Adsorption performance of titanium-based lithium ion sieves for Li+ through H+/Li+ exchange, is greatly limited by pH value of brine. To improve the adsorption capacity of HTO-P (formed titanium-based lithium ion sieves) for Li+, its adsorption characteristics and dynamic performance in Tibetan Brine-NaHCO3 (NaHCO3 as the buffer added into the brine used) were studied. With the addition of NaHCO3, it reduces the aggregation of H+, maintains pH value at ~7.5, and accelerates the mass transfer rate of Li+ in initial adsorption stage. Compared with Tibetan Brine, the equilibrium adsorption capacity and recovery ratio of HTO-P for Li+ in Tibetan Brine-NaHCO3 increase by 60% and 70%, respectively, and the adsorption equilibrium time is shortened by one-third. Moreover, the dynamic saturated adsorption capacity of HTO-P for Li+ reaches 14.25 mg/g in Tibetan Brine-NaHCO3. This work provides a basis on direct lithium adsorption and extraction process of salt lake brines.

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