Spherical manganese dioxide type lithium ionic sieve
A manganese dioxide type, lithium ion technology, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of difficult post-processing, difficult application, and easy bed collapse.
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[0033] Example 1
[0034] Under the conditions of 5℃~50℃ and normal pressure (1atm), weigh 4.00g polyvinyl chloride (polymerization degree: 1000±20) and dissolve it in 66ml NMP, and add 20.00g LiMn after dissolving evenly 2 O 4 After stirring the ultrafine powder, use a dropper with a diameter of 3mm to drop into 400ml deionized water, wash, and dry at 40-180℃ for 10-30 hours to obtain spherical LiMn 2 O 4 Type ion sieve precursor. The resulting spherical LiMn 2 O 4 Put 0.5mol·l -1 Soak in hydrochloric acid (H / Li=1.5, molar ratio) for 24 hours, wash in deionized water, and dry at 40-180°C for 10-30 hours to obtain spherical λ-MnO 2 (LiMn 2 O 4 H type) is denoted as SMO-a, the specific surface area (BET) of SMO-a is: 13.02m 2 ·G -1 , See the SEM image of the outer surface and cross section of SMO-a figure 1 .
Example Embodiment
[0035] Example 2
[0036] Weigh a series of quantitative SMO-a granular lithium ion sieves prepared in Example 1 and the corresponding powder ion sieves SMO-p1, and measure 0.010 mol·l -1 LiCl NH 3 ·H 2 O-NH 4 Cl buffer solution (pH value 9-11), mix the two and put them in a constant temperature oscillator for adsorption experiment. The adsorption temperature is 30℃ and the rotation speed is 150r·min. -1 , Respectively measure the lithium ion concentration in the solution at different times. The adsorption capacity of SMO-a is 2.19mmol·g -1 , Corresponding to the existing ultrafine powder ion sieve (marked as SMO-p1), the adsorption capacity of SMO-p1 is 1.99mmol·g -1 . From the experimental results, it is found that the performance of the spherical ion sieve SMO-a is better than that of the powder SMO-p1. The results show that the use of PVC bonding molding has little effect on the lithium adsorption performance of the ion sieve.
[0037] See the result figure 2 .
Example Embodiment
[0038] Example 3
[0039] Under the conditions of 5℃~50℃ and normal pressure (1atm), weigh 6.00g polyvinyl chloride (polymerization degree: 800±10) and dissolve it in 66ml NMP, add 20.00g Li after dissolving evenly 4 Mn 5 O 12 Super powder, after stirring evenly, use a dropper with a diameter of 3mm to drip into 400ml of a mixed solution of deionized water and ethanol, wash, and dry at 40-180℃ for 10-30 hours to obtain spherical Li4Mn 5 O 12 Type ion sieve precursor. The resulting spherical Li 4 Mn 5 O 12 Put in 1.0mol·l -1 Soak in hydrochloric acid (H / Li=4, molar ratio) for 24 hours, wash with deionized water, and dry at 40-180℃ for 10-30 hours to obtain spherical MnO 2 Ion sieve (Li 4 Mn 5 O 12 H type) is denoted as SMO-b. The specific surface area (BET) of SMO-b is: 36.32m 2 ·G -1 , See the SEM image image 3 .
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