A magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorption material, a preparation method and application thereof
By constructing a magnetic iron-cobalt-nickel layered trimetallic hydroxide on the surface of feldspar, forming an interlaced three-dimensional nanosheet array structure, the problem of insufficient adsorption capacity of feldspar adsorbent materials is solved, achieving efficient removal of organic pollutants from water and reducing treatment costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LIAONING UNIVERSITY
- Filing Date
- 2026-04-10
- Publication Date
- 2026-06-09
AI Technical Summary
Existing feldspar adsorbent materials have limited adsorption capacity when removing organic pollutants from water, and their preparation is complex and costly, making it difficult to effectively remove organic pollutants such as doxycycline hydrochloride.
A hydrothermal method was used to construct a layered trimetallic hydroxide of iron, cobalt, and nickel on the surface of feldspar, forming an interlaced three-dimensional nanosheet array structure, which enhanced chemical bonding and increased the number of adsorption sites and chemical activity.
It significantly improves the adsorption effect of feldspar materials on organic pollutants such as doxycycline hydrochloride, acridine orange, and methylene blue, reduces treatment costs, and endows the materials with magnetism to facilitate separation and recycling.
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Figure CN122164355A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of environmental engineering technology, specifically relating to a magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material, its preparation method, and its application. Background Technology
[0002] In recent years, global antibiotic consumption has been increasing. Doxycycline hydrochloride, a broad-spectrum antibiotic, is widely used to treat bacterial infections and wound inflammation in humans and animals. Due to its high lipid solubility, stable chemical structure, and inhibitory effect on microbial activity, doxycycline hydrochloride is difficult to biodegrade in water. Under existing wastewater treatment processes, conventional biochemical treatment is insufficient to completely degrade doxycycline in water. Therefore, incompletely decomposed doxycycline hydrochloride enters groundwater, surface water, and soil in its original form or as metabolites, seriously harming the environment. Consequently, doxycycline hydrochloride gradually accumulates in natural water bodies and bioaccumulates through the food chain, posing a serious threat to human and other biological health.
[0003] Adsorption is considered a highly efficient technology for treating organic pollutants in water and wastewater due to its high efficiency, low cost, wide adaptability, and environmental friendliness. Therefore, finding a highly efficient and effective adsorbent material is crucial. Currently, feldspar has been reported to show potential in removing ammonium salts and heavy metals from water. However, the adsorption capacity of natural feldspar is limited by its small specific surface area, underdeveloped pore structure, and few surface active sites, thus limiting its performance in practical applications. Current research focuses on modifying feldspar using surfactants, metal ions, and metal oxides. In this invention, feldspar is modified with iron-cobalt-nickel trimetallic hydroxide (FCH). FCH itself has a layered hydrotalcite structure, with its layers "embedded" on the feldspar surface, forming an interwoven three-dimensional nanosheet array structure. This facilitates a tighter bond between the MO (M=Fe, Co, Ni), -OH, and C=O groups in the trimetallic hydroxide and the -OH, Al-O, Si-O, and Al-O-Si functional groups in the feldspar, forming stronger chemical bonds and increasing the number and strength of coordination bonds and hydrogen bonds. Modification with iron-cobalt-nickel layered trimetallic hydroxides enhances the chemical activity of feldspar surfaces, effectively increasing the number of adsorption sites and adsorption capacity. Furthermore, it alters the feldspar surface potential, which is beneficial for improving the adsorption of organic pollutants. Summary of the Invention
[0004] The purpose of this invention is to provide a method for preparing a magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material, thereby improving the adsorption performance of feldspar and solving the problems of low removal rate, limited quantity, complex preparation, and high preparation cost of existing organic matter removal adsorbent materials. To achieve the above objective, the technical solution adopted by this invention is: a magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material, wherein the chemical formula of the magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material is [Ni 0.33 Co 0.33 Fe 0.33 [(OH)2](CO3) 0.17 ·mH2O / CaAl2Si2O8, where m is 0.5-4.0, and the specific surface area is 45-60 m². 2 / g, total pore volume is 0.136-0.141 cm³. 2 / g.
[0005] The preparation method of the above-mentioned magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material includes the following steps: first, Fe(NO3)3·9H2O, Co(NO3)2·6H2O and Ni(NO3)2·6H2O are dissolved in deionized water and stirred until completely dissolved to obtain a mixed solution; then, appropriate amounts of feldspar and urea are added to the mixed solution in sequence, and stirring is continued. The resulting mixture is transferred to a high-pressure reactor for hydrothermal reaction. After the reaction is completed and cooled to room temperature, it is washed until neutral, vacuum dried and thoroughly ground to obtain the magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material.
[0006] In the above preparation method, the molar ratio of Fe(NO3)3·9H2O, Co(NO3)2·6H2O, and Ni(NO3)2·6H2O is according to Fe 3+ :Co 2+ :Ni 2+ =1:1:0-3, the total concentration of the three metal ions in the solution is 0.15 mol / L.
[0007] In the above preparation method, the solid-liquid ratio of feldspar in the mixed solution is 0.05-0.10 g / mL.
[0008] In the above preparation method, the pH of the mixed solution is adjusted to 10.0 after the addition of urea.
[0009] In the above preparation method, the hydrothermal reaction temperature and time are 160 °C and 16 h, respectively.
[0010] The above-mentioned magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material is used in the removal of organic pollutants from wastewater.
[0011] In the above applications, the organic compounds are doxycycline hydrochloride, methylene blue, and acridine orange.
[0012] The above application is carried out as follows: Iron-cobalt-nickel trimetallic layered hydroxide modified feldspar adsorbent material is added to wastewater containing organic pollutants, and adsorption is carried out by stirring at room temperature and pH 3-9.
[0013] In the above application, the initial concentration of the organic pollutant in the wastewater is 20 mg / L, and the amount of iron-cobalt-nickel trimetallic layered hydroxide modified feldspar adsorbent material added is 1.0-1.5 g / L.
[0014] The beneficial effects of this invention are:
[0015] 1. This invention utilizes a hydrothermal method to construct layered trimetallic hydroxides on the surface of feldspar. These trimetallic hydroxides, with their layered, hydrotalcite-like structure, can be "embedded" into the feldspar surface, forming an interlaced three-dimensional nanosheet array structure. This facilitates a tighter bond between the MO (M=Fe, Co, Ni), -OH, and C=O groups in the trimetallic hydroxides and the -OH, Al-O, Si-O, and Al-O-Si functional groups in the feldspar, forming stronger chemical bonds and increasing the number and strength of coordination and hydrogen bonds. Modification with iron-cobalt-nickel layered trimetallic hydroxides enhances the chemical activity of the feldspar surface, effectively increasing the number of adsorption sites and its adsorption capacity. After modification with iron-cobalt-nickel layered trimetallic hydroxides, the surface potential of the feldspar can be altered, which is beneficial for improving the adsorption effect on organic pollutants.
[0016] 2. This invention has determined the optimal molar ratio of feldspar modified with iron-cobalt-nickel trimetallic layered hydroxides, and the adsorption performance is far superior to that of feldspar modified with iron-cobalt and cobalt-nickel bimetallic layered hydroxides, proving the superiority of the iron-cobalt-nickel trimetallic modification method.
[0017] 3. The magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar prepared in this invention is beneficial for adsorbing doxycycline hydrochloride, acridine orange and methylene blue.
[0018] 4. The method for preparing magnetic iron-cobalt-nickel trimetallic hydroxide-modified feldspar described in this invention is simple, has low synthesis cost, and possesses high adsorption capacity, thus improving wastewater treatment efficiency. Furthermore, the modification with iron-cobalt-nickel trimetallic hydroxide imparts magnetism to the feldspar, facilitating separation and recovery, thereby reducing wastewater treatment costs. Attached Figure Description
[0019] Figure 1 This is the FT-IR spectrum of natural feldspar adsorbent material.
[0020] Figure 2 The image shows the FT-IR spectrum of a magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material.
[0021] Figure 3 This is the SEM image of a natural feldspar adsorbent material.
[0022] Figure 4 This is the SEM image of a magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material. Detailed Implementation
[0023] A magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material was prepared by hydrothermal method. The magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar should possess the following characteristics; its chemical formula is [Ni 0.33 Co 0.33 Fe 0.33 [(OH)2](CO3) 0.16 ·mH2O / CaAl2Si2O8, where m is 0.5-4.0, has a three-dimensional nanosheet array structure on its surface.
[0024] The specific preparation method of the above-mentioned magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material includes the following steps:
[0025] 1. According to Fe 3+ Co 2+ Ni 2+ With a molar ratio of 1:1:1 and a total concentration of three metal ions of 0.15 mol / L, a certain mass of Fe(NO3)3·9H2O, Co(NO3)2·6H2O and Ni(NO3)2·6H2O were dissolved in deionized water and mixed evenly. Then, feldspar powder was added to the above solution at a solid-liquid ratio of 0.05 g / 1 mL and mixed evenly. Urea was then added to the solution, and the pH was maintained at 10.0.
[0026] 2. The obtained mixture was transferred to a stainless steel autoclave lined with polytetrafluoroethylene and hydrothermally treated at 160°C in a vacuum oven for 16 hours. After the reaction was completed and cooled to room temperature, the obtained sample was washed with deionized water until neutral, vacuum dried and thoroughly ground, and then stored in a sample bottle for later use, thus obtaining a magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material.
[0027] The above-mentioned magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material is used in the removal of organic pollutants from wastewater.
[0028] Furthermore, the above application is specifically implemented as follows: magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material is added to wastewater containing 20 mg / L organic pollutants, and stirred on a magnetic stirrer at room temperature for 30.0 min.
[0029] Furthermore, in the above applications, the organic pollutants include doxycycline hydrochloride, methylene blue, and acridine orange.
[0030] Example 1: Hydrothermal Synthesis of Magnetic Iron-Cobalt-Nickel Layered Trimetallic Hydroxide Modified Feldspar Adsorbent Material
[0031] (a) Preparation method, including the following steps:
[0032] 0.4040 g Fe(NO3)3·9H2O, 0.2910 g Co(NO3)2·6H2O, and 0.2908 g Ni(NO3)2·6H2O were dissolved in 20.0 mL of deionized water and stirred continuously for 30.0 min. Then, 1.0 g feldspar was added to the mixture and stirred continuously for 30.0 min. Next, 0.4204 g urea was added and mixed thoroughly to bring the pH of the solution to 10.0. The resulting 20.0 mL mixture was transferred to a polytetrafluoroethylene-lined autoclave and subjected to solvothermal reaction at 160 ℃ for 16.0 h. After the reaction was complete and cooled to room temperature, the suspension was poured off, centrifuged, washed with deionized water until neutral, vacuum dried, and ground to obtain a magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material [Ni 0.33 Co 0.33 Fe 0.33 [(OH)2](CO3) 0.17 The specific surface area of the magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material is 45-60 m² / CaAl₂Si₂O₈, where m is 0.5-4.0. 2 / g, total pore volume is 0.136-0.141 cm³. 2 / g.
[0033] (ii) Characterization
[0034] 1. Figure 1 shows the FT-IR spectrum of the feldspar adsorbent material. As can be seen from Figure 1, in the infrared spectrum of feldspar, the adsorbent is located at 3400 cm⁻¹. -1 and 1600 cm -1 The absorption peaks at 1100 cm⁻¹ represent the OH bond vibrations of the water adsorbed in the material. -1 The nearby absorption peak corresponds to the Si-O stretching vibration of feldspar, at 790 cm⁻¹. -1 The nearby absorption peaks represent the bending vibrations of Si-O-Al and Si-O-Si, respectively.
[0035] 2. Figure 2 shows the FT-IR spectrum of the magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material. As can be seen from Figure 2, in the infrared spectrum of the magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar, the adsorbent at 3400 cm⁻¹... -1and 1600 cm -1 The absorption peak at 1100 cm⁻¹ represents the vibration of OH bonds in the water adsorbed by the material. -1 The nearby absorption peaks are due to the vibrations of Si-O in feldspar, 560 ~ 670 cm⁻¹. -1 The peak corresponds to the Co-O bond vibration, 460 ~ 580 cm⁻¹. -1 The absorption peak is due to the Fe-O vibration, at 440 cm⁻¹. -1 The nearby absorption peaks are due to the bending vibrations of Ni-O.
[0036] 3. Figure 3 is the SEM image of the feldspar adsorbent material. As can be seen from Figure 3, the feldspar is mainly composed of multiple layers of irregular lamellar structures, and the arrangement and distribution are uneven.
[0037] 4. Figure 4 is a SEM image of the feldspar adsorbent material modified with magnetic iron-cobalt-nickel layered trimetallic hydroxide. As can be seen from Figure 4, after the feldspar is modified with trimetallic hydroxide, the layered hydrotalcite structure inherent in the trimetallic hydroxide itself is "embedded" on the feldspar surface, forming an interlaced three-dimensional nanosheet array structure.
[0038] Example 2: Application of magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar in adsorbing organic pollutants in wastewater.
[0039] The method for adsorbing organic pollutants in wastewater using magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material is as follows: Add the magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material to the wastewater containing doxycycline hydrochloride. Stir the material on a magnetic stirrer at room temperature for 30.0 min, then measure the absorbance of doxycycline hydrochloride and calculate the adsorption rate of the magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material for doxycycline hydrochloride.
[0040] Q = (C0-C e ) / C0×100%(1)
[0041] Where Q: adsorption rate, %
[0042] C0: Initial concentration of doxycycline hydrochloride in the reaction system, mg / L;
[0043] C e : The concentration of doxycycline hydrochloride in the filtrate after adsorption equilibrium, in mg / L.
[0044] (I) Comparison of the performance of feldspar and magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent materials
[0045] Adsorption method: 0.02 g of feldspar and the prepared magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent were weighed out at a dosage of 1.0 g / L and placed in two 50.0 mL Erlenmeyer flasks. 20.0 mL of a doxycycline hydrochloride solution with pH 4.0 and an initial concentration of 20 mg / L was transferred. After reacting for 30.0 min, the absorbance of the supernatant containing doxycycline hydrochloride was measured, and the adsorption rate of the adsorbent material for doxycycline hydrochloride was calculated.
[0046] Table 1. Adsorption rates of feldspar and magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbents for doxycycline hydrochloride.
[0047] Adsorbent Adsorption rate (%) Feldspar 56.2 Magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar 95.57
[0048] As shown in Table 1, the adsorption rate of feldspar for doxycycline hydrochloride was 56.2%, while the adsorption rate of the magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material for doxycycline hydrochloride was 95.57%. Therefore, the adsorption performance of the modified feldspar was significantly enhanced.
[0049] Preparation methods of feldspar modified with different iron-cobalt-nickel molar ratios: Referring to Example 1, the concentrations of Fe(NO3)3·9H2O and Co(NO3)2·6H2O were kept at 0.05 mol / L, and the concentration of Ni(NO3)2·6H2O was changed accordingly, so that the iron-cobalt-nickel molar ratios in the precursor solution were 1:1:0, 1:1:0.5, 1:1:1, 1:1:2, and 1:1:3, respectively. The solution was then transferred to a hydrothermal reactor for solvothermal synthesis. After the reaction was completed and cooled to room temperature, the suspension was poured off, centrifuged, washed with deionized water until neutral, vacuum dried, and ground to obtain layered trimetallic hydroxide modified feldspar adsorbent materials with the corresponding iron-cobalt-nickel molar ratios. In addition, referring to Example 1, feldspar modified with iron-nickel and cobalt-nickel layered bimetallic hydroxides with iron-cobalt-nickel molar ratios of 1:0:1 and 0:1:1, respectively, without Fe(NO3)3·9H2O and Co(NO3)2·6H2O, were synthesized and compared with the feldspar modified with magnetic iron-cobalt-nickel layered trimetallic hydroxides proposed in this invention in terms of adsorption capacity.
[0050] Adsorption method: At a dosage of 1.0 g / L, 0.02 g of unmodified feldspar and layered trimetallic hydroxide-modified feldspar adsorbents with different iron-cobalt-nickel molar ratios were weighed into seven 50.0 mL Erlenmeyer flasks. 20 mL of a 20 mg / L doxycycline hydrochloride solution was then transferred to each flask. After reacting for 30.0 min, the absorbance of the supernatant was measured, and the adsorption rate of the adsorbent for doxycycline hydrochloride was calculated.
[0051] Table 2. Effect of layered trimetallic hydroxide modified feldspar adsorbents with different iron-cobalt-nickel molar ratios on the adsorption rate of doxycycline hydrochloride solution.
[0052] Iron-cobalt-nickel molar ratio Adsorption rate (%) 1：1：0 72.3 1：0：1 90.3 0：1：1 77.5 1：1：0.5 75.3 1：1：1 95.57 1：1：2 87.0 1：1：3 73.2
[0053] As shown in Table 2, with the change of the molar ratio of the three metals (iron, cobalt, and nickel), the adsorption performance of the feldspar adsorbent material modified with iron-cobalt-nickel layered trimetallic hydroxide for doxycycline hydrochloride first increases and then decreases. The modified feldspar exhibits the best adsorption performance when the iron-cobalt-nickel ratio of the trimetallic layered hydroxide is 1:1:1, and is significantly better than that modified with iron-cobalt, iron-nickel, or nickel-cobalt bimetallic layered hydroxides.
[0054] (II) The effect of different pH values on wastewater containing adsorbed organic pollutants
[0055] Adsorption method: 0.02 g of the iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material prepared in Example 1 was weighed and placed in five 50.0 mL Erlenmeyer flasks at a dosage of 1.0 g / L. 20 mL of doxycycline hydrochloride solution with a mass concentration of 20 mg / L and pH values of 3.0, 5.0, 7.0, 9.0, and 11.0 were transferred. After reacting for 30.0 min, the absorbance of the supernatant doxycycline hydrochloride was measured, and the adsorption rate (Q0) of the adsorbent material for doxycycline hydrochloride was calculated according to formula (1).
[0056] Table 3. Effect of iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent on the adsorption rate of doxycycline hydrochloride solution at different pH values.
[0057] pH of doxycycline hydrochloride solution Adsorption rate (%) 3.0 76.35 4.0 95.57 5.0 59.09 7.0 66.23 9.0 58.41 11.0 20.56
[0058] As shown in Table 3, the adsorption of doxycycline hydrochloride by the iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material first increased and then decreased as the solution pH increased from 3.0 to 11.0. The adsorption of doxycycline hydrochloride reached its maximum at pH = 4.0.
[0059] (III) Adsorption rates of different pollutants by iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent materials
[0060] Adsorption method: 0.02 g of the iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material prepared in Example 1 was weighed at a dosage of 1.0 g / L and placed in four 50 mL Erlenmeyer flasks. 20 mL of solutions of doxycycline hydrochloride, acridine orange, and methylene blue (pH 4.0, mass concentration 20 mg / L) were transferred to each flask. After reacting for 30.0 min, the absorbance of doxycycline hydrochloride, acridine orange, and methylene blue in the supernatant was measured, and the adsorption rates (Q0) of the adsorbent material for doxycycline hydrochloride, acridine orange, and methylene blue were calculated.
[0061] Table 4. Adsorption rates of different pollutants by iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent materials.
[0062] Types of organic pollutants Adsorption rate (%) Doxycycline hydrochloride 95.57 Acridine Orange 98.78 Methylene blue 88.81
[0063] As shown in Table 4, the modified feldspar exhibits high adsorption rates for doxycycline hydrochloride, acridine orange, and methylene blue. This is because the iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material can form relatively stable complexes when adsorbing doxycycline hydrochloride, acridine orange, and methylene blue.
Claims
1. A magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material, characterized in that, The chemical formula of the magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material is [Ni 0.33 Co 0.33 Fe 0.33 [(OH)2](CO3) 0.17 ·mH2O / CaAl2Si2O8, where m is 0.5-4.0, and the specific surface area is 45-60 m². 2 / g, total pore volume is 0.136-0.141 cm³. 2 / g.
2. The preparation method of the magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material according to claim 1, characterized in that, The process includes the following steps: First, Fe(NO3)3·9H2O, Co(NO3)2·6H2O and Ni(NO3)2·6H2O are dissolved in deionized water and stirred until completely dissolved to obtain a mixed solution; then, appropriate amounts of feldspar and urea are added to the mixed solution in sequence, and stirring is continued. The resulting mixture is transferred to a high-pressure reactor for hydrothermal reaction. After the reaction is completed and cooled to room temperature, it is washed until neutral, vacuum dried and thoroughly ground to obtain a magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material.
3. The preparation method according to claim 2, characterized in that, The molar ratio of Fe(NO3)3·9H2O, Co(NO3)2·6H2O, and Ni(NO3)2·6H2O is based on Fe 3+ :Co 2+ :Ni 2+ =1:1:0-3, the total concentration of the three metal ions in the solution is 0.15 mol / L.
4. The preparation method according to claim 2, characterized in that, The solid-liquid ratio of feldspar in the mixed solution is 0.05-0.10 g / mL.
5. The preparation method according to claim 2, characterized in that, After adding urea, the pH of the mixed solution was adjusted to 10.
0.
6. The preparation method according to claim 2, characterized in that, The hydrothermal reaction temperature and time were 160℃ and 16 h, respectively.
7. The application of the magnetic iron-cobalt-nickel layered trimetallic hydroxide modified feldspar adsorbent material as described in claim 1 in the removal of organic pollutants from wastewater.
8. The application according to claim 7, characterized in that, The organic compounds are doxycycline hydrochloride, methylene blue, and acridine orange.
9. The application according to claim 7, characterized in that, The method is as follows: Add iron-cobalt-nickel trimetallic layered hydroxide modified feldspar adsorbent material to wastewater containing organic pollutants, and stir and adsorb at room temperature and pH 3-9.
10. The application according to claim 9, characterized in that, The initial concentration of the organic pollutant in the wastewater is 20 mg / L, and the amount of iron-cobalt-nickel trimetallic layered hydroxide modified feldspar adsorbent material added is 1.0-1.5 g / L.