form a single phase rather than a mixed phase of multiple metal oxides.
And a third step of: transferring the C suspension mixed solution into a hydrothermal reaction kettle, performing a hydrothermal reaction at a reaction temperature of 80-160 ℃ for 12-48 hours, centrifuging, washing with deionized water, and drying to obtain (CoCuZnMnMg) 3 O 4 High entropy oxide. The significance of this step is that the hydrothermal reaction promotes the conversion of the amorphous hydroxide described above to a crystalline high entropy oxide.
A further embodiment of the invention is the preparation of the (CoCuZnMnMg) 3 O 4 The use of a high entropy oxide activated persulfate to remove contaminants.
The pollutant is a pollutant containing rhodamine B, and the concentration of the rhodamine B is 5-20 mg/L; the persulfate comprises persulfate PMS, and the addition amount of the persulfate PMS is 5-20mg/ml.
(CoCuZnMnMg) 3 O 4 The addition amount of the high-entropy oxide is 0.01-5g/L; said (CoCuZnMnMg) 3 O 4 In the process of removing sewage, the temperature of the sewage is controlled to be 1-10 ℃.
The invention has the advantages that:
the high-entropy material prepared by the method has uniform composition and considerable yield. The composition of the different high-entropy materials can also be controlled by adjusting the composition of the different metal salts.
The method prepares the high-entropy catalyst by low-temperature hydrothermal synthesis, has low temperature and low energy consumption in the preparation process, greatly reduces the production cost, does not generate toxic and harmful substances, and has the characteristics of low cost and easy operation.
Thirdly, the invention has the advantages of simple production process, good consistency of the formed product, small environmental pollution and the like, and has great significance for the environmental treatment field and the mass production of high-entropy catalysts.
Fourthly, the high-entropy material prepared by the method can be used for degrading various pollutants by activating the peroxymonosulfate, and has high-efficiency activation performance at low temperature.
Drawings
FIG. 1 example 1 (CoCuZnMnMg) 3 O 4 High entropy oxide XRD pattern.
FIG. 2 example 1 (CoCuZnMnMg) 3 O 4 High entropy oxide SEM pictures.
FIG. 3 example 1 (CoCuZnMnMg) 3 O 4 High entropy oxide TEM images.
FIG. 4 example 1 (CoCuZnMnMg) 3 O 4 The degradation profile of the high entropy oxide on the organic contaminant (rhodamine B) at low temperature corresponds to the reaction rate.
FIG. 5 example 2 (CoCuZnMn) 3 O 4 High entropy oxide XRD pattern.
FIG. 6 example 2 (CoCuZnMn) 3 O 4 The degradation profile of the high entropy oxide on the organic contaminant (rhodamine B) at low temperature corresponds to the reaction rate.
FIG. 7 example 3 (CoCuZn) 3 O 4 Oxide XRD pattern.
FIG. 8 example 3 (CoCuZn) 3 O 4 Degradation patterns of oxides on organic pollutants (rhodamine B) under low temperature conditions correspond to reaction rates.
FIG. 9 example 4 (CoCu) 3 O 4 Oxide XRD pattern.
FIG. 10 example 4 (CoCu) 3 O 4 Degradation patterns of oxides on organic pollutants (rhodamine B) under low temperature conditions correspond to reaction rates.
FIG. 11 example 5 preparation of nitrate (CoCuZnMnMg) 3 O 4 High entropy oxide XRD pattern.
FIG. 12 example 5 preparation of nitrate (CoCuZnMnMg) 3 O 4 The degradation profile of the high entropy oxide on the organic contaminant (rhodamine B) at low temperature corresponds to the reaction rate.
FIG. 13 example 6 solvent is absolute ethanol (CoCuZnMnMg) 3 O 4 High entropy oxide XRD pattern.
FIG. 14 example 6 solvent is absolute ethanol (CoCuZnMnMg) 3 O 4 The degradation profile of the high entropy oxide on the organic contaminant (rhodamine B) at low temperature corresponds to the reaction rate.
FIG. 15 example 7 is Co 3 O 4 Degradation patterns of organic contaminants (rhodamine B) at low temperature correspond to reaction rates.
Detailed Description
Example 1
Soluble cobalt acetate tetrahydrate 6 g/L, copper acetate monohydrate 4 g/L, zinc acetate dihydrate 4.4 g/L, manganese acetate tetrahydrate 4.8 g/L and magnesium acetate tetrahydrate 4.4 g/L are dissolved in 40mL deionized water and stirred until dissolved to obtain solution A. Next, 6.4. 6.4 g/L sodium hydroxide and 6.8. 6.8 g/L sodium carbonate were dissolved in 40: 40mL deionized water to give solution B. Slowly pouring the solution B into the solution A, uniformly stirring, and aging for 0.5 to h to obtain the suspension mixed solution C. And finally, the suspension mixed solution is put into a hydrothermal reaction kettle for hydrothermal reaction, wherein the reaction temperature is 120 ℃, and the reaction time is 12 h. And then taking out, centrifuging, washing with pure water in sequence, and drying at 120 ℃ in vacuum. Thus obtaining (CoCuZnMnMg) 3 O 4 High entropy oxide.
Weigh 5 mg (CoCuZnMnMg) 3 O 4 The high entropy oxide is placed in 50 mL organic pollutant (rhodamine B) and stirred uniformly, and the concentration of the rhodamine B is 10 mg/L. And (3) controlling the temperature condition by adopting a condensate water low-temperature box, adding PMS of 15.3 and mg when the water temperature is stabilized to 5 ℃ or 10 ℃, timing and taking a point, and then transferring to an ultraviolet-visible spectrophotometer to test the concentration of rhodamine B.
FIGS. 1, 2 and 3 are, respectively, those prepared in example 1 (CoCuZnMnMg) 3 O 4 XRD, SEM and TEM images of the high entropy oxide. As can be seen from the figure: (CoCuZnMnMg) 3 O 4 Diffraction peaks correspond to CoO (PDF # 78-0431) and CoCo 2 O 4 (PDF # 80-1545) with a particle size of about several to tens of nanometers. FIG. 4 is a graph of the composition of example 1 (CoCuZnMnMg) 3 O 4 Degradation profile of high entropy oxide on organic contaminants (rhodamine B) under low temperature conditions. As can be seen from the figure: at 5℃and 10℃within 5 minutes (CoCuZnMnMg) 3 O 4 The removal rate of rhodamine B can reach 100 percent. The reaction rates were 0.29 min -1 And 0.38 min -1 。
Example 2
Soluble cobalt acetate tetrahydrate 6 g/L, copper acetate monohydrate 4 g/L, zinc acetate dihydrate 4.4 g/L and manganese acetate tetrahydrate 4.8 g/L are dissolved in 40mL deionized water and stirred until dissolved to obtain solution A. Next, 6.4. 6.4 g/L sodium hydroxide and 6.8. 6.8 g/L sodium carbonate were dissolved in 40: 40mL deionized water to give solution B. Slowly pouring the solution B into the solution A, uniformly stirring, and aging for 0.5 to h to obtain the suspension mixed solution C. And finally, placing the C suspension mixed solution into a hydrothermal reaction kettle for carrying out a hydrothermal reaction, wherein the reaction temperature is 120 ℃, and the reaction time is 12 h. And then taking out, centrifuging, washing with pure water in sequence, and drying at 120 ℃ in vacuum. Thus, it was obtained (CoCuZnMn) 3 O 4 High entropy oxide.
Weigh 5 mg (CoCuZnMn) 3 O 4 The high entropy oxide is placed in 50 mL organic pollutant (rhodamine B) and stirred uniformly, and the concentration of the rhodamine B is 10 mg/L. And (3) controlling the temperature condition by adopting a condensate water low-temperature box, adding PMS of 15.3 and mg when the water temperature is stabilized to 5 ℃ or 10 ℃, timing and taking a point, and then transferring to an ultraviolet-visible spectrophotometer to test the concentration of rhodamine B.
FIG. 5 is a sample of the preparation of example 2 (CoCuZnMn) 3 O 4 XRD pattern of high entropy oxide. As can be seen from the figure: (CoCuZnMn) 3 O 4 Diffraction peaks correspond to CoO (PDF # 78-0431) and CoCo 2 O 4 (PDF # 80-1545). FIG. 6 is a graph of the composition of example 2 (CoCuZnMn) 3 O 4 Degradation profile of high entropy oxide on organic contaminants (rhodamine B) under low temperature conditions. As can be seen from the figure: at 5℃and 10℃for 5 minutes (CoCuZnMn) 3 O 4 The removal rate of rhodamine B is 100%. The reaction rates were 0.19 min -1 And 0.36 min -1 。
Example 3
Soluble cobalt acetate tetrahydrate 6 g/L, copper acetate monohydrate 4 g/L and zinc acetate dihydrate 4.4 g/L are dissolved in 40mL deionized water and stirred until dissolved to obtain solution A. Next, 6.4. 6.4 g/L sodium hydroxide and 6.8. 6.8 g/L sodium carbonate were dissolved in 40: 40mL deionized water to give solution B. Slowly pouring the solution B into the solution A, uniformly stirring, and aging for 0.5 to h to obtain the suspension mixed solution C. And finally, placing the C suspension mixed solution into a hydrothermal reaction kettle for carrying out a hydrothermal reaction, wherein the reaction temperature is 120 ℃, and the reaction time is 12 h. And then taking out, centrifuging, washing with pure water in sequence, and drying at 120 ℃ in vacuum. Thus, it was obtained (CoCuZn) 3 O 4 High entropy oxide.
Weigh 5 mg (CoCuZn) 3 O 4 The oxide is placed in 50 mL organic pollutant (rhodamine B) and stirred uniformly, and the concentration of the rhodamine B is 10 mg/L. And (3) controlling the temperature condition by adopting a condensate water low-temperature box, adding PMS of 15.3 and mg when the water temperature is stabilized to 5 ℃ or 10 ℃, timing and taking a point, and then transferring to an ultraviolet-visible spectrophotometer to test the concentration of rhodamine B.
FIG. 7 is a sample of the composition prepared in example 3 (CoCuZn) 3 O 4 XRD pattern of the oxide. As can be seen from the figure: (CoCuZn) 3 O 4 Diffraction peaks correspond to CoO (PDF # 78-0431) and CoCo 2 O 4 (PDF # 80-1545). FIG. 8 is a sample of the composition prepared in example 3 (CoCuZn) 3 O 4 Degradation profile of high entropy oxide on organic contaminants (rhodamine B) under low temperature conditions. As can be seen from the figure: within 5 minutes (CoCuZn) at 5℃and 10 ℃ 3 O 4 The removal rates for rhodamine B were 12% and 21%, respectively. The reaction rates were 0.035min, respectively -1 And 0.045min -1 。
Example 4
To be soluble cobalt acetateTetrahydrate 6 g/L and copper acetate monohydrate 4 g/L are dissolved in 40mL deionized water, and stirred until dissolved to obtain solution A. Next, 6.4. 6.4 g/L sodium hydroxide and 6.8. 6.8 g/L sodium carbonate were dissolved in 40: 40mL deionized water to give solution B. Slowly pouring the solution B into the solution A, uniformly stirring, and aging for 0.5 to h to obtain the solution C. And finally, placing the C solution into a hydrothermal reaction kettle for hydrothermal reaction, wherein the reaction temperature is 120 ℃, and the reaction time is 12 h. And then taking out, centrifuging, washing with pure water in sequence, and drying at 120 ℃ in vacuum. Thus, it was obtained (CoCu) 3 O 4 High entropy oxide.
Weigh 5 mg (CoCu) 3 O 4 The oxide is placed in 50 mL organic pollutant (rhodamine B) and stirred uniformly, and the concentration of the rhodamine B is 10 mg/L. And (3) controlling the temperature condition by adopting a condensate water low-temperature box, adding PMS of 15.3 and mg when the water temperature is stabilized to 5 ℃ or 10 ℃, timing and taking a point, and then transferring to an ultraviolet-visible spectrophotometer to test the concentration of rhodamine B.
FIG. 9 is a sample of the preparation of example 4 (CoCu) 3 O 4 XRD pattern of the oxide. As can be seen from the figure: (CoCu) 3 O 4 Diffraction peaks correspond to CoO (PDF # 78-0431) and CoCo 2 O 4 (PDF # 80-1545). FIG. 10 shows the composition of example 4 (CoCu) 3 O 4 Degradation profile of high entropy oxide on organic contaminants (rhodamine B) under low temperature conditions. As can be seen from the figure: within 5 minutes (CoCu) at 5℃and 10 ℃ 3 O 4 The removal rate of rhodamine B is 8 percent and 18 percent respectively. The reaction rates were 0.08 min -1 And 0.16 min -1 。
Example 5
Soluble cobalt nitrate hexahydrate 5.8 g/L, copper nitrate trihydrate 4.8 g/L, zinc nitrate hexahydrate 6 g/L, manganese nitrate tetrahydrate 5g/L and magnesium nitrate hexahydrate 5g/L are dissolved in 40mL deionized water, and stirred until dissolved to obtain solution A. Next, 6.4. 6.4 g/L sodium hydroxide and 6.8. 6.8 g/L sodium carbonate were dissolved in 40: 40mL deionized water to give solution B. Slowly pouring the solution B into the solution A, uniformly stirring, and aging for 0.5 to h to obtain the suspension mixed solution C. Finally, the suspension C mixed solution is put into a hydrothermal reaction kettle to carry out a high-temperature hydrothermal reaction, and the reaction temperature is the same as that of the suspension C mixed solution120℃and a reaction time of 12 h. And then taking out, centrifuging, washing with pure water in sequence, and drying at 120 ℃ in vacuum. Thus, nitrate (CoCuZnMnMg) 3 O 4 High entropy oxide.
Weighing 5 mg consists of nitrate (CoCuZnMnMg) 3 O 4 The high entropy oxide is placed in 50 mL organic pollutant (rhodamine B) and stirred uniformly, and the concentration of the rhodamine B is 10 mg/L. And (3) controlling the temperature condition by adopting a condensate water low-temperature box, adding PMS of 15.3 and mg when the water temperature is stabilized to 5 ℃ or 10 ℃, timing and taking a point, and then transferring to an ultraviolet-visible spectrophotometer to test the concentration of rhodamine B.
FIG. 11 is a schematic diagram of the composition of nitrate (CoCuZnMnMg) prepared in example 5 3 O 4 XRD pattern of high entropy oxide. As can be seen from the figure: (CoCuZnMnMg) 3 O 4 Diffraction peaks correspond to CoO (PDF # 78-0431) and CoCo 2 O 4 (PDF # 80-1545). FIG. 12 is a graph of the nitrate composition (CoCuZnMnMg) prepared in example 5 3 O 4 Degradation profile of high entropy oxide on organic contaminants (rhodamine B) under low temperature conditions. As can be seen from the figure: consists of nitrate (CoCuZnMnMg) at 5 ℃ and 10 DEG C 3 O 4 The removal rates for rhodamine B were 30% and 57%, respectively.
Example 6
Soluble cobalt acetate tetrahydrate 6 g/L, copper acetate monohydrate 4 g/L, zinc acetate dihydrate 4.4 g/L, manganese acetate tetrahydrate 4.8 g/L and magnesium acetate tetrahydrate 4.4 g/L are dissolved in 40mL absolute ethanol solution, and stirred until the solution is dissolved to obtain solution A. Next, 6.4. 6.4 g/L sodium hydroxide and 6.8. 6.8 g/L sodium carbonate were dissolved in 40: 40mL anhydrous ethanol solution to obtain solution B. Slowly pouring the solution B into the solution A, uniformly stirring, and aging for 0.5 to h to obtain the suspension mixed solution C. And finally, placing the C suspension mixed solution into a hydrothermal reaction kettle for carrying out a hydrothermal reaction, wherein the reaction temperature is 120 ℃, and the reaction time is 12 h. And then taking out, centrifuging, washing with pure water in sequence, and drying at 120 ℃ in vacuum. The solvent is absolute ethanol (CoCuZnMnMg) 3 O 4 High entropy oxide.
Weighing 5 mg solvent as absolute ethanol (CoCuZnMnMg) 3 O 4 The high entropy oxide is placed in 50 mL organic pollutant (rhodamine B) and stirred uniformly, and the concentration of the rhodamine B is 10 mg/L. And (3) controlling the temperature condition by adopting a condensate water low-temperature box, adding PMS of 15.3 and mg when the water temperature is stabilized to 5 ℃ or 10 ℃, timing and taking a point, and then transferring to an ultraviolet-visible spectrophotometer to test the concentration of rhodamine B.
FIG. 13 is a graph of the solvent of example 6 in absolute ethanol (CoCuZnMnMg) 3 O 4 XRD pattern of high entropy oxide. As can be seen from the figure: absolute ethanol synthesized (CoCuZnMnMg) 3 O 4 Diffraction peaks do not correspond to CoO (PDF # 78-0431) and CoCo 2 O 4 (PDF # 80-1545) and relatively weak diffraction peak intensity, indicating its low crystallization property, FIG. 14 is a graph of the solvent prepared in example 6 as absolute ethanol (CoCuZnMnMg) 3 O 4 Degradation profile of high entropy oxide on organic contaminants (rhodamine B) under low temperature conditions. As can be seen from the figure: the solvent was absolute ethanol (CoCuZnMnMg) at 5℃and 10 ℃ 3 O 4 The removal rates of rhodamine B are 8% and 12%, respectively. The reaction rates were 0.02 min -1 And 0.05 min -1 。
Example 7
Using commercially available tricobalt tetraoxide (Co 3 O 4 ) Is used for degrading organic pollutants. Weigh 5 mg Co 3 O 4 The mixture was stirred uniformly in 50 mL organic pollutant (rhodamine B) at a concentration of 10 mg/L. And (3) controlling the temperature condition by adopting a condensate water low-temperature box, adding PMS of 15.3 and mg when the water temperature is stabilized to 5 ℃ or 10 ℃, timing and taking a point, and then transferring to an ultraviolet-visible spectrophotometer to test the concentration of rhodamine B.
FIG. 15 is a graph of Co used in example 7 3 O 4 Degradation profile for organic contaminants (rhodamine B) at low temperature. As can be seen from the figure: co at 5 ℃ and 10 DEG C 3 O 4 The removal rate of rhodamine B is 15% and 19%, respectively. The reaction rates were 0.03min -1 And 0.05 min -1 。

Claims (6)

1.(CoCuZnMnMg) 3 O 4 High entropy oxidationThe use of a compound for the removal of contaminants by activating a polysulfide, characterized by (CoCuZnMnMg) 3 O 4 The preparation method of the high-entropy oxide comprises the following steps:
(1) Under the condition of stirring at room temperature, dissolving soluble cobalt salt, copper salt, zinc salt, manganese salt and magnesium salt in aqueous solution, and stirring until the soluble cobalt salt, copper salt, zinc salt, manganese salt and magnesium salt are dissolved to obtain solution A;
(2) Under the condition of stirring at room temperature, sodium hydroxide and sodium carbonate are dissolved in an aqueous solution to obtain a solution B, the solution B is slowly poured into the solution A, under the condition of strong stirring, a suspension mixed solution C is obtained, and then the solution C is aged for 0.5-2 h;
(3) Carrying out a hydrothermal reaction on the suspension mixed solution C for 12-48 hours at the temperature of 80-160 ℃; then taking out, centrifuging, washing with pure water, and vacuum drying to obtain (CoCuZnMnMg) 3 O 4 High entropy oxide, centrifuging, and oven drying to obtain (CoCuZnMnMg) 3 O 4 High entropy oxide.
2. The use according to claim 1, wherein the contaminant is a rhodamine B-containing contaminant, the concentration of rhodamine B being 5-20 mg/L; the persulfate comprises persulfate PMS, and the addition amount of the persulfate PMS is 5-20mg/ml.
3. The use according to claim 2, characterized in that (CoCuZnMnMg) 3 O 4 The addition amount of the high-entropy oxide is 0.05-5g/L; said (CoCuZnMnMg) 3 O 4 In the process of removing sewage, the temperature of the sewage is controlled to be 1-10 ℃.
4. The use according to claim 1, wherein the soluble cobalt, copper, zinc, manganese, magnesium salts of step (1) are cobalt acetate tetrahydrate, copper acetate monohydrate, zinc acetate dihydrate, manganese acetate tetrahydrate, magnesium acetate tetrahydrate, respectively.
5. The use according to claim 1, wherein the contents of the components in step (1) are as follows: 5-10 g/L of cobalt acetate tetrahydrate, 4-8 g/L of copper acetate monohydrate, 4.4-8.8 g/L of zinc acetate dihydrate, 4.8-9.6 g/L of manganese acetate tetrahydrate and 4.3-8.6 g/L of magnesium acetate tetrahydrate.
6. The use according to claim 1, wherein the contents of the components in step (2) are as follows: 6-10 g/L of sodium hydroxide and 6-10 g/L of sodium carbonate.
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