CN110548544A - Iron oxide doped iron metal organic framework, green macro preparation method and application - Google Patents
Iron oxide doped iron metal organic framework, green macro preparation method and application Download PDFInfo
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- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/1691—Coordination polymers, e.g. metal-organic frameworks [MOF]
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- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/22—Organic complexes
- B01J31/2204—Organic complexes the ligands containing oxygen or sulfur as complexing atoms
- B01J31/2208—Oxygen, e.g. acetylacetonates
- B01J31/2226—Anionic ligands, i.e. the overall ligand carries at least one formal negative charge
- B01J31/223—At least two oxygen atoms present in one at least bidentate or bridging ligand
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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
- C02F1/722—Oxidation by peroxides
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- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/40—Organic compounds containing sulfur
Abstract
The invention discloses an iron oxide doped iron metal organic framework material, a green macro preparation method and application, wherein the preparation method comprises the following steps: (1) grinding and uniformly mixing ferrous sulfate heptahydrate and trimesic acid, adding a sodium hydroxide solution, transferring the mixture into a microwave reaction kettle, performing ultrasonic treatment, heating, and cooling to room temperature to obtain a mixed liquid; (2) and (2) washing the mixed liquid obtained in the step (1), centrifuging to obtain a solid, washing the obtained solid, and drying in vacuum to obtain the iron oxide doped iron metal organic framework material. According to the invention, the synthesis of the heterogeneous catalyst is carried out by a microwave solid-phase co-crystallization method, the synthesis period is greatly shortened, the synthesis process is green, environment-friendly and efficient, and the synthesized iron oxide doped iron metal organic framework material can fully utilize unsaturated metal sites thereof to efficiently activate persulfate so as to degrade organic pollutants, thereby avoiding the generation of iron mud, reducing the synthesis cost of the heterogeneous catalytic material and the degradation cost of the organic pollutants, and improving the water environment quality.
Description
Technical Field
the invention belongs to the technical field of water pollution control, relates to a deep oxidation treatment and advanced oxidation technology of organic pollutants in water, and particularly relates to an iron oxide doped iron metal organic framework, a green macro preparation method and application.
Background
Organic pollutants such as industrial dyes, pesticides, Pharmaceuticals and Personal Care Products (PPCPs) have attracted more attention due to their high toxicity and stability, SR-AOPs based on sulfate radicals (SO 4 · - ) have also gradually become a hot spot for organic pollutant treatment, SR-AOPs have many advantages over conventional advanced oxidation processes based on hydroxyl radicals OH, SO 4 · - has a higher oxidation potential (SO 4 · - , 2.6-3.1V. OH, 1.8-2.7V.), SO 4 · - can effectively react with target pollutants over a wide pH range, SO 4 · - is more selective and has a longer half-life (SO 4 · - , AO30-40. mu.s; OH, < 1. mu.s.) thus, SR-AOPs have a broad prospect in degrading pollutants, especially persistent organic pollutants.
4 ·- 4 ·-in addition, the conventional synthesis methods of MOFs (water/solvent heat and the like) require high temperature and high pressure conditions, introduction of strongly corrosive acids (hydrofluoric acid, concentrated nitric acid and the like) easily causes potential safety hazards, a large amount of toxic and harmful solvents (N, N-dimethylformamide and the like) are required in the synthesis process to promote crystallization, synthesis of waste liquid generated by synthesis can cause secondary pollution, the conventional synthesis methods of MOFs also limit the problems of low yield and the like, the application of the conventional synthesis methods of MOFs also limits the application of the conventional synthesis methods in the field of environmental protection, the method can be used for safely synthesizing an iron oxide framework, and the method can be used for safely reducing the yield of an iron oxide doped with green metal, and simultaneously, the method can be beneficial to the reduction of the yield of an iron oxide doped with green metal, and the improvement of the yield of an iron oxide doped with a green metal framework, and the safety of a macro-organic metal framework synthesis material.
Disclosure of Invention
the invention provides a green macro preparation method of iron oxide doped iron metal organic framework capable of effectively solving the problems and a method for activating persulfate to degrade organic pollutants by applying the green macro preparation method to activate persulfate, aiming at the problems that the prior ferrous ion (iron ion) homogeneous catalyst is easy to lose efficacy, cannot be recycled and generates iron mud, the energy consumption is high, the high-temperature and high-pressure conditions are harsh, the synthesis period is long, the secondary pollution is serious, the separation and recovery are difficult, the activation efficiency of the iron-containing heterogeneous catalyst is low and the like in the process of synthesizing a metal organic framework material. According to the invention, the heterogeneous catalyst is synthesized by a microwave solid-phase co-crystallization method, the synthesis period is greatly shortened, no acid/alkali with strong corrosivity is introduced, toxic and harmful solvents are not needed, the synthesis process is green, environment-friendly and efficient, the synthesized iron oxide doped with the iron metal organic framework material can fully utilize unsaturated metal sites thereof to efficiently activate persulfate to degrade organic pollutants, and the iron oxide doped with the iron metal organic framework material can be simply recycled through magnetic separation, so that the generation of iron mud can be avoided, the synthesis cost of the heterogeneous catalytic material and the degradation cost of the organic pollutants are reduced, and the water body environment quality is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a green macro-preparation method of iron oxide doped iron metal organic framework, which comprises the following steps:
(1) Uniformly mixing ferrous sulfate heptahydrate and trimesic acid, adding a sodium hydroxide solution, transferring to a microwave reaction kettle, performing ultrasonic treatment, heating, and cooling to room temperature to obtain a mixed liquid;
(2) And (2) washing the mixed liquid obtained in the step (1), centrifuging to obtain a solid, washing the obtained solid, and drying in vacuum to obtain the iron oxide doped iron metal organic framework material, namely Fe-MOFs-MW.
Preferably, the molar ratio of the ferrous sulfate heptahydrate to the trimesic acid in the step (1) is (0.75-2): 1;
The molar weight ratio of the sodium hydroxide to the ferrous sulfate heptahydrate is (0.4-3) to 1;
the volume of the sodium hydroxide solution is 1/5-1/10 of the volume of the microwave reaction kettle.
Preferably, the microwave reaction kettle in the step (1) is provided with a polytetrafluoroethylene lining; respectively grinding and crushing ferrous sulfate heptahydrate and trimesic acid, and then uniformly mixing, wherein the grinding time is 20-30 min; the ultrasonic treatment time is 15-30 min; the cooling refers to ice water bath or natural cooling in air.
Preferably, the heating in the step (1) refers to putting the microwave reaction kettle into a microwave heater for heating; the microwave heater is a household adjustable microwave oven; the microwave power is 50-90w, and the microwave heating time is 50-120 min.
preferably, the mixed liquid obtained in the washing step (1) in the step (2) is washed by deionized water or ultrapure water, the deionized water or ultrapure water is added into the mixed liquid, and the mixed liquid is magnetically stirred and centrifuged.
Preferably, the solid obtained by washing in the step (2) is obtained by mixing deionized water or ultrapure water with the solid, magnetically stirring, centrifugally pouring out supernatant, repeating the washing operation for 2-3 times, and then washing with absolute ethyl alcohol for 2-3 times; the volume of deionized water, ultrapure water or absolute ethyl alcohol used for washing the solid each time is 5-30 times of the volume of the sodium hydroxide solution; the magnetic stirring time is 60-120 min; the centrifugal rotating speed is 8000-11000 r/min, and the centrifugal time is 8-15 min; the vacuum drying temperature is 60-75 deg.C, and the vacuum drying time is 16-24 h.
The invention also provides the iron oxide doped iron metal organic framework prepared by the preparation method.
The invention also provides application of the iron oxide doped iron metal organic framework material in activating persulfate to degrade organic pollutants, persulfate and the iron oxide doped iron metal organic framework material are added into organic wastewater, and the organic wastewater is placed in a constant-temperature oscillation incubator or a magnetic stirrer to be uniformly mixed and reacted.
preferably, the persulfate is sodium persulfate, potassium persulfate, or ammonium persulfate; the molar ratio of persulfate to the degradation target pollutant in the organic wastewater is (80-800): 1;
The volume ratio of the mass of the iron oxide-doped iron metal organic framework material to the organic wastewater is 0.2-2 g/L.
preferably, the rotation speed of the constant-temperature shaking incubator or the magnetic stirrer is 150-250 r/min, and the reaction temperature is 20-60 ℃.
Compared with the prior art, the invention has the following advantages that:
(1) according to the green macro-synthesis method of the iron oxide doped iron metal organic framework material, substances with strong corrosivity do not need to be added, a large amount of toxic and harmful solvents do not need to be added, waste liquid generated in the synthesis process is less, and secondary pollution is avoided;
(2) the green macro-synthesis method of the iron oxide doped iron metal organic framework material provided by the invention has the advantages of low energy input and high utilization efficiency. Simple operation, safety, reliability, mild condition, short synthesis period and high yield. The application prospect in the actual large-scale production and synthesis is wide;
(3) The iron oxide-doped iron metal organic framework material synthesized by the method can anchor more unsaturated metal active sites, the efficiency of activating persulfate to degrade pollutants is high, and meanwhile, the pore structure of the iron metal organic framework can enhance the mass transfer effect of the pollutants and increase the reaction sites of the material and the pollutants;
(4) the iron oxide-doped iron metal organic framework material synthesized by the method disclosed by the invention has low iron ion elution amount in the process of activating persulfate through heterogeneous catalysis, basically no iron mud is generated, and the problem of subsequent treatment can be effectively avoided;
(5) the application method of the synthesized iron oxide-doped iron metal organic framework material in degrading organic pollutants is simple, convenient and reliable, has wide application range, does not have the requirement of additional energy input, can carry out reaction spontaneously, has higher degradation efficiency, can effectively and thoroughly degrade pollutants, and has wide application prospect.
drawings
FIG. 1 is an X-ray crystal diffraction pattern of iron oxide doped iron metal organic framework synthesized at different microwave heating times;
FIG. 2 is a graph of the efficiency of different materials in activating persulfate to degrade orange G;
FIG. 3 is an X-ray crystal diffraction pattern of iron oxide doped iron metal organic framework synthesized with microwave heating time of 90 min;
FIG. 4 shows the efficiency of doped iron metal organic frameworks of different iron oxides on the degradation of sulfamethoxazole by activated persulfate;
FIG. 5 shows the efficiency of degrading sulfamethoxazole by iron oxide doped with iron metal organic framework under different initial pH conditions;
FIG. 6 is a comparison of iron leaching amounts of PS-degraded sulfamethoxazole catalyzed and activated by iron metal organic framework doped with iron oxide at different initial pH values.
Detailed Description
the invention will now be described in further detail with reference to the following examples and figures, which illustrate the salient features and considerable developments of the invention, and which are intended to illustrate the invention and are in no way limited to the examples given below.
Example 1
The embodiment provides a green macro-preparation method of an iron oxide doped iron metal organic framework, which is used for preparing the iron oxide doped iron metal organic framework by the preparation method of the embodiment with different microwave heating time, and comprises the following steps:
Ferrous sulfate heptahydrate with the molar weight of 8mmol and trimesic acid with the molar weight of 8mmol are weighed, placed in an agate mortar and fully ground until the ferrous sulfate heptahydrate and the trimesic acid are completely and uniformly mixed, and transferred to a 50mL microwave reaction kettle with a polytetrafluoroethylene lining. And then adding 10mL of sodium hydroxide solution with the molar concentration of 1.6mol/L into the microwave reaction kettle, screwing a cover of the microwave reaction kettle, carrying out ultrasonic treatment for 30min, putting the microwave reaction kettle into a cavity of a common household microwave oven, setting the microwave power to be 70w, setting the microwave heating time to be 50min, 60min, 70min, 90min and 120min respectively, taking out the microwave reaction kettle after the microwave heating is finished, and placing the microwave reaction kettle in the air for cooling for 3 hours until the temperature of the microwave reaction kettle is reduced to the room temperature. Transferring the reacted mixture into a 150mL beaker, adding 50mL of ultrapure water, flushing a microwave reaction kettle, merging flushing liquid into the beaker, magnetically stirring for 60min, transferring the mixed liquid into a 50mL centrifugal tube, centrifuging for 10min at 10000r/min by a high-speed centrifuge, pouring supernatant, washing the centrifuged solid ultrapure water for 2 times according to the operation, ensuring that the unreacted ferrous sulfate heptahydrate is complete, removing centrifugation, and pouring the supernatant. Transferring the centrifuged solid into a 150mL beaker, adding 50mL of absolute ethyl alcohol, magnetically stirring for 60min, transferring the mixed solution into a 50mL centrifugal tube, centrifuging the mixed solution for 10min at 10000r/min by a high-speed centrifuge, pouring supernatant, repeatedly washing the centrifuged solid for 2 times by using the absolute ethyl alcohol according to the operation, and ensuring that trimesic acid which does not participate in coordination crystallization is completely removed. And centrifuging in a high-speed centrifuge, pouring supernatant, transferring the centrifuge tube filled with centrifuged solid into a vacuum drying oven, and vacuum drying at 65 ℃ for 24h to obtain orange solid which is the iron oxide-doped iron metal organic framework synthesized in different microwave heating times and marked as Fe-MOFs-MW-50min, Fe-MOFs-MW-60min, Fe-MOFs-MW-70min, Fe-MOFs-MW-90min and Fe-MOFs-MW-120 min.
an XRD spectrum of the iron oxide-doped iron metal organic framework material synthesized in example 1 with different microwave heating times is shown in fig. 1, which is an XRD crystal diffraction pattern at microwave times of 50min, 60min, 70min, 90min and 120min, respectively, and the iron oxide-doped iron metal organic framework has 6 characteristic diffraction peaks within the angular ranges of 2 θ ═ 9 °, 12 °, 15 °, 19 °, 24 ° and 28 °, which are relatively matched with the characteristic peaks of MIL-100 crystal, and also has characteristic peaks of ferroferric oxide at 2 θ ═ 27.4 ° and 36.5 °, which indicates that the synthesized iron oxide-doped iron metal organic framework material is. From fig. 1, it can be found that the materials synthesized by different microwave heating times have different diffraction peak intensities, the positions of diffraction peaks of the samples are highly consistent, and the iron oxide doped iron metal organic framework material with better crystallinity can be synthesized in shorter synthesis time, which further illustrates the stability and reliability of the synthesis method of the present invention.
Example 2
The embodiment provides a preparation method of an iron oxide doped iron metal organic framework material, which comprises the following steps:
(1) weighing 8mmol ferrous sulfate heptahydrate and 5.33mmol trimesic acid, placing in an agate mortar, and fully grinding until the ferrous sulfate heptahydrate and the trimesic acid are completely and uniformly mixed to obtain a mixture-1;
(2) weighing 8mmol ferrous sulfate heptahydrate and 8mmol trimesic acid, and placing in an agate mortar for fully grinding until the ferrous sulfate heptahydrate and the trimesic acid are completely and uniformly mixed to obtain a mixture-2;
(3) weighing 8mmol ferrous sulfate heptahydrate and 10.66mmol trimesic acid, placing in an agate mortar, and fully grinding until the ferrous sulfate heptahydrate and the trimesic acid are completely and uniformly mixed to obtain a mixture-3;
(4) Mix-1, mix-2 and mix-3 were each transferred to a 50mL teflon lined microwave reactor. And then adding 10mL of sodium hydroxide solution with the molar concentration of 1.6mol/L into the microwave reaction kettle, screwing a cover of the microwave reaction kettle, carrying out ultrasonic treatment for 30min, putting the microwave reaction kettle into a cavity of a common household microwave oven, setting the microwave power to be 70w, setting the microwave heating time to be 90min respectively, taking out the microwave reaction kettle after the microwave heating is finished, placing the microwave reaction kettle in air, cooling the microwave reaction kettle for 3 hours until the temperature of the microwave reaction kettle is reduced to the room temperature, and obtaining mixed liquid-1, mixed liquid-2 and mixed liquid-3 respectively. Transferring the reacted mixed liquid-1, the mixed liquid-2 and the mixed liquid-3 into a 150mL beaker, adding 50mL of ultrapure water, flushing a microwave reaction kettle, merging flushing liquid into the beaker, magnetically stirring for 60min, transferring the mixed liquid into a 50mL centrifugal tube, centrifuging for 10min at 10000r/min by a high-speed centrifuge, pouring supernatant, washing the centrifuged solid with ultrapure water for 2 times according to the operation, ensuring that unreacted ferrous sulfate heptahydrate is completely removed, and pouring the supernatant after centrifugation. Transferring the centrifuged solid into a 150mL beaker, adding 50mL of absolute ethyl alcohol, magnetically stirring for 60min, transferring the mixed solution into a 50mL centrifugal tube, centrifuging the mixed solution for 10min at 10000r/min by a high-speed centrifuge, pouring supernatant, repeatedly washing the centrifuged solid for 2 times by using the absolute ethyl alcohol according to the operation, and ensuring that trimesic acid which does not participate in coordination crystallization is completely removed. And (3) pouring supernatant after centrifuging in a high-speed centrifuge, transferring the centrifuge tube filled with centrifuged solid into a vacuum drying oven, and carrying out vacuum drying at 65 ℃ for 24h to obtain orange solid, wherein the orange solid is iron oxide doped iron metal organic frameworks synthesized by different trimesic acid adding amounts, namely a No. 1 sample, a No. 2 sample and a No. 3 sample.
example 3
the embodiment provides a preparation method of an iron oxide doped iron metal organic framework material, which analyzes the preparation of iron oxide doped iron metal organic framework materials with different sodium hydroxide adding amounts, and the preparation method comprises the following steps:
Weighing 8mmol ferrous sulfate heptahydrate and 8mmol trimesic acid, placing in an agate mortar, fully grinding until the mixture is completely and uniformly mixed, and respectively transferring the mixture to a 50mL polytetrafluoroethylene-lined microwave reaction kettle. Then respectively adding the mixture into a microwave reaction kettle
(1)10mL of ultrapure water;
(2)10mL of sodium hydroxide solution with the molar concentration of 1.6 mol/L;
(3)10mL of sodium hydroxide solution with the molar concentration of 2.4 mol/L;
and after ultrasonic treatment is carried out for 30min, the microwave reaction kettle is placed into a cavity of a common household microwave oven, the microwave power is set to be 70w, the microwave heating time is respectively set to be 90min, the microwave reaction kettle is taken out after the microwave heating is finished and is placed in the air to be cooled for 3 h until the temperature of the microwave reaction kettle is reduced to the room temperature, and mixed liquid-4, mixed liquid-5 and mixed liquid-6 are respectively obtained. Transferring the reacted mixed liquid-4, mixed liquid-5 and mixed liquid-6 into a 150mL beaker, adding 50mL of ultrapure water, flushing a microwave reaction kettle, merging flushing liquid into the beaker, magnetically stirring for 60min, transferring the mixed liquid into a 50mL centrifugal tube, centrifuging for 10min at 10000r/min by a high-speed centrifuge, pouring supernatant, washing the centrifuged solid with ultrapure water for 2 times according to the operation, ensuring that unreacted ferrous sulfate heptahydrate is complete, removing the centrifugation, and pouring the supernatant. Transferring the centrifuged solid into a 150mL beaker, adding 50mL of absolute ethyl alcohol, magnetically stirring for 60min, transferring the mixed solution into a 50mL centrifugal tube, centrifuging the mixed solution for 10min at 10000r/min by a high-speed centrifuge, pouring supernatant, repeatedly washing the centrifuged solid for 2 times by using the absolute ethyl alcohol according to the operation, and ensuring that trimesic acid which does not participate in coordination crystallization is completely removed. And (3) pouring supernatant after centrifuging in a high-speed centrifuge, transferring the centrifuge tube filled with centrifuged solid into a vacuum drying oven, and carrying out vacuum drying at 65 ℃ for 24h to obtain orange solid, namely iron oxide doped iron metal organic frameworks (No. 4 sample, No. 5 sample and No. 6 sample) synthesized by different sodium hydroxide adding amounts.
The yield of the iron oxide doped iron metal organic framework material synthesized under different microwave-assisted solid phase synthesis conditions is analyzed, the iron oxide doped iron metal organic frameworks (the No. 1 sample, the No. 2 sample, the No. 3 sample, the No. 4 sample, the No. 5 sample and the No. 6 sample) prepared under different microwave solid phase synthesis conditions are subjected to yield analysis by a ten-thousandth balance, and the STY (space-time-yield) value of the iron oxide doped iron metal organic framework in a unit time unit space is calculated by yield, wherein the total volume of the synthesis reaction is calculated by 30mL, as can be seen from Table 1, compared with the traditional hydrothermal method (STY is 500 kg/m 3. d), the green macro-prepared iron oxide doped iron metal organic framework material yield greatly improved by adopting the method disclosed by the invention is over 1000kg/m 3. meanwhile, the STY value in the No. 4 sample without sodium hydroxide is greatly reduced, the effect of the method disclosed by the invention on yield improvement is further proved by comparing with the No. 2 and No. 5 sample synthesized under the same synthesis conditions, and the method disclosed by the invention can realize the high-efficiency and stable macro synthesis method.
TABLE 1 yield of iron oxide doped iron metal organic framework material synthesized under different microwave-assisted solid phase synthesis conditions
Example 4
in the embodiment, iron oxide doped iron metal organic framework is used as a catalyst, and Orange G (OG) is used as simulated organic wastewater for degradation. And carrying out comparison by carrying out heterogeneous catalysis on OG degradation by persulfate through different materials.
Using a 250mL triangular flask as a reaction vessel, 100mL of OG solution with a molar concentration of 0.2mM was added as a simulated wastewater, and the following materials were added to the triangular flask, respectively:
(1) No material is added;
(2)0.05g of Fe-MOFs-MW-90min (prepared in example 1);
(3)0.05g of Fe-MOFs-MW-120min (prepared in example 1);
(4)0.05g of Fe 3 O 4 -1: Fe 3 O 4 (available from Aladdin, Shanghai) labeled Fe 3 O 4 -1;
(5)0.05g of Fe 3 O 4 -2 prepared as described in example 1 for Fe-MOFs-MW-90min without addition of 8mM trimesic acid, the black solid powder obtained was designated Fe 3 O 4 -2;
The triangular flask is placed in constant-temperature shaking culture to react at a rotating speed of 180r/min, the temperature is set to be 25 ℃, sodium persulfate is not added in the first 100min of the reaction stage, sampling is carried out to analyze the effect of adsorbing OG of each material, sodium persulfate with the molar quantity of 1.6mmol is added in the reaction of 100min after adsorption saturation, the OG degradation efficiency of each material after activation of sodium persulfate is compared, as can be seen from figure 2, the single addition of sodium persulfate has almost no degradation effect on OG, the OG removal mainly passes through the degradation effect, the higher OG removal efficiency is that the OG removal efficiency is that Fe-MOFs-MW-90min and Fe-MOFs-120 min which are iron oxide doped iron metal organic framework materials synthesized in the embodiment 1, the OG removal efficiency reaches more than 98% 2 hours after the addition of sodium persulfate, the OG degradation efficiency is better than that of Fe 3 O 4 -1 and Fe 3 O 4 -2, the OG degradation efficiency is only about 25% after the limited addition of sodium persulfate is added for two hours, and the OG degradation effect of preparing iron oxide with the green activation in the embodiment 1 is further illustrated.
Example 5
In this example, the removal rate of SMX by different catalyst addition amounts was investigated using Fe-MOFs-MW-90min prepared in example 1 as a persulfate heterogeneous catalyst and Sulfamethoxazole (SMX) as an antibiotic-contaminated simulated organic wastewater.
FIG. 3 is a crystal diffraction pattern of Fe-MOFs-MW-90 min.
A250 mL triangular flask is used as a reaction container, 100mL of SMX solution with the mass concentration of 20mg/L (the molar concentration is about 0.08mmol/L) is added as simulated wastewater, then sodium persulfate with the molar quantity of 6mmol is added, and Fe-MOFs-MW-90min with the mass as follows is respectively added into the triangular flask:
(1) Adding no Fe-MOFs-MW-90 min;
(2)0.01g of Fe-MOFs-MW-90 min;
(3)0.05g of Fe-MOFs-MW-90 min;
(4)0.1g of Fe-MOFs-MW-90 min;
(5)0.15g of Fe-MOFs-MW-90 min;
the reaction was stirred on a magnetic stirrer at a speed of 220r/min, and samples were taken at intervals to determine the SMX concentration. FIG. 4 shows that the SMX degradation efficiency is activated by persulfate with different Fe-MOFs-MW-90min addition amounts, when only sodium persulfate is added, SMX has almost no degradation effect, the SMX degradation efficiency is remarkably improved along with the increase of the Fe-MOFs-MW-90min addition amount, after the Fe-MOFs-MW-90min addition amount is increased to 0.05g, the SMX degradation efficiency reaches 98% after the reaction is carried out for two hours, the degradation efficiency can be maintained at about 98% when the Fe-MOFs-MW-90min addition amount is continuously increased, and the optimal Fe-MOFs-MW-90min addition amount is 0.05g in consideration of the treatment cost and the degradation efficiency. The embodiment fully shows that the iron oxide-doped iron metal organic framework prepared in a green and macro scale manner can effectively activate persulfate to degrade SMX-type new pollutants, and has a wide application prospect in actual organic wastewater treatment.
Example 6
In this example, Fe-MOFs-MW-90min prepared in example 1 was used as a persulfate heterogeneous catalyst, Sulfamethoxazole (SMX) was used as an antibiotic-contaminated simulated organic wastewater, and the removal rate of SMX and the leaching amount analysis of iron ions in the system under different initial pH conditions were studied.
a250 mL triangular flask is used as a reaction vessel, 100mL of SMX solution with the mass concentration of 20mg/L (the molar concentration is about 0.08mmol/L) is added as simulated wastewater, and the initial pH value of the solution is adjusted by using 0.1mol/L sulfuric acid and 0.1mol/L sodium hydroxide solution, and the pH values are respectively:
(1) The initial pH was not adjusted and was 5.62;
(2) Adjusting the initial pH to 2.92;
(3) Adjusting the initial pH value to 6.08;
(4) adjusting the initial pH to 6.49;
(5) Adjusting the initial pH value to 9.13;
Then, sodium persulfate with the molar weight of 6mmol is respectively added into the solution after the initial pH is adjusted, 0.1g of Fe-MOFs-MW-90min prepared in the example 1 is respectively added into the triangular flask, the triangular flask is placed in a constant temperature shaking culture to react at the rotating speed of 180r/min, the temperature is set to be 25 ℃, and the sampling, measuring and analyzing are carried out for the set time: FIG. 5 shows the efficiency of degrading sulfamethoxazole by catalyzing and activating persulfate through the iron oxide doped with the iron metal organic framework under different initial pH values, and FIG. 6 shows the comparison of the iron leaching amount of degrading sulfamethoxazole by catalyzing and activating PS through the iron oxide doped with the iron metal organic framework under different initial pH values. The initial pH value is gradually changed from acidity to alkalinity, the removal rate of sulfamethoxazole can be kept at a higher level, and the iron oxide doped iron metal organic framework can activate persulfate to efficiently degrade organic pollutants under a wider initial pH condition. Meanwhile, in the whole reaction stage, the iron leaching amount is always kept at a low level no matter under acidic or neutral or even alkaline conditions, and the iron leaching amount is only less than 10mg/L under the acidic initial condition, so that the generation of iron mud can be greatly reduced, and the method has important significance in the treatment and application of degradation pollutants in the future.
the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any equivalent alterations, modifications or improvements made by those skilled in the art to the above-described embodiments using the technical solutions of the present invention are still within the scope of the technical solutions of the present invention.
Claims (10)
1. The green macro preparation method of the iron oxide doped iron metal organic framework is characterized by comprising the following steps of:
(1) Uniformly mixing ferrous sulfate heptahydrate and trimesic acid through solid-phase grinding, adding a sodium hydroxide solution, transferring to a microwave reaction kettle, performing ultrasonic microwave heating, and cooling to room temperature to obtain a mixed liquid;
(2) And (2) washing the mixed liquid obtained in the step (1), centrifuging to obtain a solid, washing the obtained solid, and drying in vacuum to obtain the iron oxide doped iron metal organic framework, namely Fe-MOFs-MW.
2. The green macro-preparation method of iron oxide doped iron metal organic framework as claimed in claim 1, wherein the molar ratio of ferrous sulfate heptahydrate to trimesic acid in step (1) is (0.75 ~ 2): 1;
the ratio of the molar weight of the sodium hydroxide to the molar weight of the ferrous sulfate heptahydrate is (0.4 ~ 3):1, and the volume of the sodium hydroxide solution is 1/5 ~ 1/10 of the volume of the microwave reaction kettle.
3. the green macro-preparation method of the iron oxide doped iron metal organic framework as claimed in claim 1, wherein in the step (1), the microwave reaction kettle is provided with a polytetrafluoroethylene lining; respectively grinding and crushing ferrous sulfate heptahydrate and trimesic acid, and then uniformly mixing, wherein the grinding time is 20-30 min; the ultrasonic treatment time is 15-30 min; the cooling refers to ice water bath or natural cooling in air.
4. The green macro-preparation method of the iron oxide doped iron metal organic framework of claim 1, wherein the heating in the step (1) is to put the microwave reaction kettle into a microwave heater for heating; the microwave heater is a household microwave oven with adjustable power; the microwave power is 50-90w, and the microwave heating time is 50-120 min.
5. The green macro-preparation method of iron oxide doped with iron metal organic framework as claimed in claim 1, wherein the mixed liquid obtained in the washing step (1) in the step (2) is washed with deionized water or ultrapure water, the deionized water or ultrapure water is added into the mixed liquid, and the mixed liquid is magnetically stirred and centrifuged.
6. the method for preparing iron oxide doped iron metal organic framework material according to claim 1, wherein the solid obtained by washing in step (2) is prepared by mixing deionized water or ultrapure water with the solid, magnetically stirring, centrifugally pouring the supernatant, repeating the washing operation for 2 ~ 3 times, and then washing with absolute ethyl alcohol for 2-3 times, wherein the volume of deionized water, ultrapure water or absolute ethyl alcohol used in each solid washing is 5-30 times of the volume of sodium hydroxide solution, the magnetic stirring time is 60-120min, the centrifugal rotation speed is 8000 ~ 11000r/min, the centrifugal time is 8 ~ 15min, the vacuum drying temperature is 60-75 ℃, and the vacuum drying time is 16-24 h.
7. The iron oxide doped iron metal organic framework prepared by the preparation method of any one of claims 1 to 6.
8. The application of the iron oxide-doped iron metal organic framework in degrading organic pollutants by activating persulfate as claimed in claim 7, is characterized in that persulfate and the iron oxide-doped iron metal organic framework material are added into the organic wastewater, and the organic wastewater is placed in a constant-temperature shaking incubator or a magnetic stirrer to be uniformly mixed and reacted.
9. The application of the iron oxide doped iron metal organic framework in degrading organic pollutants by activating persulfate according to claim 8, wherein the persulfate is sodium persulfate, potassium persulfate or ammonium persulfate, and the molar ratio of the persulfate to target pollutants for degradation in organic wastewater is (80 ~ 800): 1;
The volume ratio of the mass of the iron oxide doped iron metal organic framework material to the organic wastewater is 0.2 ~ 2 g/L.
10. the use of the iron oxide-doped iron metal organic framework of claim 8 for the activated persulfate degradation of organic pollutants at a temperature of from about 20 to about 20 ~ 60 ℃ at a speed of from about 150 ~ 250r/min for the thermostatted shaking incubator or magnetic stirrer.
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