A novel study on preparation of H₂TiO₃–lithium adsorbent with titanyl sulfate as titanium source by inorganic precipitation–peptization method

Abstract

A peroxy lithium titanate sol was prepared with low-cost and easily available titanyl sulfate as the titanium source, lithium acetate as the lithium source, and aquae hydrogenii dioxidi as the complexing agent using an inorganic precipitation-peptization method. The sol system was aged, centrifugal-washed, dried and calcined to obtain a pure precursor, Li 2 TiO 3 , followed by pickling with hydrochloric acid to obtain the H 2 TiO 3 -lithium adsorbent. The effects of aging time and calcination temperature on the target product were investigated. The results indicate that the sol-system is stable, which is beneficial for loading on a suitable carrier, such as ceramic foams. Centrifugal-washing, instead of vacuum filtration-washing, is conducive to product formation. The most suitable aging time of precursor sol is 24 h and the appropriate calcination temperature is 750 C. The lithium drawn-out ratio of samples synthesized in this condition reaches 89.50% after pickling with 0.2 M hydrochloric acid for 8 h at 70 C. Moreover, the Li + uptake of the adsorbent (adsorption capacity) reaches 29.96 mg g À1 and 33.35 mg g À1 when the adsorption time is 1 h and 8 h, respectively.

Bifunctional Modification Enhances Lithium Extraction from Brine Using a Titanium-Based Ion Sieve Membrane Electrode

“…A comparison of the XRD patterns of LTO and HTO revealed that the (110) crystal plane were offset, and the (−131) and (−204) crystal planes became wider in HTO due to a change in the bonding modes of Li + and H + ions in the Ti–O layer . The disappearance of peaks corresponding to the (−133) and (−206) crystal planes indicates that Li + ions were successfully extracted from LTO . After doping and coating modifications, the diffraction peak intensity of ion sieve decreased (Figure S1).…”

On the Structure and Lithium Adsorption Mechanism of Layered H2TiO3

“…From the XRD and USAXS/SAXS studies, it is evident that delithiation of β-Li 2 TiO 3 results in significant changes in the crystal structure and morphology. Various authors attributed the missing diffraction peaks after delithiation to the replacement of O–Li ionic bonds in Li 2 TiO 3 with electrostatic interactions of H + ions between HTi 2 layers ,− (i.e. ; O–H covalent bonds are absent in H 2 TiO 3 ).…”

Amorphous TiO2‐Derived Large‐Capacity Lithium Ion Sieve for Lithium Recovery

“…However, the adsorption equilibrium was not reached until 24 h. Chitrakar et al prepared the LISs precursor Li 2 TiO 3 from anatase TiO 2 and Li 2 CO 3 , and then eluted with hydrochloric acid to obtain H 2 TiO 3 with a saturated adsorption capacity of 32.6 mg g -1 [22]. Meanwhile, many reported works aimed at improving the adsorption capacity via synthesis method and morphology regulation but ignored the slow adsorption rate [23][24][25].…”