CN106966479B - Method for improving efficiency of green synthesis of nano zero-valent iron degradation of reactive brilliant blue dye wastewater and application of method - Google Patents
Method for improving efficiency of green synthesis of nano zero-valent iron degradation of reactive brilliant blue dye wastewater and application of method Download PDFInfo
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Abstract
A method for improving the efficiency of green synthesis of nano zero-valent iron for degrading reactive brilliant blue dye wastewater and application thereof belong to the fields of nano materials and improvement of dye wastewater treatment efficiency. Preparing nanometer zero-valent iron (perilla seed-nanometer zero-valent iron) by using perilla seed extract as stabilizer at room temperature, and using the nanometer zero-valent iron in a suspension state for dye degradation. Meanwhile, the degradation process is carried out in a weak magnetic field environment, so that the degradation efficiency of the synthesized nano zero-valent iron on the dye wastewater is improved. In the invention, the dose of the perilla seed-nano zero-valent iron suspension is 0.5-2.5g/L, the pH range of the dye wastewater degradation is 6-10, and the concentration range is 50-1000 mg/L. The method improves the efficiency of degrading the reactive brilliant blue wastewater by the green synthesized nano zero-valent iron, is simple, rapid, green and environment-friendly, can achieve the aims of decoloring, degrading and removing dye organic pollutants in a short time, and greatly improves the utilization efficiency of the green synthesized nano zero-valent iron.
Description
Technical Field
The invention belongs to a treatment method for improving the rapid reductive degradation efficiency of dye wastewater, and particularly relates to an application of improving the efficiency of green synthesis of nano zero-valent iron degradation active brilliant blue 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 preparation and application processes, 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 may be changed in a weak magnetic field, so that the magnetic field is added into the reaction system to improve the efficiency of the nano zero-valent iron in degrading 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, the anthraquinone dye has high chemical and photochemical stability and is difficult to naturally degrade after entering a water body, so that the chromaticity of a polluted water area is increased, the incident light quantity is influenced, the normal life activities of aquatic animals and plants are further influenced, and the ecological balance of the water body is damaged. More importantly, most of the dyes are toxic substances, have the 'three-cause' (namely carcinogenic, teratogenic and mutagenic) effect, and pose a great threat to the health of human beings and other organisms if the dye wastewater is not treated or is not treated to reach the standard and is discharged into the environment. Therefore, the anthraquinone dye wastewater needs to be treated efficiently, and although the grape seed extract is used as a surface modifier to synthesize the nano zero-valent iron and is applied to the degradation of the anthraquinone dye reactive brilliant blue KN-R in the patent with the publication number of CN104174870A, the method strengthens the degradation efficiency of the green synthesized nano zero-valent iron by using the weak magnetic field condition, and has the advantages of low cost, good effect and wider application significance.
The invention utilizes perilla seeds to synthesize the 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 efficiency of the nano zero-valent iron to the reactive brilliant blue KN-R dye, not only expands the utilization range of the green surface modifier and reduces the synthesis cost of the nano zero-valent iron, but also improves the degradation efficiency of the synthesized nano zero-valent iron to the anthraquinone reactive brilliant blue KN-R dye wastewater by utilizing the condition of the weak magnetic field, thereby having wide application prospect.
Disclosure of Invention
The invention belongs to a treatment method for improving the rapid reductive degradation efficiency of dye wastewater, and particularly relates to an application of improving the efficiency of green synthesis of nano zero-valent iron degradation active brilliant blue 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 efficiency of degrading the reactive brilliant blue wastewater by green synthesis of the nano zero-valent iron by using the weak magnetic field condition for the first time 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 efficiency of green synthesis of the nano zero-valent iron.
The purpose of the invention is realized by the following technical scheme:
a method for improving the efficiency of green synthesis of nano zero-valent iron degradation of reactive brilliant blue wastewater and application thereof are characterized by comprising the following steps:
pulverizing sun-dried fructus Perillae, preparing fructus Perillae solution at 2g/L, performing ultrasound preferably at 50W for 15min, filtering with 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 or a 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 the reactive brilliant blue KN-R dye wastewater, the dye wastewater is decolored and degraded by oscillation, and under the condition that the nano zero-valent iron completely degrades the dye, the reactive brilliant blue KN-R dye wastewater under the same condition is continuously 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 efficiency of green synthesis of the nano zero-valent iron degradation active brilliant blue wastewater is characterized by comprising the following steps of: 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 efficiency of green synthesis of the nano zero-valent iron degradation active brilliant blue wastewater is characterized by comprising the following steps of: the weak magnetic field condition is provided by a magnet, the magnetic field intensity is 20-30mT, and the decoloring and degradation reactions of the magnetic field are both carried out under the magnetic field condition.
The method for improving the efficiency of green synthesis of the nano zero-valent iron degradation active brilliant blue wastewater is characterized by comprising the following steps of: when the degradation rate of the reactive brilliant blue KN-R dye wastewater reaches more than 99 percent, the reactive brilliant blue KN-R dye wastewater under the same conditions is added again for degradation.
The method for improving the efficiency of green synthesis of the nano zero-valent iron degradation active brilliant blue wastewater is characterized by comprising the following steps of: the pH value of the dye wastewater is 6-10, 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 efficiency of green synthesis of the nano zero-valent iron degradation active brilliant blue wastewater optimizes the process of green synthesis of the nano zero-valent iron by using the 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 efficiency of green synthesis of nano zero-valent iron for degrading reactive brilliant blue dye wastewater provided by the invention has the advantages that the green synthesis of nano zero-valent iron has higher efficiency of degrading reactive brilliant blue dye wastewater, and the efficiency of degrading the reactive brilliant blue dye wastewater by the nano zero-valent iron can be greatly improved under the condition of a weak magnetic field.
3. The method for improving the efficiency of the green synthesis of the nano zero-valent iron for degrading the active brilliant blue wastewater comprises the steps of comparing the degradation efficiency of the green synthesis of the nano zero-valent iron to the active brilliant blue KN-R dye wastewater under two environments of a non-magnetic field and a weak magnetic field under different reaction conditions, and finding that the capacity of the green synthesis of the nano zero-valent iron under the environment of the weak magnetic field for degrading the active brilliant blue KN-R dye wastewater is 3.78-7.20 times that of the capacity of the green synthesis of the nano zero-valent iron under the environment of the non-magnetic field.
Drawings
FIG. 1 is a graph showing the comparison of the degradation efficiency of the reactive brilliant blue KN-R dye in wastewater by the synthesized nano zero-valent iron in the environment without magnetic field (N-WMF) and the environment with Weak Magnetic Field (WMF) in example 1.
FIG. 2 is a graph showing the comparison of the degradation efficiency of the reactive brilliant blue KN-R dye in wastewater by the synthesized nano zero-valent iron in the environment without magnetic field (N-WMF) and the environment with Weak Magnetic Field (WMF) in example 2.
FIG. 3 is a graph showing the comparison of the degradation efficiency of the reactive brilliant blue KN-R dye in wastewater by the synthesized nano zero-valent iron in the environment without magnetic field (N-WMF) and the environment with Weak Magnetic Field (WMF) in example 3.
FIG. 4 is a comparison curve of the degradation efficiency of the reactive brilliant blue KN-R dye in wastewater by the synthesized nano zero-valent iron in the environment without magnetic field (N-WMF) and the environment with Weak Magnetic Field (WMF) in example 4.
FIG. 5 is a graph showing the comparison of the degradation efficiency of the reactive brilliant blue KN-R dye in wastewater by the synthesized nano zero-valent iron in the environment without magnetic field (N-WMF) and the environment with Weak Magnetic Field (WMF) 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+:BH4Slowly adding a borohydride solution under the condition that the molar ratio of-to-be-mixed 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-nanometer zero-valent iron suspension is added into wastewater containing 500mg/L of reactive brilliant blue KN-R dye with the pH value of 6 and 100mL in a dosage of 1.0g/L under the conditions of no magnetic field and weak magnetic field respectively, the wastewater is shaken to decolor and degrade the dye wastewater, and under the condition that the nanometer zero-valent iron completely degrades the dye, the wastewater containing 500mg/L of reactive brilliant blue KN-R dye with the pH value of 6 and 100mL is repeatedly added until the nanometer zero-valent iron is completely consumed, so that the maximum degradation capability of the nanometer zero-valent iron is fully realized.
In the embodiment, under a magnetic field-free environment, the nanometer zero-valent iron completes the reduction degradation of the reactive brilliant blue KN-R dye in the wastewater within 15min, and the degradation efficiency is 86.03%; in a weak magnetic field environment, the first degradation process of the nano zero-valent iron completes the reductive degradation of the reactive brilliant blue KN-R dye in the wastewater within 10min, the degradation efficiency is 99.46%, in the process of recycling, when the nano zero-valent iron is used for 2-3 times, the reductive degradation of the reactive brilliant blue KN-R dye in the wastewater is completed at 12.5min and 15min respectively, the degradation rates respectively reach 99.8% and 99.25%, and when the nano zero-valent iron is used for 4 times, the activity of the nano zero-valent iron is completely lost, the degradation is stopped at 15min, and the degradation rate is only 63.27%. The same reactive brilliant blue KN-R dye wastewater is treated in time, the degradation rate of the nano zero-valent iron is accelerated in a weak magnetic field environment, and the capacity of the nano zero-valent iron for treating the reactive brilliant blue KN-R dye is 4.01 times that of the nano zero-valent iron in a non-magnetic field environment in the degradation total amount.
FIG. 1 is a comparison curve of the degradation efficiency of the synthesized nano zero-valent iron to the reactive brilliant blue KN-R dye in wastewater in the environment without magnetic field and in the environment with 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 wastewater containing 100mL of active brilliant blue KN-R dye with the pH value of 7 and 250mg/L under the conditions of no magnetic field and weak magnetic field by 0.5g/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 100mL of active brilliant blue KN-R dye with the pH value of 7 and 250mg/L is repeatedly added 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 nanometer zero-valent iron completes the reduction degradation of the reactive brilliant blue KN-R dye in the wastewater within 12.5min, and the degradation efficiency is 95.22%; in a weak magnetic field environment, the first degradation process of the nano zero-valent iron completes the reductive degradation of the reactive brilliant blue KN-R dye in the wastewater within 3min, the degradation efficiency is 100%, in the process of recycling, when the nano zero-valent iron is used for 2-6 times, the reductive degradation of the reactive brilliant blue KN-R dye in the wastewater is completed within 3min, 4min, 5min and 8min respectively, the degradation rate reaches 100%, and when the nano zero-valent iron is used for 7 times, the activity of the nano zero-valent iron is completely lost, the degradation is stopped within 12.5min, and the degradation rate is only 85.35%. The same reactive brilliant blue KN-R dye wastewater is treated in time, the degradation rate of the nano zero-valent iron is accelerated in a weak magnetic field environment, and the capacity of the nano zero-valent iron for treating the reactive brilliant blue KN-R dye is 7.20 times that of the nano zero-valent iron in a non-magnetic field environment in the total degradation amount.
FIG. 2 is a comparison curve of the degradation efficiency of the synthesized nano zero-valent iron to the reactive brilliant blue KN-R dye in wastewater in the environment without magnetic field and in the environment with 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 added into wastewater containing 50mg/L of reactive brilliant blue KN-R dye with the pH value of 8 and 100mL in a dosage of 1.5g/L under the conditions of no magnetic field and weak magnetic field respectively, 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 50mg/L of reactive brilliant blue KN-R dye with the pH value of 8 and 100mL is repeatedly added 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, in a magnetic field-free environment, the dye concentration is low and is easy to degrade, so that the nano zero-valent iron completes the reductive degradation of the reactive brilliant blue KN-R dye in the wastewater within 1.5, 3, 6 and 7min when being used for 1 to 4 times, the degradation efficiency is 100 percent, the nano zero-valent iron loses activity in 8min when being used for 5 times, and the degradation rate is 70.62 percent; in a weak magnetic field environment, the first degradation process of the nano zero-valent iron completes the reductive degradation of the reactive brilliant blue KN-R dye in the wastewater within 0.75min, the degradation efficiency is 100%, in the process of recycling, when the dye is used for 2-12 times, the 100% degradation of the reactive brilliant blue KN-R dye in the wastewater is completed within 5-15s, when the dye is used for 13-17 times, the 100% degradation rate is reached at 0.5, 1.5 and 2.5min, respectively, when the dye is used for 18 times, the activity of the nano zero-valent iron is completely lost, and the degradation is stopped at 4min, and the degradation rate is only 77.75%. The same reactive brilliant blue KN-R dye wastewater is treated in time, the degradation rate of the nano zero-valent iron is accelerated in a weak magnetic field environment, and the capacity of the nano zero-valent iron for treating the reactive brilliant blue KN-R dye is 3.78 times that of the nano zero-valent iron in a non-magnetic field environment in the total degradation amount.
FIG. 3 is a comparison curve of the degradation efficiency of the synthesized nano zero-valent iron to the reactive brilliant blue KN-R dye in wastewater in the environment without magnetic field and in the environment with weak magnetic field.
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. At room temperature, the perilla seed-nano zero-valent iron suspension is added into 100mL wastewater containing 750mg/L of reactive brilliant blue KN-R dye with pH of 9 in a dosage of 2g/L under the conditions of no magnetic field and weak magnetic field respectively, the wastewater is decolorized and degraded by shaking, and the dye wastewater is treated by stirringAnd under the condition that the nano zero-valent iron completely degrades the dye, repeatedly adding 100mL of wastewater containing 750mg/L of reactive brilliant blue KN-R dye with the pH value of 9 until the nano zero-valent iron is completely consumed, and fully exerting the maximum degradation capability of the nano zero-valent iron.
In the embodiment, under a magnetic field-free environment, the nanometer zero-valent iron completes the reduction degradation of the reactive brilliant blue KN-R dye in the wastewater within 15min, and the degradation efficiency is 66.35%; in a weak magnetic field environment, the first degradation process of the nano zero-valent iron completes the reductive degradation of the reactive brilliant blue KN-R dye in the wastewater within 7.5min, the degradation efficiency is 99.95%, in the process of recycling, when the nano zero-valent iron is used for the second time, the reductive degradation of the reactive brilliant blue KN-R dye in the wastewater is completed within 10min, the degradation rates all reach 100%, and when the nano zero-valent iron is used for the 3 rd time, the activity of the nano zero-valent iron is completely lost, the degradation is stopped within 15min, and the degradation rate is only 96.35%. The same reactive brilliant blue KN-R dye wastewater is treated in time, the degradation rate of the nano zero-valent iron is accelerated in the weak magnetic field environment, and the capacity of treating the reactive brilliant blue KN-R dye by the nano zero-valent iron in the weak magnetic field environment is 4.47 times that in the non-magnetic field environment in the total degradation amount.
FIG. 4 is a comparison curve of the degradation efficiency of the synthesized nano zero-valent iron to the reactive brilliant blue KN-R dye in wastewater in the environment without magnetic field and in the environment with 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. Adding the perilla seed-nano zero-valent iron suspension into 100mL of wastewater containing 1000mg/L of reactive brilliant blue KN-R dye with the pH value of 10 at the dosage of 2.5g/L under the conditions of room temperature and no magnetic field and low magnetic field respectively, and shakingAnd (3) decolorizing and degrading the dye wastewater, and repeatedly adding 100mL of wastewater containing 1000mg/L of reactive brilliant blue KN-R dye with the pH value of 10 until the nano zero-valent iron is consumed under the condition that the nano zero-valent iron completely degrades the dye, so as to fully exert the maximum degradation capability of the nano zero-valent iron.
In the embodiment, under a magnetic field-free environment, the nanometer zero-valent iron completes the reduction degradation of the reactive brilliant blue KN-R dye in the wastewater within 17.5min, and the degradation efficiency is 62.60 percent; in a weak magnetic field environment, the first degradation process of the nano zero-valent iron completes the reductive degradation of the reactive brilliant blue KN-R dye in the wastewater within 15min, the degradation efficiency is 100%, in the process of recycling, when the nano zero-valent iron is used for the 2 nd time, the reductive degradation of the reactive brilliant blue KN-R dye in the wastewater is completed within 15min, the degradation rates reach 100%, and when the nano zero-valent iron is used for the 3 rd time, the activity of the nano zero-valent iron is completely lost, the degradation is stopped within 15min, and the degradation rate is only 77.57%. The same reactive brilliant blue KN-R dye wastewater is treated in time, the degradation rate of the nano zero-valent iron is accelerated in the weak magnetic field environment, and the capacity of treating the reactive brilliant blue KN-R dye by the nano zero-valent iron in the weak magnetic field environment is 4.43 times that in the non-magnetic field environment in the total degradation amount.
FIG. 5 is a comparison curve of the degradation efficiency of the synthesized nano zero-valent iron to the reactive brilliant blue KN-R dye in wastewater in the environment without magnetic field and in the environment with weak magnetic field.
Claims (6)
1. A method for improving the efficiency of green synthesis of nano zero-valent iron degradation active brilliant blue wastewater 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 medium-speed 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 borohydride solution under the condition that the molar ratio is 1:2, stirring until no bubbles are generated, and obtaining the perilla seed surface modified nano zero-valent iron or perilla seed-nano zero-valent ironAn 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 the reactive brilliant blue KN-R dye wastewater, the dye wastewater is decolored and degraded by oscillation, and under the condition that the nano zero-valent iron completely degrades the dye, the reactive brilliant blue KN-R dye wastewater under the same condition is continuously added until the nano zero-valent iron is consumed, so that the maximum degradation capability of the nano zero-valent iron is fully exerted.
2. The method for improving the efficiency of green synthesis of nano zero-valent iron degradation of reactive brilliant blue wastewater as claimed in 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 efficiency of green synthesis of nano zero-valent iron degradation of reactive brilliant blue wastewater as claimed in 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 efficiency of green synthesis of nano zero-valent iron degradation of reactive brilliant blue wastewater as claimed in claim 1, wherein the method comprises the following steps: when the degradation rate of the reactive brilliant blue KN-R dye wastewater reaches more than 99 percent, the reactive brilliant blue KN-R dye wastewater under the same conditions is added again for degradation.
5. The method for improving the efficiency of green synthesis of nano zero-valent iron degradation of reactive brilliant blue wastewater as claimed in claim 1, wherein the method comprises the following steps: the pH value of the dye wastewater is 6-10, and the concentration of the dye is 50-1000 mg/L.
6. The method for improving the efficiency of green synthesis of nano zero-valent iron degradation of reactive brilliant blue wastewater as claimed in 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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