A kind of magnetic quaternary zn-al-fe-la hydrotalcite and its preparation method and application
A hydrotalcite and magnetic technology, applied in the field of phosphorus adsorption materials, can solve the problems of poor regeneration and recycling capacity, poor phosphorus adsorption capacity and high cost
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Embodiment 1
[0057] 1. Preparation of binary and ternary hydrotalcites
[0058] Choose from 4 different M 2+ (Mg 2+ , Zn 2+ , Ca 2+ , Mn 2+ ) and 2 kinds of M 3+ (Al 3+ , Fe 3+ ), in M 2+ : M 3+ = Under the ratio of 2:1, accurately weigh a certain mass of MgCl 2 ·6H 2 O, ZnCl 2 , CaCl 2 , MnCl 2 4H 2 O, AlCl 3 ·6H 2 O and Fe 2 (SO 4 ) 3 Prepared as a mixed metal salt solution, where Al 3+ The concentration is 0.25mol / L. Prepare an alkaline solution with a concentration of 20 wt% with NaOH. Take the co-precipitation method, under vigorous stirring, add the metal salt solution and the alkali solution dropwise into the beaker filled with distilled water at the same time, under the condition of an ultrasonic water bath at 70°C, slowly add 20% NaOH solution until the pH = 9, continue stirring after the titration is completed 30min. Then the precipitate was crystallized at 70°C for 18h, and then washed with distilled water several times until the supernatant was neutral, f...
Embodiment 2
[0070] The preparation method of magnetic quaternary hydrotalcite is the same as in Example 1, wherein, the difference is:
[0071] 1. Heat drying + co-precipitation: under the condition of 70°C water bath, slowly add 20% NaOH solution until pH = 9, and continue to stir for 30 minutes after the titration is completed. Then the precipitate was crystallized at 70°C for 18h, washed with distilled water several times until the supernatant was neutral, and finally heat-dried at 70°C for 48h to obtain the product.
[0072] 2. Ultrasound + co-precipitation + freeze-drying: in a water bath assisted by ultrasound (500W, 100KHz, time 30min) at 70°C, slowly add 20% NaOH solution until pH = 9, and continue stirring for 30min after the titration is completed. Then the precipitate was crystallized at 70°C for 18h, washed with distilled water several times until the supernatant was neutral, and finally freeze-dried at -30°C for 48h to obtain the product.
[0073] Determination of the adsorp...
Embodiment 3
[0080] Using the magnetic Zn-Al-Fe-La-like hydrotalcite prepared in Example 2 by ultrasonication + co-precipitation + freeze-drying as the material, phosphorus adsorption test was carried out, and the adsorption test method was the same as above.
[0081] In the phosphorus adsorption test of magnetic quaternary hydrotalcite, add HCl or NaOH solution dropwise to adjust the pH of sewage to 2-12, the initial phosphorus concentration of the reaction is 200mg / L, and the dosage of adsorbent is 1g / L. Under the reaction conditions, by Figure 8 It can be seen that the phosphorus adsorption performance of hydrotalcite-like under acidic conditions is significantly better than that under alkaline conditions. The adsorption capacity reaches the highest when pH=4, and the adsorption capacity of phosphate decreases significantly when pH>6.
[0082] The initial phosphorus concentration of the reaction is 200mg / L, the dosage of the adsorbent is 1g / L, under the condition of pH=4, 24h reaction,...
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