Lanthanum modified kaolin phosphorus removal agent as well as preparation method and application thereof
A kind of soil phosphorus removal agent and kaolin technology, applied in the field of lanthanum modified kaolin phosphorus removal agent and its preparation, can solve the problems of limited adsorption efficiency, can not meet the standard of direct discharge, etc., achieve long preparation period, short period and high efficiency Effect
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Embodiment 1
[0046] (1) Mix 10g of kaolin and 100mL of 0.2mol / L LaCl 3 The solutions were mixed and stirred for 20 minutes at a stirring rate of 300r / min;
[0047] (2) Add 2.5g of NaOH to the mixed solution of step (1), stir for 30 minutes, and the stirring rate is 600r / min;
[0048] (3) After adjusting the pH of the solution in step (2) to 10 with 0.01mol / L NaOH solution, stir for 180 minutes at a stirring rate of 600r / min, and then ultrasonically for 30 minutes;
[0049] (4) The product obtained in step (3) was filtered and washed 3 times with ultrapure water, then dried at 120° C. for 5 hours, and ground for 10 minutes;
[0050] (5) The product obtained in step (4) was filtered and washed with ultrapure water for 3 times, then dried at 105° C. for 3 hours, and ground for 30 minutes; the lanthanum-modified kaolin phosphorus removal agent was obtained. This lanthanum-modified kaolin is abbreviated as KL-NaOH-La below, and the unmodified kaolin is abbreviated as KL;
[0051] Add 1g / L so...
Embodiment 2
[0053] (1) Mix 10g of kaolin and 100mL of 0.2mol / L LaCl 3 The solutions were mixed and stirred for 20 minutes at a stirring rate of 500r / min;
[0054] (2) After adjusting the pH of the solution in step (1) to 10 with 0.01mol / L NaOH solution, stir for 180 minutes at a stirring rate of 800r / min, and then ultrasonically for 30 minutes;
[0055] (3) The product obtained in step (2) was filtered and washed 3 times with ultrapure water, then dried at 120° C. for 5 hours, and ground for 10 minutes;
[0056] (4) The product obtained in step (3) was filtered and washed three times with ultrapure water, then dried at 105° C. for 3 hours, and ground for 30 minutes to obtain a lanthanum-modified kaolin phosphorus removal agent. This kind of kaolin modified by lanthanum without adding a large amount of NaOH is abbreviated as KL-La below;
[0057] Add 1g / L soil amount to 200mL potassium dihydrogen phosphate solution, the solution concentration is 10mg / L, put it at room temperature for sta...
Embodiment 3
[0060] The experiment of the adsorption effect of lanthanum modified kaolin phosphorus removal agent with time;
[0061] The preparation of material is with embodiment 1 and example 2;
[0062] Add 1g / L of soil to 200mL of potassium dihydrogen phosphate solution, the solution concentration is 10mg / L, put it at room temperature for static adsorption, and measure the remaining phosphorus concentration in the solution at regular intervals. Experimental results such as Figure 4 It is shown that when the initial phosphorus concentration is 10mg / L, the adsorption rate of KL-NaOH-La to phosphorus is as high as 99% within 72h, which has an obvious effect of adsorbing phosphorus. The remaining phosphorus concentration reaches the direct discharge standard of "Environmental Quality Standards for Surface Water" (GB 3838-2002). It shows the excellent phosphorus removal effect of lanthanum modified kaolin phosphorus removal agent.
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Abstract
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