Preparation method and application of core-shell type iron-carbon microelectrolysis material high-efficiency Fenton Catalyst

Abstract

The invention provides a core-shell type iron-carbon microelectrolysis (Fe-Pd/C) nanocatalyst for catalytically degrading high-toxicity organic pollutants in an environmental water sample, and a preparation method thereof. The catalyst is derived from an iron metal-organic framework material (Fe-MOFs). The Fe-MOFs material is prepared by a mechanochemical technology, and undergoes high-temperaturecarbonization to form the core-shell Fe-C microelectrolysis material composed of a graphitized carbon shell (C), zero-valent iron (Fe<0>) and a nano-palladium composite material. A zero-valent iron anode of the core-shell Fe-Pd/C continuously transports electrons to a carbon cathode and releases Fe<2+> in a water sample; the protection of the carbon shell prevents a product obtained after the hydrolysis of iron ions in the solution from adhering to the surface of the zero-valent iron, so a micro-electrolysis reaction is not affected; and nano-palladium particles in the core can promote the conversion of Fe<3+>/Fe<2+> and the pH value of the surface of the catalyst, so a Fenton reaction can be carried out in a pH range of 3-6. The catalyst has a good stability, and can be reused many times, and is very suitable for removing phenol and other pollutants in the environmental water samples by an advanced oxidation technology Fenton reaction.

Description

technical field [0001] The invention belongs to the technical field of highly toxic pollutant treatment, and relates to the large-scale preparation of a core-shell type iron-carbon micro-electrolysis nanometer material and its application as a Fenton catalyst to degrade pollutants. Background technique [0002] Micro-electrolysis technology is currently an ideal process for treating high-concentration organic wastewater, also known as internal electrolysis. It uses the micro-electrolytic material filled in the wastewater to generate a 1.2V potential difference to electrolyze the wastewater to degrade organic pollutants without electricity. During the reaction, nascent Fe was produced at the metal anode 2+ , Atomic H is generated at the carbon cathode. They have high chemical activity and can change the structure and characteristics of many organic substances in wastewater, causing chain scission and ring opening of organic substances. However, the reduction of iron-carbon ...

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Problems solved by technology

[0003] Traditionally, the micro-electrolysis materials used in the micro-electrolysis process are generally iron filings and charcoal, which need to be activated with acid and alkali before use. During the use, it is easy to passivate and harden, and because iron and charcoal are in physical contact, it is easy to form a bond between them. The isolation layer prevents micro-electrolysis from continuing and loses its function, which leads to frequent replacement of micro-electrolysis materials, which not only has a large workload and high cost, but also affects the treatment effect and efficiency of wastewater

In addition, the small surface area of ​​traditional micro-electrolysis materials also makes wastewater treatment take a long time, increasing the investment cost per ton of water, which seriously affects the utilization and promotion of micro-electrolysis processes

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