CN108117125B - Method for removing dye in water body - Google Patents
Method for removing dye in water body Download PDFInfo
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- CN108117125B CN108117125B CN201611085188.XA CN201611085188A CN108117125B CN 108117125 B CN108117125 B CN 108117125B CN 201611085188 A CN201611085188 A CN 201611085188A CN 108117125 B CN108117125 B CN 108117125B
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- 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
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
- B01J20/0248—Compounds of B, Al, Ga, In, Tl
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- 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
- B01J20/0259—Compounds of N, P, As, Sb, Bi
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- 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
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
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- 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
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
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- 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
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
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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
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
Abstract
The invention discloses a method for removing dye in water, which comprises the following steps: mixing the modified steel slag and the dye wastewater for oscillation adsorption to finish the treatment of the dye wastewater; the modified steel slag is prepared by high-temperature modification and salicylic acid solution modification of steel slag. The method adopts the modified steel slag to carry out adsorption treatment on the dye wastewater, has the removal rate of the dye in the wastewater as high as 98 percent, realizes the high-efficiency removal of the dye in the wastewater, has the advantages of lower cost, high treatment efficiency, good treatment effect, simple treatment process, convenient operation, low investment cost and operation cost, no secondary pollution and the like, and simultaneously realizes the resource recycling of the solid waste steel slag.
Description
Technical Field
The invention belongs to the field of environmental management, and particularly relates to a method for removing dye in a water body.
Background
The harm of synthetic dyes in the environment has become more and more important. Tens of thousands of tons of dyes are released into the water every year, which not only endangers the health of aquatic animals and humans but also reduces the light transmittance of the water and thus hinders the photosynthesis of the system. Methylene blue is one of the most common and widely used industrial synthetic dyes. The methylene blue-containing waste water mainly comes from the industries of plastics, textiles, leather, cosmetics, paper making, printing and dye manufacturing. Studies have shown that methylene blue can cause unrecoverable damage to the eyes of humans and animals, and furthermore, methylene blue can cause heart rate increases, vomiting, shock, alzheimer's disease, pallor, jaundice, and tissue necrosis. Therefore, the treatment of methylene blue wastewater in the environment has become one of the problems to be solved at present.
For the treatment of dye wastewater, the traditional methods include adsorption, ion exchange, chemical coagulation, electrolysis, biological treatment and the like. Among these methods, the adsorption method has been receiving attention because of its high efficiency. The adsorption method is an easy and simple wastewater treatment method, and the currently widely used adsorbents include bentonite, activated carbon and the like, but the adsorbents have the defects of small adsorption capacity, high cost, poor regeneration performance and the like, so the adsorbents cannot be applied to large-scale environmental management.
The steel slag is one of the main solid wastes in steel smelting, and the yield is huge. According to statistics, the annual steel slag yield in China is more than 7000t, most of steel slag is not effectively recycled, steel slag accumulated in the past year occupies a large amount of land, and the steel slag has relatively smooth surface and low specific surface area, so that the adsorption capacity is small. Therefore, the method for efficiently removing the dye pollutants in the water body by using the steel slag has important significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the method for removing the dye in the water body, which has the advantages of high treatment efficiency, good treatment effect, simple treatment process, convenient operation, low cost and no secondary pollution.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method of removing dye from a body of water comprising the steps of: mixing the modified steel slag and the dye wastewater for oscillation adsorption to finish the treatment of the dye wastewater; the modified steel slag is prepared by high-temperature modification of steel slag and modification of salicylic acid solution.
In the above method for removing dye from water, preferably, the preparation of the modified steel slag comprises the following steps: taking the steel slag to carry out high-temperature treatment for 4 to 6 hours at 700 to 800 ℃, mixing the steel slag after the high-temperature treatment with a salicylic acid solution, and carrying out oscillation reaction for 2 to 4 hours to obtain the modified steel slag.
In the above method for removing dye from water, preferably, the salicylic acid solution is prepared by dissolving salicylic acid in a methanol/acetone composite solvent; the mass volume ratio of the salicylic acid to the methanol/acetone composite solvent is 50-60 g: 1L.
In the method for removing the dye in the water body, preferably, the volume ratio of the methanol to the acetone in the methanol/acetone composite solvent is 3: 7-7: 3.
In the above method for removing dye from water, preferably, the steel slag includes 20wt% to 50wt% of CaO and 7wt% to 24wt% of SiO 23 to 20 weight percent of Fe2O38 to 30 weight percent of FeO, 0.3 to 8 weight percent of MgO and 0.1 to 5 weight percent of Al2O30.1 to 3 weight percent of P2O5。
In the method for removing the dye in the water body, preferably, the mass volume ratio of the modified steel slag to the dye wastewater is 25 g-30 g: 1L.
In the above method for removing dye in water, preferably, the dye in the dye wastewater is methylene blue; the initial concentration of the dye in the dye wastewater is less than or equal to 200 mg/L.
In the method for removing the dye in the water body, preferably, the initial pH value of the dye wastewater is 3-10.
In the method for removing the dye in the water body, preferably, the initial pH value of the dye wastewater is 4-9.
In the above method for removing dye in water, preferably, the rotation speed of the oscillation adsorption is 160rpm to 200 rpm; the time of the oscillation adsorption is 1-2 h.
In the method of the present invention, the steel slag includes, but is not limited to, converter steel slag.
In the method of the invention, the mass-volume ratio of the steel slag after high-temperature treatment to the salicylic acid solution is 50-60 g: 1L, but the method is not limited thereto.
Compared with the prior art, the invention has the advantages that:
1. the invention provides a method for removing dye in water, which adopts modified steel slag to adsorb dye wastewater, has the removal rate of the dye in the wastewater as high as 98 percent, and realizes the high-efficiency removal of the dye in the wastewater. The method for removing the dye in the water body by using the modified steel slag has the advantages of low cost, high treatment efficiency, good treatment effect, simple treatment process, convenient operation, low investment cost and operation cost, no secondary pollution and the like, and simultaneously realizes the resource recycling of the solid waste steel slag.
2. In the invention, the alkaline components such as CaO on the surface of the steel slag are removed after high-temperature modification and salicylic acid solution modification, so that the alkalinity of the steel slag is effectively reduced, the influence of hydrolysis of the alkaline components in the steel slag on the pH value of a reaction system is prevented, and the problems that the pH value of the solution is increased sharply (can reach more than 12) due to continuous hydrolysis of the alkaline components such as CaO on the surface of the unmodified steel slag in an aqueous solution, the pH value of the solution is difficult to control in the treatment process and the like are solved. In addition, the steel slag is subjected to high-temperature modification and salicylic acid solution modification, so that a plurality of hollow structures can be formed on the surface of the modified steel slag, the specific surface area of the steel slag is greatly improved, more adsorption sites are provided for adsorption of pollutants, the adsorption capacity of the steel slag on the pollutants is effectively improved, and the treatment efficiency and treatment effect of the methylene blue are improved.
Drawings
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
FIG. 1 is a graph showing the adsorption removal effect of unmodified converter steel slag (unmodified steel slag) and modified steel slag on methylene blue in wastewater at different times in example 1 of the present invention.
FIG. 2 is an electron scanning microscope photograph of unmodified converter steel slag (A), high-temperature modified converter steel slag (B) and high-temperature modified converter steel slag (C) in example 1 of the present invention.
FIG. 3 is a SEM energy spectrum analysis chart of unmodified converter steel slag (A) and high-temperature modified and salicylic acid modified converter steel slag (B) in example 1 of the present invention.
FIG. 4 is a graph showing the adsorption removal effect of different amounts of modified steel slag on methylene blue in wastewater in example 2 of the present invention.
FIG. 5 is a graph showing the adsorption removal effect of the modified steel slag in example 3 on methylene blue in wastewater at different temperatures.
FIG. 6 is a graph showing the adsorption removal effect of the modified steel slag on methylene blue wastewater with different pH values in example 4 of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
The raw materials and instruments used in the following examples are commercially available, wherein the steel slag used is converter steel slag, and is purchased from a certain mineral product processing plant in Lingshou county of North Hebei province, and the metallurgical slag (i.e. the converter steel slag) is dried and then crushed into particles with the diameter of about 0.3mm, and is used for treating the dye-polluted water body. The main components of the metallurgical slag adopted by the invention are 46.95 wt% of CaO and 10.63 wt% of SiO29.65 wt% Fe2O313.45 wt% FeO, 4.86 wt% MgO, 3.64 wt% Al2O31.85% by weight of P2O5。
Example 1
The method for removing the dye in the water body comprises the following steps:
(1) 500g of salicylic acid is dissolved in 10L of methanol/acetone composite solvent (the volume ratio of methanol to acetone is 1: 1) to obtain salicylic acid solution.
(2) And (2) carrying out high-temperature treatment on the converter steel slag at 700 ℃ for 4h, cooling for later use, mixing 600g of the converter steel slag subjected to high-temperature treatment with the salicylic acid solution in the step (1), carrying out oscillation reaction for 2h, filtering, washing with clear water, and drying to obtain the modified steel slag.
(3) And (3) taking 2 parts of methylene blue solution with the volume of 1L, the initial concentration of 200mg/L and the initial pH of 5.4, respectively adding 10g of unmodified converter steel slag and 10g of modified steel slag in the step (2), mixing, and performing oscillation adsorption at the normal temperature and the rotation speed of 180rpm to finish the removal of the methylene blue.
Sampling from the reaction system after oscillating adsorption for 0.5h, 1h, 2h, 3h and 4h, and detecting the content of methylene blue in the solution by using an ultraviolet-visible spectrophotometer, wherein the result is shown in figure 1. FIG. 1 is a graph showing the adsorption removal effect of unmodified converter steel slag (unmodified steel slag) and modified steel slag on methylene blue in wastewater at different times in the present example. As shown in FIG. 1, the adsorption removal rate of the modified steel slag to methylene blue is obviously higher than that of the unmodified converter steel slag. Therefore, the modified steel slag obtained by high-temperature modification and salicylic acid modification has greatly improved methylene blue adsorption performance. Under the conditions that the initial concentration of methylene blue is 200mg/L, the addition amount is 10g/L and the oscillation adsorption time is 2 hours, the adsorption capacity of the unmodified steel slag to the methylene blue is 0.49mg/g, and under the same conditions, the adsorption capacity of the modified steel slag to the methylene blue reaches 8.41 mg/g. Compared with unmodified steel slag, the adsorption capacity of the modified steel slag of the invention to methylene blue is improved by nearly 20 times. In addition, as can be seen from fig. 1, the modified steel slag has very rapid absorption of methylene blue, and when the oscillation absorption time is longer than 1 hour, the removal rate of the methylene blue tends to be stable. As can be seen, the optimal time for treating the methylene blue solution by the method is 1 h.
The specific surface area and the pore volume of the converter steel slag powder and the modified converter steel slag powder are measured as follows:
table 1 shows the specific surface area and pore volume of the unmodified converter steel slag (A), the high-temperature modified converter steel slag (B) and the high-temperature modified converter steel slag (C). As can be seen from Table 1: the unmodified converter steel slag has smaller specific surface area (4.36 m)2G), the specific surface area of the converter steel slag is increased to 7.53m after high-temperature treatment2The reason is that the specific surface area of the steel slag of the converter is further increased to 43.8m after the steel slag is treated by the salicylic acid-methanol-acetone solution (i.e. the salicylic acid solution in the step (1)) to form cracks on the surface of the steel slag possibly due to high-temperature treatment2(ii)/g; the results of the tests in Table 1 also show that the pore volume was similarly changed, probably due to the removal of basic components such as CaO from the surface of the converter slag by salicylic acid, leaving Fe2O3And the like, a large number of hollow structures are formed.
Table 1: steel slag specific surface area and pore volume detection result table
| Sample (I) | A | B | C |
| Specific surface area (m)2/g) | 4.36 | 7.53 | 43.8 |
| Pore volume (cm)3/g) | 0.013 | 0.022 | 0.092 |
Scanning the converter steel slag powder and the modified converter steel slag powder by an electron microscope:
FIG. 2 is a scanning electron microscope image of the unmodified converter steel slag (A), the high-temperature modified converter steel slag (B) and the high-temperature modified converter steel slag (C). As can be seen from fig. 2: the surface of the unmodified converter steel slag is relatively flat, but is subjected to mechanical crushing, so that the surface of the unmodified converter steel slag has a plurality of pits; after the surface morphology of the converter steel slag is greatly changed after the converter steel slag is modified by high temperature and salicylic acid, the surface of the converter steel slag becomes uneven, a plurality of concave-convex structures are formed, the contact area of the converter steel slag and methylene blue is increased by the changes, and the adsorption effect is facilitated.
Performing scanning electron microscope energy spectrum component analysis on the converter steel slag powder and the modified converter steel slag powder:
FIG. 3 is a scanning electron microscope energy spectrum analysis chart of unmodified converter steel slag (A) and converter steel slag (B) after high temperature modification and salicylic acid modification in this example. The analysis of the energy spectrum components of the scanning electron microscope further verifies that the CaO components on the surface of the steel slag are removed by the modification treatment. As can be seen from fig. 3: after the steel slag is modified, the proportion of Ca element is obviously reduced, and the proportion of Fe element is obviously increased.
Example 2
The method for removing the dye in the water body comprises the following steps:
(1) 500g of salicylic acid is dissolved in 10L of methanol/acetone composite solvent (the volume ratio of methanol to acetone is 1: 1) to obtain salicylic acid solution.
(2) And (2) carrying out high-temperature treatment on the converter steel slag at 700 ℃ for 4h, cooling for later use, mixing 600g of the converter steel slag subjected to high-temperature treatment with the salicylic acid solution in the step (1), carrying out oscillation reaction for 2h, filtering, washing with clear water, and drying to obtain the modified steel slag.
(3) And (3) taking 4 parts of methylene blue solution with the volume of 1L, the initial concentration of 200mg/L and the initial pH of 5.4, adding 10g, 15g, 20g, 25g, 30g and 35g of the modified steel slag in the step (2) respectively, mixing, and carrying out vibration adsorption under the conditions of normal temperature and the rotation speed of 180rpm to finish the removal of the methylene blue.
After the oscillating adsorption is carried out for 1h, samples are respectively taken from the reaction system, and the content of methylene blue in the solution is detected by an ultraviolet-visible spectrophotometer, and the result is shown in figure 4. FIG. 4 is a graph showing the adsorption removal effect of different amounts of modified steel slag on methylene blue in wastewater. As is clear from FIG. 4, when the amount of addition was 25g/L, the removal rate of the modified steel slag of the present invention with respect to the methylene blue solution having an initial concentration of 200mg/L was 98% or more. The dosage of the modified steel slag is increased continuously, the removal rate of the methylene blue is not changed greatly, so that the optimal addition amount of the methylene blue solution treated by the method is 25g/L from the viewpoint of saving the cost.
Example 3
The method for removing the dye in the water body comprises the following steps:
(1) 500g of salicylic acid is dissolved in 10L of methanol/acetone composite solvent (the volume ratio of methanol to acetone is 1: 1) to obtain salicylic acid solution.
(2) And (2) carrying out high-temperature treatment on the converter steel slag at 700 ℃ for 4h, cooling for later use, mixing 600g of the converter steel slag subjected to high-temperature treatment with the salicylic acid solution in the step (1), carrying out oscillation reaction for 2h, filtering, washing with clear water, and drying to obtain the modified steel slag.
(3) And (3) taking 5 parts of methylene blue solution with the volume of 1L, the concentration of 200mg/L and the initial pH of 5.4, adding 25g of the modified steel slag in the step (2) respectively, mixing, and carrying out oscillatory adsorption at the rotation speed of 180rpm and at the temperature of 20 ℃, 25 ℃, 30 ℃, 35 ℃ and 40 ℃ to finish the removal of the methylene blue.
After the oscillating adsorption is carried out for 1h, samples are respectively taken from the reaction system, and the content of methylene blue in the solution is detected by an ultraviolet-visible spectrophotometer, and the result is shown in figure 5. FIG. 5 is a graph showing the adsorption removal effect of the modified steel slag in the present embodiment on methylene blue in wastewater at different temperatures. As can be seen from FIG. 5, the modified steel slag of the present invention has almost no influence on the change of the removal rate of methylene blue with the increase of temperature, and can reach more than 98% within 1 hour, thus the modified steel slag of the present invention has good adaptability to temperature.
Example 4
The method for removing the dye in the water body comprises the following steps:
(1) 500g of salicylic acid is dissolved in 10L of methanol/acetone composite solvent (the volume ratio of methanol to acetone is 1: 1) to obtain salicylic acid solution.
(2) And (2) carrying out high-temperature treatment on the converter steel slag at 700 ℃ for 4h, cooling for later use, mixing 600g of the converter steel slag subjected to high-temperature treatment with the salicylic acid solution in the step (1), carrying out oscillation reaction for 2h, filtering, washing with clear water, and drying to obtain the modified steel slag.
(3) And (3) taking 9 parts of methylene blue solution with the volume of 1L and the initial concentration of 200mg/L, wherein the initial pH values of the methylene blue solution are 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 and 10.0 respectively, adding 25g of the modified steel slag obtained in the step (2), mixing, and carrying out vibration adsorption at the normal temperature and the rotation speed of 180rpm to complete the removal of the methylene blue.
After the oscillating adsorption is carried out for 1h, samples are respectively taken from the reaction system, and the content of methylene blue in the solution is detected by an ultraviolet-visible spectrophotometer, and the result is shown in figure 6. FIG. 6 is a graph showing the adsorption removal effect of the modified steel slag on methylene blue wastewater with different pH values in this example. As can be seen from fig. 6, the modified steel slag has a certain adsorption removal effect on methylene blue under low pH conditions (pH 2 and pH 3), and the removal rate of methylene blue exceeds 60% at pH 2 and 80% at pH 3. Under the condition of higher pH (pH 10), the adsorption removal effect of the modified steel slag on methylene blue is slightly reduced, but the removal rate of the methylene blue is still higher than 90%. This shows that the modified steel slag of the invention is not only suitable for acidic methylene blue solution, but also suitable for alkaline methylene blue solution. Therefore, the method has a good adsorption removal effect on methylene blue wastewater with the pH of 3-10, and has a good adsorption removal effect on methylene blue wastewater with the pH of 4-9.
Therefore, the method has good removal effect on methylene blue in the water body, and the removal rate of the methylene blue can reach more than 98%.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (7)
1. A method for removing dye from a body of water, comprising the steps of: mixing the modified steel slag and the dye wastewater for oscillation adsorption to finish the treatment of the dye wastewater; the modified steel slag is prepared by high-temperature modification of steel slag and modification of salicylic acid solution; the preparation of the modified steel slag comprises the following steps: taking the steel slag to carry out high-temperature treatment for 4 to 6 hours at 700 to 800 ℃, mixing the steel slag after the high-temperature treatment with a salicylic acid solution, and carrying out oscillation reaction for 2 to 4 hours to obtain modified steel slag; the salicylic acid solution is prepared by dissolving salicylic acid in a methanol/acetone composite solvent; the mass volume ratio of the salicylic acid to the methanol/acetone composite solvent is 50-60 g: 1L; the steel slag comprises 20-50 wt% of CaO and 7-24 wt% of SiO23 to 20 weight percent of Fe2O38 to 30 weight percent of FeO, 0.3 to 8 weight percent of MgO and 0.1 to 5 weight percent of Al2O30.1 to 3 weight percent of P2O5。
2. The method for removing the dye in the water body according to claim 1, wherein the volume ratio of methanol to acetone in the methanol/acetone composite solvent is 3: 7-7: 3.
3. The method for removing the dye in the water body according to claim 1 or 2, wherein the mass volume ratio of the modified steel slag to the dye wastewater is 25 g-30 g: 1L.
4. The method for removing dye from water body according to claim 1 or 2, wherein the dye in the dye wastewater is methylene blue; the initial concentration of the dye in the dye wastewater is less than or equal to 200 mg/L.
5. The method for removing the dye in the water body according to claim 1 or 2, wherein the initial pH value of the dye wastewater is 3-10.
6. The method for removing the dye from the water body according to claim 5, wherein the initial pH value of the dye wastewater is 4-9.
7. The method for removing the dye in the water body according to claim 1 or 2, wherein the rotating speed of the oscillating adsorption is 160-200 rpm; the time of the oscillation adsorption is 1-2 h.
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