A kind of fe-co-ac catalytic material and preparation method thereof

Abstract

A Fe‑Co‑AC catalytic material and its preparation method, which relates to the field of activated carbon supported catalysts. The preparation method is to soak the activated carbon in an acidic aqueous solution, wash it with water, and dry it to obtain pretreated activated carbon; combine the pretreated activated carbon with ferric nitrate Solution, cobalt nitrate solution, and citric acid are mixed, stir evenly to obtain a mixed reaction liquid, adjust the pH value of the mixed reaction liquid, and then react at 70 to 90°C to obtain a slurry; evaporate the slurry to dryness at 100 to 120°C to obtain a solid , dry to obtain activated carbon solid; add P to the activated carbon solid 2 O 5 Powder, mix evenly, roast at 300-700°C, and cool to obtain. This preparation method has simple process, convenient operation and low cost, and the prepared Fe‑Co‑AC catalytic material can be used for electrocatalytic degradation of chloride ion wastewater without the need for In addition, by adding other oxidants, the electrolysis efficiency is high and the chloride ion degradation rate is high, which is conducive to large-scale industrial application.

Description

technical field [0001] The invention relates to the field of activated carbon supported catalysts, in particular to a Fe-Co-AC catalytic material and a preparation method thereof. Background technique [0002] With the development of my country's economic construction, the demand for water resources has increased sharply, and at the same time, the situation of water pollution has become more and more serious. my country's "Integrated Wastewater Discharge Standard (GB8978-1996)" does not limit the discharge of chlorides. A large amount of chlorides enters the environment and will cause serious harm to the environment and organisms. At present, the sources, hazards and existing treatment methods of chloride ions are roughly as follows: [0003] Sources and hazards of chloride ions: Cl - Compatible with Na + , Ca 2+ , Mg 2+ , K + Such cations form chlorides. There are two types of sources of chloride in surface water: natural sources and anthropogenic sources. There are ...

AI Technical Summary

Problems solved by technology

But at present, this technology is still in the laboratory stage, and it is rarely industrialized. The main reason is that there are still some limitations in the electro-adsorption technology: ① In order to ensure that the electrodes have good conductivity, the electrodes used in the electro-adsorption technology are very thin. The thickness of the electrode is generally about 1-4mm, which is inconvenient for industrial operation; ②When the electrode is made of ordinary adsorbent material, the adsorbent material is made into a piece of plate, the total specific surface area cannot be large, and the adsorption effect is not obvious; ③Electrode material Its own performance seriously affects the effect of electro-adsorption technology, and it is difficult for ordinary electrode materials to meet the requirements of high specific surface area, high conductivity, and high cost performance at the same time; ④The concentration of chloride ions in wastewater that can be treated by electro-adsorption technology is far lower than that in industrial wastewater The actual concentration, so it cannot provide good technical support for industrialization

This invention has the following defects: 1. the whole anode of this invention does not use an effective chloride ion oxidation catalyst, and it can be seen that this invention does not electrochemically oxidize chloride ions into Chlorine gas is removed, but only the chlorine ions are adsorbed and concentrated on the activated carbon through the positive charge and the adsorption of activated carbon to achieve the purpose of removing chlorine ions

However, in this method, the surface of every activated carbon does not touch the anode titanium plate all the time, that is to say, not every surface of activated carbon is positively charged, so the electrosorption efficiency of the whole device is not very high.

And activated carbon adsorption capacity is limited, is easy to saturation, so it is difficult to remove the chlorine ion waste water of high concentration, finds out by embodiment, the chloride ion concentration of its test solution is only 1000mg / l, and its electric adsorption time is too long, needs 2 If the concentration of chlorine ions in the wastewater is too high, a large amount of activated carbon will inevitably be used when using this method to treat chloride ion wastewater, and the treatment time will be longer

② Metal titanium is easily passivated when it is energized for a long time in a chloride ion environment, the surface resistance increases, and the electrical efficiency decreases, which has a great impact on the transfer of positive charges on the electrode surface

Moreover, the anode titanium plate of this invention is a plate electrode, no matter how it is arranged, the surface area of ​​the anode will be limited, the surface area cannot be very large, and the anode electrolysis efficiency cannot be very high

The above defects limit the large-scale application of this method in the actual treatment of wastewater.

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