CN106745556A - A kind of Electro Sorb removes chromium in water removal（Sexavalence）The method of ion - Google Patents
A kind of Electro Sorb removes chromium in water removal（Sexavalence）The method of ion Download PDFInfo
- Publication number
- CN106745556A CN106745556A CN201710030634.5A CN201710030634A CN106745556A CN 106745556 A CN106745556 A CN 106745556A CN 201710030634 A CN201710030634 A CN 201710030634A CN 106745556 A CN106745556 A CN 106745556A
- Authority
- CN
- China
- Prior art keywords
- carbon fiber
- activated carbon
- electro sorb
- ion
- fiber electrodes
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Classifications
-
- 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
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4691—Capacitive deionisation
-
- 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
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Abstract
The present invention relates to a kind of method of water-treatment technology field, the method for specifically removing chromium (sexavalence) ion in water removal as electrode material Electro Sorb by the use of souring activity Carbon fibe.The present invention is achieved by the following technical solutions, specifically includes following steps：(1) the hydrochloric Acid Modification treatment of Activated Carbon Fiber Electrodes；(2) Activated Carbon Fiber Electrodes electric adsorption module is assembled；(3) chromium in water (sexavalence) ion is adsorbed and is desorbed by changing the operating voltage of electric adsorption module, flow of inlet water, water inlet chromium (sexavalence) ion concentration condition.The advantage of the invention is that：Method is simple for Activated Carbon Fiber Electrodes acidifying, to environment non-secondary pollution, easily makes, high to the adsorption efficiency of chromium in water (sexavalence) ion with Activated Carbon Fiber Electrodes, simple to operate, can continuously recycle.
Description
Technical field
The present invention relates to a kind of method of water-treatment technology field, specifically by the use of souring activity Carbon fibe as electrode material
Material Electro Sorb removes Cr in water removal6+The method of ion, the method removal rate is fast, does not produce secondary pollution.
Background technology
The compound of chromium exists in the form of divalence, trivalent and sexavalence, and its toxicity is most strong with Cr VI.Cr VI is to human body
With carcinogenic, mutagenic effect, it is listed in one of 8 kinds of maximum chemical substances of harm, is internationally recognized three kinds
One of carcinogenic metal object, is also one of 129 kinds of generally acknowledged priority pollutants of Environmental Protection Agency.In view of the harmfulness of chromium, the world is each
State has all carried out strict limitation to the discharge form and discharge capacity of chromium.Such as Japanese maximum emission total chrome content is 2.0mg/
L, Canada is 2.5mg/L.To chromium discharge standard for the upper limit of concentration of hexavalent chromium is defined as 0.5mg/L, total chromium contains for China
Amount must not exceed 1.5mg/L.How effectively and rationally strict discharge standard undoubtedly increases intractability, processing waste water containing chrome
It is current study hotspot.Scholar both domestic and external has carried out numerous studies in terms of route for treatment of chromium containing waste water.
Capacitive deionization (capacitive deionization, CDI), also known as Electro Sorb (electrosorption), is
A kind of new type water that water intermediate ion and charged particle, purifying water body intermediate ion and charged particle are adsorbed using powered electrode surface
Treatment technology, its advantage is：Removal process is not related to redox reaction, and energy consumption is low；Electrode after adsorption saturation can be by applying
Plus backward voltage or the mode of short circuit are regenerated, regenerative operation is easy；Go during deionization that other auxiliary materials need not be added
Material, does not produce secondary pollution；Do not have to chemically react in whole removal and regenerative process, electrode life is long.Therefore phase
Than removing chromium handling process in tradition, capacitive deionization technology is preceding in the great application of the application field containing heavy metal containing wastewater treatments such as chromium
Scape.
NACF is that a kind of intensity is big, density is small, corrosion resistant novel metalloid material.Due to NACF tool
There is specific surface area big, porous body product is big and the features such as small resistivity, necessarily applied as electric adsorption electrode material.It is living
Property Carbon fibe there is continuous block structure, can be directly used as electric adsorption electrode, therefore manufacture craft and reduction can be simplified making
Use cost.
The content of the invention
The method that a kind of Electro Sorb of present invention design removes chromium ion in water removal, including step in detail below：
(1) NACF acidification：Salt acid soak is used, substantial amounts of deionized water rinsing is then used, until pH value is
Neutrality, conductivity value is less than 5 μ Scm-1.110 DEG C of drying in baking oven are positioned over, are placed in drier and are obtained souring activity Carbon fiber
Dimension；
(2) Activated Carbon Fiber Electrodes are prepared：Souring activity Carbon fibe in step (1) is cut into block size to be lived
Property Carbon fibe electrode；
(3) Electro Sorb goes water removal during the Activated Carbon Fiber Electrodes assembling that will be obtained in step (2) is arranged on electric adsorption module
Middle heavy metal ion；
(4) Electro Sorb method goes heavy metal ion in water removal：Configuration heavy metal ion solution, measures heavy metal ion solution and exists
In beaker, the Activated Carbon Fiber Electrodes electric adsorption module assembled in step (3) is carried out into Electro Sorb experiment.Electro Sorb experiment profit
Electric adsorption module is entered into the heavy metal ion solution in peristaltic pump pumps beaker, is finally recycled in beaker, while using
The change of electrical conductivity in conductivity meter real-time monitoring solution, when electrical conductivity keeps constant, i.e., Activated Carbon Fiber Electrodes reach suction
Attached balance.
(5) desorption and regeneration of Activated Carbon Fiber Electrodes：When Activated Carbon Fiber Electrodes reach adsorption saturation, electric suction will be applied to
Voltage short circuit or removal in attached module, the electrical conductivity in solution will be gradually restored to initial value, and electrode has obtained desorption and regeneration.
The concentration of the hydrochloric acid described in step (1) is 1molL-1, soak time is 3h, and pH value is close to 6.9.
Activated Carbon Fiber Electrodes size described in step (2) is 5cm × 5cm.
The heavy metal ion that Activated Carbon Fiber Electrodes Electro Sorb described in step (3) is gone in water removal is Cr6+。
Heavy metal ion Cr described in step (4)6+Concentration be 100mg/L, operating voltage is 1.4V, and flow of inlet water is
15ml/min。
The advantage of the invention is that：Method is simple for NACF acidified modified, easily makes and environmental protection is without two
Secondary pollution, has efficiency high by the use of modified Activated Carbon Fiber Electrodes as the electrode of electric adsorption module, simple to operate, material
Easily it is obtained and the recycling performance of material has greatly improved with without modified material tool.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is the modified scanning electron microscope (SEM) photograph (SEM figures) of the NACF prepared in embodiment one；
Fig. 2 is solution C r in embodiment two6+Initial concentration is to Cr6+The influence of clearance；
Fig. 3 be embodiment three in operating voltage to Cr6+The influence of clearance；
Fig. 4 be example IV in flow of inlet water to Cr6+The influence of clearance；
Fig. 5 is the adsorption/desorption regeneration times of Activated Carbon Fiber Electrodes in embodiment five to being adsorbed in the influence of desorption rate.
Specific embodiment
Embodiments of the invention are elaborated below：The present embodiment is carried out under premised on technical solution of the present invention
Implement, give detailed implementation method, but protection scope of the present invention is not limited to following embodiments.
Embodiment one
The pretreatment of NACF：NACF is cut into the size of 5cm × 5cm, 1molL is used-1Hydrochloric acid
Immersion 3h, to remove the ash content on NACF surface, then uses substantial amounts of deionized water rinsing, until pH value is neutrality, electricity
Conductivity value is less than 5 μ Scm-1.110 DEG C of drying in baking oven are positioned over, are placed in drier.
Embodiment two
The acidified modified rear electrode production process of NACF is identical with embodiment one.
Electric adsorption module to Activated Carbon Fiber Electrodes composition carries out the experiment that Electro Sorb removes chromium ion in water removal.Electricity is inhaled
Attached experiment condition is arranged to voltage for 1.0V, and flow of inlet water is 10mL/min, and pole plate spacing is controlled under conditions of 1mm, respectively
Have studied chromium ion initial concentration NACF Electro Sorb removal chromium in 150mg/L, 120mg/L, 100mg/L, 70mg/L
The effect of ion.Experimental result is as shown in Figure 2, it is seen that modified activated fibre electrode pair Cr6+With preferable adsorption effect.
Embodiment three
The acidified modified rear electrode production process of NACF is identical with embodiment one.
It is the chromium ion solution of 150mg/L to choose initial concentration, and electrode spacing is isolated by being clipped in two interelectrode non-woven fabrics,
Spacing is controlled in 1mm, controls flow of inlet water for 10ml/min, and the work electricity of 0V, 1.0V, 1.2V, 1.4V, 1.6V is applied respectively
Pressure, electric adsorption module is assembled into Activated Carbon Fiber Electrodes carries out Electro Sorb removal chromium ion experiment, as a result as Fig. 3 shows.It can be seen that
Modified activated fibre electrode pair Cr in the case of operating voltage is suitable6+With preferable adsorption effect.
Example IV
The acidified modified rear electrode production process of NACF is identical with embodiment one.
Experiment condition have chosen chromium ion concentration for 100mg/L, and operating voltage is controlled in 1.4V, and electrode spacing is by being clipped in two
Interelectrode non-woven fabrics isolation, spacing control have studied the adsorption effect of Activated Carbon Fiber Electrodes in 1mm.
Embodiment five
The acidified modified rear electrode production process of NACF is identical with embodiment one.
The electric adsorption electrode being made modified to NACF is circulated Electro Sorb experiment.By Activated Carbon Fiber Electrodes
In electric adsorption module, applying operating voltage is 1.4V, and flow of inlet water control is desorbed concentration in 15ml/min circulation absorptions
It is the Cr of 100mg/L6+Solution, calculates its adsorption rate and desorption rate.Experimental result is as shown in Figure 5.First time circulation absorption is desorbed
After experiment, the adsorption rate of NACF is 52.8%, by after five circulation absorption detachment assays, clearance reduced by only
8.08%, illustrate that the material has high regenerability.
Claims (6)
1. a kind of method that Electro Sorb removes chromium ion in water removal, it is characterised in that specifically include following steps：
(1) NACF acidification：Salt acid soak is used, substantial amounts of deionized water rinsing is then used, until pH value is neutrality,
Conductivity value is less than 5 μ Scm-1.110 DEG C of drying in baking oven are positioned over, are placed in drier and are obtained souring activity Carbon fibe；
(2) Activated Carbon Fiber Electrodes are prepared：Souring activity Carbon fibe in step (1) is cut into block size and obtains activated carbon
Fiber electrode；
(3) Electro Sorb removes weight in water removal during the Activated Carbon Fiber Electrodes assembling that will be obtained in step (2) is arranged on electric adsorption module
Metal ion；
(4) Electro Sorb method goes heavy metal ion in water removal：Configuration heavy metal ion solution, measures heavy metal ion solution in beaker
In, the Activated Carbon Fiber Electrodes electric adsorption module assembled in step (3) is carried out into Electro Sorb experiment.Electro Sorb experiment is using compacted
The heavy metal ion solution that dynamic pumping is taken in beaker enters into electric adsorption module, is finally recycled in beaker, while using conductance
The change of electrical conductivity in rate instrument real-time monitoring solution, when electrical conductivity keeps constant, i.e., Activated Carbon Fiber Electrodes reach absorption and put down
Weighing apparatus.
(5) desorption and regeneration of Activated Carbon Fiber Electrodes：When Activated Carbon Fiber Electrodes reach adsorption saturation, Electro Sorb mould will be applied to
Voltage short circuit or removal on block, the electrical conductivity in solution will be gradually restored to initial value, and electrode has obtained desorption and regeneration.
2. the method that a kind of Electro Sorb as described in claim 1 step removes chromium (sexavalence) ion in water removal, it is characterised in that step
Suddenly the concentration of the hydrochloric acid described in (1) is 1molL-1, soak time is 3h, and pH value is close to 6.9.
3. the method that a kind of Electro Sorb as claimed in claim 1 removes chromium (sexavalence) ion in water removal, it is characterised in that step
(2) the Activated Carbon Fiber Electrodes size described in is 5cm × 5cm.
4. the method that a kind of Electro Sorb as described in right 1 removes chromium (sexavalence) ion in water removal, it is characterised in that step (3) institute
The heavy metal ion that the Activated Carbon Fiber Electrodes Electro Sorb stated is gone in water removal is Cr6+。
5. the method that a kind of Electro Sorb as described in right 1 removes barium ions in water removal, it is characterised in that the electricity described in step (3)
The electrode logarithm of adsorption module is 3 pairs.
6. the method that a kind of Electro Sorb as described in right 1 removes chromium (sexavalence) ion in water removal, it is characterised in that step (4) institute
The heavy metal ion Cr for stating6+Concentration be 100mg/L, operating voltage is 1.4V, and flow of inlet water is 15ml/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710030634.5A CN106745556A (en) | 2017-01-17 | 2017-01-17 | A kind of Electro Sorb removes chromium in water removal（Sexavalence）The method of ion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710030634.5A CN106745556A (en) | 2017-01-17 | 2017-01-17 | A kind of Electro Sorb removes chromium in water removal（Sexavalence）The method of ion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113148973A (en) * | 2021-03-29 | 2021-07-23 | 中南大学 | Nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium, and preparation and application methods thereof |
| CN114988537A (en) * | 2022-07-01 | 2022-09-02 | 陕西科技大学 | Method for removing heavy metals in water by using capacitive deionization technology |
Citations (2)
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|---|---|---|---|---|
| CN103723801A (en) * | 2014-01-03 | 2014-04-16 | 湖南农业大学 | Combination electrode hydro-thermal synthesis method for removing arsenic in water based on electro-adsorption and arsenic removing method thereof |
| US20150299016A1 (en) * | 2012-08-03 | 2015-10-22 | Mitsubishi Heavy Industries Mechatronics Systems, Ltd. | Water treatment device |
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2017
- 2017-01-17 CN CN201710030634.5A patent/CN106745556A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150299016A1 (en) * | 2012-08-03 | 2015-10-22 | Mitsubishi Heavy Industries Mechatronics Systems, Ltd. | Water treatment device |
| CN103723801A (en) * | 2014-01-03 | 2014-04-16 | 湖南农业大学 | Combination electrode hydro-thermal synthesis method for removing arsenic in water based on electro-adsorption and arsenic removing method thereof |
Non-Patent Citations (2)
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| 20151031: "盐酸预处理对ACF结构及其电化学性能的影响", 《材料科学与工程学报》 * |
| 王翠 等: "活性炭纤维电极对不同阳离子电吸附行为的试验研究", 《中国新技术新产品》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113148973A (en) * | 2021-03-29 | 2021-07-23 | 中南大学 | Nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium, and preparation and application methods thereof |
| CN114988537A (en) * | 2022-07-01 | 2022-09-02 | 陕西科技大学 | Method for removing heavy metals in water by using capacitive deionization technology |
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