CN103159300B - Method for removing pentavalent antimony pollutant in water through electrochemical method - Google Patents
Method for removing pentavalent antimony pollutant in water through electrochemical method Download PDFInfo
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- CN103159300B CN103159300B CN201310059368.0A CN201310059368A CN103159300B CN 103159300 B CN103159300 B CN 103159300B CN 201310059368 A CN201310059368 A CN 201310059368A CN 103159300 B CN103159300 B CN 103159300B
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Abstract
The invention discloses a method for removing pentavalent antimony pollutant in water through an electrochemical method, and belongs to the technical field of water treatment. The method comprises the following steps: in an electrochemical reactor, serving an iron electrode as a positive electrode and serving a copper plate or a nickel plate as a negative electrode; adjusting a potential of hydrogen (pH) value of the to-be-processed water containing the pentavalent antimony pollutant to be 3-7, introducing the to-be-processed water into the electrochemical reactor, and adjusting the current density to be 10-30 amperes per square meter, the area of electrode plates and the size of the to-be-processed water to be 0.5-1 square meters/ cubic meters, a space distance of the electrode plates to be 1-8cm, and electrochemical treatment time to be 10-40 minutes; and adopting a direct current power supply to supply power. The electrochemical method not only can effectively remove pentavalent antimony pollutant, but also can remove trivalent antimony pollutant.
Description
Technical field
The invention belongs to water-treatment technology field, be specifically related to a kind of electrochemical method removing quinquevalence antimony pollutent in water.
Background technology
In recent years, the heavy metal pollution problem caused due to industrial wastewater discharge becomes increasingly conspicuous, and effectively the heavy metal ion removed in water is the study hotspot of water-treatment technology field always.Heavy metal antimony has toxicity and carinogenicity to human body and biology, and can cause the disease of liver, skin, respiratory system and cardiovascular systems aspect, stibialism has the advantages that to hide for a long time.In antimony pollution thing, the existence form of antimony has trivalent and pentavalent two kinds of valence states, and in water, trivalent antimony is easy to remove, but antimonic electronegativity is comparatively large, and in water, solubleness is higher, is difficult to remove.Antimony in surface water mainly exists with pentavalent form, and trivalent antimony relative concentration is lower.
The method removing antimony pollution thing in water mainly comprises absorption method, coagulant sedimentation, oxidation reduction process and ion exchange method etc.
Absorption method has that efficiency is high, speed is fast, strong adaptability and the advantage such as easy to operate, but due to zwitterion interference in water, the antimony pollution thing removal efficiency of absorption method to lower concentration is lower; Coagulant sedimentation is mainly through regulating the potential of hydrogen of water, and make antimony pollution thing self that hydrolytic precipitation occur, or by adding the co-precipitation of chemical agent coagulation, antimony pollution thing is removed, it is large that coagulant sedimentation exists dosage, the problems such as quinquevalence antimony clearance is low; The antimony pollution in the acid beneficiation wastewater of light electrolysis-moderate water-cut stage process is adopted to have been reported, acid waste water is allowed to pass through to be full of the cylindrical reactor of coke and iron filings, then water outlet adds alkali neutralization, antimony pollution thing in water is removed, this method is difficult to remove quinquevalence antimony pollutent, limited to the antimony pollution thing removal ability of lower concentration in water; In addition, have report to adopt the sequestering ion exchange resin of aminoalkyl group phosphate as absorption exchanger, remove the antimony pollution thing in water, result shows, this method is better to trivalent antimony removal effect, but limited to quinquevalence antimony removal ability.
Electrochemical method is a kind of effective water purification technology, is by there is electrochemical reaction in water, and through processes such as flocculation, precipitation, oxidation and reduction, single or compound action, makes pollutent be purified process.Chinese patent 200520031775 discloses a kind of anode by the concentric(al) circles tubular of multiple different inner diameters, cathode sheath superpose form electrode group, device that electrochemical treatment that electrolytic solution, cylindrical chamber are formed is purified waste water.It removing hardness in water medium suspended substance, catalytic oxidation waste water COD, softening water medium by air supporting choosing can be reached during direct current, remove most metal ion in water, effect that bacterium algae in water medium is killed in electrolysis.Existing bibliographical information adopts aluminium sheet to be electrode, removes antimony pollution thing by electric throwing out, and it is better that this method removes trivalent antimony pollutant effect, lower to antimonic clearance.
Summary of the invention
The object of the present invention is to provide a kind of method utilizing electrochemical method to remove quinquevalence antimony pollutent in water, first utilize electro-reduction method that quinquevalence antimony in water is reduced to trivalent antimony, recycling anode dissolution method produces ferrous and iron ion, removes trivalent antimony pollutant further by flocculation and co-precipitation.The ferrous ion produced effectively reduces the oxidizing potential in electrochemical system, creates reductive condition, facilitates the antimonic electroreduction of negative electrode.Ferrous iron in acid condition also can partial reduction quinquevalence antimony simultaneously.In this electrochemical system, effectively eliminated the antimony pollution thing in water by processes such as reduction, flocculation, absorption and precipitations.For achieving the above object, the present invention adopts following technical scheme:
Be difficult to remove for quinquevalence antimony pollutent in water, and the feature that trivalent antimony is easily removed, in electrochemical reactor, arrange ferroelectric very anode, copper coin or nickel plate are negative electrode.Be adjusted between 3-7 by the pH value of the pending water containing quinquevalence antimony pollutent, pass in electrochemical reactor, adjustment current density is 10-30A/m
2, polar plate area and staying water amass as 1/2-1m
2/ m
3, polar plate spacing is 1-8 centimetre, the electrochemical treatment time is 10-40 minute.Direct supply is adopted to power.
Preferably, the pH value of the pending water containing quinquevalence antimony pollutent is adjusted to 3-6;
Preferred further, the pH value of the pending water containing quinquevalence antimony pollutent is adjusted to 3,3.5,4,5 or 5.6;
Preferred adjustment current density is 10-20A/m
2;
Preferred adjustment current density is 10,15 or 20A/m
2;
Preferably, polar plate spacing is 1-3 centimetre;
The efficient removal to quinquevalence antimony pollutent in water is realized by said process.After electrochemical treatment, in water, the content of antimony pollution thing is lower than the antimony limiting concentration value 5 μ g/L specified in China " drinking water sanitary standard " (GB5749-2006).
In electrochemical reactor, by the electroreduction effect of cathode plate or nickel plate by quinquevalence antimony (Sb
5+) be reduced to trivalent antimony (Sb
3+):
Sb
5++2e
-→Sb
3+
There is electrochemical dissolution reaction in anode iron (Fe), produce ferrous ion and iron ion under anode potential effect, and hydrolysis forms iron flco or ferriferous oxide further.Trivalent antimony pollutant is by being purified removal with the co-precipitation or throwing out of molysite, and its reaction is as follows:
Fe→Fe
2++2e
-
Under alkaline or neutral conditions: Fe
2++ 2OH
-→ Fe (OH)
2
In acid condition: 4Fe
2++ O
2+ 2H
2o → 4Fe
3++ 4OH
-.
Sb
5++2Fe
2+→Sb
3++2Fe
3+
Sb
3++Fe
3++3OH
-→Sb
3+Fe(OH)
3
Beneficial effect:
(1) by coupling iron plate electrode (anode) and copper coin or nickel plate reductibility electrode (negative electrode), quinquevalence antimony is realized to be reduced to trivalent antimony, produce iron ion by anode dissolution method to realize acting synergistically with antimonious coagulation and co-precipitation, make quinquevalence antimony pollutent in water effectively be purified removal.
(2) ferrous ion of chemical original position generation, in acid condition, has strong reductibility.Not only can reduce the oxidizing potential in electro-chemical systems, also can realize antimonic reduction.
(3) electrochemical method of the present invention not only effectively can remove quinquevalence antimony, can also remove trivalent antimony pollutant.
Specific embodiment
Embodiment 1
In electrochemical reactor, iron plate is anode, and copper coin is negative electrode, and the interpole gap of iron plate electrode and copper coin negative electrode is 1 centimetre, and polar plate area and staying water are long-pending than being 1/2 (m
2/ m
3).Adopt direct supply to power, current density is 15A/m
2.Preparation is containing Sb
3+and Sb
5+pending water, wherein Sb
5+and Sb
3+concentration is respectively 60 μ g/L and 20 μ g/L, regulates the pH value to 3.5 of water.Pump in electrochemical reactor by pending water, the electrochemical reaction treatment time is 30 minutes.Under aforesaid operations condition, the Sb of water after process
5+and Sb
3+removal result is as shown in table 1.Can find out, in effluent quality, antimony content is lower than China's " drinking water sanitary standard " GB5749-2006) the middle antimony limiting concentration 5 μ g/L specified.
Table 1: the electrochemical treatment result of embodiment 1
| Testing index | Before process | After process |
| Sb 5+(μg/L) | 60 | 2.3 |
| Sb 3+(μg/L) | 20 | 1.2 |
Embodiment 2
In electrochemical reactor, iron plate is anode, and nickel plate is negative electrode, and the polar plate spacing of iron plate electrode and reducing electrode is 1.5 centimetres, and polar plate area and staying water are long-pending than being 2/3 (m
2/ m
3).Adopt direct supply to power, current density is 20A/m
2.Sb in pending water
3+and Sb
5+concentration is respectively 35 μ g/L and 12 μ g/L, regulates the pH value to 5.6 of water.Pending water is pumped into electrochemical reactor, and the electrochemical treatment time is 20 minutes.Under aforesaid operations condition, Sb in water after process
5+and Sb
3+removal result is as shown in table 2.Can find out, in effluent quality, antimony content is lower than China's " drinking water sanitary standard " GB5749-2006) the middle antimony limiting concentration 5 μ g/L specified.
Table 2: the electrochemical treatment result of embodiment 2
| Testing index | Before process | After process |
| Sb 5+(μg/L) | 35 | 2.0 |
| Sb 3+(μg/L) | 12 | 0.5 |
Claims (7)
1. utilize electrochemical method to remove a method for quinquevalence antimony pollutent in water, comprise the steps:
In electrochemical reactor, arrange ferroelectric very anode, copper coin or nickel plate are negative electrode; The pH value of the pending water containing quinquevalence antimony pollutent is adjusted to 3-7 and passes in electrochemical reactor, adjustment current density is 10-30A/m
2, polar plate area and staying water amass as 1/2-1m
2/ m
3, polar plate spacing is 1-8 centimetre, the electrochemical treatment time is 10-40 minute; Adopt DC power supply.
2. the method utilizing electrochemical method to remove quinquevalence antimony pollutent in water according to claim 1, is characterized in that the pH value of the described pending water containing quinquevalence antimony pollutent is adjusted to 3-6.
3. the method utilizing electrochemical method to remove quinquevalence antimony pollutent in water according to claim 1 and 2, is characterized in that the pH value of the described pending water containing quinquevalence antimony pollutent is adjusted to 3,3.5,4,5 or 5.6.
4. the method utilizing electrochemical method to remove quinquevalence antimony pollutent in water according to claim 3, is characterized in that described current density is 10-20A/m
2.
5. the method utilizing electrochemical method to remove quinquevalence antimony pollutent in water according to claim 4, is characterized in that described current density is 10,15 or 20A/m
2.
6. the method utilizing electrochemical method to remove quinquevalence antimony pollutent in water according to claim 1, is characterized in that described polar plate spacing is 1-3 centimetre.
7. the method utilizing electrochemical method to remove quinquevalence antimony pollutent in water according to claim 1 is in the application of removing antimony pollution thing in water.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103408108B (en) * | 2013-07-26 | 2014-09-10 | 中国科学院生态环境研究中心 | Method for quickly removing pentavalent antimony pollutant in water by combining sodium sulfite and electrochemistry |
| CN104724797B (en) * | 2014-12-16 | 2017-12-08 | 中国科学院生态环境研究中心 | A kind of manganese ion strengthens the method that electrochemistry removes quinquevalence antimony pollutant in water removal |
| CN106396001A (en) * | 2016-10-26 | 2017-02-15 | 中国电建集团华东勘测设计研究院有限公司 | Method for removing pentavalent antimony contaminants from water and fuel cell |
| CN108193478B (en) * | 2018-01-23 | 2020-04-21 | 绵阳市聚合新材料有限公司 | Method for cleaning catalyst of polyester fiber material |
| CN108560021B (en) * | 2018-04-13 | 2019-09-27 | 中国科学院生态环境研究中心 | A kind of method that photoelectric coupling recycles simple substance antimony from quinquevalence antimony waste water |
| CN109304365B (en) * | 2018-12-03 | 2021-09-28 | 南京迪天高新产业技术研究院有限公司 | Electric remediation method for antimony-polluted soil |
| CN110182912A (en) * | 2019-07-08 | 2019-08-30 | 南昌航空大学 | A kind of electrochemical method removing trivalent Sb |
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| CN101168456A (en) * | 2007-09-29 | 2008-04-30 | 华中科技大学 | Reduction treatment method for waste water |
| CN101781042A (en) * | 2010-01-29 | 2010-07-21 | 中国科学院地球化学研究所 | Method for treating antimony-containing industrial waste water through iron electrode-electroflocculation process |
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|---|---|---|---|---|
| JP4006502B2 (en) * | 1998-10-16 | 2007-11-14 | Ｄｏｗａエコシステム株式会社 | How to remove antimony from wastewater |
| CN101186376B (en) * | 2007-12-18 | 2011-03-16 | 苏州大学 | Method for removing semimetal antimony ion from waste water |
| CN102553520A (en) * | 2010-12-08 | 2012-07-11 | 中国科学院生态环境研究中心 | Method for preparing, using and regenerating Fe-Mn-Al composite oxide/zeolite antimony removal adsorbent |
| CN102923829A (en) * | 2012-11-20 | 2013-02-13 | 河海大学 | Novel multi-layer electrochemical wastewater treatment device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168456A (en) * | 2007-09-29 | 2008-04-30 | 华中科技大学 | Reduction treatment method for waste water |
| CN101781042A (en) * | 2010-01-29 | 2010-07-21 | 中国科学院地球化学研究所 | Method for treating antimony-containing industrial waste water through iron electrode-electroflocculation process |
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