Effect of N-heptane Pore-Forming on Adsorption Performance of Spherical Manganese-Titanium Composite Lithium Ion Sieve
The spherical lithium ion screen precursor was prepared by low temperature suspension polymerization granulation using styrene as matrix,Li1.6Mn1.6O4(Ti 10％)as raw material and n-heptane as pore-making agent.The spherical lithium ion screen was obtained after analysis by 0.5 mol/L HC1.The morphology and adsorption properties of the samples were characterized by scanning electron microscope,X-ray diffractometer and atomic absorption spectrophotometer.The experimental results show that the lithium ion screen is spherical after adding 5％n-heptane of styrene volume.The porosity of the lithium ion screen increases significantly,and the specific surface area reaches 1.768 m2/g.When the addition of n-heptane was 5％,the adsorption capacity of lithium ion sieve reached the maximum at 9 mg/g,which increased by 28.8％compared with the control group without n-heptane.The adsorption process conforms to the second-order adsorption kinetic model and belongs to chemisorption.The spherical lithium ion screen shows good cyclic performance.After adding 5％n-heptane lithium ion screen for 10 times of cyclic adsorption,the average single dissolution loss rate of Mn is 0.13％,and the average single dissolution loss rate of Ti is 0.028％.
Manganese titanium complex lithium ion sieveN-heptanePolystyreneSuspension polymerization granulationAdsorption performance
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