Preparation method and application of black talc loaded hydrotalcite functional material
By constructing a black talc-hydrotalc composite material, the stability and adsorption capacity of hydrotalc materials in the treatment of phosphorus pollution in water were solved, achieving efficient removal of phosphorus and heavy metals from water and enhancing the utilization value of black talc.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-04
- Publication Date
- 2026-04-07
AI Technical Summary
Existing hydrotalcite materials suffer from problems such as easy aggregation, poor structural stability, and limited recycling performance in the treatment of phosphorus pollution in water. Black talc has limited adsorption capacity when used as an adsorbent, making it difficult to efficiently remove phosphorus and heavy metals from water.
A black talc-hydrotalc composite material was constructed by mechanically grinding black talc and loading hydrotalc using a co-precipitation method. This composite material is used for the efficient removal of phosphorus from water and can also be used as a soil phosphate fertilizer and heavy metal remediation agent.
It achieves efficient removal of phosphorus from water, improves the utilization rate of black talc, and provides slow-release soil phosphorus and silicon fertilizer and heavy metal remediation effects.
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Figure CN121797253A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of black talc utilization, and particularly relates to a preparation method of black talc loaded hydrotalcite functional material and application thereof. BACKGROUND
[0002] At present, most of the water bodies in China are under the dual stress of eutrophication and heavy metal pollution. The nitrogen and phosphorus in agricultural non-point source emissions and domestic sewage lead to the excessive growth of algae in water bodies and deterioration of water quality; and the lead, cadmium and other heavy metals brought in by industrial wastewater and mining activities are also enriched in water bodies. The superposition of double pollution not only destroys the water ecological balance, but also threatens the safety of drinking water and human health, and the difficulty of treatment is significantly increased.
[0003] Layered double hydroxides (LDHs), i.e. hydrotalcite, is a kind of two-dimensional layered structure anionic clay mineral. Its layer plate contains metal cations, and the interlayer has anions, and it has adsorption, ion exchange and catalytic performance. It can adsorb heavy metals and anion pollutants in wastewater treatment, and is also used in the fields of catalyst carrier and plastic stabilizer, and is widely used in environmental protection, chemical industry and other industries due to its controllable structure and excellent performance. However, single hydrotalcite has the shortcomings of easy agglomeration, poor structural stability, limited recycling performance and the like, and through loading modification, the interface structure and use stability can be optimized, the adsorption-regeneration cycle efficiency can be improved, and the practical application scene of the hydrotalcite in deep phosphorus removal in water bodies can be expanded.
[0004] Black talc is a magnesium silicate mineral, and its main chemical components are silicon dioxide and magnesium oxide. It is black due to the presence of organic matter, and the content of talc is more than 92%. It is a high-grade talc ore, and after calcination process treatment, the whiteness is as high as 95%, and it is widely used in the fields of environmental governance, papermaking, medicine, aviation and the like. When used as an adsorbent for phosphorus and heavy metal pollution in water, its adsorption capacity is limited, and the performance of the black talc needs to be improved through modification to realize high-value utilization of the black talc resources.
[0005] In view of this, the present application combines the advantages of black talc silicon and magnesium resources and the excellent adsorption capacity of hydrotalcite for phosphorus and heavy metals to construct a black talc-hydrotalcite composite material, which is used as an efficient adsorbent for phosphorus pollution in water, and is further used as a soil phosphorus fertilizer, silicon fertilizer and heavy metal remediation agent. SUMMARY
[0006] Therefore, the present application provides a preparation method of black talc loaded hydrotalcite functional material and application thereof. The black talc is mechanically ground, and then the hydrotalcite is loaded on the black talc through a coprecipitation method to construct a black talc-hydrotalcite composite material, so that the phosphorus in water is efficiently removed, and the adsorbed material is used as a soil phosphorus fertilizer, silicon fertilizer and heavy metal remediation agent.
[0007] The present application aims to provide a preparation method of black mica loaded hydrotalcite functional material, and obtain a black mica-hydrotalcite composite material capable of efficiently removing phosphorus in water.
[0008] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:
[0009] The present application provides a preparation method of black mica loaded hydrotalcite functional material, comprising the following steps:
[0010] (1) Preparation of black mica powder: mechanically dry ball milling the black mica, and passing through a 100-200 mesh sieve;
[0011] (2) Solution preparation: dissolving divalent metal salt and trivalent metal salt in deionized water respectively to obtain trivalent metal salt solution and divalent metal salt solution, mixing the two to obtain A liquid; preparing an alkaline solution of 1-5 mol / L, and the obtained solution is B liquid;
[0012] (3) Preparation of functional material: adding the black mica powder into the A liquid, stirring to disperse, and adding the B liquid drop by drop under stirring, controlling the pH to be 9-12, and after adding, the solution is left to stand and age for 10-30 min, and the obtained solution after aging is filtered to obtain the required solid residue, which is washed with water for three times, dried at 50-90°C for 2-3 h, ground and sieved to 100 mesh to obtain the functional material.
[0013] Preferably, the mechanical dry ball milling time in step (1) is 2-4 h, and the rotation speed is 100-300 rpm.
[0014] Preferably, the divalent metal salt in step (2) is at least one of CaCl2, MgCl2, ZnCl2, Ca(NO3)2, ZnSO4 and MgSO4; and the trivalent metal salt is at least one of AlCl3, FeCl3, Fe(NO3)3, Al(NO3)3 and Fe2(SO4)3.
[0015] Preferably, the concentration of trivalent metal ions in the trivalent metal salt solution in step (2) is 0.08-0.12 mol / L, the concentration of divalent metal ions in the divalent metal salt solution is 0.1-0.4 mol / L, and the molar ratio of trivalent metal ions to divalent metal ions in the A liquid is 1:1-1:6.
[0016] Preferably, the ratio of the black mica powder to the A liquid in step (3) is 1-3 g:200 mL.
[0017] Another object of the present application is to provide a black mica loaded hydrotalcite functional material prepared by the above-mentioned method.
[0018] The third objective of this invention is to apply the aforementioned black talc-loaded hydrotalc functional material to adsorb phosphorus in water, and then use the adsorbed material as a soil phosphorus and silicon fertilizer and to fix heavy metals.
[0019] Preferably, the method for adsorbing phosphorus in water is as follows: the adsorbent material is placed in a solution containing phosphate and stirred for adsorption to obtain the black talc-loaded hydrotalc functional material.
[0020] Preferably, the concentration of phosphate in the phosphate-containing solution is 100~200 mg / L;
[0021] The temperature for the stirring adsorption is 20-25℃, the adsorption time is 2-2.5h, and the stirring speed is 100-150rpm.
[0022] Compared with the prior art, the present invention has the following beneficial effects:
[0023] This invention involves mechanically grinding and sieving black talc, and then loading hydrotalc onto black talc using a co-precipitation method to construct a black talc-hydrotalc composite material. This achieves efficient removal of phosphorus from water, resulting in a slow-release soil phosphorus and silicon fertilizer, and improves the utilization rate of black talc. Attached Figure Description
[0024] Figure 1 The effect of different ratios of black talc and calcium aluminum hydrotalc on the removal rate.
[0025] Figure 2 The effect of different ratios of black talc and magnesium aluminum hydrotalc on the removal rate.
[0026] Figure 3 The effect of M-BT@CaAl-LDH on phosphorus removal rate at different pH values.
[0027] Figure 4 The effect of M-BT@MgAl-LDH on phosphorus removal rate at different pH values.
[0028] Figure 5 This is a comparison chart of the cumulative leaching rate of phosphate fertilizer in Examples 9, 10, and 5. Detailed Implementation
[0029] The present invention will be further described below with reference to the embodiments.
[0030] Example 1
[0031] A method for preparing a black talc-loaded hydrotalcite functional material includes the following steps:
[0032] (1) Preparation of black talc powder: 2g of black talc was mechanically dry-milled for 2h at a speed of 150rpm and passed through a 100-mesh sieve;
[0033] (2) Solution preparation: Take 3.3261 g of CaCl2 and 1.3316 g of AlCl3, dissolve them in 100 ml of deionized water respectively to obtain aluminum salt solution and calcium salt solution, mix the two to obtain solution A; take NaOH to prepare a 2 mol / L NaOH solution, the resulting solution is solution B;
[0034] (3) Preparation of functional material: The black talc powder is added to solution A and stirred to disperse it. Solution B is added drop by drop under stirring, and the pH is controlled to be 12. After addition, the solution is allowed to stand for 30 minutes. The solution obtained after aging is filtered to obtain the required solid filter residue. It is washed three times with 200 ml of water, dried at 60℃ for 2 hours, ground and sieved through a 100-mesh sieve to obtain the functional material M-BT@CaAl-LDH.
[0035] Weigh 0.1 g of adsorbent material into an Erlenmeyer flask, add 100 ml of 200 mg / L phosphate solution, and place it in a constant temperature shaker at 25℃ and 150 rpm for adsorption reaction. After 2 h of adsorption, take a sample and detect the phosphate concentration. The phosphate removal rate is 97.18% and the adsorption capacity is 196.1 mg / g.
[0036] Example 2
[0037] A method for preparing a black talc-loaded hydrotalcite functional material includes the following steps:
[0038] (1) Preparation of black talc powder: 2g of black talc was mechanically dry-milled for 2h at a speed of 150rpm and passed through a 100-mesh sieve;
[0039] (2) Solution preparation: Take 2.8579 g of MgCl2 and 1.3316 g of AlCl3, dissolve them in 100 ml of deionized water respectively to obtain aluminum salt solution and magnesium salt solution, mix the two to obtain solution A; take NaOH to prepare a 2 mol / L NaOH solution, the resulting solution is solution B;
[0040] (3) Preparation of functional material: The black talc powder is added to solution A and stirred to disperse it. Solution B is added drop by drop under stirring, and the pH is controlled to be 12. After addition, the solution is allowed to stand for 30 minutes. The solution obtained after aging is filtered to obtain the required solid filter residue. It is washed three times with 200 ml of water, dried at 60℃ for 2 hours, ground and sieved through a 100-mesh sieve to obtain the functional material M-BT@MgAl-LDH.
[0041] Weigh 0.4 g of adsorbent material into an Erlenmeyer flask, add 100 ml of 100 mg / L phosphate solution, and place it in a constant temperature shaker at 25 °C and 150 rpm for adsorption reaction. After 2 h of adsorption, take a sample and detect the phosphate concentration. The phosphate removal rate is 98.04%, and the adsorption capacity is 24.81 mg / g.
[0042] Example 3
[0043] A method for preparing a black talc-loaded hydrotalcite functional material includes the following steps:
[0044] (1) Preparation of black talc powder: 1g of black talc was mechanically dry-milled for 2 hours at a speed of 150rpm and passed through a 100-mesh sieve.
[0045] (2) Solution preparation: Take 3.3261 g of CaCl2 and 1.3316 g of AlCl3, dissolve them in 100 ml of deionized water respectively to obtain aluminum salt solution and calcium salt solution, mix the two to obtain solution A; take NaOH to prepare a 2 mol / L NaOH solution, the resulting solution is solution B;
[0046] (3) Preparation of functional material: The black talc powder is added to solution A and stirred to disperse it. Solution B is added drop by drop under stirring, and the pH is controlled to be 12. After addition, the solution is allowed to stand for 30 minutes. The solution obtained after aging is filtered to obtain the required solid filter residue. It is washed three times with 200 ml of water, dried at 60℃ for 2 hours, ground and sieved through a 100-mesh sieve to obtain the functional material L-BT@CaAl-LDH.
[0047] Weigh 0.1 g of adsorbent material into an Erlenmeyer flask, add 100 ml of 100 mg / L phosphate solution, and place it in a constant temperature shaker at 25℃ and 150 rpm for adsorption reaction. After 2 h of adsorption, take a sample and detect the phosphate concentration. The phosphate removal rate is 90.11%, and the adsorption capacity is 90.16 mg / g.
[0048] Example 4
[0049] A method for preparing a black talc-loaded hydrotalcite functional material includes the following steps:
[0050] (1) Preparation of black talc powder: 3g of black talc was dry ball milled for 2 hours at a speed of 150rpm and passed through a 100-mesh sieve.
[0051] (2) Solution preparation: Take 3.3261 g of CaCl2 and 1.3316 g of AlCl3, dissolve them in 100 ml of deionized water respectively to obtain aluminum salt solution and calcium salt solution, mix the two to obtain solution A; take NaOH to prepare a 2 mol / L NaOH solution, the resulting solution is solution B;
[0052] (3) Preparation of functional material: The black talc powder is added to solution A and stirred to disperse it. Solution B is added drop by drop under stirring, and the pH is controlled to be 12. After addition, the solution is allowed to stand for 30 minutes. The solution obtained after aging is filtered to obtain the required solid filter residue. It is washed three times with 200 ml of water, dried at 60℃ for 2 hours, ground and sieved through a 100-mesh sieve to obtain the functional material H-BT@CaAl-LDH.
[0053] Weigh 0.1g of adsorbent material into an Erlenmeyer flask, add 100ml of 100mg / L phosphate solution, and place it in a constant temperature shaker at 25℃ and 150 rpm for adsorption reaction. After 2 hours of adsorption, take a sample and detect the phosphate concentration. The phosphate removal rate is 92.02%, and the adsorption capacity is 95.74 mg / g.
[0054] Example 5
[0055] A method for preparing a black talc-loaded hydrotalcite functional material includes the following steps:
[0056] (1) Preparation of black talc powder: 1g of black talc was dry ball-milled for 2 hours at a speed of 150rpm and passed through a 100-mesh sieve;
[0057] (2) Solution preparation: Take 2.8579 g of MgCl2 and 1.3316 g of AlCl3, dissolve them in 100 ml of deionized water respectively to obtain aluminum salt solution and magnesium salt solution, mix the two to obtain solution A; take NaOH to prepare a 2 mol / L NaOH solution, the resulting solution is solution B;
[0058] (3) Preparation of functional material: The black talc powder is added to solution A and stirred to disperse it. Solution B is added drop by drop under stirring, and the pH is controlled to be 12. After addition, the solution is allowed to stand for 30 minutes. The solution obtained after aging is filtered to obtain the required solid filter residue. It is washed three times with 200 ml of water, dried at 60°C for 2 hours, ground and sieved through a 100-mesh sieve to obtain the functional material L-BT@MgAl-LDH.
[0059] Weigh 0.4 g of adsorbent material into an Erlenmeyer flask, add 100 ml of 100 mg / L phosphate solution, and place it in a constant temperature shaker at 25 °C and 150 rpm for adsorption reaction. After 2 h of adsorption, take a sample and detect the phosphate concentration. The phosphate removal rate is 87.63%, and the adsorption capacity is 22.38 mg / g.
[0060] Example 6
[0061] A method for preparing a black talc-loaded hydrotalcite functional material includes the following steps:
[0062] (1) Preparation of black talc powder: 3g of black talc was dry ball-milled for 2 hours at a speed of 150rpm and passed through a 100-mesh sieve;
[0063] (2) Solution preparation: Take 2.8579 g of MgCl2 and 1.3316 g of AlCl3, dissolve them in 100 ml of deionized water respectively to obtain aluminum salt solution and magnesium salt solution, mix the two to obtain solution A; take NaOH to prepare a 2 mol / L NaOH solution, the resulting solution is solution B;
[0064] (3) Preparation of functional material: The black talc powder is added to solution A and stirred to disperse it. Solution B is added drop by drop under stirring, and the pH is controlled to be 12. After addition, the solution is allowed to stand for 30 minutes. The solution obtained after aging is filtered to obtain the required solid filter residue. It is washed three times with 200 ml of water, dried at 60℃ for 2 hours, ground and sieved through a 100-mesh sieve to obtain the functional material H-BT@MgAl-LDH.
[0065] Weigh 0.4 g of adsorbent material into an Erlenmeyer flask, add 100 ml of 100 mg / L phosphate solution, and place it in a constant temperature shaker at 25 °C and 150 rpm for adsorption reaction. After 2 h of adsorption, take a sample and detect the phosphate concentration. The phosphate removal rate is 89.93%, and the adsorption capacity is 22.97 mg / g.
[0066] Example 7
[0067] Prepare a 0.025 mol / L citric acid extract by dissolving 5.25 g of citric acid in 1000 ml of distilled water; weigh 1.00 g of the phosphorus-adsorbed M-BT@CaAl-LDH material and place it in a 250 ml Erlenmeyer flask. Add 50 ml of the prepared citric acid extract to the Erlenmeyer flask and shake well. Place the Erlenmeyer flask on a 30°C constant temperature stirrer and stir for 5 hours. Remove the flask and filter it with medium-speed quantitative filter paper to obtain the filtrate. Finally, send the filtrate to be sampled and the effective silicon content was determined to be 75 mg / kg.
[0068] Example 8
[0069] Prepare a 0.025 mol / L citric acid extract by dissolving 5.25 g of citric acid in 1000 ml of distilled water; weigh 1.00 g of phosphorus-adsorbed M-BT@MgAl-LDH and place it in a 250 ml Erlenmeyer flask, add 50 ml of the prepared citric acid extract to the flask and shake well. Place the flask on a 30°C constant temperature stirrer and stir for 5 hours. Remove the flask and filter it with medium-speed quantitative filter paper to obtain the filtrate. Finally, send the filtrate to be sampled and the effective silicon content was determined to be 150 mg / kg.
[0070] Comparative Example 1
[0071] 0.1 g of La-Fe modified vermiculite (La-Fe / VE-2) material was weighed and added to 100 ml of 200 mg / L phosphorus solution. The solution was placed in a constant temperature shaker at 25 ℃ and 120 rpm for adsorption reaction. After 2 h of adsorption, a sample was taken and the phosphate concentration was measured. The phosphorus removal rate was 61% and the maximum adsorption capacity was 122 mg / g.
[0072] The raw materials, methods, and experimental results are all referenced from the paper (Li Ling. Preparation of Bimetallic Composite Modified Vermiculite and its Adsorption and Phosphorus Removal Mechanism [D]. Guangxi University, 2024. DOI:10.27034 / d.cnki.ggxiu.2024.001315.).
[0073] Comparative Example 2
[0074] 0.1 g of porous self-supporting calcium sulfoaluminate (AFm-SPM) material was weighed and added to 100 ml of 100 mg / L phosphorus solution. The solution was placed in a shaker at 25 °C and 200 rpm for a certain period of time before being sampled and the phosphate concentration was measured. The phosphorus removal rate was 77.44% and the maximum adsorption capacity was 77.436 mg / g.
[0075] The raw materials, methods, and experimental results are all referenced from the paper (Zhang Chengjuan, Song Xuefeng. Phosphorus removal performance and mechanism of porous self-supporting calcium sulfoaluminate materials [J]. New Building Materials, 2025, 52(08):23-28+46.).
[0076] Comparative Example 3
[0077] Weigh 1.00 g of the adsorbent material calcium aluminum hydrotalcite (CaAl-LDH) and place it in a 250 ml Erlenmeyer flask. Add 50 ml of the citric acid extract prepared above and shake well. Place the Erlenmeyer flask on a 30°C constant temperature stirrer and stir for 5 hours. Remove the flask and filter it with medium-speed quantitative filter paper to obtain the filtrate. Finally, send the filtrate to the sample and test the content of available silicon. No silicon was detected.
[0078] Comparative Example 4
[0079] Weigh 1.00g of the adsorbent material magnesium aluminum hydrotalcite (MgAl-LDH) and place it in a 250ml Erlenmeyer flask. Add 50ml of the citric acid extract prepared above to the Erlenmeyer flask and shake well. Place the Erlenmeyer flask on a 30℃ constant temperature stirrer and stir for 5 hours. Remove the flask and filter it with medium-speed quantitative filter paper to obtain the filtrate. Finally, send the filtrate to the sample and test the content of available silicon. No silicon was detected.
[0080] Comparative Example 5
[0081] After washing and air-drying the quartz sand, it was filled into a PVC column, with the filling height controlled at 5cm. Potassium dihydrogen phosphate fertilizer (P2O5≥50%, K2O≥33.2%, purity≥96%) was weighed and mixed evenly with 100g of soil, designated as the KP group. The available phosphorus content in the soil was controlled at 80mg / kg. The mixed soil was then filled into the PVC column, and finally, 2cm of quartz sand was filled on top of the mixed soil. After the sand column was filled, natural rainfall was simulated according to the set time. 100mL of deionized water was added to the sand column on days 0, 1, 3, 5, and 7, respectively. The leachate at the bottom of the column was collected in a beaker, and the phosphate content in the leachate was detected. The cumulative leaching rates were 2.48%, 4.96%, 6.96%, 8.67%, and 11.15%, respectively.
[0082] Comparative Example 6
[0083] Weigh 5g of soil sampled and sieved from farmland into a crucible, and add 80mL of a mixed acid solution of nitric acid, perchloric acid, and hydrofluoric acid in a volume ratio of 5:1:2. Heat at 120°C until no obvious particles are visible, and continue heating at 160°C until no white smoke is emitted. After cooling, add 2mL of 2mol / L hydrochloric acid solution to rinse the inner wall of the crucible, dissolve it by warming, and after cooling to room temperature, transfer it to a 50mL volumetric flask and make up to volume. Use ICP-MS to detect the cadmium solubility, and the cadmium solubility was found to be 0.12mg / kg.
[0084] Example 9
[0085] After washing and air-drying the quartz sand, it was filled into a PVC column, with the filling height controlled at 5cm. M-BT@CaAl-LDH material with adsorbed phosphorus was weighed and mixed evenly with 100g of soil, designated as the phosphorus-containing calcium-aluminum hydrotalcite loading material group (PM-BT@CaAl-LDH, Ca-P). The available phosphorus content in the soil was controlled at 80mg / kg. The mixed soil was then filled into the PVC column, and finally, 2cm of quartz sand was filled on top of the mixed soil. After the sand column was filled, natural rainfall was simulated at set times. 100mL of deionized water was added to the sand column on days 0, 1, 3, 5, and 7. The leachate at the bottom of the column was collected in a beaker, and the phosphate content in the leachate was measured. The cumulative leaching rates were 2.00%, 4.60%, 7.20%, 9.80%, and 12.99%, respectively. The final effect was better than that of the commercial phosphate fertilizer group in Comparative Example 5, indicating that the M-BT@CaAl-LDH material with adsorbed phosphorus can be used as a phosphate fertilizer for soil.
[0086] Example 10
[0087] After washing and air-drying the quartz sand, it was filled into a PVC column, with the filling height controlled at 5cm. A certain amount of phosphorus-adsorbed M-BT@MgAl-LDH material was weighed and mixed evenly with 100g of soil, which was set as the phosphorus-containing magnesium aluminum hydrotalcite loading material group (PM-BT@MgAl-LDH, Mg-P). The available phosphorus content in the soil was controlled at 80mg / kg. The mixed soil was then filled into the PVC column, and finally, 2cm of quartz sand was filled on top of the mixed soil. After the sand column was filled, natural rainfall was simulated according to the set time. 100mL of deionized water was added to the sand column on days 0, 1, 3, 5, and 7, and the leachate at the bottom of the column was collected in a beaker. The phosphate content in the leachate was detected. The cumulative leaching rates were 2.48%, 4.96%, 7.44%, 9.92%, and 12.51%, respectively. The final effect was better than that of the commercial phosphate fertilizer group in Comparative Example 5, indicating that the phosphorus-adsorbed M-BT@MgAl-LDH material can be used as a phosphate fertilizer for soil.
[0088] Example 11
[0089] The soil sample was taken from the same batch of farmland as in Comparative Example 6. Quartz sand was washed, air-dried, and then filled into a PVC column, with the filling height controlled at 5 cm. A certain amount of M-BT@CaAl-LDH material was weighed and mixed evenly with 100g of soil. This mixed soil was then filled into the PVC column, and finally, 2cm of quartz sand was placed on top of the mixed soil. Deionized water was applied periodically to maintain the soil moisture content at approximately 60% of the maximum moisture content. After 15 days, the soil was dried and sampled. 5g of the air-dried mixed soil sample was weighed and placed in a 25mL Erlenmeyer flask. 10.0mL of 0.005mol / L DTPA extraction solution (diethylenetriaminepentaacetic acid-calcium chloride-triethanolamine buffer extract, with a molar ratio of diethylenetriaminepentaacetic acid:calcium chloride:triethanolamine = 1:2:20) was added, and the flask was tightly sealed. The flask was shaken at 20°C and 200 rpm for 2 hours. After centrifugation, the concentration of cadmium extracted from the soil by DTPA was determined using inductively coupled plasma atomic emission spectrometry. The cadmium content was reduced by 56.88% compared with Comparative Example 6.
[0090] Comparative Example 7
[0091] A heavy metal adsorbent material was prepared according to the method of Example 1 of patent CN117504813A.
[0092] Weigh 0.4 g of adsorbent material into an Erlenmeyer flask, add 100 ml of 100 mg / L phosphate solution, and place it in a constant temperature shaker at 25℃ and 150 rpm for adsorption reaction. After 2 h of adsorption, take a sample and detect the phosphate concentration. The phosphate removal rate is 85% and the adsorption capacity is 19.25 mg / g.
[0093] The effect of different ratios of black talc and calcium aluminum hydrotalc on the removal rate is as follows: Figure 1 .
[0094] The effect of different ratios of black talc and magnesium aluminum hydrotalc on the removal rate is as follows: Figure 2 .
[0095] Weigh 0.1 g of the adsorbent material (M-BT@CaAl-LDH) from Example 1 into an Erlenmeyer flask, add 100 ml of 200 mg / L phosphate solution, and set the pH to 2, 4, 6, 8, 10, and 12. The effect of M-BT@CaAl-LDH on phosphorus removal rate at different pH values is as follows: Figure 3 .from Figure 3 It can be seen that M-BT@CaAl-LDH maintains a phosphorus removal rate of over 90% within a pH range of 4.0-10.0, demonstrating good acid and alkali adaptability.
[0096] 0.4 g of the adsorbent material (M-BT@MgAl-LDH) from Example 2 was weighed into an Erlenmeyer flask, and 100 ml of 100 mg / L phosphate solution was added. The pH values were 2, 4, 6, 8, 10, and 12. The effect of M-BT@MgAl-LDH on phosphorus removal rate at different pH values is shown below. Figure 4 .from Figure 4 It can be seen that M-BT@MgAl-LDH maintains a phosphorus removal rate of over 90% within a pH range of 4.0-10.0, demonstrating good acid-base adaptability. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
[0097] Figure 5 Table 1 shows a comparison of the cumulative leaching rates of phosphate fertilizer in Examples 9, 10, and 5. The cumulative leaching rate data for phosphate fertilizer in Examples 9, 10, and 5 are also shown in Table 1.
[0098] Table 1
[0099]
Claims
1. A method for preparing a black talc-loaded hydrotalcite functional material, characterized in that, Includes the following steps: (1) Preparation of black talc powder: dry ball mill the black talc and pass it through a 100-200 mesh sieve; (2) Solution preparation: Take divalent metal salt and trivalent metal salt, dissolve them separately in deionized water to obtain trivalent metal salt solution and divalent metal salt solution, mix the two to obtain solution A; prepare an alkaline solution of 1~5 mol / L, the resulting solution is solution B; (3) Preparation of functional materials: Add the black talc powder to liquid A and stir to disperse it. Add liquid B dropwise under stirring, control the pH to 9-12. After adding, let the solution stand for 10-30 minutes. Filter the solution after aging to obtain the required solid filter residue. Wash with water three times, dry at 50-90℃ for 2-3 hours, grind and sieve through 100 mesh to obtain the functional material.
2. The preparation method of the black talc-loaded hydrotalcite functional material according to claim 1, characterized in that, The mechanical dry ball milling time in step (1) is 2~4 hours and the rotation speed is 100~300 rpm.
3. The preparation method of the black talc-loaded hydrotalcite functional material according to claim 1, characterized in that, The divalent metal salt in step (2) is at least one of CaCl2, MgCl2, ZnCl2, Ca(NO3)2, ZnSO4, and MgSO4; the trivalent metal salt is at least one of AlCl3, FeCl3, Fe(NO3)3, Al(NO3)3, and Fe2(SO4)3.
4. The preparation method of the black talc-loaded hydrotalcite functional material according to claim 1, characterized in that, In step (2), the molar concentration of trivalent metal ions in the trivalent metal salt solution is 0.08~0.12 mol / L, and the molar concentration of divalent metal ions in the divalent metal salt solution is 0.1~0.4 mol / L; the molar ratio of trivalent metal ions to divalent metal ions in solution A is 1:1~1:
6.
5. The preparation method of the black talc-loaded hydrotalcite functional material according to claim 1, characterized in that, The ratio of black talc powder to liquid A in step (3) is 1~3g:200mL.
6. A functional material of black talc loaded with hydrotalcite, characterized in that, The black talc-loaded hydrotalc functional material is prepared according to any one of claims 1-5.
7. An application of the black talc-loaded hydrotalcite functional material according to claim 6, characterized in that, The functional material is used to adsorb phosphorus in water, and the adsorbed phosphorus is used as a phosphorus-silicon fertilizer and for the fixation of heavy metals.
8. The application of the black talc-loaded hydrotalc functional material according to claim 7, characterized in that, The method for adsorbing phosphorus from water is as follows: the adsorbent material is placed in a solution containing phosphate and stirred for adsorption to obtain the black talc-loaded hydrotalc functional material.
9. The application of the black talc-loaded hydrotalc functional material according to claim 8, characterized in that, The concentration of phosphate in the phosphate-containing solution is 100~200 mg / L; The temperature for the stirring adsorption is 20-25℃, the adsorption time is 2-2.5h, and the stirring speed is 100-150rpm.