Non-homogeneous-phase Fenton catalyst with magnetism and preparing method and application thereof

Abstract

The invention relates to a non-homogeneous-phase Fenton catalyst with magnetism. The non-homogeneous-phase Fenton catalyst is a nuclear shell type microsphere Fe3O4@rGO@TiO2 of a three-layer structure. The submicron-level Fe3O4 microsphere serves as the inner core, the outmost layer is TiO2 small nanometer particles, and the Fe3O4 microsphere and the TiO2 small nanometer particles are bonded together through an rGO layer with the thickness ranging from 2 nm to 5 nm. The Fe3O4 microsphere is formed by stacking Fe3O4 small nanometer particles with the grain size ranging from 15 nm to 30 nm, and the microsphere grain size ranges from 300 nm to 400 nm. The grain size of the TiO2 small nanometer particles ranges from 5 nm to 15 nm. The non-homogeneous-phase Fenton catalyst is prepared in a neutral environment or Fenton reaction is conducted, the dissolution and losses of ferric salt are greatly reduced, efficient recycling of the catalyst is achieved, and meanwhile multi-time repeated use of the catalyst is guaranteed; the catalyst has good superparamagnetism, the magnetic response performance is excellent, and the catalyst is easy to recycle and can be separated completely within about 30 s under the action of an external magnetic field; the utilization rate of visible light is increased; furthermore, the material surface energy is lowered, the catalyst is not prone to agglomeration, dispersity is maintained, and thus the utilization rate of the catalyst is increased.

Description

technical field [0001] The invention relates to the fields of nanometer material science and environmental science, in particular to a Fe 3 o 4 GOTiO 2 Heterogeneous Fenton-like catalyst and preparation method thereof. Background technique [0002] Methylene blue (MB), rhodamine B, methyl red and other substances are the main components of dye wastewater, which are highly toxic and difficult to degrade, and will cause great harm to the human body. At present, physical adsorption, flocculation sedimentation, reverse osmosis, chemical oxidation, etc. are commonly used to treat dye wastewater. Compared with other treatment methods, chemical oxidation can mineralize stable and refractory organic pollutants to form CO 2 、H 2 Small molecular substances such as O and inorganic substances that are not harmful to the environment can fundamentally solve the problem of environmental pollution, so they have attracted more attention. In the chemical oxidation method, Fenton technol...

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Problems solved by technology

[0007] In summary, the magnetic nanomaterials currently used as Fenton system catalysts have the following problems: 1) Nanoparticles are prone to agglomeration in solution, which reduces the effective specific surface area in contact with organic substances and reduces the reaction efficiency; 2) Using the magnetic heterogeneous catalyst alone under the condition of neutral pH, Fe 3+ reduced to Fe 2+ The rate is low and cannot effectively catalyze the decomposition of H 2 o 2 The formation of HO indirectly affects the degradation efficiency of organic pollutants; 3) With the help of external conditions such as light energy, electric energy or ultrasound, the catalytic efficiency of the Fenton system can be improved

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