Preparation method of hydrotalcite-like composite material for phosphorus recovery as well as product and application of composite material
The technology of a composite material and a production method is applied in the preparation of materials for the recycling of environmental protection pollutants, and in the field of products prepared by related methods, which can solve the problems of insufficient recycling and utilization of phosphorus elements, achieve low recovery costs, and ensure environmental protection. , the effect of high purity
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Embodiment 1
[0043] Fabrication of Hydrotalcite-like Porous Ceramic Sheets as Thin Films
[0044] 1. Use aluminum chloride hexahydrate and magnesium chloride hexahydrate as raw materials, and deionized water as solvent, weigh them according to the molar ratio of magnesium and aluminum ions at 3:1, and dissolve them in deionized water to prepare a solution to obtain a concentration of 3mmol / L Aluminum chloride solution, 9mmol / L magnesium chloride solution.
[0045] 2. Using urea as a precipitating agent, prepare urea into a solution with a concentration of 0.8mol / L; porous pottery as a carrier. Put a certain amount of prepared magnesium chloride solution and aluminum chloride solution into two separating funnels respectively, then put 80mL of urea solution into a three-necked flask in advance, add 200g of porous pottery, and prepare for titration.
[0046] 3. Under the conditions of the water bath temperature being 90 degrees Celsius and electromagnetic stirring, drop the magnesium chlor...
Embodiment 2
[0062] The present embodiment is similar to Example 1, and the main difference is: aluminum chloride hexahydrate and magnesium chloride hexahydrate are added dropwise to participate in the reaction. 1, 2:1, 3:1, 4:1, 5:1 and other different ratios, the influence of the modified hydrotalcite to form a composite intercalation structure, the results are shown in the table below.
[0063] Table 1
[0064] Numbering Molar ratio of magnesium to aluminum Adsorption capacity, mg / g Regeneration rate (%) 201 1:2 4.3 82 202 1:1 5.4 89 203 2:1 7.1 91 204 3:1 9.6 95 205 4:1 6.6 93 206 5:1 5.2 92
[0065] It can be seen from the above comparison test that in the preparation process of the modified hydrotalcite product prepared by the present invention for phosphorus adsorption, the control of the molar ratio of magnesium to aluminum ions affects the performance of the prepared product as follows: whether a stable layered structur...
Embodiment 3
[0067] This embodiment is similar to the method of Example 1 to prepare modified hydrotalcite, and carry out sewage adsorption. The phosphorus content of sewage is 100mg / L. Insert the prepared modified hydrotalcite sheet into sewage, let it stand for 20min, fully After adsorption, rinse with water to remove residual dirt on the surface for desorption experiments.
[0068] After absorbing phosphate, the hydrotalcite-like, under the condition of high pressure + excess carbon dioxide, fills the middle layer of the hydrotalcite-like with carbonate ions, and can decompose and enrich the phosphate. The desorption principle is as follows: image 3 shown.
[0069] During the desorption process, compare the effects of different carbon dioxide concentrations and pressures on the desorption, and respectively try the desorption effect of the carbon dioxide pressure in the range of 1Mpa to 3.5Mpa. It was found that when the pressure was from 1Mpa to 1.5Mpa, the desorption rate of phosphate...
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