Preparation method and application of 3D printing monolithic catalyst applied to Fenton-like/persulfate system

Abstract

The invention discloses a preparation method and application of a 3D printing monolithic catalyst applied to a Fenton-like / persulfate system. The preparation method comprises the steps that a chemical reduction method is adopted, metal salt serves as a precursor, a transition metal nano material is prepared through reduction, then the transition metal nano material is loaded on a 3D printing carrier, and the monolithic catalyst applicable to the Fenton-like / persulfate system is obtained. The active metal oxide nano material is in an irregular polyhedron shape, a large number of gully-shaped cracks are formed in the surface, the roughness and the specific surface area of the active metal oxide nano material are effectively increased due to surface defects, and more active components are provided. The catalyst provided by the invention can quickly and efficiently remove refractory organics in wastewater. The prepared monolithic catalyst has the advantages of being high in catalytic activity, good in stability, controllable in structure, beneficial to recovery and the like in a Fenton-like / persulfate system, and can be applied to the fields of sewage treatment and the like.

Description

technical field [0001] The invention relates to a preparation method and application of a catalyst, in particular to a preparation method and application of a 3D printed monolithic catalyst applied to a Fenton-like / persulfate system. Background technique [0002] In recent years, with the rapid development of the medical industry, the widespread use of antibiotics has caused a large amount of antibiotic residues to be discharged into water bodies around the world, causing water environmental pollution. The presence of antibiotics in the environment may lead to the generation of antibiotic resistance genes (ARGs) and the acquisition of resistance by microbial pathogens, resulting in the emergence of antibiotic-resistant bacteria or multi-antibiotic-resistant bacteria, posing a significant threat to human health and ecosystems. Generally, antibiotics are refractory organic substances that are difficult to be metabolized by humans and animals, so it is extremely important to se...

AI Technical Summary

Problems solved by technology

However, homogeneous catalytic systems have obvious limitations

First, metal ions are difficult to recycle in the reaction system

Second, when the high-concentration antibiotic wastewater is effectively removed, the demand for metal ions increases significantly, which leads to a large amount of metal ions remaining in the reaction system, causing secondary pollution

Third, the existence form of metal ions in water is greatly affected by pH and other coexisting substances. Metal ions may precipitate under alkaline conditions, while hydrated species will form under acidic conditions, reducing the activation performance of metal ions.

However, these nanoparticulate catalysts have a limited number of cycles and are difficult to separate from the system. They must be separated and recovered by post-treatment methods such as filtration, centrifugation, and flocculation, which limits their application.

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