Mechanism of lithium adsorption by AILi-LDH with Al-O octahedral ring
Aluminum-lithium layered double hydroxide(AILi-LDH)was synthesized using a co-precipitation method for Li+adsorption.AILi-LDH crystallized in space group of P32 or C2/m,where the microstructure had regular spherical shapes with diameters of 5-10 pm.The space group of AlLi-LDH only belonged to P32 after Li+adsorption.The Li+adsorption from a solution with a Li+concentration of 95.4 mg/L reached 8.98 mg/g after 1 h.The adsorption amount increased to 16.50 mg/g after 48 h,where the Li+adsorption capacity determined by applying the second-order adsorption model was 17.57 mg/g.The Mg2+/Li+separation coefficient was 29536 when the mass ratio of Mg2+to Li+was 1067.The interaction strength of Li-O was weaker for AlLi-LDH in the P32,where the interaction occurs via the electrostatic effect.The Li+adsorption and desorption occurred more readily in AlLi-LDH belonging to P32 space group.
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