CN110694583A - Preparation method and application of magnetic recyclable lanthanum oxycarbonate phosphorus removal adsorbent - Google Patents
Preparation method and application of magnetic recyclable lanthanum oxycarbonate phosphorus removal adsorbent Download PDFInfo
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Abstract
The invention discloses a preparation method and application of a magnetic recyclable lanthanum oxycarbonate phosphorus removal adsorbent, wherein the method comprises the following steps: step one, synthesizing a lanthanum/iron composite metal organic framework precursor; step two, primary calcination; step three, secondary calcination. The magnetic recyclable lanthanum oxycarbonate adsorbent prepared by the invention looks like a reddish brown powder solid in appearance, the microstructure shows an obvious rod-like and amorphous mixed structure, and the adsorbent shows rough and porous surfaces and has stronger adsorption capacity of a nano material and better magnetic separation capacity of a magnetic material. The recyclable magnetic lanthanum oxycarbonate phosphorus removal adsorbent can remove medium-and-low concentration phosphorus in industrial wastewater, domestic sewage and the like, and medium-and-low concentration phosphorus in surface water, secondary sedimentation tank effluent and the like. The preparation method of the magnetic recyclable adsorbent has the characteristics of simple preparation process, good reproducibility, short preparation period and the like, and has good application prospect.
Description
Technical Field
The invention belongs to the technical field of water body pollution treatment, and relates to a preparation method and application of a magnetic recyclable phosphorus removal adsorbent for removing phosphate radicals in water bodies.
Background
Phosphorus is an indispensable element for nucleic acid, which is a basic substance of living bodies, and is also a non-renewable natural resource. The existence of a proper amount of phosphorus in water is beneficial to promoting the growth of aquatic plants and maintaining the balance of an aquatic ecosystem. Once the concentration of phosphorus in the water body exceeds a certain limit value, the existence of excessive phosphorus can stimulate the massive proliferation of algae and other plankton in the water body, so that the concentration of dissolved oxygen in the water body is reduced, other organisms such as fishes and the like die in a large amount, the water quality is deteriorated, and the eutrophic water body is formed. On one hand, the landscape, entertainment and navigation functions of the water body can be reduced, and economic loss is caused. On the other hand, the variety of aquatic organisms can be destroyed, and the aquatic ecosystem is unbalanced.
The surplus of nitrogen and phosphorus nutrient elements in the water body is a main factor causing the eutrophication of the water body. Compared with the extensive source of nitrogen, the nitrogen can carry out the N in the atmosphere through the biological nitrogen fixation2Converted to an available nitrogen source. The control on the phosphorus content in the water body is more effective, more economical and feasible.
The existing means for removing phosphorus in water mainly comprise a chemical precipitation method, a biological treatment method, an adsorption method and the like. Among them, the adsorption method is receiving more and more attention due to its simple operation, low cost, high removal efficiency, and potential advantages of recycling non-renewable phosphorus resources. In addition, in order to meet the increasingly stringent phosphorus discharge standard and realize the standard improvement and transformation plan of sewage treatment plants, many units use the phosphorus removal adsorbent as a means for supplementing phosphorus removal in the subsequent stage of conventional water treatment.
Lanthanum is used as a rare earth element with abundant reserves, the price is relatively low, and the special electronic arrangement structure of the f orbit ensures that lanthanum has stronger adsorption affinity to phosphate radicals and can react with phosphorus in water to generate an insoluble lanthanum-phosphate complex (LaPO)4，pKsp= 26.15) is removed. Lanthanum modified bentonite adsorbent Phoslock developed by CISRO australia®Has been used for restoring eutrophic water bodies and bottom sludge,other lanthanum-based composite adsorbent materials are also being continuously developed and studied. However, many of the disclosed lanthanum-based supporting materials have limited adsorption capacity and insufficient selectivity due to low lanthanum loading and insufficient active adsorption sites, and thus the practical application of the lanthanum-based supporting materials is greatly limited. On the other hand, most of lanthanum-loaded materials are in a micron or nanometer grade, and are difficult to remove through direct precipitation after adsorption, and the means such as centrifugation and suction filtration used in a laboratory need to consume a large amount of energy, so that the lanthanum-loaded materials are not suitable for recycling, desorption and reutilization of adsorption materials after water treatment. Magnetic separation has attracted considerable attention for the recovery of used adsorbent materials due to its high separation efficiency, short separation time and relatively low energy consumption requirements.
Therefore, the development of the phosphorus removal adsorbent which is magnetic, recyclable, easy to produce and use in a large scale and has a good effect of removing phosphorus in the water body is of great significance.
Disclosure of Invention
In order to solve the problems that most lanthanum-based load materials are relatively low in adsorption capacity and difficult to recycle after adsorption, the invention provides a preparation method and application of a magnetic recyclable lanthanum oxycarbonate phosphorus removal adsorbent, which is simple in preparation process, low in preparation cost, good in phosphorus removal effect in a water body and easy to magnetically separate, recycle and reuse. The recyclable magnetic lanthanum oxycarbonate phosphorus removal adsorbent can remove medium-and-low concentration phosphorus in industrial wastewater, domestic sewage and the like, and medium-and-low concentration phosphorus in surface water, secondary sedimentation tank effluent and the like.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a magnetic recyclable lanthanum oxycarbonate phosphorus removal adsorbent comprises the following steps:
step one, synthesizing a lanthanum/iron composite metal organic framework precursor:
(1) weighing trimesic acid, dissolving in water/alcohol mixed solution, and keeping the temperature at 60 ~ 80 ℃ for 0.5 ~ 1.5.5 h to obtain solution A;
(2) weighing lanthanum nitrate hexahydrate and ferric chloride hexahydrate solid, and dissolving in deionized water to obtain solution B;
(3) dropwise adding the solution B into the solution A under the condition of a constant-temperature water bath at 60 ~ 80 ℃ to react, magnetically stirring for 0.5 ~ 2h, and then standing for 0.5 ~ 1.5.5 h to obtain a light orange lanthanum/iron composite organic framework precursor;
(4) washing the lanthanum/iron composite organic framework precursor for 4 ~ 6 times by using a water/ethanol mixed solution, drying at 60 ~ 80 ℃, and grinding to obtain a dried powder sample, wherein the dosage of trimesic acid is 5 ~ 30 mmol, the total dosage of lanthanum and iron metal is 5 ~ 30 mmol, the volume ratio of water to alcohol in the water/alcohol mixed solution is 5:1 ~ 1:1, and the volume ratio of water to alcohol in the water/alcohol mixed solution is 1: 1;
step two, primary calcination:
spreading the dried sample obtained in the step one in a quartz boat, placing the quartz boat in a tube furnace, and introducing N2Calcining at 400 ~ 600 deg.C for 2 ~ 3 h as shielding gas, cooling, and taking out to obtain a grey brown intermediate sample M;
step three, secondary calcination:
and (3) flatly paving the intermediate sample M obtained in the second step in a quartz boat, placing the quartz boat in a box-type muffle furnace, calcining for 1.5 ~ 3 h at the temperature of 400 ~ 450 ℃ in the air atmosphere to obtain the reddish-brown magnetic recyclable lanthanum oxycarbonate phosphorus removal adsorbent, which can be used for efficiently removing phosphorus with different concentrations in a water body.
In the invention, the dosage of the trimesic acid in the step one is preferably 10 mmol; the volume ratio of water to alcohol in the water/alcohol mixed solution is preferably 1:1, and the total volume of the mixed solution is preferably 900 ml; the total dosage of the lanthanum nitrate hexahydrate and the ferric chloride hexahydrate is preferably 10 mmol; the molar ratio of the amount of trimesic acid to the total amount of lanthanum nitrate hexahydrate and ferric chloride hexahydrate is preferably 1: 1.
In the invention, the dosage of the lanthanum nitrate hexahydrate and the ferric nitrate hexahydrate in the step one can be adjusted, and the proportion can be 1:0, 3:1, 2:1, 1:2, 1:3 and the like, and can be changed according to the needs.
In the invention, the reaction temperature in the step one is preferably 60 ℃, the magnetic stirring is vigorous stirring, and the stirring time is preferably 1 h.
In the present invention, the calcination temperature in the second step is preferably 500 ℃, N2The calcination time under protection is preferably 2 h.
In the invention, the calcination temperature in the third step is preferably 450 ℃, and the calcination time in the air atmosphere is preferably 2 h.
Compared with the prior art, the invention has the following advantages:
1. the magnetic recyclable lanthanum oxycarbonate (La) prepared by the invention2O2CO3/γ-Fe2O3) The adsorbent looks like a reddish brown powder solid in appearance, the microstructure shows an obvious rod-shaped and amorphous mixed structure, and the adsorbent shows rough and porous surfaces and has strong adsorption capacity of a nano material and good magnetic separation capacity of a magnetic material.
2. The magnetic recyclable lanthanum oxycarbonate phosphorus removal adsorbent can effectively remove phosphorus with different concentrations in a water body, including quickly and effectively removing low-concentration phosphorus in surface water and secondary sedimentation tank effluent.
3. The magnetic recyclable lanthanum oxycarbonate phosphorus removal adsorbent has stronger phosphate radical specific adsorption removal efficiency, the phosphorus removal rate can reach 99.9%, when the molar ratio of lanthanum to iron is 2:1, the maximum saturated adsorption capacity can reach 134.82mg P/g, the phosphorus concentration in a water body can be reduced to be below 10 ug/L (the lowest detection limit of a molybdenum-antimony spectrophotometry), and the magnetic recyclable lanthanum oxycarbonate phosphorus removal adsorbent can be effectively applied in a wider pH range (pH 3 ~ 8).
4. The magnetic recyclable lanthanum oxycarbonate phosphorus removal adsorbent prepared by the invention has good magnetic separation capacity and regeneration capacity, and can realize effective recovery of phosphorus resources and reutilization of the adsorbent.
5. The preparation method of the magnetic recyclable adsorbent has the characteristics of simple preparation process, good reproducibility, short preparation period and the like, and has good application prospect.
Drawings
FIG. 1 is a photograph of the magnetic lanthanum oxycarbonate adsorbent obtained in example 1;
FIG. 2 is a Scanning Electron Microscope (SEM) picture of the magnetic lanthanum oxycarbonate adsorbent obtained in example 1;
FIG. 3 is a Transmission Electron Microscope (TEM) picture of the magnetic lanthanum oxycarbonate adsorbent obtained in example 1;
FIG. 4 is an X-ray powder diffraction pattern (XRD) of the magnetic lanthanum oxycarbonate adsorbent obtained in example 1;
FIG. 5 is a graph of the magnetic separation performance (VSM) of the magnetic lanthanum oxycarbonate adsorbent obtained in example 1;
FIG. 6 is a graph showing isothermal phosphorus adsorption with the magnetic lanthanum oxycarbonate adsorbent obtained in application example 1;
FIG. 7 is a graph showing the effect of applying the magnetic lanthanum oxycarbonate adsorbent obtained in example 2 on the removal of low-concentration phosphorus;
FIG. 8 is a graph showing the comparison of the adsorption amounts of the magnetic lanthanum oxycarbonate adsorbent obtained in application example 3 under the interference of different types and concentrations of ions;
FIG. 9 is an infrared spectrum (FTIR) of the magnetic lanthanum oxycarbonate adsorbent obtained in example 1 and application example 1 before and after dephosphorization;
fig. 10 is a graph showing the regeneration and phosphorus desorption effects of the magnetic lanthanum oxycarbonate adsorbent pair obtained in example 1.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the protection scope of the present invention.
Example 1
The magnetic recoverable lanthanum oxycarbonate dephosphorizing adsorbent is prepared according to the following steps:
step one, synthesizing a lanthanum/iron composite metal organic framework precursor:
(1) weighing 10 mmol (2.10 g) of trimesic acid, dissolving in 900 ml of water/alcohol mixed solution with volume ratio of 1:1, placing in a magnetic stirring constant-temperature water bath kettle at 60 ℃ for 0.5 h to obtain solution A;
(2) weighing 6.67 mmol (2.89 g) of lanthanum nitrate hexahydrate and 3.33 mmol (0.90 g) of ferric chloride hexahydrate, and dissolving in 100ml of deionized water to obtain solution B;
(3) dropwise adding the solution B into the solution A under the condition of a constant-temperature water bath at 60 ℃, reacting for 1h under the action of violent magnetic stirring, and then standing for 0.5 h to obtain a light orange lanthanum/iron (2: 1, molar ratio) composite organic framework precursor;
(4) and washing the obtained precursor for 5 times by using a water/ethanol mixed solution with a volume ratio of 1:1, placing the precursor in a forced air drying oven, drying at 60 ℃, and grinding to obtain a dried powder sample.
Step two, primary calcination:
spreading the dried sample obtained in the step one in a quartz boat, placing the quartz boat in a tube furnace, and introducing N2Calcining at 500 ℃ for 2h as protective gas, cooling and taking out to obtain a gray-brown intermediate sample M.
Step three, secondary calcination:
flatly paving the intermediate sample M obtained in the second step in a quartz boat, placing the quartz boat in a box-type muffle furnace, calcining for 2 hours at the temperature of 450 ℃ in the air atmosphere to obtain the reddish brown magnetic lanthanum oxycarbonate (La)2O2CO3/γ-Fe2O3(2: 1)) phosphorus removal adsorbent.
FIG. 1 shows the magnetic recoverable lanthanum oxycarbonate (La) obtained in this example2O2CO3/γ-Fe2O3(2: 1)) physical photograph of the appearance of the dephosphorizing adsorbent, it can be seen as a reddish brown fine powder solid.
Fig. 2 is an SEM photograph of the magnetic lanthanum oxycarbonate phosphorus removal adsorbent obtained in this example, and it can be seen that the rod-shaped structure and the amorphous structure of the magnetic lanthanum oxycarbonate phosphorus removal adsorbent are mixed, the length of the rod-shaped structure is from several hundred nanometers to several micrometers, and the surface of the adsorbent is rough.
FIG. 3 is a TEM photograph of the magnetic lanthanum oxycarbonate dephosphorizing adsorbent obtained in this example, which is a rod-like structure with a non-uniform surface layer covered with magnetic γ -Fe2O3The interior of the shell is provided with a remarkable hole structure.
FIG. 4 is an XRD photograph of the magnetic lanthanum oxycarbonate phosphorus removal adsorbent obtained in the present example, which is obtained by comparing the standard spectrum with that of the sampleComparing the two to determine that the magnetic adsorbent has La2O2CO3And gamma-Fe2O3Two components.
FIG. 5 is a VSM photograph of the magnetic lanthanum oxycarbonate dephosphorizing adsorbent obtained in this example, which shows that the La prepared2O2CO3/γ-Fe2O3(2: 1) the saturation magnetization of the adsorbent is 10.16 emu/g, and the adsorbent can be quickly separated from the treated water under the action of a hand-held magnet.
The advantages and beneficial results of the invention are verified by the following application examples:
application example 1
Accurately weighing 20 mg of the lanthanum oxycarbonate dephosphorizing adsorbent obtained in example 1, and respectively adding KH containing 5 ~ 100 mg of P/L and 100 mg of P/L2PO4The solution (100 ml) was placed in a constant temperature shaker and shaken at 25 ℃ and 165 r/min for 24 h. And (3) taking the supernatant, measuring the concentration of the residual phosphate radical in the mixed solution by adopting a national standard ammonium molybdate spectrophotometry (GB11893-89), and drawing an isothermal adsorption curve of the sample.
The results obtained are shown in FIG. 6, La2O2CO3/γ-Fe2O3(2: 1) the magnetic adsorbent has better removing capacity to phosphate anions, the saturated adsorption capacity of the magnetic adsorbent can reach 134.82mg P/g, and the magnetic adsorbent has good competitiveness.
Application example 2
A certain amount of the magnetic lanthanum oxycarbonate adsorbent obtained in example 1 was weighed and added to KH having initial phosphorus concentrations of 0.5mg P/L and 1.0 mg P/L, respectively2PO4In the solution, the solution was shaken at 25 ℃ and a rotation speed of 165 r/min. Taking out supernatant liquid at certain time intervals, and measuring the concentration of the residual phosphate radical in the mixed liquid.
The results obtained are shown in FIG. 7, where La can be seen2O2CO3/γ-Fe2O3(2: 1) the magnetic adsorbent has a good effect of removing low-concentration phosphate anions, and the concentration of phosphorus in the mixed solution is gradually reduced along with the prolonging of the adsorption time. When the initial concentration of phosphorus is 0.5 mg/L, the addition amount of the adsorbentWhen the concentration of phosphorus in the solution is 0.1 g/L, the concentration of phosphorus in the solution can be reduced to below 10 mu g/L only in 20 min; when the initial concentration of phosphorus is 1.0 mg/L and the addition amount of the adsorbent is 0.1 g/L, the concentration of phosphorus in the solution can be reduced to below 10 mu g/L in only 40 min, the phosphorus removal rate is higher than 99%, and the obtained magnetic adsorbent has a quick and good removal effect on low-concentration phosphate radicals.
Application example 3
Weighing a certain amount of the magnetic lanthanum oxycarbonate phosphorus removal adsorbent obtained in example 1, and adding 100ml of KH respectively2PO4Adding different types and concentrations of anions into the mixed solution, placing the mixed solution in a constant temperature shaking table, and oscillating for 24 h at 25 ℃ and 165 r/min. The initial concentration of phosphate in the solution is controlled to be 20 mg P/L, the dosage of the magnetic adsorbent is 0.2 g/L, and the concentration of the exogenous anion is 50 mg/L and 100 mg/L. And after the adsorption is finished, taking the supernatant to measure the content of the residual phosphorus in the mixed solution. The solution without the addition of other anions served as a control.
The obtained result is shown in fig. 8, and it can be seen that the presence of five anions, namely fluoride, chloride, nitrate, sulfate and bicarbonate, has no or minimal influence on the removal of phosphate, which indicates that the obtained magnetic lanthanum oxycarbonate adsorbent has good selectivity and strong anti-interference capability on phosphate.
FIG. 9 is a photograph of an infrared spectrum (FTIR) of the magnetic lanthanum oxycarbonate adsorbent obtained in example 1 and application example 1 after adsorbing phosphorus, and it can be seen that the wave number is 614 cm after adsorbing phosphorus-1The asymmetric bending vibration peak of phosphate radical appears at a wave number of 1052 cm-1The strong symmetric stretching vibration peak of the phosphate radical appears, which shows that the magnetic adsorbent adsorbs more phosphate radicals and has good removal effect on phosphorus.
The magnetic separation recovery and recycling performance of the invention is verified by the following application examples:
application example 4
0.5 g of the magnetic adsorbent obtained in example 1 was weighed out and added to 500 ml of KH containing 50 mg of P/L2PO4Placing the solution in a constant temperature shaking table at 25 deg.COscillating for 24 hours under the condition of 165 r/min to obtain the saturated adsorbent. Washing the saturated adsorbent with deionized water for three times, and adding the saturated adsorbent containing 2 mol of NaOH and 1 mol of Na2CO3The mixed solution was shaken at a constant temperature of 80 ℃ for 12 hours, and the supernatant was taken to measure the phosphorus concentration and calculate the phosphorus desorption ratio. And (4) washing the regenerated adsorbent with deionized water for several times, and drying to continuously utilize the adsorbent as the adsorbent in the next round. This was repeated 5 times.
The results are shown in FIG. 10, 2 mol NaOH and 1 mol Na2CO3Mixed solution for saturated La2O2CO3/γ-Fe2O3(1: 1) the magnetic adsorbent has better desorption effect, the desorption rate is higher than 85% in five cycles, and the adsorption capacity of the magnetic adsorbent is slightly reduced, probably because irreversible complexes are formed in the adsorption process and occupy active sites. Higher phosphorus desorption capacity and regeneration capacity are beneficial to the recovery of non-renewable phosphorus resources and the regeneration and utilization of the phosphorus removal adsorbent.
Example 2
This example differs from example 1 in that: the dosage of lanthanum nitrate hexahydrate and the dosage of ferric chloride hexahydrate are both 5 mmol, and the molar ratio of metal lanthanum to iron is 1: 1.
The phosphorus adsorption performance of the sample was tested under the experimental conditions listed in application example 1, and the results show that La2O2CO3/γ-Fe2O3(1: 1) the magnetic adsorbent also has better removing capability to phosphate anions, and the saturated adsorption capacity of the magnetic adsorbent can reach 102.41 mg P/g.
Example 3
This example differs from example 1 in that: the dosage of the trimesic acid is 30 mmol.
The isothermal adsorption batch experiment is used for detecting the phosphorus removal performance of the magnetic adsorbent in the embodiment, and the result shows that the saturated adsorption capacity of the magnetic adsorbent is 142.56 mg P/g.
Example 4
This example differs from example 1 in that: the stirring temperature was 80 ℃.
The isothermal adsorption batch experiment is used for detecting the phosphorus removal performance of the magnetic adsorbent in the embodiment, and the result shows that the saturated adsorption capacity of the magnetic adsorbent is 128.47 mg P/g.
Example 5
This example differs from example 1 in that: the primary calcination temperature is 600 ℃, and the calcination time is 2 hours; the secondary calcination is 400 ℃, and the calcination time is 2 h.
The isothermal adsorption batch experiment is used for detecting the phosphorus removal performance of the magnetic adsorbent in the embodiment, and the result shows that the saturated adsorption capacity of the magnetic adsorbent is 125.21 mg P/g.
Claims (10)
1. A preparation method of a magnetic recyclable lanthanum oxycarbonate phosphorus removal adsorbent is characterized by comprising the following steps:
step one, synthesizing a lanthanum/iron composite metal organic framework precursor:
(1) weighing trimesic acid, dissolving in water/alcohol mixed solution, and keeping the temperature at 60 ~ 80 ℃ for 0.5 ~ 1.5.5 h to obtain solution A;
(2) weighing lanthanum nitrate hexahydrate and ferric chloride hexahydrate solid, and dissolving in deionized water to obtain solution B;
(3) dropwise adding the solution B into the solution A under the condition of a constant-temperature water bath at 60 ~ 80 ℃ to react, magnetically stirring for 0.5 ~ 2h, and then standing for 0.5 ~ 1.5.5 h to obtain a light orange lanthanum/iron composite organic framework precursor;
(4) cleaning a lanthanum/iron composite organic framework precursor for 4 ~ 6 times by using a mixed solution of water/ethanol, drying at 60 ~ 80 ℃, and grinding to obtain a dried powder sample, wherein the dosage of trimesic acid is 5 ~ 30 mmol, and the total dosage of lanthanum and iron metal is 5 ~ 30 mmol;
step two, primary calcination:
spreading the dried sample obtained in the step one in a quartz boat, placing the quartz boat in a tube furnace, and introducing N2Calcining at 400 ~ 600 deg.C for 2 ~ 3 h as shielding gas, cooling, and taking out to obtain a grey brown intermediate sample M;
step three, secondary calcination:
and (4) flatly paving the intermediate sample M obtained in the step two in a quartz boat, placing the quartz boat in a box type muffle furnace, and calcining for 1.5 ~ 3 hours at the temperature of 400 ~ 450 ℃ in the air atmosphere to obtain the reddish brown magnetic recoverable lanthanum oxycarbonate dephosphorizing adsorbent.
2. The method for preparing the magnetic recoverable lanthanum oxycarbonate dephosphorizing adsorbent according to claim 1, characterized in that the volume ratio of water to alcohol in the water/alcohol mixed solution is 5:1 ~ 1:1, and the volume ratio of water to ethanol in the water/ethanol mixed solution is 1: 1.
3. The method for preparing the magnetic recoverable lanthanum oxycarbonate dephosphorizing adsorbent according to claim 2, characterized in that the volume ratio of water to alcohol in the water/alcohol mixed solution is 1:1, and the total volume of the mixed solution is 900 ml.
4. The method for preparing the magnetic recoverable lanthanum oxycarbonate dephosphorizing adsorbent according to claim 1, wherein the dosage of the trimesic acid is 10 mmol; the total amount of lanthanum nitrate hexahydrate and ferric chloride hexahydrate is 10 mmol.
5. The preparation method of the magnetic recoverable lanthanum oxycarbonate phosphorus removal adsorbent according to claim 1 or 4, characterized in that the dosage of the lanthanum nitrate hexahydrate and the ferric nitrate hexahydrate is 1:0, 3:1, 2:1, 1:2 or 1: 3.
6. The method for preparing the magnetic recoverable lanthanum oxycarbonate phosphorus removal adsorbent according to claim 1, wherein the reaction temperature is 60 ℃ and the magnetic stirring time is 1 h.
7. The method for preparing the magnetic recoverable lanthanum oxycarbonate dephosphorizing adsorbent according to claim 1, characterized in that the primary calcination temperature is 500 ℃ and the calcination time is 2 h.
8. The method for preparing the magnetic recoverable lanthanum oxycarbonate dephosphorizing adsorbent according to claim 1, characterized in that the secondary calcination temperature is 450 ℃ and the calcination time is 2 h.
9. A magnetic recoverable lanthanum oxycarbonate dephosphorizing adsorbent prepared by the method of any one of claims 1-8.
10. Use of the magnetic recoverable lanthanum oxycarbonate phosphorus removal adsorbent prepared by the method of any one of claims 1-8 in removing phosphorus in a water body.
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