Synthesis of H₄Mn₅O₁₂ Nanotubes Lithium Ion Sieve and Its Adsorption Properties for Li⁺ from Aqueous Solution

Abstract

Li4Mn5O12 with nanotubes morphology was successfully prepared by hydrothermal and solid phase reaction. The as‐obtained adsorbent was determined by X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and N2 ad/desorption technologies. The characterization results indicated that spinel H4Mn5O12 took on two‐dimensional nanotubes morphology with the diameter of pore ∼200 nm, BET surface area is 92.997 m2⋅g−1, and the corresponding pore size centers at 3.4, 35.9 and 156.5 nm. The adsorption experimental results showed that the maximum Li+ adsorption capacity of H4Mn5O12 was as high as 37.0 mg⋅g−1, and the adsorption process fit well with Langmuir model. In addition, adsorption kinetic experimental data were well fitted by the pseudo‐second‐order model, which indicated the adsorption process followed chemisorption involving in ion exchange. The effects of co‐existing cations on lithium recovery suggested that Na+, K+, Ca2+ and Mg2+ ions had very small effect on recovery of lithium. The regeneration of H4Mn5O12 for the multicyclic Li+ adsorption and desorption were also assessed. The result implied that most of Li+ could be desorbed within 40 min, but the adsorption capacity decreased when the number of cycles was five, which indicated that the structure of H4Mn5O12 was needed to be improved. Lithium adsorption onto H4Mn5O12 could be attributed to electrostatic interaction and ion exchange between Li+ and H+ according to the results of adsorption isotherm and kinetics properties.

Phosphorylated hazelnut shell waste for sustainable lithium recovery application as biosorbent

“…Biosorption is highly effective in separation of organic and inorganic substances in soluble or insoluble forms from an aqueous solution through the utilization of low-cost biosorbent materials among other methods (Fomina and Gadd 2014). Most of the studies on lithium recovery from a mixture of diverse cations with high concentrations have been conducted by inorganic adsorbents such as H 4 Mn 5 O 12 nanotubes lithium ion sieve (Xu et al 2019), iron-doped lithium titanium oxides (Wang et al 2018), titanium type ion sieve (H x TiO 3 ) (Wang et al 2017), k-MnO 2 (Yoshizuka et al 2002;Kitajou et al 2006;Park et al 2012;Recepog ˘lu et al 2017Recepog ˘lu et al , 2018. To our best knowledge, no studies have been found in the literature regarding the synthesis of lithium sorption-capable biosorbents from lignocellulosic wastes.…”