CN108147503A - Manganese oxide electrode, preparation method and the usage - Google Patents
Manganese oxide electrode, preparation method and the usage Download PDFInfo
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- CN108147503A CN108147503A CN201711470527.0A CN201711470527A CN108147503A CN 108147503 A CN108147503 A CN 108147503A CN 201711470527 A CN201711470527 A CN 201711470527A CN 108147503 A CN108147503 A CN 108147503A
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- titanium net
- manganese oxide
- oxide electrode
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- ammonia nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
- C02F2001/46138—Electrodes comprising a substrate and a coating
- C02F2001/46142—Catalytic coating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Catalysts (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a kind of manganese oxide electrode, preparation method and applications.The preparation method includes：By the titanium net Jing Guo pre-treatment in containing Mn2+Maceration extract in impregnate, take out and be dried later, until titanium net without apparent liquid, is heat-treated thereafter by titanium net surface, the manganese oxide electrode is made.Using manganese oxide electrode provided by the invention as anode material carry out electro-catalysis denitrogenation, can under the driving of direct current directly by ammonium oxidation into nitrogen, realize thorough denitrogenation, whole process mild condition, secondary pollution is not generated, degradation efficiency is high, and operating cost is low, easily controllable.
Description
Technical field
The present invention relates to a kind of electrode materials, and in particular to a kind of manganese oxide electrode, preparation method and the usage, such as profit
With the method for its electro-catalysis denitrogenation.
Background technology
Excess of ammonia nitrogen can reduce the concentration of dissolved oxygen in water body, generate nitrate anion and nitrite anions, lead to eutrophication,
Algal bloom can be broken out when serious, harmful effect is generated to aquatile, industrial production and people’s lives.According to oil
Chemical industry sewage drainage standard (GB31571-2015), ammonia nitrogen (NH3-N) content are no more than 8mg/L.
The method of denitrogenation at present has bioanalysis and physical-chemical process.Physical-chemical process mainly has break point chlorination, chemistry to sink
Shallow lake method, physics blow-off method, air- extraction etc., otherwise these method operating costs are high or treatment effeciency is low or generates secondary dirt
Dye, wherein bioanalysis requires temperature, pH value etc. harsh, and break point chlorination generates harmful derivative such as chlorine residue and chloramines.Therefore,
Need the denitrogenation new technology of high efficiency, low cost and non-secondary pollution.
CN107235537A discloses a kind of with magnesium or the electrochemical method of magnesium alloy denitrogenation, this method is by generation hydrogen-oxygen
Change magnesium, indirectly so that ammonia nitrogen settles down, there is no release mineralized nitrogen for nitrogen.CN106630116A、
CN106563504A, CN103613206B, CN102942293A, CN102351312A report electrochemical cathode also orthonitric acid
The method of root denitrogenation, but this method and non-oxide ammonia nitrogen denitrogenation.The tin oxide graphite electrode that CN103241809A is adulterated with neodymium,
Exceeding realizes the degradation of ammonia nitrogen under potential condition, but high potential means that electro catalytic activity is limited.Therefore, this field is urgently
High electrocatalytic active to be developed, efficient electrode material.
Invention content
It is existing so as to overcome it is a primary object of the present invention to provide a kind of manganese oxide electrode, preparation method and the usage
Deficiency in technology.
To realize aforementioned invention purpose, the technical solution adopted by the present invention includes：
An embodiment of the present invention provides a kind of preparation method of manganese oxide electrode, including：By the titanium net Jing Guo pre-treatment
In containing Mn2+Maceration extract in impregnate, take out and be dried later, until titanium net surface without apparent liquid, thereafter will
Titanium net keeps the temperature 1~5h in 350~550 DEG C, and the manganese oxide electrode is made.
Further, the preparation method includes the following steps：
(1) pre-treatment is carried out to titanium net；
(2) by the titanium net Jing Guo pre-treatment in containing Mn2+Maceration extract in impregnate；
(3) titanium net from maceration extract is taken out and room temperature is dried, dry 1~2h at 80~135 DEG C later；
(4) operation for repeating step (3) more than twice, then by titanium net keeps the temperature 1~5 hour at 350~550 DEG C, later
It is cooled to room temperature, obtains the manganese oxide electrode.
Further, the purity of the titanium net>99.9wt%.
Further, the pre-treatment includes：By titanium net successively with NaOH solution, oxalic acid solution processing, be placed on
1~2min of ultrasound, is further taken out and is dried up with nitrogen in deionized water.
Further, the Mn in the maceration extract2+From soluble manganese salt.Wherein, the manganese salt includes manganese nitrate, but
It is not limited to this.
Further, the solvent in the maceration extract includes ethyl alcohol.
The embodiment of the present invention is additionally provided by the manganese oxide electrode of aforementioned any method preparation.
The embodiment of the present invention additionally provides aforementioned manganese oxide electrode in the application in electro-catalysis denitrogenation field.
The embodiment of the present invention additionally provides a kind of electro-catalysis denitrogenation method, including：
Using the aforementioned oxidation manganese electrode as anode and the merging of the pure titanium net as cathode in the aqueous phase system containing ammonia nitrogen,
And it is arranged at intervals cathode and anode；
The pH value of the aqueous phase system containing ammonia nitrogen is adjusted to 9~11, and adds in electrolyte and is uniformly mixed；
Apply the constant voltage of 1~3.5V between a cathode and an anode, so as to remove the ammonia nitrogen in the aqueous phase system.
Further, include sodium carbonate-bicarbonate for adjusting the reagent of the pH value of the aqueous phase system containing ammonia nitrogen
Sodium buffer solution.Further, the electrolyte includes sodium sulphate or potassium sulfate, but not limited to this.
Further, during electro-catalysis denitrogenation is carried out, the temperature of the aqueous phase system can be 25 DEG C or so.
In the more specific case study on implementation of the present invention, a kind of preparation method of manganese oxide electrode can include：
(1) by titanium net (purity>99.9%, size is that length × width x thickness is 30mm × 30mm × 1mm, and diamond hole size is
2mm × 4mm, naturally it is also possible to which use is larger sized or is cut to smaller szie) successively oil removal treatment is carried out with NaOH solution
Processing, deionized water 1~2min of ultrasound are performed etching with oxalic acid solution, nitrogen drying is stored in spare in absolute ethyl alcohol；
(2) maceration extract is prepared：Weigh the manganese nitrate (Mn (NO that mass fraction is 50% or other suitable concentration3)2) solution,
Make solvent with absolute ethyl alcohol, prepare the Mn (NO of 0.5mol/L3)2Solution stirs evenly；
(3) will through step (1), treated that titanium net is impregnated in certain time in the maceration extract of (2), room temperature is gone to after drying
1~2h is dried at 80~135 DEG C in baking oven, until titanium net surface is without apparent liquid；
(4) after step (3) is repeated 2 times, obtained electrode material is transferred in Muffle furnace and is heat-treated, 350~
It 550 DEG C of 1~5 hours of heat preservation, is taken out after being cooled to room temperature, that is, obtains the manganese oxide electrode.
And correspondingly, a kind of method for carrying out electro-catalysis denitrogenation using the manganese oxide electrode can include：
Using the manganese oxide electrode as anode, the titanium net that is used in abovementioned steps (1) is cathode, is kept between a fixed electrode
Away from being inserted into the aqueous phase system containing ammonia nitrogen (such as simulated wastewater solution containing ammonia nitrogen), delayed with sodium carbonate and sodium bicarbonate
Fliud flushing regulation system pH value is 9~11, adds a certain amount of sodium sulphate or potassium sulfate makees electrolyte, at the uniform velocity agitating solution, is controlled
The output voltage values of constant voltage processed realize the target of denitrogenation for 1~3.5V.
Manganese oxide electrode provided by the invention is when applied to electro-catalysis denitrogenation, because in its manganese oxide, manganese valence
Change can be carried out between positive trivalent and positive tetravalence, so as to realize electrocatalytic oxidation.
Compared with prior art, electro-catalysis denitrogenation is carried out as anode material using manganese oxide electrode provided by the invention,
Can under the driving of direct current directly by ammonium oxidation into nitrogen, realize thorough denitrogenation, whole process mild condition does not generate
Secondary pollution, degradation efficiency is high, and operating cost is low, easily controllable.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments described in invention, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of TEM photos of manganese oxide electrode in the embodiment of the present invention 1.
Specific embodiment
Technical scheme of the present invention will be clearly and completely described below, it is clear that described embodiment is this hair
Bright part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
All other embodiments obtained under the premise of creative work are made, shall fall within the protection scope of the present invention.
Embodiment 1
(1) by titanium net (purity>99.9%, size is that length × width x thickness is 30mm × 30mm × 1mm, and diamond hole size is
2mm × 4mm) NaOH and oxalic acid treatment, deionized water ultrasound 1-2 minutes are used successively, nitrogen drying is stored in standby in absolute ethyl alcohol
With；
(2) maceration extract is prepared：Weigh the manganese nitrate (Mn (NO that mass fraction is 50%3)2) solution, made with absolute ethyl alcohol molten
Mn (the NO of 0.5mol/L are prepared in agent3)2Solution stirs evenly；
(3) titanium net handled in (1) is impregnated in the maceration extract of (2) 1 minute, room temperature gone to after drying in baking oven
105 DEG C of baking 2h, until titanium net surface is without apparent liquid；
(4) after step (3) is repeated twice, electrode is transferred in Muffle furnace, 2 hours are kept the temperature at 450 DEG C, it is to be cooled
It is prepared manganese oxide electro catalytic electrode that electrode is taken out after to room temperature.
(5) using above-mentioned electrode as anode, electrode is cathode in step (1), and thermostatic control is 25 DEG C, and constant voltage control is U
=2.0V, holding electrode spacing are 2cm, and the simulation ammonia nitrogen using the mass concentration that ammonium sulfate is nitrogen source preparation nitrogen as 100mg/L gives up
Liquid is 9.5 with sodium carbonate and sodium bicarbonate buffer liquid regulation system pH value, and addition 0.1mol/L sodium sulphate makees electrolyte, to go
Ion water as solvent, at the uniform velocity total volume 60ml, agitating solution.1ml solution was taken every two hours, is diluted to 50ml, adds in 1ml
Potassium sodium tartrate solution and 1ml nessler reagents are uniformly mixed, and after ten minutes, are surveyed using T1901 ultraviolet-uisible spectrophotometers
Absorbance at 380nm, and calculate with this degradation rate of ammonia nitrogen.Ammonia nitrogen degradation rate a=(C0-Ci)/C0× 100=(A0-Ai)/
A0C in × 100 formulas0For the initial concentration of ammonia nitrogen, CiFor the concentration of remaining ammonia nitrogen, A0For the absorbance of initial soln, AiFor residue
The absorbance of ammonia nitrogen.By 10h electro-catalysis, ammonia nitrogen degradation rate is up to 77.1%.
Embodiment 2
(1) it is same as Example 1；
(2) it is same as Example 1；
(3) titanium net handled in (1) is impregnated in the maceration extract of (2) 3 minutes, room temperature is gone in baking oven after drying 80
DEG C dry 2h, until titanium net surface is without apparent liquid；
(4) after step (3) is repeated twice, electrode is transferred in Muffle furnace, 1h is kept the temperature at 550 DEG C, is cooled to room
Electrode, as prepared manganese oxide electro catalytic electrode are taken out after temperature.
(5) it is substantially the same manner as Example 1, but the pH value of system is adjusted to 11, and constant voltage control is U=3.5V.By
10h electro-catalysis, ammonia nitrogen degradation rate is up to 78%.
Embodiment 3
(1) it is same as Example 1；
(2) it is same as Example 1；
(3) titanium net handled in (1) is impregnated in the maceration extract of (2) 2 minutes, room temperature gone to after drying in baking oven
1h is dried at 135 DEG C, until titanium net surface is without apparent liquid；
(4) after step (3) is repeated twice, electrode is transferred in Muffle furnace, 5 hours is kept the temperature at 350 DEG C, treats cold
But to taking out electrode, as prepared manganese oxide electro catalytic electrode after room temperature.
(5) it is same as Example 1, but the pH value of system is adjusted to 9, and constant voltage control is U=1V.It is urged by 10h electricity
Change, ammonia nitrogen degradation rate is up to 75%.
It should be noted that each technical characteristic of embodiment described above can be combined arbitrarily, to make description simple
Clean, combination not all possible to each technical characteristic in above-described embodiment is all described, as long as however, these technologies are special
Contradiction is not present in the combination of sign, is all considered to be the range of this specification record.
Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that those of ordinary skill in the art are come
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of preparation method of manganese oxide electrode, it is characterised in that including：By the titanium net Jing Guo pre-treatment in containing Mn2+Leaching
It is impregnated in stain liquid, takes out and be dried later, until titanium net surface is without apparent liquid, thereafter by titanium net in 350~550
DEG C heat preservation 1~5h, be made the manganese oxide electrode.
2. preparation method according to claim 1, it is characterised in that include the following steps：
(1) pre-treatment is carried out to titanium net；
(2) by the titanium net Jing Guo pre-treatment in containing Mn2+Maceration extract in impregnate；
(3) titanium net from maceration extract is taken out and room temperature is dried, dry 1~2h at 80~135 DEG C later；
(4) repeat step (3) operation more than twice, then by titanium net 350~550 DEG C keep the temperature 1~5 hour, postcooling
To room temperature, the manganese oxide electrode is obtained.
3. preparation method according to claim 1 or 2, it is characterised in that：The purity of the titanium net>99.9wt%.
4. preparation method according to claim 1 or 2, which is characterized in that the pre-treatment includes：Titanium net is used successively
NaOH solution, oxalic acid solution processing, be placed on 1~2min of ultrasound in deionized water, further take out and dried up with nitrogen.
5. preparation method according to claim 1 or 2, it is characterised in that：Mn in the maceration extract2+From solubility
Manganese salt, the manganese salt include manganese nitrate.
6. preparation method according to claim 1 or 2, it is characterised in that：Solvent in the maceration extract includes ethyl alcohol.
7. the manganese oxide electrode prepared by any one of claim 1-6 the methods.
8. the manganese oxide electrode described in claim 7 is in the application in electro-catalysis denitrogenation field.
9. a kind of electro-catalysis denitrogenation method, it is characterised in that including：
The water containing ammonia nitrogen using the manganese oxide electrode as claimed in claim 7 as anode and the merging of the pure titanium net as cathode
In phase system, and it is arranged at intervals cathode and anode；
The pH value of the aqueous phase system containing ammonia nitrogen is adjusted to 9~11, and adds in electrolyte and is uniformly mixed；
Apply the constant voltage of 1~3.5V between a cathode and an anode, so as to remove the ammonia nitrogen in the aqueous phase system.
10. electro-catalysis denitrogenation method according to claim 9, it is characterised in that：For adjusting the water containing ammonia nitrogen
The reagent of the pH value of phase system includes sodium carbonate-bicarbonate buffer solution；And/or the electrolyte includes sodium sulphate or sulphur
Sour potassium.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711470527.0A CN108147503A (en) | 2017-12-29 | 2017-12-29 | Manganese oxide electrode, preparation method and the usage |
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| CN201711470527.0A CN108147503A (en) | 2017-12-29 | 2017-12-29 | Manganese oxide electrode, preparation method and the usage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109179590A (en) * | 2018-09-20 | 2019-01-11 | 大连海事大学 | A kind of titanium-based carbon dope manganese oxide electrode and its preparation method and application for treatment of dyeing wastewater |
| CN112978867A (en) * | 2021-02-24 | 2021-06-18 | 重庆建深环境科技有限公司 | Method for electrolyzing ammonia nitrogen wastewater by using manganese-containing catalyst |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100553364B1 (en) * | 2004-03-09 | 2006-02-20 | (주)에이엠티기술 | Metal Mixed Oxide Electrode And Making method of The Same |
| US20110180423A1 (en) * | 2008-02-11 | 2011-07-28 | Wisconsin Alumni Research Foundation | Methods for removing contaminants from aqueous solutions using photoelectrocatalytic oxidization |
| CN105084467A (en) * | 2014-05-05 | 2015-11-25 | 潘映昆 | Processing reactor of printing and dyeing waste water with catalytic electrode |
-
2017
- 2017-12-29 CN CN201711470527.0A patent/CN108147503A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100553364B1 (en) * | 2004-03-09 | 2006-02-20 | (주)에이엠티기술 | Metal Mixed Oxide Electrode And Making method of The Same |
| US20110180423A1 (en) * | 2008-02-11 | 2011-07-28 | Wisconsin Alumni Research Foundation | Methods for removing contaminants from aqueous solutions using photoelectrocatalytic oxidization |
| CN105084467A (en) * | 2014-05-05 | 2015-11-25 | 潘映昆 | Processing reactor of printing and dyeing waste water with catalytic electrode |
Non-Patent Citations (2)
| Title |
|---|
| 张开诚: "《化学实验教程》", 28 February 2014, 华中科技大学出版社 * |
| 张招贤等: "《涂层钛电极》", 31 May 2014, 冶金工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109179590A (en) * | 2018-09-20 | 2019-01-11 | 大连海事大学 | A kind of titanium-based carbon dope manganese oxide electrode and its preparation method and application for treatment of dyeing wastewater |
| CN109179590B (en) * | 2018-09-20 | 2021-10-08 | 大连海事大学 | Titanium-based carbon-doped manganese oxide electrode for printing and dyeing wastewater treatment |
| CN112978867A (en) * | 2021-02-24 | 2021-06-18 | 重庆建深环境科技有限公司 | Method for electrolyzing ammonia nitrogen wastewater by using manganese-containing catalyst |
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