CN113860471A - Method for degrading methylene blue-containing wastewater by catalytic ozonation of modified attapulgite - Google Patents
Method for degrading methylene blue-containing wastewater by catalytic ozonation of modified attapulgite Download PDFInfo
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- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 229960000907 methylthioninium chloride Drugs 0.000 title claims abstract description 99
- 229960000892 attapulgite Drugs 0.000 title claims abstract description 93
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F2101/36—Organic compounds containing halogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
- C02F2101/40—Organic compounds containing sulfur
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention provides a method for degrading methylene blue-containing wastewater by catalytic ozonation of modified attapulgite. The invention uses Fe (NO)3)3The modified attapulgite is combined with ozone to catalyze and promote the degradation of the wastewater containing methylene blue. According to the invention, the stirring speed is preferably 450r/min, the catalysis temperature is 50 ℃, the ratio of the flow rate of the modified attapulgite to the flow rate of ozone is preferably 5-6L/min per 0.3g of modified attapulgite, and the synergistic effect of the two is better. The method for treating the wastewater containing the methylene blue, provided by the invention, has the characteristics of practicality, convenience and high efficiency, and is suitable for wide application.
Description
Technical Field
The invention belongs to the technical field of printing and dyeing wastewater, and particularly relates to a method for degrading wastewater containing methylene blue by catalytic ozonation of modified attapulgite.
Background
The printing and dyeing wastewater is the main industrial wastewater which is difficult to treat and has great harm to the environment at present in China, and about 1.16 multiplied by 10 is discharged in China every year9m3The waste water from textile industry, paper industry, plastics industry, cosmetics industry and leather industry.
Printing and dyeing waste water has that the water yield is big, quality of water is complicated changeable, BOD and COD are all high, pH value changes greatly, demonstrate characteristics such as multiple colour, even concentration is very low, also can cause the water luminousness to reduce in a large number, the photosynthesis of aquatic organism receives the influence, the passive plant of poisonous and harmful pollutant absorbs the back, is difficult for discharging, causes huge threat to the existence of animals and plants, dyestuff waste water can also lead to skin irritation, allergic dermatitis, cancer and variation, causes serious threat to human health.
Methylene Blue (MB) is an organic pollutant widely existing in printing and dyeing wastewater, mainly appearing as a dye, and the demand for such substances is rising due to rapid development of the clothing industry, so that the treatment of such dyes in society is an inevitable trend.
The attapulgite is a layer chain magnesium aluminum silicate clay mineral which is called king of thousand soil and universal soil, has a special fibrous crystal form, has multiple pore channels inside, large specific surface area and good adsorption performance. Compared with activated carbon, the attapulgite is not only cheap, but also has higher chemical and mechanical stability, so the application and development of the attapulgite in environmental protection are concerned by people.
O3The antioxidant is a strong oxidant without pollution, and is favored by researchers in various fields. Therefore, the modified attapulgite catalytic ozonization technology is applied to MB degradationThe field can open a road with wide development space.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made keeping in mind the above problems occurring in the prior art.
Therefore, the invention aims to provide a method for degrading wastewater containing methylene blue by catalytic ozonation of modified attapulgite.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions: a method for degrading methylene blue-containing wastewater by catalytic ozonation of modified attapulgite is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
and heating the wastewater containing methylene blue under stirring, adding the modified attapulgite, introducing ozone into the wastewater, and reacting at constant temperature.
As a preferable scheme of the method for degrading the wastewater containing the methylene blue by the catalytic ozonation of the modified attapulgite, the method comprises the following steps: and heating under stirring, wherein the heating is oil bath heating, and the reaction temperature is controlled to be 40-60 ℃.
As a preferable scheme of the method for degrading the wastewater containing the methylene blue by the catalytic ozonation of the modified attapulgite, the method comprises the following steps: the stirring speed is 350-550 r/min.
As a preferable scheme of the method for degrading the wastewater containing the methylene blue by the catalytic ozonation of the modified attapulgite, the method comprises the following steps: the preparation process of the modified attapulgite comprises the following steps,
soaking 10g of 200 mesh original attapulgite in 100ml of 10% dilute hydrochloric acid for 6 hr, washing with water, vacuum filtering to neutrality, oven drying with bellows for 4 hr, and adding 0.5mol/L Fe (NO)3)3Soaking for 12 hr, washing with water, vacuum filtering to neutral, and blowingOven drying for 8 hr; then calcining for 6 hours at 450 ℃ by using a tube furnace, collecting in a plastic package bag after the calcination is finished and cooling, and storing in a dryer.
As a preferable scheme of the preparation process of the modified attapulgite of the invention, the method comprises the following steps: the original attapulgite has a standard chemical formula of Mg5Si8O20(HO)2(OH2)4·4H2O, chemical composition is SiO2、MgO、Al2O3Mainly comprises the following steps.
As a preferable scheme of the method for degrading the wastewater containing the methylene blue by the catalytic ozonation of the modified attapulgite, the method comprises the following steps: 0.1-0.4 g of modified attapulgite is added into every 50mg/L of methylene blue wastewater.
As a preferable scheme of the method for degrading the wastewater containing the methylene blue by the catalytic ozonation of the modified attapulgite, the method comprises the following steps: and introducing ozone, wherein the ozone flow is configured to be 5-6L/min for every 0.3g of modified attapulgite.
As a preferable scheme of the method for degrading the wastewater containing the methylene blue by the catalytic ozonation of the modified attapulgite, the method comprises the following steps: the constant temperature reaction is a reaction in which the temperature is maintained at 50-55 ℃.
The invention has the beneficial effects that:
the invention provides a method for degrading methylene blue-containing wastewater by catalytic ozonation of modified attapulgite. The invention adopts Fe (NO)3)3The modified attapulgite is combined with ozone to catalyze and promote the degradation of the wastewater containing methylene blue. According to the invention, the stirring speed is preferably 450r/min, the catalysis temperature is 50 ℃, the ratio of the flow rate of the modified attapulgite to the flow rate of ozone is preferably 5-6L/min per 0.3g of modified attapulgite, and the synergistic effect of the two is better.
The method for treating the wastewater containing the methylene blue, provided by the invention, has the characteristics of practicality, convenience and high efficiency, and is suitable for wide application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a diagram of an experimental setup; wherein, the device comprises 1-an ozone generator, 2-a colloid sampler, 3-a spherical condenser, 4-a thermometer, 5-a tail gas recovery cup, 6-a four-neck flask, 7-a magnetic stirring heater and 8-a stirring rotor;
FIG. 2 is a methylene blue standard curve;
FIG. 3 is a graph showing the influence of the stirring speed on the MB degradation rate;
FIG. 4 is a graph of the effect of ozone on MB degradation rate;
FIG. 5 is a graph of the effect of different ozone flow rates on MB degradation rate;
FIG. 6 is a graph showing the effect of attapulgite on MB degradation rate;
FIG. 7 is a graph showing the effect of different amounts of modified attapulgite on the MB degradation rate;
FIG. 8 is a graph showing the effect of reaction temperature on MB degradation rate.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention relates to a method for qualitatively and quantitatively analyzing a substance to be measured by measuring the absorbance or the luminous intensity of the substance at a specific wavelength or within a certain wavelength range, using a spectrophotometric method as an analysis method of the MB concentration. The method comprises the following specific steps:
A＝abc
wherein A is absorbance, b is solution thickness, c is solution concentration, a is absorption coefficient, when a and b values are constant, the absorbance A and the solution concentration c are in a linear relation, and the solution concentration can be obtained by measuring absorbance and checking a working curve. In the experiment, the absorbance of the MB solution is measured in a spectrophotometer, and the concentration of the MB is obtained through a standard curve.
The MB standard curve is plotted as follows: the determination of the methylene blue is directly determined by adopting a spectrophotometry method, 0.2500g of the methylene blue is accurately weighed and placed in a 250mL volumetric flask, and deionized water is used for constant volume until the volume reaches the scale mark, so that methylene blue stock solution (1000mg/L) is obtained. Accurately transferring 10mL of standard stock solution into a 100mL volumetric flask for constant volume to obtain methylene blue standard solution (100mg/L), and adding 0.50mL (1mg/L), 1.00mL (2mg/L), 2.00mL (4mg/L) and 3.00mL of 6 50mL volumetric flasks respectively
(6mg/L), 4.00mL (8mg/L) and 5.00mL (10mg/L) of methylene blue standard solution, diluted to the mark with deionized water and shaken up. The absorbance of the sample was measured at a wavelength of 664nm using a 1cm quartz cuvette with deionized water as a reference. The MB standard curve is obtained as shown in fig. 2. Obtaining an MB standard curve as shown in formula 2-1:
C＝6.0569×Abs-0.4662
linear correlation coefficient R2Measure MB concentration range 0.9972: 1mg/L-10 mg/L.
In the formula: c, the concentration of methylene blue in the sample solution is mg/L; abs-absorbance value of sample solution; the linear correlation coefficient R2 was greater than 0.995, indicating a good linear relationship and that it can be used for the determination of MB concentration.
The sample solution was diluted to the appropriate concentration and samples were taken for absorbance determination at 664 nm. The MB removal rate was calculated using the following formula:
in the formula: c0Initial methylene blue concentration, mg/L; ct-concentration of methylene blue, mg/L, over time t; x1-removal of methylene blue,%.
Since the preparation method is an equivalent-volume impregnation method, the amount of metal added is constant and cannot be used as a variable. The preparation method of the modified attapulgite comprises the following steps:
sieving to obtain 10g of original attapulgite with a particle size of 200 meshes, soaking in 100ml of 10% diluted hydrochloric acid for 6 hours, washing with water, vacuum filtering to neutrality, drying with air box, and adding 0.5mol/L Fe (NO)3)3Soaking for 12h, washing with water, vacuum filtering to neutrality, and drying with bellows. Then calcining for 6 hours at 450 ℃ by using a tube furnace, collecting in a plastic package bag after the calcination is finished and cooling, and storing in a dryer.
The reagents used in the embodiment of the invention are analytically pure unless specified otherwise; the original attapulgite is purchased from Xuyi county of Jiangsu, China Attapulgite Clay Co., Ltd, and has standard chemical formula of Mg5Si8O20(HO)2(OH2)4·4H2O, chemical composition is SiO2、MgO、Al2O3Mainly comprises the following steps.
Example 1:
influence of stirring speed on adsorption:
the curve of the degradation rate of MB along with the time change under the conditions that the ozone flow is 5L/min, the temperature is 45 ℃, the concentration of the MB solution is 50mg/L, 0.3g of the modified attapulgite is taken, and the rotating speeds are 350r/min, 450r/min and 550r/min respectively is shown in figure 3.
As can be seen from fig. 3, under certain conditions, the degradation rate of MB increases with increasing rotation speed, and it is seen that rotation speed has a certain promoting effect on the oxidative degradation of MB. When the rotating speed exceeds 450r/min, the influence of the rotating speed on the degradation change of the MB is not large. Within a certain rotating speed range, along with the increase of the rotating speed, the vibration mixing degree of the water body is increased, thereby promoting the O3In waterThe dissolution and mass transfer of (2) accelerate the generation of. OH, and the yield of. OH increases with the increase of the rotation speed, so the oxidative degradation rate of MB will be improved. When the rotation speed exceeds a certain value, O3The dissolution in water has reached saturation and its effect on the degradation changes of MB is negligible.
Example 2:
influence of ozone flow:
the temperature is 45 ℃, the rotating speed is 550r/min, the initial MB concentration is 50mg/L, the modified attapulgite clay is 0.3g, the ozone flow is respectively 4L/min, 5L/min, 6L/min and 7L/min, the degradation effect of the original attapulgite clay and the modified attapulgite clay is studied under the ozone flow of 0L/min, and the degradation rate of the original attapulgite clay and the modified attapulgite clay changes along with time, and the curves are shown in figure 4 and figure 5.
As can be seen from fig. 4, when the ozone flux is 0L/min, it can be seen that the MB degradation rate of the modified attapulgite is higher than that of the original attapulgite, and the degradation rate is obviously improved after ozone is introduced, which indicates that the ozone and the modified attapulgite have a synergistic effect to mutually promote the degradation of MB. The attapulgite is modified through the steps of drying, roasting, acid treatment and the like, so that the crystal water in the attapulgite is evaporated, impurities in the attapulgite are removed, more pores are generated in the attapulgite, the specific surface area of the attapulgite is increased, the pore volume of the attapulgite is increased, the modified attapulgite has better adsorption performance, and the MB solution degradation rate is higher.
As can be seen from FIG. 5, when the ozone flow rate is less than 5L/min, the degradation rate of MB increases with the increase of the ozone flow rate; when the ozone flow is more than 6L/min, the degradation rate of MB is reduced along with the increase of the ozone flow; when the ozone flow is 5-6L/min, the change of the ozone flow has little influence on the degradation change of the MB, and the degradation effect of the MB is optimal. Therefore, when the ozone flow is 5-6L/min, the ozone can generate the optimal high efficiency with 0.3g of modified attapulgite.
During the reaction process, the content of ozone in the solution is affected by the dissolution, reaction and decomposition of ozone. In a certain ozone flow range, along with the increase of the ozone flow, the dissolution rate of ozone in water is increased, and the yield of OH is also increased, so that MB is degraded more quickly; however, for a reaction system with a certain volume, the solubility of ozone in the solution is certain, and when the ozone reaches a saturated state in the solution, the amount of ozone is excessive for the reaction system, so that the influence of the amount of ozone on the reaction can be not considered under the condition; when the ozone flow exceeds a certain value, a large amount of excessive ozone participates in the quenching reaction of OH, see formula 3-1, so that the amount of OH participating in the reaction is reduced, and the degradation change of MB is influenced.
2·OH+O3→H2O+2O2
When the ozone flow is determined, the value of the ozone flow is determined to be between 5 and 6L/min. An ozone flow rate within this range ensures that the solubility of ozone in water is so high that its concentration can be regarded as a constant; in addition, the gas-liquid mass transfer factor is eliminated, so that the reaction system is reaction control and non-mass transfer control. In order to maximize the MB degradation rate, the ozone flow rate was selected to be 6L/min. If used in an industrial process, the economics of ozone removal MB per unit need to be evaluated to determine the optimal ozone flow.
Example 3:
influence of attapulgite dosage on MB degradation rate:
under the conditions that the reaction temperature is 45 ℃, the rotating speed is 550r/min, the ozone flux is 6L/min, the initial concentration of the MB solution is 50mg/L, the dosage of the modified attapulgite is 0g, 0.1g, 0.2g, 0.3g and 0.4g respectively, and the original attapulgite is 0.4g, the curves of the degradation rate of the MB along with the change of time are shown in figures 6 and 7.
As can be seen from FIG. 6, when no attapulgite was added, MB in the reaction system was slightly degraded, and since ozone had a stronger electrophilicity, the redox potential was much higher than that of Cl2、H2O2、O2High, its oxidability is extremely strong, MB reacts with ozone directly, but the reaction rate is slower without the existence of catalyst. When the original attapulgite consumption is 0.4g and compared with the original attapulgite not added, the MB degradation rate is slightly higher, which shows that the attapulgite has certain catalytic activity and plays a catalytic role in the reaction process; adding 0.4g of original attapulgite and modified attapulgiteCompared with attapulgite, the latter has higher degradation rate, and the modified attapulgite is loaded with Fe (NO)3)3The catalyst has better catalytic performance, and plays a role in catalyzing the reaction process of oxidizing MB by ozone, so the reaction rate is greatly improved.
It can be seen from fig. 7 that when the attapulgite clay amount is less than 0.3g, the degradation rate and degradation rate of MB increase with the increase of the attapulgite clay amount, which shows that the attapulgite clay amount has direct influence on the oxidative degradation effect of MB, when the attapulgite clay amount is greater than or equal to 0.3g, the degradation rate and degradation rate change little, and when the attapulgite clay amount is continuously increased, the influence on the degradation change of MB can be ignored. Under the condition that the MB concentration is 50mg/L, when the dosage of the attapulgite is less than 0.3g, the dosage of the catalyst in the solution is not excessive, the catalytic efficiency is improved along with the increase of the dosage of the catalyst, the conversion rate of the monomer is promoted to be improved, and O is3More OH is produced in the water, the reaction of OH with MB is accelerated; meanwhile, the added attapulgite also adsorbs more MB in the solution, so that the degradation rate is improved along with the increase of the using amount of the attapulgite, and the reaction rate is gradually increased. When the amount of the catalyst reaches 0.3g, the dosage of the catalyst in the solution reaches saturation, the reaction is not affected by increasing the dosage of the catalyst, and the adsorption of the attapulgite reaches balance, so the degradation rate and the degradation rate are not increased any more.
As can be seen from examples 2 and 3, the ratio of the flow rate of the modified attapulgite to the flow rate of ozone was 5 to 6L/min per 0.3g of the modified attapulgite.
Example 4:
effect of reaction temperature on MB degradation rate:
the experiment was carried out at a rotation speed of 550r/min, an ozone flux of 6L/min, an amount of attapulgite of 0.4g, an initial concentration of MB solution of 50mg/L, a reaction temperature of 40 deg.C, 45 deg.C, 50 deg.C, 55 deg.C, 60 deg.C. The degradation rate of MB is plotted against time in FIG. 8.
As can be seen from fig. 8, when the reaction temperature is less than 50 ℃, the MB degradation rate gradually increases with the increase of the reaction temperature; when the reaction temperature is greater than 55 ℃, the MB degradation rate gradually decreases with the increase of the reaction temperature; when the reaction temperature is 50-55 ℃, the change of the reaction temperature has little influence on the degradation change of the MB, and the degradation effect of the MB is optimal. Therefore, the degradation rate of MB increases and then decreases with increasing reaction temperature.
Because of the poor stability of ozone, under the condition of normal temperature, the decomposition reaction is easy to occur, and the formula is as follows:
2O3-3O2+ΔH＝284(KJ·Mol-1)
TABLE 1 solubility of ozone in water (measured under 101 kPa)
The half-life period of ozone decomposition in water is related to temperature, when the temperature is lower than 50 ℃, the decomposition speed is correspondingly accelerated in the raising process, more OH is generated in the solution, meanwhile, the raising of the temperature can increase the proportion of activated molecules in the reaction system, the effective collision probability is increased, and the degradation rate is accelerated. However, when the temperature is increased to a certain value, the solubility of ozone in water is greatly reduced, as shown in Table 1, which also results in a reduction in OH that ozone can decompose in water, thereby reducing the degradation rate.
The invention provides a method for degrading methylene blue-containing wastewater by catalytic ozonation of modified attapulgite. The invention uses Fe (NO)3)3The modified attapulgite is combined with ozone to catalyze and promote the degradation of the wastewater containing methylene blue. According to the invention, the stirring speed is preferably 450r/min, the catalysis temperature is 50 ℃, the ratio of the flow rate of the modified attapulgite to the flow rate of ozone is preferably 5-6L/min per 0.3g of modified attapulgite, and the synergistic effect of the two is better.
The method for treating the wastewater containing the methylene blue, provided by the invention, has the characteristics of practicality, convenience and high efficiency, and is suitable for wide application.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. A method for degrading methylene blue-containing wastewater by catalytic ozonation of modified attapulgite is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
and heating the wastewater containing methylene blue under stirring, adding the modified attapulgite, introducing ozone into the wastewater, and reacting at constant temperature.
2. The method for the catalytic ozonization degradation of wastewater containing methylene blue by using the modified attapulgite as claimed in claim 1, wherein the method comprises the following steps: and heating under stirring, wherein the heating is oil bath heating, and the reaction temperature is controlled to be 40-60 ℃.
3. The method for the catalytic ozonization degradation of wastewater containing methylene blue by using the modified attapulgite as claimed in claim 1, wherein the method comprises the following steps: the stirring speed is 350-550 r/min.
4. The method for the catalytic ozonization degradation of wastewater containing methylene blue by using the modified attapulgite as claimed in claim 1, wherein the method comprises the following steps: the preparation process of the modified attapulgite comprises the following steps,
soaking 10g of 200 mesh original attapulgite in 100ml of 10% dilute hydrochloric acid for 6 hr, washing with water, vacuum filtering to neutrality, oven drying with bellows for 4 hr, and adding 0.5mol/L Fe (NO)3)3Soaking for 12h, washing with water, filtering to neutrality, and drying with bellows for 8 h; then calcining for 6 hours at 450 ℃ by using a tube furnace, collecting in a plastic package bag after the calcination is finished and cooling, and storing in a dryer.
5. The process for preparing a modified attapulgite according to claim 4, wherein: the original attapulgite has a standard chemical formula of Mg5Si8O20(HO)2(OH2)4·4H2O, chemical composition is SiO2、MgO、Al2O3Mainly comprises the following steps.
6. The method for the catalytic ozonization degradation of wastewater containing methylene blue by using the modified attapulgite as claimed in claim 1, wherein the method comprises the following steps: 0.1-0.4 g of modified attapulgite is added into every 50mg/L of methylene blue wastewater.
7. The method for the catalytic ozonization degradation of wastewater containing methylene blue by using the modified attapulgite as claimed in claim 1, wherein the method comprises the following steps: and introducing ozone, wherein the ozone flow is configured to be 5-6L/min for every 0.3g of modified attapulgite.
8. The method for the catalytic ozonization degradation of wastewater containing methylene blue by using the modified attapulgite as claimed in claim 1, wherein the method comprises the following steps: the constant temperature reaction is a reaction in which the temperature is maintained at 50-55 ℃.
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