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Sieves for Highly Selective Li Adsorption

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Sieves for Highly Selective Li Adsorption ( sieves-highly-selective-li-adsorption )

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Temperature ◦ Table 4. Dynamic parameters of lithium adsorption. PseudoT-Faibrslet-O4.rDdyernaKminicetpicarMamodeteelrs of lithiumPsaedusdoorp-Stieocno.nd-Order Kinetic Model -1.0 -1.5 -2.0 0 5 10 15 20 Time (h) 25 30 0.5 0.0 -0.5 Processes 2018, 6, 59 Figure 10. Pseudo-first-order and pseudo-second-order kinetic curves Li+ adsorption by HMO at 18 °C. 11 of 14 22 K Pseudo-FiQrst-Order Kinetic MRodel Pseudo-KSecond-Order KiQnetic Model R 18 °C 0.115 8.41 3.3.4. Adsorption Isotherm of Li+ on HMO 0.7678 0.0687 25.3 1e1 2e2 25.3 0.9998 Temperature 􏲃􏲄 􏲀􏲅􏲄 0.115 8.41 􏲆􏲇 􏲃􏲇 􏲀􏲅􏲇 􏲆􏲇 0.9998 18 C 3.3.4. Adsorption Isotherm of Li+ on HMO 0.7678 0.0687 The adsorption constants and the correction factors were obtained by Langmuir and Freundlich The adsorption constants and the correction factors were obtained by Langmuir and Freundlich equations fittings. Table 5 lists the various parameter values for both models. Figure 11 show the fitting equations fittings. Table 5 lists the various parameter values for both models. Figure 11 show the effect of the two models. The Langmuir isotherm model (R2 = 0.9􏰛999) fitting was much better than fitting effect of the two models. The Langmuir isotherm model (􏱌 = 0.9999) fitting was much better that of the Freundlich isotherm model (R2 = 0.9􏰛918) compared with the experimental data. This result than that of the Freundlich isotherm model (􏱌 = 0.9918) compared with the experimental data. This indicates that the HMO has homogeneous adsorption sites. result indicates that the HMO has homogeneous adsorption sites. Exp.data Langmuir model Freundlich model 25 20 15 10 5 0 0 10 20 30 40 50 C0(mg.L-1) Figure 11. Langmuir and Freundlich isotherms of L+i+ adsorption by HMO at◦18 °C. Figure 11. Langmuir and Freundlich isotherms of Li adsorption by HMO at 18 C. + Table 5. Adsorption isotherm constants of Li+ on HMO. Table 5. Adsorption isotherm constants of Li on HMO. Temperature Langmuir Model Freundlich Model 􏲃 􏲀 􏲆􏲇 􏲃 􏲋 􏲆􏲇 􏲈􏲉􏲊 Table 6 shows the HMO ion sieve adsorption selectivity for Li+ compared with other coexisting metal ions in brine, including Na+, K+, Ca2+ and Mg2+. According to Table 6, the adsorption capacity of HMO in brine is 6.26 mg·g−1, which is lower than the value of that in the pure Li+ solution. We speculated that the acidic environment (pH = 5.64) is not conducive to the free insertion of lithium ions in λ-MnO2. The distribution coefficients (Kd) are in the order of Li+ > Ca2+ > K+ > Na+ > Mg2+, indicating high selectivity for Li+, compared with other metal ions. The ion sieve showed excellent ion selectivity,especiallyforMg2+,whoseseparationfactor(αLi )is1.35×103.Thissolvestheproblem Mg of separating Li+ and Mg2+ in brine with a high ratio of magnesium to lithium. Na+, K+, Ca2+, Mg2+ in solution do not have competitive effect with Li+ during ion sieve adsorption process since the concentration factor (CF) of Li+ is higher than other ions. Temperature Langmuir Model Freundlich Model 18 °C 0.415 24.6 0.9999 13.2 6.38 0.9918 KL Qm R2 KF n R2 0.415 24.6 0.9999 13.2 6.38 0.9918 18 ◦ C 3.4. Absorption Selectivity of HMO Q (mg.g-1) lg(

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