CN114835314B - Method for recycling nickel from chemical nickel plating waste liquid - Google Patents
Method for recycling nickel from chemical nickel plating waste liquid Download PDFInfo
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Abstract
A method for recovering nickel from chemical nickel plating waste liquid relates to a method for recovering nickel. The invention aims to solve the problems of large sludge amount, complex process, high cost and environmental pollution existing in the existing method for recovering nickel from chemical nickel plating wastewater. The method comprises the following steps: 1. pre-treating foam nickel; 2. electrolyzing; 3. recovering nickel; 4. washing the electrolyzed cathode, and drying to obtain the Ni-P-NF electrode. The Ni-P-NF electrode prepared by the invention has good electrocatalytic hydrogen evolution performance, and can be used for preparing hydrogen at 10mA cm ‑2 The overpotential at the current density of (2) is only 150mV, and the Tafel slope is 74mVdec ‑1 The hydrogen evolution kinetics is better, and the exposed active surface area reaches 820cm 2 The catalytic activity of the catalyst is also stronger; the invention has simple raw materials, simple preparation method, low cost and large-scale production. The invention is suitable for recovering nickel from chemical nickel plating waste liquid.
Description
Technical Field
The invention relates to a method for recovering nickel.
Background
The hydrogen is taken as a green clean energy source with great development prospect, the development and improvement of the hydrogen production industry are also important, the electrolytic water hydrogen production is the most environment-friendly of a plurality of hydrogen production methods, the low-carbon concept advocated in the world at present is very met, the electrolytic water hydrogen production is still limited by the cost, the efficiency of the electrolytic water hydrogen production is improved, and the cost is reduced, so that the main problem of the current hydrogen production industry is solved.
The general chemical nickel plating waste liquid contains 2000-7000 mg.L -1 80000-20000 mg.L nickel -1 Nickel is a relatively expensive metal resource, and particularly, due to the rapid development of new energy ternary nickel-cobalt-manganese batteries in recent years, the value of nickel metal is always high, and according to reports of the Yangtze river nickel industry network of China, the price of nickel is about 22 ten thousand yuan per ton. Therefore, the chemical nickel plating waste liquid with high nickel concentration is discharged randomly without treatment, so that the environment is polluted, and the resource waste is caused.
Among the various non-noble transition metals, nickel and its alloys have the dual advantages of low hydrogen evolution overpotential and low cost, and are considered to be promising candidates for HER electrocatalysis. In fact, the most widely used electrocatalysts in industrial alkaline water electrolysis are metallic nickel and its alloys. The chemical nickel plating waste water has nickel, sulfur and phosphorus, and after the chemical nickel plating waste water is treated by an electrolytic method, a large amount of nickel is electrodeposited on the polar plate, and the chemical nickel plating waste water is likely to be a potential hydrogen evolution catalyst.
In the existing various methods for treating chemical nickel plating waste liquid, the chemical precipitation method has the problems of large sludge quantity, difficult standard discharge and secondary pollution. The ion exchange method has no removal effect on organic matters, complex process, small treatment capacity, poor resin regeneration rate, limited exchange capacity and easy pollution, and has high one-time input cost. The membrane components used in the membrane separation method are expensive, the treatment cost is high, the strength of the membrane components is insufficient, the wastewater treatment capacity is limited, pollution can be generated, the membrane is easy to be blocked, and the regeneration problem is difficult to solve. The extraction method has the problem of large extractant consumption, and has little industrialized application in China.
Disclosure of Invention
The invention aims to solve the problems of large sludge amount, complex process, high cost and environmental pollution existing in the existing method for recovering nickel from chemical nickel plating waste water, and provides a method for recovering nickel from chemical nickel plating waste water.
The method for recovering nickel from chemical nickel plating waste liquid is completed according to the following steps:
1. foam nickel pretreatment:
cleaning the foam nickel, and then drying in vacuum to obtain pretreated foam nickel;
2. and (3) electrolysis:
adding the chemical nickel plating waste liquid into an electrolytic tank, adjusting the pH value of the chemical nickel plating waste liquid, adding sodium chloride, stirring, and adjusting the temperature of the chemical nickel plating waste liquid to obtain an electrolyte; taking a titanium ruthenium iridium electrode as an anode, taking pretreated foam nickel as a cathode, immersing the anode and the cathode into an electrolyte, and obtaining the titanium ruthenium iridium foam with the electrolytic density of 2A dm -2 ～15A·dm -2 Under the condition of electrolysis, obtaining electrolytic electroless nickel plating waste liquid and an electrolytic cathode;
3. recovering nickel:
regulating the pH value of the electrolyzed chemical nickel plating waste liquid, adding a heavy metal ion capturing agent, stirring, adding a coagulant aid and a flocculating agent, stirring, standing for precipitation, and collecting the precipitate to obtain recovered nickel;
4. washing the electrolyzed cathode by using deionized water and absolute ethyl alcohol in sequence, and drying to obtain the Ni-P-NF electrode.
The invention has the following beneficial effects:
1. the invention provides a self-supporting electrode obtained by electrolysis in chemical nickel plating wastewater for recycling electrocatalytic hydrogen evolution, which has higher activity on electrocatalytic hydrogen evolution reaction, and provides an electrolytic water hydrogen production catalyst Ni-P-NF electrode with high activity, low overpotential and low cost and easy availability;
2. the invention provides a feasible idea for preparing novel electrocatalytic materials in a large area by utilizing chemical nickel plating wastewater to prepare the low-cost and easily-obtained hydrogen evolution self-supporting electrode. The catalyst on the self-supporting electrode has larger electrochemical active area, good stability, low price, simple preparation process, low energy consumption in the preparation process and convenient industrialized production, provides key technology for expanding the application of the nickel-based electrocatalyst, replacing noble metal catalysts and realizing commercialization, is expected to solve the problem of chemical nickel plating waste liquid, and has important significance for promoting the commercialization of electrocatalytic hydrogen evolution reaction;
3. the invention provides a process for a combined treatment method for treating nickel ions in chemical nickel plating wastewater, which not only can reduce the nickel ions in the chemical nickel plating wastewater to be below the national standard, but also can recycle the nickel ions in the wastewater simultaneously as a hydrogen evolution electrocatalyst, thereby setting up a bridge for the electrocatalytic hydrogen evolution industry and the chemical nickel plating waste liquid treatment industry, and simultaneously providing a new thought for industrial electrocatalytic hydrogen evolution in cooperation with other industries;
4. the Ni-P-NF electrode prepared by the invention has good electrocatalytic hydrogen evolution performance, and can be used for preparing hydrogen at 10mA cm -2 The overpotential at the current density of (2) is only 150mV, and the Tafel slope is 74mVdec -1 The hydrogen evolution kinetics is better, and the exposed active surface area reaches 820cm 2 The catalytic activity of the catalyst is also stronger;
5. the invention has simple raw materials, simple preparation method, low cost and large-scale production.
The invention is suitable for recovering nickel from chemical nickel plating waste liquid.
Drawings
FIG. 1 is a surface morphology scanning electron microscope image of a Ni-P-NF electrode prepared in example 1 of the present invention and a bare NF electrode of comparative example 1, wherein a and b are bare NF electrodes, and c and d are Ni-P-NF electrodes;
FIG. 2 is an X-ray diffraction (XRD) pattern of the Ni-P-NF electrode prepared in example 1 of the present invention;
FIG. 3 is an X-ray spectroscopy (EDS) chart of the Ni-P-NF electrode prepared in example 1 of the present invention;
FIG. 4 is a graph of current density versus potential (LSV) for the Ni-P-NF electrode prepared in example 1 of the present invention and the bare NF electrode of comparative example 1;
FIG. 5 shows the Ni-P-NF electrode of example 1 of the present invention and the bare NF electrode of comparative example 1 at 10mA cm -2 Corresponding to the overpotential at the current density;
FIG. 6 is a graph of current density versus time for the Ni-P-NF electrode prepared in example 1 of this invention.
FIG. 7 is a graph of current density versus potential (LSV) for Ni-P-NF electrodes prepared in examples 1-5 of this invention;
FIG. 8 shows the Ni-P-NF electrodes produced in examples 1-5 of the present invention at 10mAcm -2 Corresponding to the overpotential at the current density.
Detailed Description
The following examples further illustrate the invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the present invention without departing from the spirit of the invention are intended to be within the scope of the present invention.
The first embodiment is as follows: the method for recycling nickel from chemical nickel plating waste liquid in the embodiment is specifically completed by the following steps:
1. foam nickel pretreatment:
cleaning the foam nickel, and then drying in vacuum to obtain pretreated foam nickel;
2. and (3) electrolysis:
adding the chemical nickel plating waste liquid into an electrolytic tank, adjusting the pH value of the chemical nickel plating waste liquid, adding sodium chloride, stirring, and adjusting the temperature of the chemical nickel plating waste liquid to obtain an electrolyte; taking a titanium ruthenium iridium electrode as an anode, taking pretreated foam nickel as a cathode, immersing the anode and the cathode into an electrolyte, and obtaining the titanium ruthenium iridium foam with the electrolytic density of 2A dm -2 ～15A·dm -2 Under the condition of electrolysis, obtaining electrolytic electroless nickel plating waste liquid and an electrolytic cathode;
3. recovering nickel:
regulating the pH value of the electrolyzed chemical nickel plating waste liquid, adding a heavy metal ion capturing agent, stirring, adding a coagulant aid and a flocculating agent, stirring, standing for precipitation, and collecting the precipitate to obtain recovered nickel;
4. washing the electrolyzed cathode by using deionized water and absolute ethyl alcohol in sequence, and drying to obtain the Ni-P-NF electrode.
The invention recycles the chemical nickel plating waste liquid, and removes nickel in the waste water through electrolysis, thereby nickel is equivalent to being electroplated on the foam nickel polar plate, and the foam nickel polar plate loaded with nickel can be directly used as an electrode material for electrocatalytic hydrogen evolution reaction, and the thought effectively solves two problems of electrolytic water hydrogen production and chemical nickel plating waste liquid treatment; the invention skillfully selects the chemical nickel plating wastewater as a source of the hydrogen evolution catalyst and applies the chemical nickel plating wastewater to the electrocatalytic hydrogen evolution reaction, thereby not only solving the wastewater treatment problem and protecting the environment, but also utilizing the waste, changing waste into valuables, and the obtained catalyst hydrogen evolution result shows that the catalyst has higher hydrogen evolution performance;
the electrode recovered and reused from chemical nickel plating wastewater is applied to electrocatalytic hydrogen evolution reaction, and the chemical nickel plating solution has very complex composition and generally comprises the following main components: nickel salt, hypophosphite, phosphite, phosphate, organic complexing agent, brightening agent and the like, wherein an electrode obtained by electrolytic recovery takes Ni and P as main components and also contains a small amount of Fe, and a large number of researches show that nickel phosphide and nickel phosphorus alloy are effective high-activity hydrogen evolution catalysts, so that Ni and P active substances on the surface of the electrode can be used as high-efficiency hydrogen evolution electrocatalysts, and the electrode is a promising hydrogen evolution cathode material in industrial full-scale water;
the recovered electrode takes Ni and P as main components, wherein the meaning of the main components is that the sum of the mass percentages of the Ni and the P is more than 50 percent; the nickel foam substrate of the present invention may be a commercial nickel foam.
The second embodiment is as follows: the present embodiment differs from the specific embodiment in that: firstly, soaking foam nickel in absolute ethyl alcohol, ultrasonically cleaning for 10-20 min, then soaking in hydrochloric acid with the mass fraction of 20% for cleaning for 10-20 min, then cleaning to be neutral by using deionized water, and finally drying in vacuum to obtain the pretreated foam nickel. The other steps are the same as in the first embodiment.
And a third specific embodiment: this embodiment differs from the first or second embodiment in that: the electrolysis time in the second step is 30-120 min; the temperature of the electrolyte in the second step is 40-70 ℃. The other steps are the same as those of the first or second embodiment.
The specific embodiment IV is as follows: one difference between this embodiment and the first to third embodiments is that: the concentration of sodium chloride in the electrolyte in the second step is 20 g.L -1 . The other steps are the same as those of the first to third embodiments.
Fifth embodiment: one to four differences between the present embodiment and the specific embodiment are: step two, regulating the pH value of the chemical nickel plating waste liquid to 7-9; and step two, stirring for 5-10 min. Other steps are the same as those of the first to fourth embodiments.
Specific embodiment six: the present embodiment differs from the first to fifth embodiments in that: step three, regulating the pH value of the electrolyzed electroless nickel plating waste liquid to 8; and step three, adding a heavy metal ion capturing agent, and stirring for 20-40 min. Other steps are the same as those of the first to fifth embodiments.
Seventh embodiment: one difference between the present embodiment and the first to sixth embodiments is that: adding coagulant aid and flocculant, and stirring for 5-10 min; the heavy metal ion capturing agent in the third step is PCN-2, purchased from the complex environmental protection engineering Co., ltd., the mass ratio of the heavy metal ion capturing agent to the chemical nickel plating waste liquid is (0.05 g-0.5 g) (1000 mL-1000 mL). Other steps are the same as those of embodiments one to six.
Eighth embodiment: one difference between the present embodiment and the first to seventh embodiments is that: the coagulant aid in the third step is polyacrylamide, and the volume ratio of the mass of the coagulant aid to the chemical nickel plating waste liquid is (20 g-50 g) (1000 mL-1000 mL); the flocculant in the third step is polyaluminum chloride, and the volume ratio of the mass of the flocculant to the chemical nickel plating waste liquid is (1 g-5 g) (1000 mL-1000 mL). The other steps are the same as those of embodiments one to seven.
Detailed description nine: one of the differences between this embodiment and the first to eighth embodiments is: and step four, washing the electrolyzed cathode for 3 to 5 times respectively by using deionized water and absolute ethyl alcohol in sequence, and then drying in vacuum. Other steps are the same as those of embodiments one to eight.
Detailed description ten: the present embodiment differs from the first to ninth embodiments in that: the Ni-P-NF electrode in the fourth step is used for electrocatalytic hydrogen production. The other steps are the same as those of embodiments one to nine.
The following examples are used to verify the benefits of the present invention:
example 1: the method for recovering nickel from chemical nickel plating waste liquid is completed according to the following steps:
1. foam nickel pretreatment:
cutting foam nickel into 100mm multiplied by 50mm multiplied by 1mm, soaking the foam nickel in absolute ethyl alcohol, ultrasonically cleaning for 20min, soaking the foam nickel in hydrochloric acid with the mass fraction of 20% for 10min, cleaning the foam nickel to be neutral by using deionized water, and finally vacuum drying the foam nickel at the temperature of 70 ℃ for 6h to obtain pretreated foam nickel;
2. and (3) electrolysis:
adding 350mL of chemical nickel plating waste liquid into an electrolytic tank, adjusting the pH value of the chemical nickel plating waste liquid to 9, adding 7g of sodium chloride, stirring for 5min, and adjusting the temperature of the chemical nickel plating waste liquid to 70 ℃ to obtain an electrolyte with the temperature of 70 ℃; taking a titanium ruthenium iridium electrode as an anode, taking pretreated foam nickel as a cathode, immersing the anode and the cathode into an electrolyte, and obtaining the titanium ruthenium iridium foam with the electrolysis density of 5A dm -2 The electrolysis is carried out for 60min under the condition of obtaining the electrolytic electroless nickel plating waste liquid and the electrolytic cathode;
3. recovering nickel:
regulating the pH value of the electrolyzed chemical nickel plating waste liquid to 8, adding a heavy metal ion capturing agent PCN-2, stirring for 30min, adding polyaluminium chloride (PAC) and Polyacrylamide (PAM), stirring for 10min, standing for 25min, and collecting precipitate to obtain recovered nickel;
4. and respectively washing the electrolyzed cathode for 3 times by using deionized water and absolute ethyl alcohol in sequence, and drying for 10 hours in a vacuum box at the temperature of 60 ℃ to obtain the Ni-P-NF electrode.
Comparative example 1: the electrode of comparative document 1 was nickel foam, i.e., bare NF.
FIG. 1 is a surface morphology scanning electron microscope image of a Ni-P-NF electrode prepared in example 1 of the present invention and a bare NF electrode of comparative example 1, wherein a and b are bare NF electrodes, and c and d are Ni-P-NF electrodes;
fig. 1 a and b are SEM images of nickel foam; as can be seen from fig. 1 a, b, the foamed nickel substrate is smooth and flat, and does not contain any catalyst attached to its surface. In FIG. 1, c and d are SEM images of Ni-P-NF electrode materials. As can be seen from fig. 1c, the foam nickel substrate is fully covered with a layer of nickel nanoparticles, indicating that the nickel catalyst has been successfully grown on the foam nickel substrate; as can be seen from fig. 1 d, the nickel nanoparticles are mostly spherical or bulk, the size of which is about 50nm, and the nickel nanomaterial covered on the foam nickel can increase the specific surface area, expose more active sites, and provide more electron transfer paths to promote electrocatalytic performance.
FIG. 2 is an X-ray diffraction (XRD) pattern of the Ni-P-NF electrode prepared in example 1 of the present invention;
FIG. 2 is an XRD pattern of catalyst powder scraped from Ni-P-NF electrode; the bare NF electrode and the Ni-P-NF electrode both correspond to three characteristic peaks of nickel (JCPDS No. 87-0712), but the Ni-P-NF electrode has one more inclusion peak at 44.49 DEG, which is a peak of nickel electrodeposited onto the nickel foam, compared with the bare NF electrode, and XRD of the Ni-P powder scraped from the Ni-P-NF electrode verifies the result, which corresponds to the (111) crystal plane of metallic nickel. The intensity of the peaks is not high, indicating that the crystallinity of the nickel is not high, but that the nickel is successfully deposited on the nickel foam.
FIG. 3 is an X-ray spectroscopy (EDS) chart of the Ni-P-NF electrode prepared in example 1 of the present invention;
the EDS dotted results and spectra further confirm the elemental composition, at atomic percentages 62.84% (Ni), 18.78% (P), 15.37% (O) and 2.94% (Fe), respectively, where the high oxygen content may result from oxidation of the Ni-P-NF electrode in air.
Hydrogen evolution performance test:
cutting a bare NF electrode and a Ni-P-NF electrode into small electrodes with the length of 1cm multiplied by 1cm respectively, carrying out electrocatalytic hydrogen evolution reaction by adopting a three-electrode system, taking the Ni-P-NF electrode and the bare NF electrode as cathodes of the electrocatalytic hydrogen evolution reaction, taking a carbon rod as a counter electrode, taking a calomel electrode as a reference electrode, adopting a linear voltammetry, wherein the potential range of the linear voltammetry is 0 DEG
1V.vs(RHE)。
The Ni-P-NF electrode in example 1 and the bare NF electrode in comparative example 1 were used as hydrogen evolution self-supporting electrodes for hydrogen evolution performance test. The testing method comprises the following steps: the three-electrode test system is adopted on an electrochemical workstation CHI660E, and the test electrolyte is 1 mol.Lm saturated by nitrogen -1 The test temperature is room temperature, and the scanning rate is 2 mV.s when the linear sweep voltammetry curve is tested -1 And the solution ohm drop iR compensation correction is performed and converted to the electrode potential of the Reversible Hydrogen Electrode (RHE). Stability test results are recorded by potential versus time curves.
FIG. 4 is a graph of current density versus potential (LSV) for the Ni-P-NF electrode prepared in example 1 of the present invention and the bare NF electrode of comparative example 1;
as can be seen from fig. 4, the Ni-P-NF electrode exhibited higher hydrogen evolution activity in alkaline medium. Reading-10 mA cm from FIG. 4 -2 The lower overpotential yields fig. 5;
FIG. 5 shows the Ni-P-NF electrode of example 1 of the present invention and the bare NF electrode of comparative example 1 at 10mA cm -2 Corresponding to the overpotential at the current density;
as can be seen from FIG. 5, the current density is-10 mA cm -2 In the following, the overpotential of the bare NF electrode of comparative example 1 is 238mV, while the overpotential of the Ni-P-NF electrode of the invention is only 150mV, so the activity of the catalyst prepared by the invention is obviously higher than that of blank foam nickel.
The long-time hydrogen evolution stability test chart of the catalyst 1 in KOH (1M) electrolyte is shown in FIG. 6;
FIG. 6 is a graph of current density versus time for the Ni-P-NF electrode prepared in example 1 of this invention.
As can be seen from FIG. 6, the current density of the Ni-P-NF electrode was always maintained at 20 mA.cm after the electrolysis was continued for 15 hours -2 No obvious attenuation exists on the left and right sides, which shows that the Ni-P-NF electrode prepared by the invention has good stability.
As described above, the Ni-P-NF electrode of the present invention drives 5mA cm -2 The time overpotential is obviously reduced, the stability is good, and the catalyst is expected to be a substitute material of noble metal catalysts in the field of industrial-grade water electrolysis hydrogen production.
Example 2: the difference between this embodiment and embodiment 1 is that: in the second step, the electrolytic density is 0.5 A.dm -2 The electrolysis was carried out for 60 minutes under the same conditions as in example 1, except that the other steps and parameters were the same.
Example 3: the difference between this embodiment and embodiment 1 is that: in the second step, the electrolytic density is 2A dm -2 The electrolysis was carried out for 60 minutes under the same conditions as in example 1, except that the other steps and parameters were the same.
Example 4: the difference between this embodiment and embodiment 1 is that: in the second step, the electrolytic density is 10A dm -2 The electrolysis was carried out for 60 minutes under the same conditions as in example 1, except that the other steps and parameters were the same.
Example 5: the difference between this embodiment and embodiment 1 is that: in the second step, the electrolytic density is 13A dm -2 The electrolysis was carried out for 60 minutes under the same conditions as in example 1, except that the other steps and parameters were the same.
FIG. 7 is a graph of current density versus potential (LSV) for Ni-P-NF electrodes prepared in examples 1-5 of this invention;
FIG. 8 shows the Ni-P-NF electrodes produced in examples 1-5 of the present invention at 10mAcm -2 Corresponding to the overpotential at the current density.
The electrolytic density in FIGS. 7 and 8 was 0.5A. Dm -2 The curve of (2) is example 2, the electrolytic density is 2A.dm -2 The curve of (3) is example 3, the electrolytic density is 5A dm -2 The curve of (2) is example 1, the electrolytic density is 10A.dm -2 The curve of (2) is example 4, the electrolytic density is 13A dm -2 Is the curve of example 5;
examples 1 to 5 each examined 0.5A dm -2 、2A·dm -2 、5A·dm -2 、10A·dm -2 And 13A dm -2 5 effects of current Density on the Performance of the prepared catalysts, where they were measured at 10mA cm -2 The overpotential at the current density was only 167mV, 166mV, 150mV, 153mV, 202mV, respectively, as shown in FIGS. 7-8, and it was found that the optimal current density preparation process was 5A. Dm -2 。
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (1)
1. A method for recovering nickel from chemical nickel plating waste liquid is characterized in that the Ni-P-NF electrode obtained by the method is used for electrocatalytic hydrogen production, and the Ni-P-NF electrode has good electrocatalytic hydrogen evolution performance in alkaline medium, and is 10mA cm -2 The overpotential at the current density of (2) is only 150mV, and the Tafel slope is 74mVdec -1 The exposed active surface area also reaches 820cm 2 The method is specifically completed by the following steps:
1. foam nickel pretreatment:
cutting foam nickel into 100mm multiplied by 50mm multiplied by 1mm, soaking the foam nickel in absolute ethyl alcohol, ultrasonically cleaning for 20min, soaking the foam nickel in hydrochloric acid with the mass fraction of 20% for 10min, cleaning the foam nickel to be neutral by using deionized water, and finally vacuum drying the foam nickel at the temperature of 70 ℃ for 6h to obtain pretreated foam nickel;
2. and (3) electrolysis:
adding 350mL of chemical nickel plating waste liquid into an electrolytic tank, adjusting the pH value of the chemical nickel plating waste liquid to 9, adding 7g of sodium chloride, stirring for 5min, and adjusting the temperature of the chemical nickel plating waste liquid to 70 ℃ to obtain an electrolyte with the temperature of 70 ℃; taking a titanium ruthenium iridium electrode as an anode, taking pretreated foam nickel as a cathode, immersing the anode and the cathode into electrolyte, and obtaining the titanium ruthenium iridium foam anode with the electrolytic density of 5A·dm -2 The electrolysis is carried out for 60min under the condition of obtaining the electrolytic electroless nickel plating waste liquid and the electrolytic cathode;
3. recovering nickel:
regulating the pH value of the electrolyzed chemical nickel plating waste liquid to 8, adding a heavy metal ion capturing agent PCN-2, stirring for 30min, adding polyaluminium chloride and polyacrylamide, stirring for 10min, standing for 25min, and collecting precipitate to obtain recovered nickel;
4. and respectively washing the electrolyzed cathode for 3 times by using deionized water and absolute ethyl alcohol in sequence, and drying for 10 hours in a vacuum box at the temperature of 60 ℃ to obtain the Ni-P-NF electrode.
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