CN107459115B - Pd/NiAl metal oxide membrane electrode and preparation method and application thereof - Google Patents
Pd/NiAl metal oxide membrane electrode and preparation method and application thereof Download PDFInfo
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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
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4691—Capacitive deionisation
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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
- C02F2101/12—Halogens or halogen-containing compounds
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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
- C02F2101/163—Nitrates
Abstract
The invention provides a Pd/NiAl metal oxide membrane electrode and a preparation method and application thereof. In the Pd/NiAl metal oxide membrane electrode, the mass of Pd accounts for 1-10% of the mass of the Pd/NiAl metal oxide membrane electrode. The Pd/NiAl metal oxide membrane electrode of the invention mainly deposits Ni, Al and Pd on the foam nickel through in-situ hydrothermal reaction to obtain Pd/NiAl-LMO membrane electrode materials with different Pd deposition amounts. The prepared Pd/NiAl-LMO membrane electrode is used as a capacitance deionization electrode, can adsorb acid radical ions in water in the process of being used as a positive electrode for charging, is used as a negative electrode for discharging, converts the acid radical ions into harmless products under the catalytic action of Pd atoms, and is regenerated, so that acid salt concentrated water waste liquid is not generated in the process of capacitance deionization.
Description
Technical Field
The invention belongs to the technical field of water treatment, and relates to a Pd/NiAl metal oxide membrane electrode and a preparation method and application thereof.
Background
In recent years, the water body nitrate pollution event is concerned by researchers. Too high concentrations of nitrates, bromates, perchlorates and the like in drinking water can cause methemoglobinemia in infants and adults and also risk intestinal cancer in adults. Therefore, the search for an efficient and environment-friendly acid radical ion treatment method is an important problem to be solved.
The capacitive deionization technology attracts researchers' attention due to the advantages of energy conservation, no secondary pollution and fast regeneration. From the mechanism, under the action of an external electric field, the capacitive deionization technology removes salt ions in water through electro-adsorption and releases the adsorbed ions through a discharging process, so that the regeneration of the electrode is realized. At present, a great deal of researchers have used capacitive deionization technology to remove nitrate from water, and good results are obtained. However, the capacitive deionization desalination technology is only equivalent to the enrichment of salt ions, and finally the salt ions are released in the form of concentrated brine, and the salt ions are not degraded. For acid ions, concentrated brine still requires subsequent treatment to convert it into harmless substances.
Hydrotalcite as a pseudo-capacitance capacitor can realize the adsorption removal of anions in water through a memory effect, and therefore, hydrotalcite is used in an electro-adsorption desalination technology by many researchers. Research shows that the hydrotalcite can be used as an adsorbent to effectively remove acid radical ions in water. However, the subsequent treatment of the adsorbed acid ions remains a problem.
Qujuhui et Al have prepared hydrotalcites with different Mg/Al ratios and supported Pd/Sn catalysts for electro-adsorption and electro-reduction of nitrates. The result of the electric adsorption process shows that hydrotalcite with different Mg/Al ratios influences the adsorption capacity of the material on nitrate. In the catalytic reduction process, nitrate is effectively converted into N2And (5) removing. The research shows that the hydrotalcite has a certain adsorption effect on the nitrate, and the Pd/Sn can effectively catalyze and degrade the nitrate, so that the nitrate is harmlessly removed. The research proves that the electric adsorption and the electric reduction of acid radical ions are feasible by adding Pd into hydrotalcite.
Disclosure of Invention
In view of the defects of the prior art, an object of the present invention is to provide a Pd/NiAl metal oxide membrane electrode, which has a large specific capacitance and a reducing capability, and reduces acid radical ions to harmless products after adsorption, thereby realizing harmless treatment of the acid radical ions.
In order to achieve the purpose, the invention adopts the following technical scheme:
in the Pd/NiAl metal oxide membrane electrode, the mass of Pd accounts for 1-10% of the mass of the Pd/NiAl metal oxide membrane electrode.
The prepared Pd/NiAl-LMO membrane electrode is used as a working capacitor deionization electrode, an acid salt electro-adsorption-electro-reduction experiment is carried out, acid radical ions in water can be adsorbed in the process of being used as a positive electrode for charging, the acid radical ions are converted into harmless products under the catalytic action of Pd atoms in the process of being used as a negative electrode for discharging, the electrode is regenerated, and acid salt concentrated water waste liquid is not generated in the process of capacitor deionization.
The acid radical ions mainly are acid radical ions with variable valence states, and comprise nitrate radical ions, bromate radical ions and perchlorate radical ions. The prepared Pd/NiAl-LMO membrane electrode is used as a working capacitance deionization electrode to carry out an acid salt electro-adsorption-electro-reduction experiment, and harmful acid radical ions in water are converted into harmless products through valence state conversion.
The Pd atom-loaded layered metal oxide not only can efficiently adsorb acid radical ions, but also can convert the acid radical ions into harmless products under the catalytic action of the Pd atoms. Therefore, the metal oxide membrane electrodes with different Pd loading amounts are prepared by taking the foamed nickel as a substrate and adopting an in-situ hydrothermal method, namely Pd atoms are loaded on Ni/Al layered metal oxide and used for removing acid salt in water, so that the acid salt is adsorbed in the charging process and reduced and removed in the discharging process, and the electro-adsorption-electro-reduction of the acid salt is realized, and finally nitrate is converted into harmless products.
In the Pd/NiAl metal oxide membrane electrode of the invention, the mass of Pd accounts for 1-10% of the mass of the Pd/NiAl metal oxide membrane electrode, for example, the mass of Pd accounts for 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% of the mass of the Pd/NiAl metal oxide membrane electrode.
Preferably, the mass of the Pd accounts for 2-5% of the mass of the Pd/NiAl metal oxide membrane electrode, for example, the mass of the Pd accounts for 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5% of the mass of the Pd/NiAl metal oxide membrane electrode.
In the Pd/NiAl metal oxide membrane electrode, the molar ratio of Ni to Al is (1-5): 1-3, for example, the molar ratio of Ni to Al is 1:1, 1:2, 1:3, 2:1, 2:3, 3:1, 3:2, 4:1, 4:3, 5:1, 5:2, 5: 3; preferably, the molar ratio of Ni to Al is 3: 1.
The second purpose of the invention is to provide a preparation method of a Pd/NiAl metal oxide membrane electrode, which comprises the following steps:
1) pretreatment of foamed nickel: washing the foamed nickel with acid and ethanol, and drying;
2) preparing a Pd/NiAl hydroxide (Pd/NiAl-LDHs for short) membrane electrode: preparing NiCl2、AlCl3、PdCl2Mixing to obtain a mixed solution A; preparing NaOH and NaCO3Mixing to obtain a mixed solution B; adding the mixed solution B into the mixed solution A to adjust the pH value of the mixed solution A to 9.5-10.5; adding the mixed solution after the pH is adjusted into a reaction kettle, placing the foam nickel pretreated in the step 1) into the reaction kettle for in-situ hydrothermal reaction, and drying the foam nickel after the reaction to obtain a Pd/NiAl-LDHs membrane electrode;
3) preparing a Pd/NiAl metal oxide (Pd/NiAl-LMO for short) membrane electrode: calcining the Pd/NiAl-LDHs membrane electrode prepared in the step 2) to prepare the Pd/NiAl metal oxide membrane electrode.
The technical principle for preparing the Pd/NiAl metal oxide membrane electrode is as follows: depositing Ni, Al and Pd on the foamed nickel by in-situ hydrothermal reaction with the foamed nickel as a substrate, and calcining the sample to obtain the Pd/NiAl-LMO membrane electrode materials with different Pd deposition amounts.
In the step 1), the acid washing is ultrasonic cleaning in hydrochloric acid, the mass fraction of the hydrochloric acid is 0.5-2%, for example, the mass fraction of the hydrochloric acid is 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%; preferably, the mass fraction of the hydrochloric acid is 1%, and the pickling time is 10-20 min; preferably, the ethanol washing is ultrasonic cleaning in ethanol, and the time of the ethanol washing is 10-20 min; the purpose of the acid washing and the ethanol washing is to remove impurities on the surface of the foamed nickel.
Preferably, in the step 1), the drying temperature is 50-70 ℃, for example, the drying temperature is 50 ℃, 55 ℃, 60 ℃, 65 ℃ and 70 ℃.
In the step 2), the in-situ hydrothermal reaction is carried out by placing the reaction kettle in an oven, wherein the temperature of the in-situ hydrothermal reaction is 80-120 ℃, for example, the temperature of the in-situ hydrothermal reaction is 80 ℃, 90 ℃, 100 ℃, 110 ℃ and 120 ℃; the time of the in-situ hydrothermal reaction is 8-12 h, for example, the time of the in-situ hydrothermal reaction is 8h, 9h, 10h, 11h and 10 h.
Preferably, the drying is performed in an oven at a temperature of 50-70 ℃, for example, at a drying temperature of 50 ℃, 55 ℃, 60 ℃, 65 ℃, 70 ℃; the drying time is 10-15 h, for example, the drying time is 10h, 11h, 12h, 13h, 14h and 15 h.
In step 3), the calcination is carried out in a tube furnace, the calcination is carried out in two stages, the first stage of calcination is carried out in N2The first-stage calcination is carried out in an atmosphere and aims at removing impurity ions, the temperature of the first-stage calcination is 400-600 ℃, for example, the temperature of the first-stage calcination is 400 ℃, 450 ℃, 500 ℃, 550 ℃ and 600 ℃, and the time of the first-stage calcination is 3-5 h, for example, the time of the first-stage calcination is 3h, 4h and 5 h; the second stage of calcination is carried out in H2The second-stage calcination is carried out in an atmosphere to reduce the palladium hydroxide/palladium oxide to palladium, the temperature of the second-stage calcination is 200 to 300 ℃, for example, the temperature of the second-stage calcination is 200 ℃, 210 ℃, 220 ℃, 230 ℃, 240 ℃, 250 ℃, 260 ℃, 270 ℃, 280 ℃, 290 ℃ and 300 ℃, the time of the second-stage calcination is 2 to 4 hours, for example, the time of the second-stage calcination is 2 hours, 2.5 hours, 3 hours, 3.5 hours and 4 hours.
The invention also aims to provide a method for removing acid radical ions by adopting the Pd/NiAl metal oxide membrane electrode, which comprises the following steps: and (2) taking the Pd/NiAl metal oxide membrane electrode as a working electrode, taking activated carbon fiber as a counter electrode, placing the working electrode and the counter electrode in an acid salt solution, and applying voltage to remove acid radical ions.
The mass of the Pd accounts for 1-10% of the mass of the Pd/NiAl metal oxide membrane electrode.
The acid radical ions are nitrate radical ions, bromate radical ions or perchlorate radical ions, namely the acid salt can be nitrate, bromate or perchlorate. Taking nitrate as an example, the technical principle of removing nitrate by using a Pd/NiAl metal oxide (Pd/NiAl-LMO) membrane electrode is as follows: in the charging process, a specific positive voltage value is applied to the Pd/NiAl-LMO membrane electrode, so that nitrate ions in the solution move to the positive electrode under the action of an electric field force to generate electro-adsorption; in the discharging process, a specific negative voltage value is applied to the Pd/NiAl-LMO membrane electrode, so that adsorbed nitrate ions are subjected to a reduction reaction under the catalytic action of Pd, finally the nitrate ions are removed in a nitrogen form, and meanwhile, the electrode is regenerated.
The technical principle of bromate (or perchlorate) is as follows: in the charging process, a specific positive voltage value is applied to the Pd/NiAl-LMO membrane electrode, so that bromate (or perchlorate) ions in the solution move to the positive electrode under the action of an electric field force to generate electric adsorption; in the discharging process, a specific negative voltage value is applied to the Pd/NiAl-LMO membrane electrode, so that adsorbed bromate (or perchlorate) ions are subjected to a reduction reaction under the catalytic action of Pd, and finally bromate is harmlessly removed in the form of bromide ions (or perchlorate in the form of chloride ions), and the electrode is regenerated.
The distance between the working electrode and the counter electrode is 1-3 cm, and preferably 2 cm.
The applied voltage is 0.5-3.5V, for example, 0.5V, 1V, 1.5V, 2V, 2.5V, 3V, 3.5V, preferably 1V, 1.1V, 1.2V, 1.3V, 1.4V, 1.5V, 1.6V, 1.7V, 1.8V, 1.9V, 2V.
Compared with the prior art, the invention has the beneficial effects that:
(1) by loading metal Pd on the layered metal oxide, the capacitance of the layered metal oxide is improved, the diffusion resistance of ions in a solution is reduced, and the performance of an electrode material is improved.
(2) The Pd/NiAl-LMO membrane electrode has the advantages of simple preparation method, strong condition controllability and less operation flow.
(3) The Pd/NiAl-LMO membrane electrode not only has larger specific capacitance of 670F/g, but also has reducing capability, acid radical ions are adsorbed to the surface of the electrode in the charging process, and the acid radical ions can be reduced into harmless products in the discharging process, so that the electrode regeneration and the harmless treatment of the acid radical ions are realized. When the Pd/NiAl-LMO membrane electrode is used for processing nitrate, the Pd content is 2-5%, and the applied voltage value is 1-2V, so that the Pd/NiAl-LMO membrane electrode material has the best electro-adsorption-electro-reduction effect on the nitrate.
Drawings
FIG. 1(a) is a scanning electron microscope picture of the morphology characterization of the Pd/NiAl-LMO membrane electrode material prepared in example 1 of the present invention;
FIG. 1(b) is a scanning electron microscope picture of the morphology characterization of the NiAl-LMO membrane electrode material without supporting Pd prepared in example 1 of the present invention;
FIG. 2 is a graph showing the specific capacitance characteristics of Pd/NiAl-LMO membrane electrode material of example 1 of the present invention and the Pd-free NiAl-LMO membrane electrode material;
FIG. 3 is a graph comparing the effect of electro-adsorption-electro-reduction of nitrate of NiAl-LMO membrane electrode materials with different Pd loading amounts prepared in example 4 of the present invention;
FIG. 4 is a graph comparing the effect of electro-adsorption-electro-reduction of nitrate at different voltages for NiAl-LMO membrane electrode material with specific Pd loading amount prepared in example 5 of the present invention.
Detailed Description
The technical scheme of the invention is further illustrated by the attached figures 1, 2 and 3 and the specific embodiment.
Example 1
The Pd/NiAl-LMO membrane electrode and the NiAl-LMO membrane electrode of the present example were prepared by the following methods:
preparing 1.2mol/L NiCl20.4mol/L AlCl3Mixed liquor A (one group added with PdCl)2One group without PdCl2) And preparing NaOH and Na with certain concentration2CO3Adding a proper amount of the mixed solution B into 100ml of the mixed solution A, and adjusting the pH value of the mixed solution A to 9.5-10.5. And adding the mixed solution after the pH is adjusted into a 100ml reaction kettle, adding a piece of pretreated foamed nickel, and putting the reaction kettle into an oven at 100 ℃ for reaction for 10 hours. After the reaction kettle is cooled to room temperature, putting the reacted foam nickel into a 60 ℃ ovenDrying for 12H, calcining the electrode in a 500 ℃ tube furnace for 4H, and calcining in H2Calcining for 3h at 250 ℃ in the atmosphere to obtain the Pd/NiAl-LMO membrane electrode and the NiAl-LMO membrane electrode.
The Pd/NiAl-LMO membrane electrode material loaded with Pd and the NiAl-LMO membrane electrode material not loaded with Pd prepared in the example were subjected to morphology characterization, specific surface area determination and electrochemical characterization. The scanning electron microscope picture of the Pd/NiAl-LMO membrane electrode material appearance characterization is shown in figure 1(a), and the scanning electron microscope picture of the NiAl-LMO membrane electrode material appearance characterization is shown in figure 1 (b). The measurement results of the specific surface area and pore diameter of the Pd/NiAl-LMO membrane electrode material and the NiAl-LMO membrane electrode material not supporting Pd are shown in table 1, and the measurement results of the specific capacitance are shown in fig. 2. The result showed that the Pd/NiAl-LMO specific surface area was 44.52m2The specific capacitance 670F/g is larger than that of the NiAl-LMO membrane electrode material.
TABLE 1
Example 2
The Pd/NiAl-LMO membrane electrode and the NiAl-LMO membrane electrode of the present example were prepared by the following methods:
preparing 1.2mol/L NiCl20.4mol/L AlCl3Mixed liquor A (one group added with PdCl)2One group without PdCl2) And preparing NaOH and Na with certain concentration2CO3Adding a proper amount of the mixed solution B into 100ml of the mixed solution A, and adjusting the pH value of the mixed solution A to 9.5-10.5. And adding the mixed solution after the pH is adjusted into a 100ml reaction kettle, adding a piece of pretreated foamed nickel, and putting the reaction kettle into an oven at 100 ℃ for reaction for 10 hours. After the reaction kettle is cooled to room temperature, the reacted foam nickel is put into a 60 ℃ oven to be dried for 12 hours, then the electrode is put into a 500 ℃ tube furnace to be calcined for 4 hours, and the calcined electrode is put into H2Calcining for 3h at 250 ℃ in the atmosphere to obtain the Pd/NiAl-LMO membrane electrode and the NiAl-LMO membrane electrode.
During the experiment in this example, NaNO was added3Initial concentration of the solutionThe degree was set to 0.003 mol/L. Respectively using Pd/NiAl-LMO membrane electrode and NiAl-LMO membrane electrode as working electrodes, and applying a voltage of 1.0V to NO3 -Carrying out electric adsorption, and the adsorption reaches the balance when the adsorption time is 2.5 h. Then the nitrate ions are desorbed by inverting the cathode and the anode. By comparing the concentration change of nitrate radical in two experiments, NO in water sample treated by Pd/NiAl-LMO membrane electrode3 -The concentration is reduced by 47 percent and is higher than NO treated by NiAl-LMO3 -Concentration reduction (35%). Through morphological analysis of nitrogen-containing ions in the experimental process, the Pd/NiAl-LMO membrane electrode can lead NO to be generated in the desorption process3 -Reduction occurs, and the NiAl-LMO membrane electrode does not make NO3 -Reduction takes place.
Example 3
During the experiment, NaNO is added3The initial concentration of the solution was set to 0.003 mol/L. Pd/NiAl-LMO membrane electrode is used as a working electrode, and NO is treated under the condition that the voltage value is 1.0V3 -Carrying out electric adsorption, and the adsorption reaches the balance when the adsorption time is 2.5 h. Then the nitrate ions are subjected to electro-reduction by inverting the cathode and the anode, and are converted into harmless nitrogen for removal. By morphological analysis of nitrogen-containing ions in the experimental process, the Pd/NiAl-LMO membrane electrode can analyze NO3 -Reduction to NO2 -，NO2 -Further reducing to N2Removal, in the course of which NH is produced as a by-product4 +And a very small amount of N2O、NO。
Example 4
Pd/NiAl-LMO membrane electrode materials with 1-10% of Pd content are respectively prepared and are respectively used for electro-adsorption-electro-reduction nitrate experiments. For NO at a voltage value of 1.0V3 -Carrying out electric adsorption, and the adsorption reaches the balance when the adsorption time is 2.5 h. Then the nitrate ions are subjected to electro-reduction by inverting the cathode and the anode, and are converted into harmless nitrogen for removal. Through analysis of the change of the nitrate nitrogen concentration in the experimental process, when the Pd content is 2% -5%, the electro-adsorption-electro-reduction effect of the Pd/NiAl-LMO membrane electrode on nitrate ions is the best, and the experimental result is as shown in figure 3Shown in the figure.
Example 5
The Pd/NiAl-LMO membrane electrode material with the Pd content of 3 percent is prepared and used for an electro-adsorption-electro-reduction nitrate experiment. The effect of different voltages on nitrate removal was investigated by applying different voltage values (0.5-3.5V). When the adsorption time is 2.5h, the anode and the cathode are inverted to carry out electro-reduction on nitrate ions, and the nitrate ions are converted into harmless nitrogen to be removed. Through analysis of the change of the nitrate nitrogen concentration in the experimental process, when the applied voltage value is 1-2V, the Pd/NiAl-LMO membrane electrode material has the best electro-adsorption-electro-reduction effect on the nitrate, and the experimental result is shown in FIG. 4.
The applicant states that the present invention is illustrated by the above examples to show the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, i.e. it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (12)
1. A method for preparing a Pd/NiAl metal oxide membrane electrode is characterized by comprising the following steps:
1) pretreatment of foamed nickel: washing the foamed nickel with acid and ethanol, and drying;
2) preparing a Pd/NiAl-LDHs membrane electrode: preparing NiCl2、AlCl3、PdCl2Mixing to obtain a mixed solution A; preparing NaOH and NaCO3Mixing to obtain a mixed solution B; adding the mixed solution B into the mixed solution A to adjust the pH value of the mixed solution A to 9.5-10.5; adding the mixed solution after the pH is adjusted into a reaction kettle, placing the foam nickel pretreated in the step 1) into the reaction kettle for carrying out in-situ hydrothermal reaction for 8-12 h at 80-120 ℃, and drying the foam nickel after the reaction to obtain a Pd/NiAl-LDHs membrane electrode;
3) preparing a Pd/NiAl metal oxide membrane electrode: the Pd/NiAl-LDHs membrane electrode prepared in the step 2)Polar calcination, said calcination being carried out in a tube furnace, said calcination being carried out in two stages, the first stage being in N2The calcination is carried out in the atmosphere, the temperature of the first stage of calcination is 400-600 ℃, and the time of the first stage of calcination is 3-5 hours; the second stage of calcination is carried out in H2The second-stage calcination is carried out in the atmosphere, the temperature of the second-stage calcination is 200-300 ℃, and the time of the second-stage calcination is 2-4 hours, so that the Pd/NiAl metal oxide membrane electrode is prepared;
in the Pd/NiAl metal oxide membrane electrode, the mass of Pd accounts for 1-10% of the mass of the Pd/NiAl metal oxide membrane electrode; the molar ratio of Ni to Al is (1-5) to (1-3).
2. The preparation method according to claim 1, wherein in the step 1), the acid washing is ultrasonic cleaning in hydrochloric acid, the mass fraction of the hydrochloric acid is 0.5-2%, and the acid washing time is 10-20 min.
3. The preparation method according to claim 1, wherein in the step 1), the ethanol washing is ultrasonic cleaning in ethanol, and the time of the ethanol washing is 10-20 min.
4. The preparation method according to claim 1, wherein the drying temperature in step 1) is 50 to 70 ℃.
5. The preparation method according to claim 1, wherein in step 2), the in-situ hydrothermal reaction is carried out by placing the reaction kettle in an oven.
6. The preparation method according to claim 1, wherein in the step 2), the drying is carried out in an oven, the drying temperature is 50-70 ℃, and the drying time is 10-15 h.
7. A Pd/NiAl metal oxide membrane electrode obtained by the production method according to any one of claims 1 to 6.
8. A method for removing acid radical ions by adopting a Pd/NiAl metal oxide membrane electrode is characterized by comprising the following steps: the Pd/NiAl metal oxide membrane electrode of claim 7 is used as a working electrode, activated carbon fiber is used as a counter electrode, the working electrode and the counter electrode are placed in an acid salt solution, and acid radical ions are removed by applying voltage.
9. The method of claim 8, wherein the mass of the Pd is 1-10% of the mass of the Pd/NiAl metal oxide membrane electrode.
10. The method of claim 8, wherein the voltage is 0.5-3.5V.
11. The method of claim 8, wherein the distance between the working electrode and the counter electrode is 1-3 cm.
12. The method of claim 8, wherein the acid ion is a nitrate ion, a bromate ion, or a perchlorate ion.
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| CN101662029A (en) * | 2009-09-25 | 2010-03-03 | 北京化工大学 | Metallic oxide/carbon fiber composite material and preparation method and applications thereof |
| CN102779646A (en) * | 2011-05-12 | 2012-11-14 | 北京化工大学 | Nickel aluminum composite oxide thin film material and preparation method and applications thereof |
| CN104671362A (en) * | 2013-11-29 | 2015-06-03 | 中国科学院生态环境研究中心 | Electrode for removing bromate in water and preparation method thereof |
| CN106381506A (en) * | 2016-10-18 | 2017-02-08 | 西安交通大学 | Preparation method of layered ferronickel hydroxide electrode |
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| EP0037537A1 (en) * | 1980-04-03 | 1981-10-14 | Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. | Process for the manufacture of highly specific active char |
| CN101662029A (en) * | 2009-09-25 | 2010-03-03 | 北京化工大学 | Metallic oxide/carbon fiber composite material and preparation method and applications thereof |
| CN102779646A (en) * | 2011-05-12 | 2012-11-14 | 北京化工大学 | Nickel aluminum composite oxide thin film material and preparation method and applications thereof |
| CN104671362A (en) * | 2013-11-29 | 2015-06-03 | 中国科学院生态环境研究中心 | Electrode for removing bromate in water and preparation method thereof |
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