CN110115974B - Decolorizing material, preparation method and application thereof, and wastewater decolorizing method - Google Patents
Decolorizing material, preparation method and application thereof, and wastewater decolorizing method Download PDFInfo
- Publication number
- CN110115974B CN110115974B CN201910488058.8A CN201910488058A CN110115974B CN 110115974 B CN110115974 B CN 110115974B CN 201910488058 A CN201910488058 A CN 201910488058A CN 110115974 B CN110115974 B CN 110115974B
- Authority
- CN
- China
- Prior art keywords
- decolorizing
- temperature
- wastewater
- sludge
- dye
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0225—Compounds of Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt
- B01J20/0229—Compounds of Fe
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28009—Magnetic properties
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention belongs to the field of industrial wastewater treatment, and particularly relates to a decolorizing material, a preparation method and application thereof, and a wastewater decolorizing method. The preparation method of the decolorizing material comprises the following steps: (1) drying and dehydrating the sludge until the water content is below 3 wt%, wherein the sludge is generated after sewage is treated by adopting an iron-based flocculating agent, and the dried sludge is obtained; (2) grinding the dried sludge and sieving the ground sludge with a 100-mesh sieve, and carrying out pyrolysis reaction on undersize materials in an inert atmosphere, wherein the pyrolysis reaction is carried out in a mode that the temperature is increased from room temperature to 500-800 ℃ at a speed of below 30 ℃/min, and the temperature is subjected to constant-temperature reaction for 0.5-2 hours and then cooled to obtain pyrolysis residues; (3) and finely grinding the pyrolysis residue to the granularity of below 100 meshes, and then carrying out magnetic separation on the obtained finely ground product under the magnetic field intensity of 1500-5000 Oe. The decolorizing material provided by the invention has good decolorizing capability on direct acid-resistant scarlet 4BS dye, can be regenerated and recycled after the decolorizing material reaches saturated adsorption, and has good economic benefit and environmental benefit.
Description
Technical Field
The invention belongs to the field of industrial wastewater treatment, and particularly relates to a decolorizing material, a preparation method and application thereof, and a method for decolorizing acid-fast scarlet 4BS dye in wastewater.
Background
The dye brings bright and colorful colors and huge economic benefits to the life of people, and simultaneously generates a large amount of dye wastewater. The dye wastewater has the characteristics of high organic matter content, deep chromaticity, high chemical oxygen demand, large discharge amount and the like, can cause natural water body pollution when being directly discharged into an environmental water body, reduces the transparency of the water body due to the high content of the organic matter and harmful substances, causes water body hypoxia, influences the growth of aquatic organisms and microorganisms, and destroys a water body self-purification system. Therefore, the treatment of organic dye wastewater is always one of the hot spots and difficult problems of environmental pollution treatment.
The direct acid-resistant scarlet 4BS dye (4 BS for short) is used as a soluble disazo dye and is widely applied to printing and dyeing of split-glue fabrics. The complex aromatic structure of these disazo dyes is very stable due to the resonance and pi-conjugated bond characteristics, and how to realize the harmless treatment thereof has attracted much attention. Scholars at home and abroad make a great deal of research on effectively removing azo dye wastewater, and currently, mature methods include a physicochemical method, a biological method, an advanced oxidation method and the like.
For example, CN101759257A discloses a method for removing acid fast scarlet 4BS dye in water, which adopts a gas-liquid mixed discharge method to treat water containing acid fast scarlet 4BS dye, specifically: putting water containing direct acid-resistant scarlet 4BS dye into gas-liquid mixed discharge reactor at a discharge velocity of 0.50m3And introducing air at a flow rate of/h, placing the anode and the cathode of the high-voltage power supply in the water to be treated, switching on the high-voltage power supply, and starting high-voltage discharge between the anode and the cathode, wherein the peak value of the high-voltage discharge voltage is 5000-10000V, the peak value of the discharge current is 20-50 mA, the distance between discharge electrodes is 5-15 mm, and the discharge time is 3-18 min. However, the method can realize the rapid degradation of acid-fast scarlet 4BS dye in water to degrade the dye into carbon dioxide, water and simple organic matters, but has high cost. CN107876096A discloses AgFeGeSb2O9The application of the polyaniline composite porous nano catalytic material in removing organic matters (directly resisting scarlet, methyl orange and ciprofloxacin) in wastewater is realized by taking a xenon lamp as a light source, simultaneously adopting a magnetic stirring and oxygenation exposure mode and adopting AgFeGeSb2O in a closed lightproof environment9The polyaniline composite porous nano catalytic material is used as a catalyst to degrade organic pollutants in wastewater. However, AgFeGeSb2O9The preparation process of the polyaniline composite porous nano catalytic material is relatively complex and has high cost.
In summary, the existing methods usually use chemical methods to remove the direct acid-fast scarlet 4BS dye from the wastewater, and if the adsorption method can be used to remove the direct acid-fast scarlet 4BS dye from the wastewater, the removal is faster, less costly and more sensitive, so that the development of new and less costly decolorizing materials for direct acid-fast scarlet 4BS dye is urgent.
Disclosure of Invention
The invention aims to overcome the defects that the existing methods for removing the direct acid-resistant scarlet 4BS dye in the wastewater are basically chemical methods and have complex processes and high cost, and provides a decolorizing material with strong adsorption capacity for the direct acid-resistant scarlet 4BS dye in the wastewater, a preparation method and application thereof, and a method for decolorizing the direct acid-resistant scarlet 4BS dye in the wastewater, so that the direct acid-resistant scarlet 4BS dye in the wastewater can be adsorbed and removed by a physical adsorption method.
At present, most of the research on sludge carbonization focuses on reducing the sludge treatment cost, reducing the energy consumption, realizing sludge reduction and the like, and the research on resource utilization of residues obtained by sludge pyrolysis reduction is insufficient. After intensive research, the inventor of the invention finds that the water content in sludge generated after a sewage treatment plant adopts an iron-based flocculant for treatment is controlled at 3 wt%, the sludge is subjected to pyrolysis reaction under a specific condition (the temperature is increased from room temperature to 500-800 ℃ at a speed of below 30 ℃/min, and the constant temperature reaction is carried out for 0.5-2 h at the temperature), and then the sludge is subjected to magnetic separation under the magnetic field strength of 1500-5000 Oe after being finely ground, so that the obtained material has a good pore structure and rich decolorizing functional groups, and has very good cyclic regeneration decolorizing capability on acid-resistant scarlet 4BS dye in wastewater. Based on this, the present invention has been completed.
Specifically, the invention provides a preparation method of a decolorizing material, wherein the method comprises the following steps:
(1) drying and dehydrating sludge until the water content is below 3 wt%, wherein the sludge is generated after sewage is treated by an iron-based flocculant, and dried sludge is obtained;
(2) grinding the dried sludge and sieving the ground sludge with a 100-mesh sieve, and carrying out pyrolysis reaction on undersize materials in an inert atmosphere, wherein the pyrolysis reaction is carried out in a mode that the temperature is increased from room temperature to 500-800 ℃ at a speed of below 30 ℃/min, and the temperature is subjected to constant-temperature reaction for 0.5-2 hours and then is cooled to obtain pyrolysis residues;
(3) and finely grinding the pyrolysis residue to the granularity of below 100 meshes, and then carrying out magnetic separation on the obtained finely ground product under the magnetic field intensity of 1500-5000 Oe, wherein the obtained magnetic material is the decolorizing material.
Further, in the step (1), the drying and dehydrating temperature is below 90 ℃ and the drying and dehydrating time is 3-8 h. Among them, the temperature for drying and dewatering is preferably controlled to 90 ℃ or lower in order to avoid Fe in the sludge2+Is oxidized into Fe3+Good maintenance of Fe2+/Fe3+So that the decolorized material has a good decolorization effect.
Further, in the step (2), the temperature rise rate is 10-30 ℃/min.
Further, in the step (2), the temperature of the pyrolysis reaction is 550-650 ℃.
Further, in the step (2), the inert atmosphere is maintained by passing nitrogen through the system, and the flow rate of the nitrogen is 10-80 mL/min.
In the invention, the magnetic field intensity of the magnetic separation is 1500-5000 Oe, and when the magnetic field intensity is less than 1500Oe, the amount of the magnetically separated dehydration material is very small; when the magnetic field intensity is greater than 5000Oe, pyrolysis residue magnetization is easily caused, so that all material powder is magnetically attracted, and the separation of the adsorption materials cannot be realized.
The invention also provides the decolorizing material prepared by the method.
The invention also provides application of the decolorizing material in decolorizing acid-fast scarlet 4BS dye in wastewater.
The invention also provides a method for decoloring the direct acid-resistant scarlet 4BS dye in the wastewater, wherein the method comprises the steps of adding the decoloring material into the wastewater containing the direct acid-resistant scarlet 4BS dye, shaking and decoloring for 1-5 hours in a shaking table at the temperature of 25-45 ℃ and the rotating speed of 150-300 r/min, and then filtering by adopting a microporous filter membrane.
Further, the concentration of the direct acid-resistant scarlet 4BS dye in the wastewater is 20-120 mg/L.
Furthermore, the dosage of the decolorizing material is 0.04-0.08 g relative to 80mL of the wastewater.
Further, the pH value of the oscillation decoloring is 3-8.
In the present invention, the purpose of filtering with the microporous membrane is to separate the decolorized wastewater from the decolorized material, and therefore, the pore size of the microporous membrane is only required to ensure that the decolorized material is basically retained, which is known to those skilled in the art and will not be described herein.
Further, the method for decoloring the direct acid-resistant scarlet 4BS dye in the wastewater provided by the invention also comprises the following steps of regenerating the saturated and adsorbed decoloring material: drying the decoloration material subjected to saturated adsorption at 60-100 ℃ until the water content is below 1 wt%, then placing the decoloration material in a tubular furnace, introducing inert gas for protection, raising the temperature from room temperature to 500-800 ℃ at the speed of 5-15 ℃/min, reacting at the constant temperature for 0.5-2 h, cooling along with the furnace, and grinding until the granularity is smaller than 100 meshes to obtain the regenerated decoloration material.
The invention has the beneficial effects that: when the decolorizing material provided by the invention is used for decolorizing direct acid-resistant scarlet 4BS dye in wastewater, the decolorizing rate is high and can reach more than 90%, and the decolorizing material can be regenerated and recycled after reaching saturation adsorption, thereby having good economic benefit and environmental benefit. In addition, the preparation process of the decolorizing material provided by the invention is simple and the cost is low.
Drawings
FIG. 1 shows the effect of different amounts of decolorizing materials on the 4BS decolorization rate.
FIG. 2 is a graph showing the effect of different pH values on the decolorization rate of 4 BS.
FIG. 3 is a graph showing the effect of different adsorption times on the decolorization rate of 4BS at different concentrations.
FIG. 4 is a graph showing the effect of different adsorption temperatures on the decolorization rate of 4BS at different concentrations.
Detailed Description
The present invention will be described in detail below by way of examples.
In the following examples and comparative examples, the decolorization ratio was calculated according to formula (1) after measuring the absorbance using a colorimeter:
in the formula: eta-decolorization (%); a. the0-liquid absorbance before dehydration; a. the1-absorbance of the liquid after decolorization.
Example 1
(1) Drying and dehydrating sludge generated after a sewage treatment plant adopts an iron-based flocculant at 80 ℃ for 5 hours to obtain dried sludge with the water content of less than 3 wt%;
(2) grinding the dried sludge and sieving the dried sludge by a 100-mesh sieve, putting the undersize into a tubular pyrolysis furnace, introducing nitrogen at the flow rate of 10mL/min to ensure the inert atmosphere, then heating the temperature in the tubular pyrolysis furnace from room temperature to 600 ℃ at the speed of 30 ℃/min, carrying out constant-temperature reaction at 600 ℃ for 1h, and then cooling the furnace to obtain pyrolysis residues;
(3) and finely grinding the pyrolysis residue until the granularity is below 100 meshes, and then carrying out magnetic separation on the obtained finely ground product under the magnetic field strength of 1500Oe, wherein the selected material with magnetism is a decolorizing material which is marked as C1.
Example 2
(1) Drying and dehydrating sludge generated after a sewage treatment plant adopts an iron-based flocculant at 80 ℃ for 5 hours to obtain dried sludge with the water content of less than 3 wt%;
(2) grinding the dried sludge and sieving the dried sludge by a 100-mesh sieve, putting the undersize into a tubular pyrolysis furnace, introducing nitrogen at a flow rate of 80mL/min to ensure an inert atmosphere, then heating the temperature in the tubular pyrolysis furnace from room temperature to 800 ℃ at a speed of 10 ℃/min, reacting at the constant temperature of 800 ℃ for 0.5h, and cooling along with the furnace to obtain pyrolysis residues;
(3) and finely grinding the pyrolysis residue to the granularity of below 100 meshes, and then carrying out magnetic separation on the obtained finely ground product under the magnetic field strength of 5000Oe, wherein the selected material with magnetism is a decoloration material and is marked as C2.
Example 3
(1) Drying and dehydrating sludge generated after a sewage treatment plant adopts an iron-based flocculant at 80 ℃ for 5 hours to obtain dried sludge with the water content of less than 3 wt%;
(2) grinding the dried sludge and sieving the dried sludge by a 100-mesh sieve, putting the undersize into a tubular pyrolysis furnace, introducing nitrogen at a flow rate of 50mL/min to ensure an inert atmosphere, then heating the temperature in the tubular pyrolysis furnace from room temperature to 500 ℃ at a speed of 20 ℃/min, reacting at the constant temperature of 500 ℃ for 2 hours, and cooling along with the furnace to obtain pyrolysis residues;
(3) and finely grinding the pyrolysis residue to the granularity of below 100 meshes, and then carrying out magnetic separation on the obtained finely ground product under the magnetic field strength of 3000Oe, wherein the selected material with magnetism is a decoloration material and is marked as C3.
Comparative example 1
A decolorized material was prepared according to the method of example 1, except that in step (2), the pyrolysis temperature was 400 ℃ and the conditions were otherwise the same as in example 1, to provide a reference decolorized material, designated DC 1.
Comparative example 2
A decolorized material was prepared according to the method of example 1, except that, in step (2), the temperature increase rate was 50 ℃/min, and the remaining conditions were the same as in example 1, to obtain a reference decolorized material, designated DC 2.
Comparative example 3
A decolorizing material was prepared in accordance with the procedure of example 1, except that in step (3), no magnetic separation was performed, and the finely ground product was used directly as the reference decolorizing material, designated DC 3.
Test example 1: influence of the amount dosed
Preparing 80mL of 4BS solution with the concentration of 20mg/L, pH and the value of 6.5, respectively adding decolorizing materials C1 with different masses (8g, 4g, 2g, 0.8g, 0.4g, 0.16g, 0.08g, 0.04g, 0.02g and 0.01g), oscillating for 24h in a shaking table with the temperature of 25 ℃ and the rotating speed of 200r/min, then filtering by a microporous filter membrane, sampling, measuring the absorbance and calculating the decolorizing rate.
FIG. 1 shows the effect of different amounts of decolorizing materials on the 4BS decolorization rate. As can be seen from FIG. 1, the increase in the amount of adsorbent from 0.01g to 0.16g increased the decolorization rate for 4BS from 70.47% to 99.91%, and exhibited a first-come-first-last-slow law. When the adding amount of the decolorizing material is increased to 0.4g, the color degree of the 4BS dye solution of 20mg/L can be basically and completely removed, the decolorizing rate can reach 100 percent, and the stability is kept. From the results shown in fig. 1, it can be found that when the amount of the decolorizing material is 0.04g, the decolorizing rate reaches 98.64%, and the adsorption balance is basically achieved, at this time, the adsorption efficiency and the decolorizing rate are improved little by continuously increasing the amount of the decolorizing material, and the economic amount of the decolorizing material corresponding to 80mL of dye solution with the concentration of 20mg/L is 0.04 g.
Test example 2: effect of pH on decolorization ratio
Preparing 80mL of 4BS solution with the initial concentration of 20mg/L, respectively adjusting the pH value to 2-11, adding 0.04g of decolorizing material C1, oscillating for 24 hours in a shaking table with the temperature of 25 ℃ and the rotating speed of 200r/min, then filtering by using a microporous membrane, sampling, measuring the absorbance of the sample and calculating the decolorizing rate.
FIG. 2 is a graph showing the effect of different pH values on the decolorization rate of 4 BS. As can be seen from FIG. 2, the pH value has a small influence on 4BS, and the decoloring rate is higher in acidic, neutral and alkaline environments and is more than 97%. Therefore, the pH value has no obvious influence on the color of the 4BS absorbed and removed by the peat.
Test example 3: influence of adsorption time
Preparing 80mL of 4BS solutions with the concentrations of 20mg/L, 40mg/L, 60mg/L, 80mg/L, 100mg/L and 120mg/L respectively, placing the solutions in a conical flask, adjusting the pH value to 6.5, accurately weighing 0.04g of decolorizing material C1, adding the solutions respectively, oscillating in a water bath at a constant temperature of 25 ℃ and a rotation speed of 200r/min, extracting samples at intervals of 25min within 4h, measuring the absorbance of the samples and calculating the decolorizing rate.
FIG. 3 is a graph showing the effect of different adsorption times on the decolorization rate of 4BS at different concentrations. As can be seen from fig. 3, the decolorization rate of the decolorized material for 4BS generally shows an increasing trend with the increase of the adsorption time, and the adsorption equilibrium is substantially reached at 240 min; when the adsorption time is the same, the decolorization ratio of the decolorizing material to 4BS gradually decreases with increasing initial concentration.
Test example 4: influence of adsorption temperature
Preparing a series of 4BS solutions with the concentrations of 20mg/L, 40mg/L, 60mg/L, 80mg/L, 100mg/L and 120mg/L respectively, placing the solutions in 80mL conical flasks, adding 0.04g of sludge carbon decolorizing material C1 respectively, then oscillating the solutions at constant temperature of 25 ℃, 35 ℃ and 45 ℃ for 4 hours respectively, then filtering the solutions by using a microporous filter membrane, measuring the absorbance of the solutions and calculating the decolorizing rate.
FIG. 4 is a graph showing the effect of different adsorption temperatures (25 deg.C, 35 deg.C and 45 deg.C) on the decolorization rate of 4BS at different concentrations, where the abscissa C0Is an indication of the initial concentration. As can be seen from fig. 4, at the same temperature, the decolorization rate decreases continuously with increasing 4BS concentration; and when the concentration of the 4BS is kept unchanged, the decolorization rate of the sludge biochar on the 4BS is continuously improved in the process of increasing the adsorption temperature from 25 ℃ to 45 ℃. However, the increase in decolorization decreased with increasing temperature, indicating that when the temperature was higher, continued temperature increases were less effective in increasing decolorization.
Test example 5: influence of different decolorizing materials
Preparing 80mL of 4BS solution with the concentration of 20mg/L, pH and the value of 6.5, respectively adding 0.04g of decolorizing materials C1-C3 obtained in examples 1-3 and reference decolorizing materials DC 1-DC 3 obtained in comparative examples 1-3, oscillating for 4 hours in a shaking table with the temperature of 25 ℃ and the rotating speed of 200r/min, filtering by a microporous filter membrane, sampling, measuring the absorbance and calculating the decolorizing rate. And after the decolorizing material reaches saturated adsorption, placing the decolorizing material in a drying oven at 85 ℃ for drying until the water content is 0.5 wt%, then placing the decolorizing material in a tubular furnace, introducing nitrogen for protection, raising the temperature from 30 ℃ to 600 ℃ at the speed of 10 ℃/min, reacting at constant temperature for 1h, cooling along with the furnace, and then grinding until the granularity is smaller than 100 meshes to obtain the regenerated decolorizing material. Respectively adding 0.04g C1-C3 and DC 1-DC 3 regenerated decolorizing materials into 80mL 4BS solution with the concentration of 20mg/L, pH value of 6.5, oscillating for 4h in a shaking table with the temperature of 25 ℃ and the rotating speed of 200r/min, filtering by a microporous filter membrane, sampling, measuring the absorbance of the sample and calculating the decolorizing rate. The results obtained are shown in table 1.
TABLE 1
The results in table 1 show that the decolorizing material provided by the invention has good adsorption capacity for 4BS, can realize high-efficiency decolorization of wastewater containing 4BS, and still has good adsorption capacity for 4BS after regeneration, and has good regeneration cycle adsorption capacity.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (8)
1. A method for preparing a decolorizing material, comprising the steps of:
(1) drying and dehydrating the sludge until the water content is below 3 wt%, wherein the sludge is generated after sewage is treated by adopting an iron-based flocculant to obtain dried sludge, and the drying and dehydrating temperature is below 90 ℃ and the drying and dehydrating time is 3-8 h;
(2) grinding the dried sludge and sieving the ground sludge with a 100-mesh sieve, and carrying out pyrolysis reaction on undersize materials in an inert atmosphere, wherein the pyrolysis reaction is carried out in a mode that the temperature is increased from room temperature to 500-800 ℃ at a temperature increase rate of 10-30 ℃/min, and the dried sludge is cooled after being subjected to constant-temperature reaction for 0.5-2 hours at the temperature to obtain pyrolysis residues;
(3) and finely grinding the pyrolysis residue to the granularity of below 100 meshes, and then carrying out magnetic separation on the obtained finely ground product under the magnetic field intensity of 1500-5000 Oe, wherein the obtained magnetic material is the decolorizing material.
2. The method for preparing a decolorized material according to claim 1, wherein in step (2), the inert atmosphere is maintained by passing nitrogen gas through the system, and the flow rate of nitrogen gas is 10 to 80 mL/min.
3. A decolorized material produced by the method of any one of claims 1 to 2.
4. Use of the decolorizing material of claim 3 for decolorizing direct acid-fast scarlet 4BS dyes in wastewater.
5. A method for decoloring direct acid-resistant scarlet 4BS dye in wastewater, which is characterized by comprising the steps of adding the decoloring material as described in claim 3 into the wastewater containing the direct acid-resistant scarlet 4BS dye, shaking and decoloring for 1-5 hours in a shaking table at the temperature of 25-45 ℃ and the rotating speed of 150-300 r/min, and then filtering by using a microporous filter membrane.
6. The method for decoloring direct acid-fast scarlet 4BS dye in wastewater according to claim 5, wherein the concentration of the direct acid-fast scarlet 4BS dye in the wastewater is 20-120 mg/L; the amount of the decolorizing material is 0.04-0.08 g relative to 80mL of the wastewater.
7. The method for decoloring direct acid-resistant scarlet 4BS dye in wastewater according to claim 5 or 6, wherein the pH value of the shaking decoloring is 3-8.
8. The method for decolorizing the direct acid-fast scarlet 4BS dye in wastewater according to claim 5 or 6, characterized in that it further comprises regenerating the saturated adsorbed decolorizing material by: drying the decoloration material subjected to saturated adsorption at 60-100 ℃ until the water content is below 1 wt%, then placing the decoloration material in a tubular furnace, introducing inert gas for protection, raising the temperature from room temperature to 500-800 ℃ at the speed of 5-15 ℃/min, carrying out constant-temperature reaction at the temperature for 0.5-2 h, then cooling the decoloration material along with the furnace, and grinding the decoloration material until the granularity is smaller than 100 meshes to obtain the regenerated decoloration material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910488058.8A CN110115974B (en) | 2019-06-05 | 2019-06-05 | Decolorizing material, preparation method and application thereof, and wastewater decolorizing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910488058.8A CN110115974B (en) | 2019-06-05 | 2019-06-05 | Decolorizing material, preparation method and application thereof, and wastewater decolorizing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110115974A CN110115974A (en) | 2019-08-13 |
| CN110115974B true CN110115974B (en) | 2022-02-15 |
Family
ID=67523893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910488058.8A Active CN110115974B (en) | 2019-06-05 | 2019-06-05 | Decolorizing material, preparation method and application thereof, and wastewater decolorizing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110115974B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111943474B (en) * | 2020-06-12 | 2022-10-11 | 中国科学院城市环境研究所 | Method and device for graded utilization of livestock and poultry manure pyrolysis residues |
| CN112051315A (en) * | 2020-09-16 | 2020-12-08 | 合肥工业大学 | Preparation method and application of iron-containing carbon-based composite material based on dye chemical wastewater coagulated sludge |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874352A (en) * | 2015-05-19 | 2015-09-02 | 浙江工业大学 | Preparation method of energy-saving sludge-based adsorbent |
| CN109179626A (en) * | 2018-10-15 | 2019-01-11 | 南京师范大学 | A method of utilizing sulphadiazine in coagulation sludge activation persulfate degradation water |
| CN109529756A (en) * | 2019-01-16 | 2019-03-29 | 中国科学院城市环境研究所 | A kind of processing method of sludge base dephosphorization material and preparation method thereof and phosphorus-containing wastewater |
| CN109621897A (en) * | 2019-01-03 | 2019-04-16 | 中国科学院城市环境研究所 | The preparation method and its device and purposes of a kind of magnetic bio Carbon Materials |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070113736A1 (en) * | 2005-09-08 | 2007-05-24 | Research Foundation Of The City University Of New York | Catalytic adsorbents obtained from municipal sludges, industrial sludges, compost and tobacco waste and process for their production |
-
2019
- 2019-06-05 CN CN201910488058.8A patent/CN110115974B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874352A (en) * | 2015-05-19 | 2015-09-02 | 浙江工业大学 | Preparation method of energy-saving sludge-based adsorbent |
| CN109179626A (en) * | 2018-10-15 | 2019-01-11 | 南京师范大学 | A method of utilizing sulphadiazine in coagulation sludge activation persulfate degradation water |
| CN109621897A (en) * | 2019-01-03 | 2019-04-16 | 中国科学院城市环境研究所 | The preparation method and its device and purposes of a kind of magnetic bio Carbon Materials |
| CN109529756A (en) * | 2019-01-16 | 2019-03-29 | 中国科学院城市环境研究所 | A kind of processing method of sludge base dephosphorization material and preparation method thereof and phosphorus-containing wastewater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110115974A (en) | 2019-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11642649B2 (en) | Method for preparing biochar from phosphoric acid-modified Enteromorpha prolifera, and use of biochar in removal of cadmium | |
| CN110156120B (en) | Sewage treatment device and treatment method | |
| CN110115974B (en) | Decolorizing material, preparation method and application thereof, and wastewater decolorizing method | |
| CN110152639A (en) | The preparation method of modified aluminium oxide supports and the preparation method and application of supported bi-metallic oxide catalyst | |
| CN102963950A (en) | Method for treating printing and dyeing wastewater by steel slag | |
| CN107364942A (en) | It can be applied to hydro-thermal carbon composite, its preparation method and its application of class Fenton's reaction | |
| CN111617761B (en) | Magnetic sewage peat heterogeneous Fenton catalyst and preparation method thereof | |
| CN107416942A (en) | A kind of method of microwave radiation technology fast degradation waste water from dyestuff | |
| CN110540284B (en) | Photocatalytic coupling microorganism water body restoration device and preparation method of sponge carrier | |
| CN111266084A (en) | Porous aquatic plant-based biomass charcoal material and application thereof | |
| CN110683729A (en) | Sludge recycling method based on charcoal firing and application thereof | |
| CN112473733B (en) | Mo-Eu co-doped titanium dioxide/aluminum phosphate molecular sieve composite photocatalyst and application thereof | |
| CN113019323B (en) | Ultrasonic activated biochar and preparation method and application thereof | |
| CN112830567B (en) | Application of induced polyaniline loaded graphene modified electrode reactor and Congo red removing method | |
| CN105561917A (en) | Dye wastewater decoloring agent and preparation method and application thereof | |
| CN113318771A (en) | Magnetic nano carbon nitride photocatalyst capable of removing algae and preparation method thereof | |
| CN108940349A (en) | The method of carbonitride Z-type photochemical catalyst removal dyestuff contaminant is mixed using siliver chromate/sulphur | |
| CN104525097A (en) | Preparation method of Ce-Ni double-metal-loading sepiolite adsorption-catalyst | |
| CN115353189B (en) | Method for treating ciprofloxacin-containing wastewater by regulating and controlling dissolved oxygen | |
| CN111298761B (en) | Modified sepiolite adsorbent and preparation method and application thereof | |
| CN109896574B (en) | Carbon ferrite-titanium oxide multifunctional water purification material and preparation method thereof | |
| CN110540985B (en) | Photosynthetic bacterium carbon-loaded three-nitrogen-loaded four-nano material | |
| CN102671617B (en) | Preparation method of material for adsorption of non-biodegradable organic pollutant | |
| CN106362786A (en) | Preparation method of FeNi-N/Al2O3/C catalyst, catalyst and application thereof | |
| CN112723621B (en) | Co-Ce-Zr/gamma-Al for treating ciprofloxacin wastewater2O3Composite particle electrode and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |