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CN-119824290-B - Multiphase high-entropy alloy and preparation method and application thereof

CN119824290BCN 119824290 BCN119824290 BCN 119824290BCN-119824290-B

Abstract

The invention discloses a multiphase high-entropy alloy and a preparation method and application thereof, belonging to the technical field of removing organic pollutants by efficiently activating PMS (permanent magnet synchronous motor) by a catalyst; the multiphase high-entropy alloy comprises five or more metal atoms of Co, cu, mn, al, la or Cr, wherein the atomic ratio of the multiphase high-entropy alloy is equal mole, hydrated nitrate according to the metal atom composition and the ratio relation is added into a solvent to prepare a precursor solution, and the precursor solution is subjected to pyrolysis, drying, grinding and calcination in sequence to finally prepare the multiphase high-entropy alloy. The invention provides a method for evaluating the effect of activating PMS and degrading and removing organic pollutants by high-entropy alloy CoCuMnAlLaCr, which can achieve excellent activating effect and catalyst stability at the same time under the condition of no external energy input, and also provides a method for removing a part of incompletely mineralized substances which always exist in a small amount of overflowed metal ions and in a high-grade oxidation process under the condition of normal temperature and normal pressure.

Inventors

  • CHEN JIAPING
  • Jin Tenghui
  • XU JIAJIE

Assignees

  • 深圳大学

Dates

Publication Date
20260512
Application Date
20250107

Claims (6)

  1. 1. A preparation method of a multiphase high-entropy alloy is characterized in that the metal atomic composition comprises CoCuMnAlLaCr, coCuMnAlCr, coCuAlLaCr, coCuMnAlLa or CoCuMnLaCr; the atomic ratio of the multiphase high-entropy alloy is equimolar; The method comprises the following steps: Adding hydrated nitrate in the composition and proportioning relation of metal atoms into a solvent to prepare a precursor solution, wherein the solvent is a mixed solution of citric acid and absolute ethyl alcohol, and the hydrated nitrate of each metal atom is citric acid, absolute ethyl alcohol=0.418 mmol, and 4.18 mmol:50 mL; And (3) carrying out pyrolysis, drying, grinding and calcination on the precursor solution in sequence to finally prepare the multiphase high-entropy alloy.
  2. 2. A process for preparing a heterogeneous high entropy alloy according to claim 1, wherein the conditions during pyrolysis are pyrolysis in a water bath at a temperature of 90℃for 1 hour, and/or The conditions in the drying process are that the drying is carried out for 2 hours at 80 ℃ and/or The condition in the calcination process is that the calcination is carried out for 3 hours at 800-1100 ℃ in an argon atmosphere.
  3. 3. The use of the multiphase high entropy alloy prepared by the preparation method according to any one of claims 1-2 in the field of rapid and efficient activation of persulfates and simultaneous production of MnO 2 for coagulation removal of organic pollutants, characterized in that the multiphase high entropy alloy is used as a catalyst.
  4. 4. Use according to claim 3, characterized in that the organic contaminant is 2-chloro-4-ethylamino-6-isopropylamino-1, 3, 5-triazine.
  5. 5. The use according to claim 3, wherein the process of removing organic contaminants is: Adding the multiphase high-entropy alloy into a solution containing organic pollutants, and carrying out ultrasonic and stirring treatment to obtain a mixed solution; adding potassium hydrogen persulfate solution into the mixed solution, stirring and filtering.
  6. 6. The use according to claim 5, wherein the multiphase high entropy alloy is added in an amount of 0.0167-0.0333 g/L.

Description

Multiphase high-entropy alloy and preparation method and application thereof Technical Field The invention belongs to the technical field of removing organic pollutants by efficiently activating PMS (permanent magnet synchronous motor) by a catalyst, and particularly relates to a multiphase high-entropy alloy and a preparation method and application thereof. Background Advanced oxidation techniques (AOPs) are a promising class of techniques that promote the conversion mineralization of pollutants into harmless substances by generating free radicals with strong oxidizing properties to destroy the chemical structure of the pollutants. Peroxymonosulfate (peroxymonosulfate, PMS) is of great interest for its superior oxidizing ability, of the formula HSO 5-, usually in the form of the sodium salt (NaHSO 5) or potassium salt (KHSO 5). It can release sulfate radical (SO 4-. Cndot.) and hydroxyl radical (∙ OH) in water, and can quickly degrade pollutant in water by oxidation reaction. As an emerging environmental treatment technology, the activated PMS can generate sulfate radical (2.5-3.1V) with higher oxidation-reduction potential and the byproducts are mostly pollution-free sulfate, has wide application potential, and can greatly improve the removal efficiency of pollutants by researching different activation approaches. The method capable of directly activating the peroxymonosulfate mainly comprises thermal activation, alkali activation, radiation activation, transition metal activation, carbon-based material activation and the like. The transition metal activation can be further divided into homogeneous activation and heterogeneous activation, the homogeneous activation has limited practical value due to the difficulty in recovery and potential secondary pollution risk although the general activation efficiency is higher, and the transition metal catalysts such as single-atom catalysts, metal organic frameworks, metal oxides, layered Double Hydroxides (LDHs) and the like have been developed through intensive researches on metal material structures, so that the heterogeneous catalysis activation efficiency is effectively improved. However, always limited by antagonism between the catalytic activity and stability of the catalyst, it is more difficult for the design of single-or bimetallic materials to exhibit satisfactory performance in both dimensions. High-entropy alloys (High-Entropy Alloys, HEAs) are a novel class of alloy materials, typically consisting of five or more major elements combined in approximately the same atomic proportions. These alloys are unique in that they have a higher entropy value, which makes them more stable in forming solid solutions. At the same time, due to the diversity of its components, a unique cocktail effect and a synergistic effect between the different elements are exhibited, which provides more possible pathways and unexpected effects for the catalytic process. At present, the high-entropy alloy has less application in the field of PMS activation, and has very large adjustment space and development potential from the aspects of constituent elements of the high-entropy alloy and different alloy structures caused by the influence of the constituent elements so as to realize efficient PMS activation. From the standpoint of PMS activation, the first problem is that the energy consumption problem is that thermal activation, radiation activation, photocatalysis, electrocatalysis and ultrasonic catalysis can activate PMS very effectively without considering energy consumption, but this requires very high external energy input, which is difficult to put into practical production, and the second problem is that PMS activation is most important in terms of the relationship between the activation effect and the catalyst stability (i.e., preventing secondary pollution of metal), and the aforementioned single-atom catalyst, metal organic frame, metal oxide, layered double hydroxide and other material structures are limited to relatively single metal atom compositions, or there is a problem that the activation ability is limited, the free radical generating ability is limited, and the target pollutant cannot be degraded quickly and effectively, or there is a problem that the activity is very strong but the metal overflow cannot be ignored. In summary, for the development of high-entropy alloy, the application of the high-entropy alloy in the field of PMS activation is less at present, and meanwhile, some existing schemes for activating PMS by high-entropy alloy are limited to a single phase structure, so that the high-entropy alloy can have certain activity and stability, but can control the overflow of metal ions within a certain range under the condition of no energy input, but can not be reduced any more. Accordingly, there is a need to provide a multiphase high entropy alloy (CoCuMnAlLaCr) and a method for preparing the same that can be used for rapid and efficient activation of Per