CN112875678A - Method for preparing carbon material by using dye wastewater as raw material - Google Patents
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- CN112875678A CN112875678A CN202110200078.8A CN202110200078A CN112875678A CN 112875678 A CN112875678 A CN 112875678A CN 202110200078 A CN202110200078 A CN 202110200078A CN 112875678 A CN112875678 A CN 112875678A
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
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Abstract
The invention relates to a method for preparing a carbon material by taking dye wastewater as a raw material. A method for preparing a carbon material by taking dye wastewater as a raw material comprises the following steps: and (3) carrying out plasma treatment on the dye wastewater, cooling, standing, carrying out suction filtration, and carrying out vacuum drying to obtain the solid powder carbon material. The method for preparing the carbon material by using the dye wastewater as the raw material provides a new idea for the traditional degradation of the dye wastewater, and realizes the resource utilization of the dye wastewater while degrading, thereby achieving the purposes of recycling of wastes, environmental protection and no pollution.
Description
Technical Field
The invention particularly relates to a method for preparing a carbon material by taking dye wastewater as a raw material.
Background
In 1856, synthetic dyes were invented by Walsh Parkins (WH Perkins) to provide various vivid, fast-fading hues. With the improvement of living standard of people, the pursuit of quality of substances is higher and higher, and the pigment is widely used by human as a necessity for enriching the sensory requirements of people. Meanwhile, a series of problems are brought while the requirements of people are met. Since dyes have color developability, they are a necessity for various important industries such as leather, paper and textile industries. It is estimated that there are approximately 10 million commercial dyes each year producing dyes of different colors, whereas synthetic dyes are mainly composed of organic substances. Organic dyes are one of the most common pollutants in wastewater, are usually toxic and carcinogenic, and pose a serious threat to animal and plant health as well as human health.
Prior techniques for removing dye contaminants include adsorption, coagulation, microbial treatment, photocatalysis, and electrochemical oxidation/reduction, among others. However, most dyes are difficult to completely remove due to their complex structure, and only the dye molecules can be degraded.
At present, Manavi et al form aerobic particles from traditional activated sludge through anaerobic circulation in a synthetic medium, and then use the aerobic particles for actual printing and dyeing wastewater treatment, wherein the aerobic particles successfully adapt to actual printing and dyeing wastewater under the conditions of 24-hour circulation time and 3 anaerobic-to-aerobic ratio, the decolorization rate is 73%, and the COD removal rate is 68%. Wu et al prepared a magnetic carbon-iron composite by hydrothermal method and studied its application as a high efficiency adsorbent for removing disperse blue dye (db56) and reactive yellow dye (RY3) in aqueous solution. As a result, it was found that under acidic conditions at pH 2, removal rates of db56 and RY3 were 81.53% and 96.77%, respectively. Although there are many methods for treating dye wastewater at present, these methods can only be used for degrading dye wastewater, and cannot convert dye wastewater into carbon material which can be recycled.
In view of the above, the present invention provides a novel method for treating dye wastewater, which can directly convert dye wastewater into a carbon material, so that the purpose of dye removal can be achieved, and the dye can be recycled.
Disclosure of Invention
The invention aims to provide a method for preparing a carbon material by taking dye wastewater as a raw material, which adopts a plasma technology to convert dye molecules in a water phase into the carbon material so as to achieve the purposes of degradation and resource recycling.
In order to realize the purpose, the adopted technical scheme is as follows:
a method for preparing a carbon material by taking dye wastewater as a raw material comprises the following steps: and (3) carrying out plasma treatment on the dye wastewater, cooling, standing, carrying out suction filtration, and carrying out vacuum drying to obtain the solid powder carbon material.
Further, the plasma treatment comprises the following steps: placing the dye wastewater in a reactor, ensuring that an electrode is positioned at a gas-liquid interface, and adjusting the electrode gap in the reactor;
connecting the reactor and the oscilloscope with a power supply;
and switching on a power supply, and performing continuous stable discharge after plasma is generated by adjusting discharge parameters.
Further, the concentration of the dye wastewater is more than 50mg/L and not more than 1000 mg/L;
the voltage of the continuous discharge is more than 8 KV.
Further, the concentration of the dye wastewater is 200-600 mg/L;
the voltage of the continuous discharge is more than 8KV and not more than 20 KV.
Further, the concentration of the dye wastewater is 400 mg/L;
the voltage of the continuous discharge is 12 KV.
Still further, the continuous discharge time is 60 min.
Furthermore, the electrode gap in the reactor is 1mm, and the electrode is positioned in a gas-liquid interface, namely, the solution submerges in the electrode by 5 mm.
Furthermore, the power supply is a pulse power supply.
Further, the vacuum drying temperature is 80 ℃, and the time duration is 12 hours.
Further, the dye in the dye wastewater is methyl orange, methylene blue or rhodamine B.
Compared with the prior art, the invention has the beneficial effects that:
1. the technical scheme for converting the dye in the dye wastewater into the carbon material by resource utilization is a simple, low-cost and environment-friendly process at normal temperature and normal pressure without adding a catalyst.
2. The technical scheme of the invention converts the dye in the dye wastewater into the carbon material with the electrocatalytic performance, can achieve the purpose of recycling waste, simultaneously solves the problems of environmental pollution, energy shortage and the like, and has very important significance from the economic perspective and the practical perspective.
Drawings
FIG. 1 is a reaction apparatus used in an embodiment of the present invention; wherein, 1 is a pulse power supply, 2 is a self-made reactor, and 3 is an oscilloscope;
FIG. 2 is an SEM image of a treated carbon material prepared by simulating dye wastewater with a methyl orange aqueous solution according to example 1 of the present invention;
FIG. 3 is an SEM image of a treated carbon material prepared by simulating dye wastewater with methylene blue aqueous solution according to example 2 of the present invention;
FIG. 4 is an SEM image of a treated carbon material prepared by simulating dye wastewater with a rhodamine B aqueous solution in example 3 of the invention;
FIG. 5 is a performance diagram of the carbon material prepared by using methyl orange as a carbon precursor in the HER process according to the invention in example 1;
FIG. 6 is a performance diagram of the application of the carbon material prepared by using methylene blue as a carbon precursor in the HER process in example 2 of the present invention;
FIG. 7 is a performance diagram of the application of the carbon material prepared by using rhodamine B as a carbon precursor in the HER process, prepared in example 3 of the invention;
FIG. 8 is a graph showing the discharge voltage of plasma treatment in accordance with the carbon material production amount in example 5 of the present invention;
FIG. 9 is a graph showing the relationship between the concentration of the dye wastewater and the yield of the carbon material in example 7 of the present invention.
Detailed Description
In order to further illustrate the method for preparing carbon material from dye wastewater according to the present invention, and achieve the intended purpose, the following embodiments, structures, features and effects thereof will be described in detail with reference to the accompanying drawings. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Before describing the method for preparing the carbon material by using the dye wastewater as the raw material in detail, it is necessary to further describe the related materials mentioned in the present invention to achieve better effects.
Methyl orange, sodium p-dimethylaminoazobenzenesulfonate or sodium 4- ((4- (dimethylamino) phenyl) azo) benzenesulfonate with molecular formula C14H14N3SO3Na, molecular weight 327.33, CAS number 547-58-0.
Methylene blue, 3, 7-bis (dimethylamino) phenothiazin-5-ium chloride, formula C16H18ClN3S, molecular weight 319.86, CAS number 61-73-4.
Rhodamine B, molecular formula C28H31ClN2O3Molecular weight 479.01, CAS number 81-88-9.
With the knowledge of the relevant materials mentioned in the present invention, the method for preparing carbon material from dye wastewater according to the present invention will be described in further detail with reference to the following specific examples:
the invention overcomes the difficulty that the plasma technology can not generate the carbon material in the water phase by adjusting the plasma discharge parameters and the plasma discharge form, provides a method for converting dye molecules in the water phase into the carbon material by adopting the plasma technology, and achieves the purposes of degradation and resource recycling. The technical scheme of the invention is as follows:
a method for preparing a carbon material by taking dye wastewater as a raw material comprises the following steps: and (3) carrying out plasma treatment on the dye wastewater, cooling, standing, carrying out suction filtration, and carrying out vacuum drying to obtain the solid powder carbon material.
Preferably, the plasma treatment step is: placing the dye wastewater in a reactor, ensuring that an electrode is positioned at a gas-liquid interface, and adjusting the electrode gap in the reactor;
connecting the reactor and the oscilloscope with a power supply;
and switching on a power supply, and performing continuous stable discharge after plasma is generated by adjusting discharge parameters.
Preferably, the concentration of the dye wastewater is more than 50mg/L and not more than 1000 mg/L;
the voltage of the continuous discharge is more than 8 KV.
Further preferably, the concentration of the dye wastewater is 200-600 mg/L;
the voltage of the continuous discharge is more than 8KV and not more than 20 KV.
Further preferably, the concentration of the dye wastewater is 400 mg/L;
the voltage of the continuous discharge is 12 KV.
Further preferably, the continuous discharge time is 60 min.
Preferably, the electrode gap in the reactor is 1mm, and the electrode is positioned in the gas-liquid interface, so that the solution passes through the electrode within 5 mm.
Preferably, the power supply is a pulse power supply.
Preferably, the vacuum drying temperature is 80 ℃ and the time duration is 12 hours.
Preferably, the dye in the dye wastewater is methyl orange, methylene blue or rhodamine B.
Example 1.
The specific operation steps are as follows:
200mg of methyl orange is weighed, poured into a 500mL beaker, added with deionized water, and prepared into a 400mg/L methyl orange solution in a 500mL volumetric flask. And (3) adopting magnetic stirring, wherein the rotating speed of the magnetic stirring is 300r/min, the stirring time is 0.5 hour, and completely dissolving methyl orange in deionized water through the magnetic stirring to obtain the dye wastewater.
As shown in FIG. 1, a plasma generator (i.e., a pulse power supply) was connected to a reactor and an oscilloscope, the reactor was fixed, and the electrode gap in the reactor was adjusted to 1 mm. And pouring the prepared dye wastewater into a reactor, wherein the electrode is positioned at a gas-liquid interface, and the solution is submerged in the electrode within 5 mm. And electrifying, adjusting the scale of the autotransformer to 50V, starting a pulse power supply, generating plasma by adjusting discharge parameters, adjusting the discharge voltage to 12kV, continuously and stably discharging for 60min, then closing the pulse power supply, and cutting off an electrifying circuit.
And (3) pouring the dye wastewater treated by the plasma in the reactor into a beaker, naturally cooling, standing, performing suction filtration by using a 22-micron filter membrane, and washing by using deionized water to obtain a product. The washed product was then dried under vacuum at 80 ℃ for 12h, and the dried product was scraped off the filter to give a solid powdered carbon material, the SEM of which is shown in FIG. 2.
Example 2.
The specific operation steps are as follows:
200mg of methylene blue is weighed, poured into a 500mL beaker, added with deionized water, and prepared into a 400mg/L methylene blue solution in a 500mL volumetric flask. And (3) stirring by adopting magnetic force, wherein the rotating speed of the magnetic stirring is 300r/min, the stirring time is 0.5 hour, and the methylene blue is completely dissolved in the deionized water by the magnetic stirring to obtain the dye wastewater.
The plasma generating device (i.e. pulse power supply) is connected with the reactor and the oscilloscope, the reactor is fixed, the electrode distance is adjusted, and the electrode gap in the reactor is 1 mm. And pouring the prepared dye wastewater into a reactor, wherein the electrode is positioned at a gas-liquid interface, and the solution is submerged in the electrode within 5 mm. And electrifying, adjusting the scale of the autotransformer to 50V, starting a pulse power supply, generating plasma by adjusting discharge parameters, adjusting the discharge voltage to 12kV, continuously and stably discharging for 60min, then closing the pulse power supply, and cutting off an electrifying circuit.
And (3) pouring the dye wastewater treated by the plasma in the reactor into a beaker, naturally cooling, standing, performing suction filtration by using a 22-micron filter membrane, and washing by using deionized water to obtain a product. The washed product was then dried under vacuum at 80 ℃ for 12h, and the dried product was scraped off the filter to give a solid powdered carbon material, the SEM of which is shown in FIG. 3.
Example 3.
The specific operation steps are as follows:
200mg of rhodamine B is weighed, poured into a 500mL beaker, added with deionized water, and prepared into a rhodamine B solution with the concentration of 400mg/L in a 500mL volumetric flask. And (3) adopting magnetic stirring, wherein the rotating speed of the magnetic stirring is 300r/min, the stirring time is 0.5 hour, and completely dissolving rhodamine B in deionized water through the magnetic stirring to obtain the dye wastewater.
As shown in FIG. 1, a plasma generator (i.e., a pulse power supply) was connected to a reactor and an oscilloscope, the reactor was fixed, and the electrode gap in the reactor was adjusted to 1 mm. And pouring the prepared dye wastewater into a reactor, wherein the electrode is positioned at a gas-liquid interface, and the solution is submerged in the electrode within 5 mm. And electrifying, adjusting the scale of the autotransformer to 50V, starting a pulse power supply, generating plasma by adjusting discharge parameters, adjusting the discharge voltage to 12kV, continuously and stably discharging for 60min, then closing the pulse power supply, and cutting off an electrifying circuit.
And (3) pouring the dye wastewater treated by the plasma in the reactor into a beaker, naturally cooling, standing, performing suction filtration by using a 22-micron filter membrane, and washing by using deionized water to obtain a product. The washed product was then dried under vacuum at 80 ℃ for 12h, and the dried product was scraped off the filter to give a solid powdered carbon material, the SEM of which is shown in FIG. 4.
Example 4.
The dried carbon material obtained in examples 1-3 was used in an electrocatalytic hydrogen evolution reaction process, as follows:
the electrochemical properties of the materials were evaluated at an electrochemical workstation (AUTOLAB, USA) where graphite rods and Ag/AgCl were used as counter and reference electrodes, respectively, and the working electrode was catalyst-loaded nickel foam. Weighing 2mg of carbon material, finely grinding, dispersing in a mixed solution containing 500 mu L of ethanol, 500 mu L of ultrapure water and 30 mu L of Nafion, and carrying out ultrasonic treatment for 30min to obtain a uniformly dispersed suspension. 100 mu L of the suspension is uniformly dropped on 1X 1cm cleaned foamed nickel, and the foamed nickel is placed into a vacuum drying oven at 60 ℃ for drying for 12 hours. The electrocatalytic activity was determined at a scan rate of 5mV/s in a 1.0M KOH solution.
Specific performance figures are shown in figures 5-7 for HER catalytic process performance figures. As can be seen from the figure, the carbon material prepared by the technical scheme of the invention has better electro-catalytic hydrogen evolution performance.
The method for converting the dye wastewater into the carbon material and recycling the carbon material in the embodiments 1, 2 and 3 has the advantages of simple method, high production efficiency, simple process flow and low cost, and the prepared carbon material can be applied to the field of electrocatalysis.
Example 5.
The specific operation steps are as follows:
(1) 200mg of methyl orange is weighed, poured into a 500mL beaker, added with deionized water, and prepared into a 400mg/L methyl orange solution in a 500mL volumetric flask. And (3) adopting magnetic stirring, wherein the rotating speed of the magnetic stirring is 300r/min, the stirring time is 0.5 hour, and completely dissolving methyl orange in deionized water through the magnetic stirring to obtain the dye wastewater.
As shown in FIG. 1, a plasma generator (i.e., a pulse power supply) was connected to a reactor and an oscilloscope, the reactor was fixed, and the electrode gap in the reactor was adjusted to 1 mm. And pouring the prepared dye wastewater into a reactor, wherein the electrode is positioned at a gas-liquid interface, and the solution is submerged in the electrode within 5 mm. And electrifying, adjusting the scale of the autotransformer to 50V, starting a pulse power supply, generating plasma by adjusting discharge parameters, adjusting the discharge voltage to 8kV, continuously and stably discharging for 60min, then closing the pulse power supply, and cutting off an electrifying circuit.
And (3) pouring the dye wastewater treated by the plasma in the reactor into a beaker, naturally cooling and standing. And (3) carrying out suction filtration on the treated dye wastewater by using a 22-micron filter membrane, and finding that no filter residue is generated on the filter membrane.
In contrast to example 1, it is demonstrated that the selection of discharge voltage directly affects whether carbon material can be produced, and is one of the important factors for converting dye molecules in dye wastewater into carbon material.
(2) Increasing the discharge voltage
(2) The same procedure as in (1) is followed, except that the discharge voltage is increased to greater than 8 kV. After the operation was completed, the yield of the carbon material was measured.
Through experiments, as shown in fig. 8, when the discharge voltage is greater than 8kV, a carbon material can be generated; and the amount of the obtained carbon material is obviously increased along with the increase of the discharge voltage to 12 kV; however, after the discharge voltage was increased to more than 12kV, the amount of the obtained carbon material hardly increased any more in the same time. Therefore, in the technical scheme of the invention, the optimal discharge voltage parameter of the plasma treatment is 12 kV.
Example 6.
The specific operation steps are as follows:
200mg of methyl orange is weighed, poured into a 500mL beaker, added with deionized water, and prepared into a 500mL volumetric flask. And (3) adopting magnetic stirring, wherein the rotating speed of the magnetic stirring is 300r/min, the stirring time is 0.5 hour, and completely dissolving methyl orange in deionized water through the magnetic stirring to obtain the dye wastewater.
Connecting a plasma generating device (the power supply is an alternating current power supply) with the reactor and the oscilloscope, fixing the reactor, adjusting the electrode distance, and setting the electrode gap in the reactor to be 1 mm. And pouring the prepared dye wastewater into a reactor, wherein the electrode is positioned at a gas-liquid interface, and the solution is submerged in the electrode within 5 mm. Electrifying, adjusting discharge parameters to generate plasma, and finally finding that the alternating current power supply has no discharge phenomenon in the dye wastewater, cannot generate the plasma and does not generate carbon materials.
In contrast to example 1, it was demonstrated that the power source of the plasma treatment directly affects whether or not a carbon material can be produced.
Example 7.
The specific operation steps are as follows:
(1) 25mg of methyl orange is weighed, poured into a 500mL beaker, added with deionized water, and prepared into a methyl orange solution with the concentration of 50mg/L in a 500mL volumetric flask. And (3) adopting magnetic stirring, wherein the rotating speed of the magnetic stirring is 300r/min, the stirring time is 0.5 hour, and completely dissolving methyl orange in deionized water through the magnetic stirring to obtain the dye wastewater.
The plasma generating device (i.e. pulse power supply) is connected with the reactor and the oscilloscope, the reactor is fixed, the electrode distance is adjusted, and the electrode gap in the reactor is 1 mm. And pouring the prepared dye wastewater into a reactor, wherein the electrode is positioned at a gas-liquid interface, and the solution is submerged in the electrode within 5 mm. And electrifying, adjusting the scale of the autotransformer to 50V, starting a pulse power supply, generating plasma by adjusting discharge parameters, adjusting the discharge voltage to 8kV, continuously and stably discharging for 60min, then closing the pulse power supply, and cutting off an electrifying circuit.
And (3) pouring the dye wastewater treated by the plasma in the reactor into a beaker, naturally cooling and standing. And (3) carrying out suction filtration on the treated dye wastewater by using a 22-micron filter membrane, and finding that no filter residue is generated on the filter membrane.
In comparison with example 1, it was confirmed that the concentration of the solution influences whether or not the carbon material can be produced, and is one of the important factors for converting dye molecules in the dye wastewater into the carbon material.
(2) Increase the concentration
(2) The same operation as that in the step (1) is carried out, except that the concentration of the dye wastewater is increased to 50-1000 mg/L. After the operation was completed, the yield of the carbon material was measured.
As a result of the experiment, as shown in FIG. 9, a carbon material can be produced at a concentration of more than 50mg/L under the same discharge time; and the amount of the obtained carbon material is obviously increased along with the increase of the concentration of the dye wastewater to 400 mg/L; however, when the dye wastewater is increased to more than 400mg/L, the amount of the obtained carbon material is remarkably reduced. This is because the intermediate formed when the concentration is too high inhibits the formation of the carbon material, and this leads to a competitive relationship, which further affects the yield.
When the concentration is further increased, it is necessary to extend the discharge time in order to obtain the carbon material as much as possible, but the extended discharge time is not proportional to the increase in the concentration, and the extended discharge time is long, and the production efficiency is low. For example, when the concentration is increased to 1000mg/L, the pigment wastewater is faded after continuous discharge for 8h, and the degradation effect is achieved, but the yield of the carbon material is not remarkably increased.
Therefore, in the technical scheme of the invention, the optimal concentration of the dye wastewater is 400 mg/L.
Example 8.
The specific operation steps are as follows:
200mg of methyl orange is weighed, poured into a 500mL beaker, added with deionized water, and prepared into a 400mg/L methyl orange solution in a 500mL volumetric flask. And (3) adopting magnetic stirring, wherein the rotating speed of the magnetic stirring is 300r/min, the stirring time is 0.5 hour, and completely dissolving methyl orange in deionized water through the magnetic stirring to obtain the dye wastewater.
As shown in FIG. 1, a plasma generator (i.e., a pulse power supply) was connected to a reactor and an oscilloscope, the reactor was fixed, and the electrode gap in the reactor was adjusted to 1 mm. And pouring the prepared dye wastewater into a reactor, wherein the electrode is positioned at a gas-liquid interface, and the solution is submerged in the electrode within 5 mm. And electrifying, adjusting the scale of the autotransformer to 50V, starting a pulse power supply, generating plasma by adjusting discharge parameters, adjusting the discharge voltage to 12kV, continuously and stably discharging for 5min, then closing the pulse power supply, and cutting off an electrifying circuit.
And pouring the dye wastewater treated by the plasma in the reactor into a beaker, naturally cooling, standing, and performing suction filtration on the treated dye wastewater by using a 22-micron filter membrane to find that no filter residue is generated on the filter membrane.
In comparison with example 1, it was confirmed that the treatment time affects whether or not the carbon material can be produced, and is one of the important factors for converting dye molecules in the dye wastewater into the carbon material.
Example 9.
The specific operation steps are as follows:
200mg of methyl orange is weighed, poured into a 500mL beaker, added with deionized water, and prepared into a 400mg/L methyl orange solution in a 500mL volumetric flask. And (3) adopting magnetic stirring, wherein the rotating speed of the magnetic stirring is 300r/min, the stirring time is 0.5 hour, and completely dissolving methyl orange in deionized water through the magnetic stirring to obtain the dye wastewater.
As shown in FIG. 1, a plasma generator (i.e., a pulse power supply) was connected to a reactor and an oscilloscope, the reactor was fixed, and the electrode gap in the reactor was adjusted to 1 mm. Pouring the prepared dye wastewater into a reactor, enabling the liquid level of the solution to exceed the height of an electrode by 20mm, electrifying, adjusting the scale of an autotransformer to 50V, starting a pulse power supply, generating plasma by adjusting discharge parameters, adjusting the discharge voltage to 12kV, continuously and stably discharging for 60min, then closing the pulse power supply, and cutting off an electrifying circuit.
And pouring the dye wastewater treated by the plasma in the reactor into a beaker, naturally cooling, standing, and performing suction filtration on the treated dye wastewater by using a 22-micron filter membrane to find that no filter residue is generated on the filter membrane.
In comparison with example 1, it was confirmed whether the influence of the gas-liquid interface of the solution on the formation of the carbon material is one of the important factors for converting the dye molecules in the dye wastewater into the carbon material.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. A method for preparing a carbon material by taking dye wastewater as a raw material is characterized by comprising the following steps: and (3) carrying out plasma treatment on the dye wastewater, cooling, standing, carrying out suction filtration, and carrying out vacuum drying to obtain the solid powder carbon material.
2. The method of claim 1,
the plasma treatment comprises the following steps: placing the dye wastewater in a reactor, ensuring that an electrode is positioned at a gas-liquid interface, and adjusting the electrode gap in the reactor;
connecting the reactor and the oscilloscope with a power supply;
and switching on a power supply, and performing continuous stable discharge after plasma is generated by adjusting discharge parameters.
3. The method of claim 2,
the concentration of the dye wastewater is more than 50mg/L and not more than 1000 mg/L;
the voltage of the continuous discharge is more than 8 KV.
4. The method of claim 3,
the concentration of the dye wastewater is 200-600 mg/L;
the voltage of the continuous discharge is more than 8KV and not more than 20 KV.
5. The method of claim 4,
the concentration of the dye wastewater is 400 mg/L;
the voltage of the continuous discharge is 12 KV.
6. The method of claim 5,
the continuous discharge time is 60 min.
7. The method of claim 2,
the electrode gap in the reactor is 1mm, and the electrode is positioned in a gas-liquid interface and the solution submerges in the electrode by 5 mm.
8. The method of claim 2,
the power supply is a pulse power supply.
9. The method of claim 2,
the vacuum drying temperature is 80 ℃, and the duration is 12 hours.
10. The method of claim 1,
the dye in the dye wastewater is methyl orange, methylene blue or rhodamine B.
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