A kind of alkali-modified attapulgite adsorbent and preparation method thereof
A technology of attapulgite and alkali modification, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, and can solve problems affecting adsorption performance and poor pore permeability.
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Embodiment 1
[0027] (1) Purification: the natural attapulgite is mechanically rolled, crushed, ground, passed through a 100-mesh sieve, and distilled water is added to make a suspension slurry, and then ultrasonically dispersed for 10 minutes, the lower sediment is discarded, and the upper suspension is retained The solution was centrifuged at a controlled speed of 4000r / min for 15min. Keep the precipitate and transfer it to a beaker for later use;
[0028] (2) Calcium hydroxide and lime are mixed at a mass ratio of 0.5:1 to obtain an alkali-modified mixture, that is, modifier B.
[0029] (3) Modification: Mix the purified attapulgite prepared in step (1) with the modifier prepared in step (2) in a ratio of 2:1 to obtain a mixture, and then add Mix with distilled water to make a suspended slurry, and keep stirring on a magnetic stirrer. After the addition is complete, continue to stir until the mixture is evenly mixed to obtain a mixed slurry;
[0030] (4) pH adjustment: under continuous...
Embodiment approach
[0035] (1) Prepare 1 g / L of cadmium ion solution and lead ion solution respectively, and then mix them to make a 500 mg / L mixed solution. Accurately measure 100ml of the mixed solution of six parts of lead ion and cadmium ion respectively, and put it into a 250ml volumetric flask
[0036] (2) Weigh 6 parts of alkali-modified attapulgite adsorbent materials, the masses are 0.025g, 0.05g, 0.1g, 0.15g, 0.2g, 0.25g respectively, put them into conical flasks, and oscillate at room temperature for 24h .
[0037] (3) After oscillating and absorbing, let it stand for 2 hours, take 20ml of supernatant, centrifuge at 4000r / min for 15min, and measure the concentration of heavy metal ions by the national standard method.
[0038] Example 1 Alkali-modified attapulgite adsorption material adsorption effect of heavy metals is shown in Table 1
[0039] Table 1
[0040]
[0041]
Embodiment 2
[0043] In order to obtain the alkali-modified attapulgite adsorbent material in improving acidic soil and restoring the biological characteristics of farmland, the acidic soil collected from the test in Xuyi County, Jiangsu Province was specially selected. The pH value of the original soil was between 4-5, which is very Acidic soil suitable for agricultural cultivation.
[0044] The production process of the alkali-modified attapulgite adsorption material for improving acidic soil is as follows:
[0045] (1) Add distilled water to the crushed attapulgite original soil at a mass ratio of 1:10, mix it into a slurry, and carry out ultrasonic dispersion for 10-15 minutes under constant stirring, discard the sediment, keep the suspension for centrifugation, and control the speed at 4000r / min, centrifuged for 15min to obtain mud A.
[0046](2) Modifier: mix calcium hydroxide and lime at a mass ratio of 1:1 to obtain an alkaline mixture, i.e. modifier B;
[0047] (3) Modification:...
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