A kind of electrolytic preparation optimization method of potassium ferrate

An optimization method, potassium ferrate technology, applied in the direction of electrolysis components, electrolysis process, electrode shape/type, etc., can solve the problems of large power consumption and low current efficiency, and achieve extended service life, high current efficiency, and reduced resistance Effect

Active Publication Date: 2020-08-04
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0012] In order to overcome the problems of anode passivation, low current efficiency, decomposition and hydrolysis after the concentration of ferrate increases and excessive power consumption in the preparation process in the existing electrolytic preparation method, the present invention provides an anode passivation, current efficiency An optimized method for the electrolytic preparation of potassium ferrate with higher power consumption and lower power consumption

Method used

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  • A kind of electrolytic preparation optimization method of potassium ferrate
  • A kind of electrolytic preparation optimization method of potassium ferrate
  • A kind of electrolytic preparation optimization method of potassium ferrate

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Embodiment 1

[0047] First, 14mol / L NaOH solution was injected into the cathode chamber and the anode chamber respectively, and about 70mL of electrolyte was added to the anode chamber; 130mL was added to a single cathode chamber. Then place the electrolytic cell in a constant temperature water bath at 40°C. The anode uses ten iron wires with a diameter of 0.3mm, each with a length of about 90cm, wound into a hollow spiral cylinder, the hollow diameter is 1cm, and the number of turns of the iron wire is 26 turns. Around, the effective immersion area is about 84.82cm 2 , the cathode is a platinum electrode of 10mm*10mm*0.1mm. A square wave alternating current with a period of 15s is superimposed on the electrode (such as figure 2 ), the positive pulse current is 933.05mA, and the duration of a single cycle is 13.6364s; the negative pulse current is -93.305mA, and the duration of a single cycle is 1.3636s. Finally, 1 mL of anolyte was taken every hour to measure the concentration of ferrat...

Embodiment 2

[0051] In the anolyte of embodiment 1, add 0.01mol / LNaH 2 PO 4 , the rest of the conditions are the same as in Example 1, and the calculated electrosynthesis rate is 8.368g L -1 / h -1 Table 2 shows the ferrate concentration and current efficiency per hour in Example 2.

[0052] Electrolysis time / h 1h 2h 3h 4h 5h 6h CNa2Fe04(mol / L 0.0556 0.0938 0.139 0.174 0.2102 0.2006 Current efficiency% 73.43 60.187 57.7 52.5 49.05 37.87

[0053] Table 2.

Embodiment 3

[0055] First, use tap water to configure 16mol / L NaOH solution and inject it into the cathode chamber and the anode chamber respectively, of which about 70mL electrolyte is added to the anode chamber, and 0.015mol / L NaH is added to the anode chamber at the same time 2 PO 4 Add 130mL to a single cathode chamber, and then place the electrolytic cell in a constant temperature water bath at 40°C. The anode uses ten iron wires with a diameter of 0.3mm, each with a length of about 90cm, wound into a hollow spiral cylinder, and the hollow diameter is 1cm , the number of iron wire turns is about 26 turns, and the effective immersion area is about 84.82cm 2 , the cathode is a platinum electrode of 10mm*10mm*0.1mm. A square wave alternating current with a period of 15s is superimposed on the electrode (such as figure 2 ), the positive pulse current is 933.05mA, and the duration of a single cycle is 13.6364s; the negative pulse current is -93.305mA, and the duration of a single cycle ...

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Abstract

A novel electrolytic preparation optimizing method for potassium ferrate is characterized in that a bicathode electrolysis cell is adopted, an anode adopts a hollow spiral cylinder, a negative pulse alternating current is superimposed to remove a part of an oxide film formed by the side reaction of the anode, and sodium dihydrogen phosphate is added to an electrolyte to effectively prevent iron ions in the solution from hydrolyzing and precipitating in order to prevent the tendency of decomposition of the ferrate to ferric iron, so the peak concentration and the current efficiency of the ferrate are greatly increased, and the preservation cycle of the ferrate after the preparation is prolonged. The method has the advantages of low energy consumption, high current efficiency, simple process, high adaptation space capability of the anode material due to the anode material bending as demanded, and realization of long preservation cycle of the product without any treatment.

Description

technical field [0001] The invention belongs to the technical field of electrochemical preparation of potassium ferrate, and in particular relates to optimization of anode materials, selection of alternating current types, optimization of electrolyte and the like. Background technique [0002] Ferrate is a new type of water purifying agent integrating oxidation, flocculation and disinfection. Compared with traditional water purifiers, such as chlorine-based disinfectants, ozone, etc., its oxidation-reduction potential is the highest. Chlorine-based disinfectants, as a class of classic disinfectants, can effectively kill bacteria and viruses in water, but in most cases, this widely used disinfectant will lead to the formation of disinfection by-products in water, such as carcinogenic Trihalomethane, etc. Ozone is an oxidizing agent. In addition to having a good oxidation and disinfection effect, it is also excellent in deodorization. However, when ozone is used as a water t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/14C25B11/02C25B13/04C25B15/02
CPCC25B1/14C25B11/02C25B13/04C25B15/02
Inventor 王红宇束集
Owner ZHEJIANG UNIV OF TECH
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