Preparation method and applications of iron-carbon micro-electrolysis material for maintaining long-term catalytic activity of Fenton system

Abstract

The invention provides a preparation method and applications of an iron-carbon micro-electrolysis material for maintaining the long-term catalytic activity of a Fenton system. According to the present invention, the catalyst is derived from an iron metal organic framework (Fe-MOFs) and montmorillonite; after Fe-MOFs prepared by a mechanochemical method are mixed with montmorillonite, high temperature carbonizing is performed to form a core-shell type iron-carbon filler micro-electrolysis material (Fe@C-MMT) dispersed between the montmorillonite sheet structures; the inefficient decomposition of hydrogen peroxide can be delayed by highly dispersing the Fe@C-MMT material in the water sample, and the hydroxyl radicals are selectively generated, such that the hydrogen peroxide in the system has long-term oxidation ability; the catalyst has a certain pH value adjustment ability, wherein organic pollutants can be efficiently degraded when the initial pH value is 3-6.5; and the catalyst has good stability, can be reused multiple times, and is suitable for removing refractory organic pollutants such as phenol, methyl orange and the like in environmental water samples by advanced oxidation technology Fenton reactions.

Description

technical field [0001] The invention belongs to the technical field of highly toxic pollutant treatment, and relates to the preparation of a highly dispersed core-shell type iron-carbon micro-electrolysis nanomaterial that maintains the long-term catalytic activity of a Fenton system and its application as a heterogeneous Fenton catalyst to degrade pollutants. Background technique [0002] China is in a period of rapid economic growth. The rapid development of industry is the guarantee of rapid economic growth, but at the same time, a large amount of waste water is discharged in industrial production. Industrial wastewater has the characteristics of many types of pollutants, complex components, high COD concentration, poor biodegradability, and high toxicity. If it is not effectively and comprehensively controlled, it will cause serious environmental pollution and ecological damage, endanger people's health, and hinder the further sustainable development of the economy. The...

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Problems solved by technology

However, since the optimal pH of micro-electrolysis operation is less than 4, in a more acidic solution, the iron exposed on the edge of the filler is easily oxidized by the dissolved oxygen in the water, aggravating the corrosion and loss of iron, and increasing the iron ion content in the water sample

Although these iron ions can be used as co-coagulants to remove organic pollutants through flocculation and precipitation, the particles in these sediments and wastewater will adhere to the surface of fillers (especially zero-valent iron) to form a passivation film that blocks the interaction between fillers and wastewater. Effective contact, resulting in a decrease in the activity of the filler, greatly shortening the service life of the iron-carbon filler

Therefore, most of the commercialized iron-carbon fillers need to be replaced or regenerated after half a year to one year of use, which increases the operating cost of the enterprise.

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