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CN-121988322-A - Magnetic gangue catalytic material and preparation method and application thereof

CN121988322ACN 121988322 ACN121988322 ACN 121988322ACN-121988322-A

Abstract

The invention discloses a magnetic gangue catalytic material, and a preparation method and application thereof. The preparation method of the magnetic gangue catalytic material comprises the steps of carrying out primary crushing on the gangue, then grinding to obtain the flaked gangue, dissolving FeCl 2 、NH 4 Cl and NH 3 ·H 2 O in water to obtain a mixed solution, and then adding the flaked gangue into the mixed solution to carry out hydrothermal reaction to obtain the magnetic gangue catalytic material. The method adopts grinding mechanical stripping and activation and hydrothermal synthesis processes to realize the tight combination of ferrite and the surface active sites of coal gangue, thereby realizing the efficient activation of persulfate and the deep treatment of organic pollutants in water and fields.

Inventors

  • LI CHUNQUAN
  • SUN ZHIMING
  • YUAN FANG
  • Dong Wenze

Assignees

  • 中国矿业大学(北京)内蒙古研究院
  • 中国矿业大学(北京)

Dates

Publication Date
20260508
Application Date
20251211

Claims (10)

  1. 1. The preparation method of the magnetic gangue catalytic material is characterized by comprising the following steps of: (1) Primarily crushing the gangue, and then grinding to obtain the flaked gangue; (2) And then adding the flaked coal gangue into the mixed solution to perform hydrothermal reaction to obtain the magnetic coal gangue catalytic material.
  2. 2. The method for preparing the magnetic gangue catalytic material according to claim 1, wherein in the step (1), the carbon content of the gangue is 10% -30%.
  3. 3. The method for preparing a magnetic gangue catalytic material according to claim 1, wherein in the step (1), the primary breaking particle size of the gangue is 10 mm or less; and/or the granularity of the flaked coal gangue is less than or equal to 200 meshes; And/or the stripping rate of the gangue is more than 70%.
  4. 4. The method for preparing a magnetic gangue catalytic material according to claim 1, wherein in step (2), the FeCl 2 comprises FeCl 2 ·4H 2 O; And/or the ratio of FeCl 2 、NH 4 Cl to NH 3 ·H 2 O is 1-5 mmol:1.5-5.5 mmol:1-5 mL.
  5. 5. The method for preparing the magnetic gangue catalytic material according to claim 1, wherein in the step (2), the ratio of FeCl 2 to the flaked gangue is 1 mmol:70-800 mg.
  6. 6. The method for preparing a magnetic gangue catalytic material according to claim 1, wherein in the step (2), the temperature of the hydrothermal reaction is 150-200 ℃; And/or the heating rate and the cooling rate of the hydrothermal reaction are respectively and independently 0.5-20 ℃ per minute; and/or the hydrothermal reaction time is 12-24 hours; and/or, washing and drying after the hydrothermal reaction.
  7. 7. The magnetic gangue catalytic material is characterized by being prepared by adopting the preparation method of any one of claims 1-6, and comprises a flaked gangue and Fe 3 O 4-x loaded on the flaked gangue.
  8. 8. The magnetic gangue catalytic material as claimed in claim 7, wherein x in the Fe 3 O 4-x is 0 to 1; And/or in the magnetic gangue catalytic material, the ratio of the mass of Fe 3 O 4-x to the mass of the flaked gangue is 10% -100%.
  9. 9. Use of a magnetic gangue catalytic material as claimed in claim 7 or 8 for catalyzing the degradation of organic contaminants by persulfates.
  10. 10. Use according to claim 9 for degrading organic pollutants in bodies of water or soil; and/or for degrading organic contaminants of the polycyclic aromatic hydrocarbon type.

Description

Magnetic gangue catalytic material and preparation method and application thereof Technical Field The invention relates to the field of catalytic materials, in particular to a magnetic gangue catalytic material, and a preparation method and application thereof. Background Gangue is a mixed rock mass produced in the processes of well construction, development and tunneling, coal mining, coal washing and selecting and the like of a coal mine, and is often regarded as industrial solid waste. In China, coal gangue is generally treated by an on-site stacking method, so that a large amount of gangue mountain is formed, not only is land resources occupied and geological disaster hidden danger brought, but also the environment of the atmosphere, soil and water is endangered. Polycyclic aromatic hydrocarbon organic pollutants including phenol, naphthalene, phenanthrene, anthracene, benzopyrene and the like cause serious damage to the ecological environment of the industrial area. Based on sulfate radicals (SO 4•) The advanced oxidation technology of (2) is a research hot spot in the fields of water treatment, environmental restoration and the like in recent years, and is mainly based on the fact that persulfate generates high-activity free radicals (such as sulfate radical SO 4 under the catalysis effect) •And hydroxyl radical OH) and can degrade organic pollutant effectively. The catalytic mode of persulfate mainly comprises energy input type activation (photo, electric, thermal, ultrasonic and microwave activation), alkali activation, transition metal activation, carbon-based material activation and the like. The energy input type activation is to break O-O bond in persulfate by using light, electricity, heat and other conditions to generate sulfate radical SO 4•The alkali activation is to promote persulfate decomposition to generate active oxygen species by adjusting the pH value to an alkaline environment, but the change of the pH value of the environment can cause secondary pollution and has higher requirement on corrosion resistance of equipment, the transition metal activation uses transition metal ions (such as Fe 2+、Co2+、Mn2+ and the like) or oxides thereof to activate persulfate through an electron transfer mechanism, but can cause metal ion pollution, the problem of metal ion recovery needs to be solved, and the carbon-based material activation is to provide active site adsorption activation by utilizing a carbon material and promote persulfate decomposition through electron transfer, but also has the problems of high material preparation cost, complex process, large scale application difficulty and the like. Disclosure of Invention The invention is based on the discovery and recognition of the following facts and problems of high energy consumption, high cost, secondary pollution, high requirement on corrosion resistance of equipment, metal ion pollution, complex process, large-scale application difficulty and the like of a persulfate catalytic mode at present. The persulfate catalytic material prepared by using the coal gangue as the raw material has the dual significance of resource utilization and environmental control. The gangue has wide sources and almost no raw material cost, greatly reduces the preparation cost of the catalytic material, and the inorganic mineral components (such as kaolinite and quartz) of the gangue can provide a porous carrier structure, so that the stability and the dispersibility of the catalyst are enhanced. The coal industrial gathering area fully utilizes coal-based waste in the coal industrial gathering area to convert the coal-based waste into a material for purifying organic pollutants according to the principles of local material taking, waste pollution control and the like, and the persulfate catalyst prepared from the coal gangue has both environmental benefit and practical value, accords with the recycling economy concept, and provides an important approach for high-value utilization of solid waste. The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a magnetic gangue catalytic material, a preparation method and application thereof, and adopts mechanical stripping and activation and hydrothermal synthesis processes to realize the tight combination of ferrite and active sites on the surface of the gangue, thereby realizing the efficient activation of persulfate and the deep treatment of organic pollutants in water and fields. The embodiment of the invention provides a preparation method of a magnetic gangue catalytic material, which comprises the following steps: (1) Primarily crushing the gangue, and then grinding to obtain the flaked gangue; (2) And then adding the flaked coal gangue into the mixed solution to perform hydrothermal reaction to obtain the magnetic coal gangue catalytic material. The preparation method of the magnetic gangue catalytic materia