CN1320171C - Lead dioxide electrode and preparing method thereof - Google Patents
Lead dioxide electrode and preparing method thereof Download PDFInfo
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- CN1320171C CN1320171C CNB2004100845678A CN200410084567A CN1320171C CN 1320171 C CN1320171 C CN 1320171C CN B2004100845678 A CNB2004100845678 A CN B2004100845678A CN 200410084567 A CN200410084567 A CN 200410084567A CN 1320171 C CN1320171 C CN 1320171C
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Abstract
The present invention belongs to the technical field of electrochemistry, particularly to a new lead dioxide electrode and a preparation method thereof. Lead dioxide powders, and polyfluortetraethylene or polypropylene microparticles are mixed according to a certain quality ratio, and then, the electrode is prepared by a tabletting technology. The method of the present invention belongs to a preparation method without base bodies; the present invention fundamentally solves the problems of the disengagement of plating, etc. The electrode has the advantages of high mechanical strength, favorable corrosion resistance, high electrochemistry activity and simple preparing technology. The electrode can be used as an anode to treat organic waste water, and the degradation effects are favorable.
Description
Technical field
The invention belongs to technical field of electrochemistry, be specifically related to a kind of lead dioxide electrode and preparation method thereof.
Background technology
PbO
2Electrode is as a kind of functional, low-cost insoluble anode material, and not only existing use value on chemical industry also has good application prospects in the environmental protection field.
PbO
2Electrode can be divided into matrix and no base electrode two classes.Traditional no matrix PbO
2Electrode is because bad mechanical strength is unsuitable for industrial application.That use at present generally is matrix PbO
2Electrode, wherein studying more is titanium base PbO
2Electrode.Titanium is the valve shaped metal, is good carriers to many electro catalytic activity materials, plating one deck conduction on the titanium base, anti-corrosion PbO
2After show good anode performance; But some crystal boundary slits can appear in coating, and the oxygen that produces during electrolysis sees through the crystal boundary slit oxidation matrix of coating, form the titanium oxide of poorly conductive, worsen electrode performance.In order to overcome the passivation of titanium in the long-time electrolysis production process, improve the job stability and the work-ing life of anode of lead dioxide, people are at titanium matrix and PbO
2Add the middle layer between the coating, to suppress the passivation of titanium.But this technology has increased the cost of manufacture and the process complexity of electrode, and can not fundamentally solve the problem of passivation of titanium base.In order to overcome these drawbacks, people manufacture experimently out a kind of novel ceramic matrix PbO again
2Electrode.Because there are not the matrix problem of passivation in solidity to corrosion, the non-conductive property of pottery; Yet low, the easy fragmentation of ceramic physical strength own can only be made the pole shape, and can not be made plate (sheet) shape, and this makes troubles for the design of electrolysis cells of scale operation.Tube wall owing to vitrified pipe requires that certain thickness is arranged simultaneously, the ceramic matrix deadweight is increased, and the high-temperature firing pottery is difficult, and the production cycle is long, and yield rate is low, causes its cost higher.Therefore, people further consider and adopt satisfactory mechanical property, stable chemical performance, surface can plate with the low ABS plastic of light weight, cost as PbO
2The matrix of electrode, but its application still is not reported.In addition, be that the preparation research of matrix also has report with iron plate, graphite, epoxy plastics etc.But these technology all are to be basic skills with electrochemical plating, what material to be matrix with no matter, all the etching problem that causes of the coating slit that can not fundamentally avoid electroplating process to cause.
PbO
2Electrode is also less at the application report in environmental protection field, but there are some researches prove PbO
2Under the anode condition, can produce ozone, and have very high electrochemical activity, can be considered as the electrode materials that electrolytic process is handled organic waste water.But the research of this respect only limits to the PbO of electrochemical plating preparation
2Electrode, the PbO of additive method preparation
2Whether electrode also has higher electrochemical activity is not seen in report as yet.
Summary of the invention
The object of the invention is to propose that a kind of erosion resistance is good, electrochemical activity is high, the simple novel no matrix PbO of preparation technology
2Electrode and preparation method thereof fundamentally solves coating PbO
2The problem that comes off of electrode, and be applied to wastewater treatment.
The no matrix PbO that the present invention proposes
2Electrode is made through compressing tablet by lead dioxide powder and tetrafluoroethylene or polypropylene microparticle.Wherein, the mass ratio of component is: 1/2≤plumbic oxide: tetrafluoroethylene or polypropylene≤7, the median size of tetrafluoroethylene or polypropylene microparticle is less than 100 microns.
Electrode preparation method of the present invention is as follows: with lead dioxide powder and tetrafluoroethylene or polypropylene microparticle, by above-mentioned part by weight uniform mixing, depress to pellet electrode at 10-30MPa pressure; Shaped electrode is adopted method such as the aging or hyperthermia drying processing of preelectrolysis stablize or modification.
In the aforesaid method, the lead dioxide powder source is commercially available or chemical method preparation.Tetrafluoroethylene or polypropylene microparticle median size are less than 100 microns.
The blending ratio of two kinds of materials (mass ratio) is: 1/2≤PbO
2: tetrafluoroethylene or polypropylene≤7.
The tablet forming technique condition: pressure range is at 10MPa～30MPa.
Stablize or modified condition: preelectrolysis in target electrolytic solution, the time generally can be 10-24 hour, and the temperature that hyperthermia drying is handled is 100-300 ℃, and the time was generally 2-5 hour, to improve electrode stability.Further pyroprocessing electrode under 300～500 ℃ of conditions also changing the form of tetrafluoroethylene, thereby changes the microtexture of electrode.
PbO with the present invention's preparation
2Electrode is used for the electrolysis treatment organic dye waste water as anode, all has a clear superiority in than common graphite anode on percent of decolourization and COD clearance.
PbO by the present invention's preparation
2Electrode belongs to no matrix preparation method, has fundamentally avoided problems such as coating comes off.Play adhesive effect by adding the high ptfe micropowder of stability, both solved traditional no matrix PbO
2The shortcoming of electrode bad mechanical strength can not influence the work of whole electrolysis system again because of introducing impurity.And preparation process is very simple, helps industrial applications.Electrode erosion resistance with this method preparation is good, and the electrochemistry height is handled organic waste water as anode electrolysis and can be reached tangible degradation effect.
Embodiment
The invention is further illustrated by the following examples.
Embodiment 1, the FR002A type ptfe micropowder (median size is 5 microns) that the lead dioxide powder of chemical precipitation method preparation and the Shanghai rich novel material of three love company limited are provided depresses to 100mm * 30mm rectangular sheet with 7: 1 uniform mixing of mass ratio at 20MPa pressure.With this sheet in baking under the 250-300 degrees celsius after 2 hours, as using electrode.This electrode surface is smooth, firmly compact, and resistance is 50～100 Ω.At voltage 100V, current density 1000A/m
2Work under the condition, annual corrosion rate is less than 0.05%.When being applied to the neutral purplish red electrolysis of solutions of dyestuff and handling, electrolysis is 1.5 hours under applied power 18W condition, and percent of decolourization is about 75%, is about 1.7 times of common graphite electrode under the similarity condition; The COD clearance is about 30%, is about 2 times of common graphite electrode under the similarity condition.
Embodiment 2, and commercially available lead dioxide powder and technical grade ptfe micropowder (median size is less than 20 microns) with 0.5: 1 uniform mixing of mass ratio, are depressed to 100mm * 30mm rectangular sheet at 10MPa pressure.With this sheet in the purplish red solution of target processing solution neutral after preelectrolysis 10-24 hour, as using electrode.This electrode surface is smooth, and physical strength height, resistance are 2～3k Ω.At voltage 100V, current density 1000A/m
2Work under the condition, annual corrosion rate is less than 0.05%.The neutral purplish red solution of electrolysis is 1.5 hours under applied power 18W condition, and percent of decolourization is about 70%, is about 1.6 times of common graphite electrode under the similarity condition; The COD clearance is about 30%, is about 2 times of common graphite electrode under the similarity condition.
Embodiment 3, and the lead dioxide powder of chemical precipitation method preparation and technical grade ptfe micropowder (median size is less than 100 microns) with 2.5: 1 uniform mixing of mass ratio, are depressed to 100mm * 30mm rectangular sheet at 30MPa pressure.With this sheet in baking under 100 degrees celsius after 3-5 hour, as using electrode.This electrode surface is smooth, and physical strength height, resistance are 200～500 Ω.At voltage 100V, current density 1000A/m
2Work under the condition, annual corrosion rate is less than 0.05%.When being applied to dyestuff alizarin red aqueous solution electrolysis treatment, electrolysis is 1.5 hours under applied power 18W condition, and percent of decolourization is about 60%, is about 2 times of common graphite electrode under the similarity condition; The COD clearance is about 15%, is about 1.5 times of common graphite electrode under the similarity condition.
Claims (4)
1, a kind of lead dioxide electrode is characterized in that being made through compressing tablet by lead dioxide powder and tetrafluoroethylene particulate; Wherein, the mass ratio of component is: 1/2≤plumbic oxide: tetrafluoroethylene≤7, the median size of tetrafluoroethylene particulate is less than 100 microns.
2, a kind of preparation method of lead dioxide electrode as claimed in claim 1 is characterized in that lead dioxide powder and tetrafluoroethylene particulate, by described mass ratio uniform mixing, depresses to pellet electrode at 10-30MPa pressure; Adopt the aging or hyperthermia drying treatment process of preelectrolysis to stablize or modification to shaped electrode.
3, preparation method according to claim 2 is characterized in that said preelectrolysis digestion time is 10-24 hour, and the temperature of hyperthermia drying is 100-300 ℃, and the time is 2-5 hour.
4, preparation method according to claim 3 is characterized in that further pyroprocessing under 300-500 ℃ of condition of counter electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100845678A CN1320171C (en) | 2004-11-25 | 2004-11-25 | Lead dioxide electrode and preparing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100845678A CN1320171C (en) | 2004-11-25 | 2004-11-25 | Lead dioxide electrode and preparing method thereof |
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| Publication Number | Publication Date |
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| CN1635183A CN1635183A (en) | 2005-07-06 |
| CN1320171C true CN1320171C (en) | 2007-06-06 |
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| CNB2004100845678A Expired - Fee Related CN1320171C (en) | 2004-11-25 | 2004-11-25 | Lead dioxide electrode and preparing method thereof |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1924102B (en) * | 2006-09-05 | 2011-03-23 | 陕西科技大学 | Preparation method of lead dioxide porous electrode |
| CN101634037B (en) * | 2009-08-21 | 2012-09-05 | 昆明理工大学 | Polyaniline anode for electrochemical electrolysis and preparation method thereof |
| CN102888126A (en) * | 2011-07-20 | 2013-01-23 | 比亚迪股份有限公司 | Thermal resistor composite material and preparation method thereof and thermal resistor containing thermal resistor composite material |
| CN104131318B (en) * | 2014-08-01 | 2016-12-07 | 昆明理工大学 | A kind of CNT and/or Graphene strengthen lead base composite anode preparation method |
| CN106277216A (en) * | 2016-08-05 | 2017-01-04 | 浙江工业大学 | indium-doped titanium-based lead dioxide electrode and preparation method and application thereof |
| CN109802099B (en) * | 2018-12-29 | 2022-11-29 | 河南诺兰特新材科技有限公司 | Method for manufacturing lead electrode fused with silicon nitride and lead-acid storage battery thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3909369A (en) * | 1974-05-23 | 1975-09-30 | Council Scient Ind Res | Method for the production of an electrode for cathodic protection |
| CN1033657A (en) * | 1987-10-27 | 1989-07-05 | 福州大学化学工程系 | The modified anode of lead dioxide that electrolytic industry is used |
-
2004
- 2004-11-25 CN CNB2004100845678A patent/CN1320171C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3909369A (en) * | 1974-05-23 | 1975-09-30 | Council Scient Ind Res | Method for the production of an electrode for cathodic protection |
| CN1033657A (en) * | 1987-10-27 | 1989-07-05 | 福州大学化学工程系 | The modified anode of lead dioxide that electrolytic industry is used |
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| CN1635183A (en) | 2005-07-06 |
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