CN106966480B - Method for improving capability of green synthesis of nano zero-valent iron in degradation of crystal violet dye wastewater and application of method - Google Patents
Method for improving capability of green synthesis of nano zero-valent iron in degradation of crystal violet dye wastewater and application of method Download PDFInfo
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Abstract
An application of a method for improving the capability of green synthesis of nano zero-valent iron for degrading crystal violet dye wastewater belongs to the fields of nano materials and improvement of dye wastewater treatment capability. The method is characterized in that the perilla seed extract is used as a stabilizer to prepare the nano zero-valent iron at room temperature, and the nano zero-valent iron is used for dye degradation in a suspension state. Meanwhile, the degradation process is carried out in a weak magnetic field environment, so that the degradation capability of the synthesized nano zero-valent iron on the dye wastewater is improved. The dose of the perilla seed-nano zero-valent iron suspension is 0.5-2.5g/L, and the concentration range is 50-1000 mg/L. The method improves the capability of degrading crystal violet wastewater by green synthesized nano zero-valent iron, is simple, rapid, green and environment-friendly, can achieve the purposes of decoloring, degrading and removing dye organic pollutants in a short time, and greatly improves the utilization capability of the green synthesized nano zero-valent iron.
Description
Technical Field
The invention belongs to a treatment method for improving the rapid reduction degradation capability of dye wastewater, and particularly relates to an application of improving the capability of green synthesized nano zero-valent iron in degrading crystal violet wastewater by using a weak magnetic field condition.
Background
For the nano zero-valent iron, two properties of agglomeration and stability need to be considered in the application process, and the naked nano zero-valent iron loses activity because the nano zero-valent iron is easy to agglomerate. Therefore, in order to reduce or prevent the agglomeration of the nano zero-valent iron, a stabilizer must be attached to the surface of the nano particles during the synthesis process to provide electron repulsion and steric stability to the nano particles, thereby reducing the agglomeration and adhesion of the nano zero-valent iron. However, the use of chemical reagents increases the synthesis cost and is harmful to the environment, so that the synthesis of the nano zero-valent iron by using green and pollution-free substances is significant, and the method for synthesizing the nano zero-valent iron by using the perilla seed extract to replace chemical substances such as PVP, CMC, THF and the like as the surface modifier is feasible. The patent publication No. CN104174870A is a patent applied by Gaoyeng et al, wherein it is mentioned that the method for synthesizing nano zero-valent iron and applying the nano zero-valent iron to the degradation of two reactive dyes of reactive brilliant red K-2G and reactive brilliant blue KN-R by using grape seed extract as surface modifier, the grape seed involved in the method is essentially different from the perilla seed used in the invention in structure composition, the preparation steps are obviously simplified, the application effect of the synthesized perilla seed-nano zero-valent iron is not influenced, and the method has obvious progress.
While the problem of the agglomeration of the nano zero-valent iron is solved by a green synthesis method, some problems are gradually paid attention to and need to be solved and improved in the application process. After the nano zero-valent iron is added into a system for degrading pollutants, the nano zero-valent iron can generate ferrous/ferric ions in the reaction process, the ferrous/ferric ions are combined with generated hydroxide radicals to generate iron (hydroxide) oxide, and the iron (hydroxide) oxide covers the surface of the nano zero-valent iron to form a passivation film. In practical application, the nano zero-valent iron is usually left after the pollutants are degraded, but the degradation capability of the remaining nano zero-valent iron on the pollutants is obviously weakened, which shows that the activity of the nano zero-valent iron is reduced and even completely disappears. Therefore, the solution of the passivation problem of nano zero-valent iron has become a focus of attention.
Generally, methods for solving the passivation problem of the nano zero-valent iron include a bimetallic system, acid washing, hydrogen or sodium borohydride reduction, an ultrasonic method, an electrochemical method and the like. However, these treatment methods have the defects of requiring the use of additional chemical agents, consuming additional electric energy, having high treatment requirements and the like, and restrict the application of these treatment methods and the efficient use of nano zero-valent iron. Considering that iron is a ferromagnetic substance, the physicochemical property of iron may be changed in a weak magnetic field, so that the magnetic field is added into the reaction system to improve the capability of the nano zero-valent iron to degrade pollutants. The magnetic field gradient force generated by the magnetic field tends to transfer paramagnetic ferrous ions on the surface of the nano zero-valent iron along the high magnetic field gradient to generate local galvanic current, and meanwhile, the electromagnetic force stimulates the migration of the ions, so that a passivation film covered on the surface of the nano zero-valent iron is broken, the corrosion of the nano zero-valent iron is accelerated, and more electrons generated in a system are used for degrading pollutants. As no additional chemical reagent is needed to be added and excessive energy is consumed under the magnetic field condition, the method is a rapid, convenient, green, environment-friendly and environment-friendly method for enhancing the utilization of the nano zero-valent iron, and therefore, the method has wide application significance in practice.
Meanwhile, triphenylmethane dye Crystal Violet (Crystal Violet) is a triphenylmethane dye, is a Crystal with metal luster or dark green crystalline powder in a green state when being solid, is a multi-benzene ring compound, and has a main structure that a central carbon atom is connected with three benzene rings. Crystal violet is widely used in cytology and bacteriology, is an excellent coloring agent, but because its color development is obvious, if discharge into the water can seriously influence the luminousness of water and threaten the growth of animals and plants in the water to cause environmental pollution and ecological destruction, simultaneously, crystal violet waste water COD is higher, and the biodegradability is poor, and the decoloration degree of difficulty is big, and effective degradation degree of difficulty is great, therefore triphenylmethane dye crystal violet waste water is urgent to need efficient degradation processing. The invention strengthens the degradation capability of the green synthesized nano zero-valent iron on the crystal violet dye by using the condition of a weak magnetic field, has low cost and good effect and has wider application significance.
The invention utilizes perilla seeds to synthesize nano zero-valent iron in a green way, utilizes the condition of a weak magnetic field under the condition of normal temperature, strengthens the degradation capability of the nano zero-valent iron on crystal violet dye, not only exploits the utilization range of green surface modifiers and reduces the synthesis cost of the nano zero-valent iron, but also utilizes the condition of the weak magnetic field to improve the degradation capability of the synthesized nano zero-valent iron on basic dye crystal violet dye wastewater, and has wide application prospect.
Disclosure of Invention
The invention belongs to a treatment method for improving the rapid reduction degradation capability of dye wastewater, and particularly relates to an application of improving the capability of green synthesized nano zero-valent iron in degrading crystal violet wastewater by using a weak magnetic field condition. The method for synthesizing the nano zero-valent iron in a green manner by using the perilla seeds for the first time and improving the capability of degrading crystal violet wastewater by green synthesis of the nano zero-valent iron by using a weak magnetic field condition for the first time is simple, rapid, green and environment-friendly, can achieve the purposes of decoloring, degrading and removing organic pollutants in dye in a short time, and greatly improves the utilization capability of synthesizing the nano zero-valent iron in a green manner.
The purpose of the invention is realized by the following technical scheme:
a method for improving the ability of degrading crystal violet wastewater by green synthesized nano zero-valent iron is characterized by comprising the following steps:
pulverizing sun-dried fructus Perillae, preparing fructus Perillae solution at 2g/L standard, performing ultrasound with ultrasonic power of 50W for 15min, filtering with filter paper (preferably medium-speed filter paper) to obtain fructus Perillae extractive solution, mixing with 0.1mol/L soluble divalent iron salt solution, wherein the weight percentage of fructus Perillae extractive solution in the two mixed solutions is 2%, and Fe is used2+:BH4 -Slowly adding a borohydride solution under the condition that the molar ratio is 1:2, and stirring until no bubbles are generated, thereby obtaining the perilla seed surface modified nano zero-valent iron (perilla seed-nano zero-valent iron) suspension. And in the environment of room temperature and a weak magnetic field, the perilla seed-nano zero-valent iron suspension is added into crystal violet dye wastewater, the dye wastewater is decolorized and degraded by oscillation, and under the condition that the crystal violet dye is completely degraded by the nano zero-valent iron, the crystal violet dye wastewater under the same conditions is repeatedly added until the nano zero-valent iron is consumed, so that the maximum degradation capability of the nano zero-valent iron is fully exerted.
The method for improving the ability of the green synthesized nano zero-valent iron to degrade crystal violet wastewater is characterized by comprising the following steps: the perilla seed-nano zero-valent iron is suspension, and the dosage of the suspension directly applied to decoloration and degradation of dye wastewater is 0.5-2.5 g/L.
The method for improving the ability of the green synthesized nano zero-valent iron to degrade crystal violet wastewater is characterized by comprising the following steps: the weak magnetic field condition is provided by a magnet, and the magnetic field intensity is 20-30 mT.
The method for improving the ability of the green synthesized nano zero-valent iron to degrade crystal violet wastewater is characterized by comprising the following steps: when the degradation rate of the crystal violet dye wastewater reaches more than 99 percent, adding the crystal violet dye wastewater under the same conditions again.
The method for improving the ability of the green synthesized nano zero-valent iron to degrade crystal violet wastewater is characterized by comprising the following steps: the pH value of the dye wastewater is 4-10, and the concentration of the dye is 50-1000 mg/L.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for improving the ability of green synthesis of nano zero-valent iron to degrade crystal violet wastewater optimizes the process of green synthesis of nano zero-valent iron by using perilla seeds, so that the perilla seeds-nano zero-valent iron with good effect can be prepared more quickly, conveniently and widely, the material selection range in the field of green synthesis is widened, the cost is low, and the method is environment-friendly.
2. The method for improving the capability of the green synthesized nano zero-valent iron for degrading the crystal violet wastewater, disclosed by the invention, has the advantages that the green synthesized nano zero-valent iron has higher capability of degrading the crystal violet dye wastewater, and the capability of the nano zero-valent iron for degrading the crystal violet dye wastewater can be greatly improved under the condition of a weak magnetic field.
3. According to the method for improving the capability of the green synthesized nano zero-valent iron for degrading the crystal violet wastewater, the degradation capability of the green synthesized nano zero-valent iron for degrading the crystal violet dye wastewater under two environments of a non-magnetic field and a weak magnetic field is compared under different reaction conditions, and the result shows that the capability of the green synthesized nano zero-valent iron for degrading the crystal violet dye wastewater under the weak magnetic field environment is 1.52-2.06 times that under the non-magnetic field environment.
Drawings
FIG. 1 is a comparison curve of the degradation capability of the synthesized nano zero-valent iron to the crystal violet dye in the wastewater in the environment without magnetic field and in the environment with weak magnetic field in example 1.
FIG. 2 is a comparison curve of the synthesized nano zero-valent iron on the degradation capability of crystal violet dye in wastewater in the environment without magnetic field and in the environment with weak magnetic field in example 2.
FIG. 3 is a comparison curve of the synthesized nano zero-valent iron on the degradation capability of the crystal violet dye in the wastewater in the environment without magnetic field and in the environment with weak magnetic field in example 3.
FIG. 4 is a comparison curve of the synthesized nano zero-valent iron on the degradation capability of the crystal violet dye in the wastewater in the environment without magnetic field and in the environment with weak magnetic field in example 4.
FIG. 5 is a comparison curve of the synthesized nano zero-valent iron on the degradation capability of the crystal violet dye in the wastewater in the environment without magnetic field and in the environment with weak magnetic field in example 5.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited to the examples.
Example 1
Sun-drying and air-drying fructus Perillae for 2 hr, pulverizing, preparing fructus Perillae solution at 2g/L standard, performing ultrasonic treatment at 50W for 15min, filtering with medium-speed filter paper to obtain fructus Perillae extractive solution, mixing with 100mL of 0.1mol/L soluble ferrous salt solution at 2 wt%, and mixing with Fe2+:BH4 -Slowly adding a borohydride solution under the condition that the molar ratio is 1:2, and stirring until no bubbles are generated, thereby obtaining the perilla seed surface modified nano zero-valent iron (perilla seed-nano zero-valent iron) suspension. Under the condition of room temperature, the perilla seed-nano zero-valent iron suspension is respectively added into 100mL of wastewater containing 500mg/L crystal violet dye under the conditions of no magnetic field and weak magnetic field in a dosage of 1.5g/L, the wastewater is shaken to decolor and degrade the dye wastewater, and under the condition that the nano zero-valent iron completely degrades the dye, the wastewater containing 500mg/L crystal violet dye is repeatedly added in a dosage of 100mL of wastewater containing 500mg/L crystal violet dye under the condition that the nano zero-valent iron completely degrades the dye until the nano zero-valent iron is completely consumed, so that the maximum degradation capability of the nano zero-valent iron is fully exerted.
In the embodiment, under a magnetic field-free environment, the nano zero-valent iron completes the reductive degradation of the crystal violet dye in the wastewater within 25min, and the degradation rate is 88.81%; in a weak magnetic field environment, the first degradation process of the nano zero-valent iron completes the reductive degradation of the crystal violet dye in the wastewater within 22.5min, the degradation rate is 99.39%, in the process of recycling, the 2 nd time utilization, the reductive degradation of the crystal violet dye in the wastewater is completed within 15min, the degradation rate is 53.10%, and the nano zero-valent iron loses the degradation capability. Treating the same crystal violet dye wastewater in terms of time, wherein the degradation rate of the crystal violet dye wastewater by the nano zero-valent iron under the environment without magnetic field and weak magnetic field is similar; however, in terms of the total degradation amount, the weak magnetic field environment can enable the nano zero-valent iron to degrade the crystal violet dye wastewater more thoroughly, the capacity of degrading and utilizing the crystal violet dye is improved for the second time, and the total degradation amount of the crystal violet dye is 1.72 times that of the crystal violet dye wastewater in the absence of a magnetic field.
FIG. 1 is a comparison curve of the synthesized nano zero-valent iron on the degradation capability of crystal violet dye in wastewater in the environment without magnetic field and weak magnetic field.
Example 2
Sun-drying and air-drying fructus Perillae for 2 hr, pulverizing, preparing fructus Perillae solution at 2g/L standard, performing ultrasonic treatment at 50W for 15min, filtering with medium-speed filter paper to obtain fructus Perillae extractive solution, mixing with 100mL of 0.1mol/L soluble ferrous salt solution at 2 wt%, and mixing with Fe2+:BH4 -Slowly adding a borohydride solution under the condition that the molar ratio is 1:2, and stirring until no bubbles are generated, thereby obtaining the perilla seed surface modified nano zero-valent iron (perilla seed-nano zero-valent iron) suspension. Under the condition of room temperature, the perilla seed-nano zero-valent iron suspension is respectively added into 100mL of wastewater containing 750mg/L crystal violet dye under the conditions of no magnetic field and weak magnetic field in a dosage of 2.0g/L, the wastewater is shaken to decolor and degrade the dye wastewater, and under the condition that the nano zero-valent iron completely degrades the dye, the wastewater containing 750mg/L crystal violet dye is repeatedly added in a dosage of 100mL of wastewater containing 750mg/L crystal violet dye under the condition that the nano zero-valent iron completely degrades the dye until the nano zero-valent iron is completely consumed, so that the maximum degradation capability of the nano zero-valent iron is fully exerted.
In the embodiment, under a magnetic field-free environment, the nano zero-valent iron completes the reduction degradation of the crystal violet dye in the wastewater within 27.5min, and the degradation rate is 86.06%; in a weak magnetic field environment, the first degradation process of the nano zero-valent iron completes the reductive degradation of the crystal violet dye in the wastewater within 27.5min, the degradation rate is 99.70%, in the process of recycling, the 2 nd time utilization, the reductive degradation of the crystal violet dye in the wastewater within 22.5min, the degradation rate is 53.89%, and the nano zero-valent iron loses the degradation capability. Treating the same crystal violet dye wastewater in terms of time, wherein the degradation rate of the crystal violet dye wastewater by the nano zero-valent iron under the environment without magnetic field and weak magnetic field is similar; however, in terms of total degradation amount, the low-intensity magnetic field environment can enable the nano zero-valent iron to degrade the crystal violet dye wastewater more thoroughly, the capacity of degrading and utilizing the crystal violet dye is improved for the second time, and the total amount of the degraded crystal violet dye is 1.78 times that of the crystal violet dye wastewater in the absence of a magnetic field.
FIG. 2 is a comparison curve of the synthesized nano zero-valent iron on the degradation capability of crystal violet dye in wastewater in the environment without magnetic field and weak magnetic field.
Example 3
Sun-drying and air-drying fructus Perillae for 2 hr, pulverizing, preparing fructus Perillae solution at 2g/L standard, performing ultrasonic treatment at 50W for 15min, filtering with medium-speed filter paper to obtain fructus Perillae extractive solution, mixing with 100mL of 0.1mol/L soluble ferrous salt solution at 2 wt%, and mixing with Fe2+:BH4 -Slowly adding a borohydride solution under the condition that the molar ratio is 1:2, and stirring until no bubbles are generated, thereby obtaining the perilla seed surface modified nano zero-valent iron (perilla seed-nano zero-valent iron) suspension. Under the condition of room temperature, the perilla seed-nano zero-valent iron suspension is respectively added into 100mL of wastewater containing 1000mg/L of crystal violet dye under the conditions of no magnetic field and weak magnetic field in a dosage of 2.5g/L, the wastewater is shaken to decolorize and degrade the dye wastewater, and under the condition that the nano zero-valent iron completely degrades the dye, the wastewater containing 1000mg/L of crystal violet dye is repeatedly added in 100mL of wastewater containing 100 mg/L of crystal violet dye under the condition that the nano zero-valent iron completely degrades the dye until the nano zero-valent iron is completely consumed, so that the maximum degradation capability of the nano zero-valent iron is fully exerted.
In the embodiment, under a magnetic field-free environment, the nano zero-valent iron completes the reductive degradation of the crystal violet dye in the wastewater within 30min, and the degradation rate is 85.45%; in a weak magnetic field environment, the first degradation process of the nano zero-valent iron completes the reductive degradation of the crystal violet dye in the wastewater within 30min, the degradation rate is 99.50%, in the recycling process, the 2 nd time utilization, the reductive degradation of the crystal violet dye in the wastewater is completed within 15min, the degradation rate is 30.56%, and the nano zero-valent iron loses the degradation capability. Treating the same crystal violet dye wastewater in terms of time, wherein the degradation rate of the crystal violet dye wastewater by the nano zero-valent iron under the environment without magnetic field and weak magnetic field is similar; however, in terms of the total degradation amount, the weak magnetic field environment can enable the nano zero-valent iron to degrade the crystal violet dye wastewater more thoroughly, the capacity of degrading and utilizing the crystal violet dye is improved for the second time, and the total degradation amount of the crystal violet dye is 1.52 times that of the crystal violet dye under the condition of no magnetic field.
FIG. 3 is a comparison curve of the synthesized nanoscale zero-valent iron on the degradation capability of crystal violet dye in wastewater in a non-magnetic field environment and a weak magnetic field environment.
Example 4
Sun-drying and air-drying fructus Perillae for 2 hr, pulverizing, preparing fructus Perillae solution at 2g/L standard, performing ultrasonic treatment at 50W for 15min, filtering with medium-speed filter paper to obtain fructus Perillae extractive solution, mixing with 100mL of 0.1mol/L soluble ferrous salt solution at 2 wt%, and mixing with Fe2+:BH4 -Slowly adding a borohydride solution under the condition that the molar ratio is 1:2, and stirring until no bubbles are generated, thereby obtaining the perilla seed surface modified nano zero-valent iron (perilla seed-nano zero-valent iron) suspension. Under the condition of room temperature, the perilla seed-nano zero-valent iron suspension is respectively added into 100mL of wastewater containing 50mg/L of crystal violet dye under the conditions of no magnetic field and weak magnetic field in a dosage of 0.5g/L, the wastewater is shaken to decolorize and degrade the dye wastewater, and under the condition that the nano zero-valent iron completely degrades the dye, the wastewater containing 50mg/L of crystal violet dye is repeatedly added in 100mL of wastewater containing 50mg/L of crystal violet dye under the condition that the nano zero-valent iron is completely degraded until the nano zero-valent iron is completely consumed, so that the maximum degradation capability of the nano zero-valent iron is fully exerted.
In the embodiment, under a magnetic field-free environment, the nano zero-valent iron completes the reductive degradation of the crystal violet dye in the wastewater within 25min, and the degradation rate is 99.17%; in the process of recycling, the degradation ability is lost in 17.5min at the 2 nd utilization, and the degradation rate is 21.25%. In a weak magnetic field environment, the first degradation process of the nano zero-valent iron completes the reductive degradation of the crystal violet dye in the wastewater within 15min, wherein the degradation rate is 99.39%, in the process of recycling, the reductive degradation of the crystal violet dye in the wastewater is completed within 20min when the nano zero-valent iron is used for the 2 nd time, the degradation rates are 99.29%, and in the process of recycling, the nano zero-valent iron loses the degradation capability within 20min, and the degradation rate is 25.81%. From the aspect of time, when the crystal violet dye wastewater with low concentration is treated, the degradation rate of the crystal violet dye wastewater by the nano zero-valent iron under the environment of a weak magnetic field is higher than that under the environment of a non-magnetic field, so that the degradation efficiency of the nano zero-valent iron is improved under the environment of the weak magnetic field. In addition, from the total degradation amount, the low-intensity magnetic field environment can enable the nano zero-valent iron to degrade the crystal violet dye wastewater more thoroughly, and the capacity of degrading more crystal violet dyes is also realized, the total degradation amount of the crystal violet dyes is 1.93 times that of the crystal violet dyes under the condition of no magnetic field, and the capacity of the nano zero-valent iron is improved.
FIG. 4 is a comparison curve of the synthesized nano zero-valent iron on the degradation capability of crystal violet dye in wastewater in the environment without magnetic field and weak magnetic field.
Example 5
Sun-drying and air-drying fructus Perillae for 2 hr, pulverizing, preparing fructus Perillae solution at 2g/L standard, performing ultrasonic treatment at 50W for 15min, filtering with medium-speed filter paper to obtain fructus Perillae extractive solution, mixing with 100mL of 0.1mol/L soluble ferrous salt solution at 2 wt%, and mixing with Fe2+:BH4 -Slowly adding a borohydride solution under the condition that the molar ratio is 1:2, and stirring until no bubbles are generated, thereby obtaining the perilla seed surface modified nano zero-valent iron (perilla seed-nano zero-valent iron) suspension. Under the condition of room temperature, the perilla seed-nano zero-valent iron suspension is respectively added into 100mL of wastewater containing 250mg/L crystal violet dye under the conditions of no magnetic field and weak magnetic field in a dosage of 1.0g/L, the wastewater is shaken to decolor and degrade the dye wastewater, and under the condition that the nano zero-valent iron completely degrades the dye, the wastewater containing 250mg/L crystal violet dye is repeatedly added in a dosage of 100mL of wastewater containing 100 mg/L crystal violet dye under the pH value of 10 until the nano zero-valent iron is completely consumed, so that the maximum degradation capability of the nano zero-valent iron is fully exerted.
In the embodiment, under a magnetic field-free environment, the nano zero-valent iron completes the reductive degradation of the crystal violet dye in the wastewater within 30min, and the degradation rate is 93.57%; in a weak magnetic field environment, the first degradation process of the nano zero-valent iron completes the reductive degradation of crystal violet dye in wastewater within 22.5min, the degradation rate is 99.23%, and in the process of recycling, the nano zero-valent iron loses the degradation capability within 27.5min when being used for the 2 nd time, and the degradation rate is 93.26%. From the aspect of time, when the crystal violet dye wastewater with low concentration is treated, the degradation rate of the crystal violet dye wastewater by the nano zero-valent iron under the environment of a weak magnetic field is higher than that under the environment of a non-magnetic field, so that the degradation efficiency of the nano zero-valent iron is improved under the environment of the weak magnetic field. In addition, from the total degradation amount, the low-intensity magnetic field environment can enable the nano zero-valent iron to degrade the crystal violet dye wastewater more thoroughly, and the capacity of degrading more crystal violet dyes is also realized, the total degradation amount of the crystal violet dyes is 2.06 times that of the crystal violet dyes under the condition of no magnetic field, and the capacity of the nano zero-valent iron is improved.
FIG. 5 is a comparison curve of the synthesized nano zero-valent iron on the degradation capability of crystal violet dye in wastewater in the environment without magnetic field and weak magnetic field.
Claims (6)
1. A method for improving the ability of degrading crystal violet wastewater by green synthesized nano zero-valent iron is characterized by comprising the following steps:
crushing sun-dried perilla seeds, preparing a perilla seed solution according to a standard of 2g/L, carrying out ultrasonic treatment, filtering by using filter paper to obtain a perilla seed extracting solution, mixing the perilla seed extracting solution with a soluble ferrous salt solution with the concentration of 0.1mol/L, wherein the mass percentage of the perilla seed extracting solution in the two mixed solutions is 2%, and Fe is used2+:BH4 -Slowly adding a borohydride solution under the condition that the molar ratio is 1:2, and stirring until no bubbles are generated, thereby obtaining the perilla seed surface modified nano zero-valent iron or a perilla seed-nano zero-valent iron suspension; the perilla seed-nano zero-valent iron suspension is added into crystal violet dye wastewater at room temperature in the environment of weak magnetic field, and is vibrated to decolor and degrade the dye wastewater, and the crystal violet dye is completely degraded by the nano zero-valent ironAnd then, repeatedly adding the crystal violet dye wastewater under the same conditions until the nano zero-valent iron is consumed, and fully exerting the maximum degradation capability of the nano zero-valent iron.
2. The method for improving the ability of green synthesized nano zero-valent iron to degrade crystal violet wastewater according to claim 1, wherein the method comprises the following steps: the perilla seed-nano zero-valent iron is suspension, and the dosage of the suspension directly applied to decoloration and degradation of dye wastewater is 0.5-2.5 g/L.
3. The method for improving the ability of green synthesized nano zero-valent iron to degrade crystal violet wastewater according to claim 1, wherein the method comprises the following steps: the weak magnetic field condition is provided by a magnet, and the magnetic field intensity is 20-30 mT.
4. The method for improving the ability of green synthesized nano zero-valent iron to degrade crystal violet wastewater according to claim 1, wherein the method comprises the following steps: when the degradation rate of the crystal violet dye wastewater reaches more than 99 percent, adding the crystal violet dye wastewater under the same conditions again for degradation.
5. The method for improving the ability of green synthesized nano zero-valent iron to degrade crystal violet wastewater according to claim 1, wherein the method comprises the following steps: the pH value of the dye wastewater is 4-10, and the concentration of the dye is 50-1000 mg/L.
6. The method for improving the ability of green synthesized nano zero-valent iron to degrade crystal violet wastewater according to claim 1, wherein the method comprises the following steps: the ultrasonic condition is ultrasonic for 15min under the condition that the ultrasonic power is 50W.
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