Sol–Gel Derived Thin Li ₂ TiO ₃ Adsorbent Coating on Waste Brick Particles for Highly Efficient Lithium Extraction

ABSTRACT The selective extraction of lithium with a concentration of ppm level has attracted considerable attention, but most conventional lithium adsorbents face low adsorption capacity and poor regeneration performance because of the easy dissolution of lithium adsorbents as well as the usual blockage of adsorption sites by the addition of binders. Herein, an alternative Li 2 TiO 3 (denoted as LTO) adsorbent based on waste brick particles (WBP@HTO adsorbent) without binders was synthesized by the sol–gel method for selective lithium extraction. The WBP@HTO adsorbent without any binders can offer more available exposed adsorption sites compared with those of traditional lithium adsorbents. Consequently, the WBP@HTO adsorbent exhibited a high lithium adsorption amount of 46.6 mg/g and high selectivity compared to K + , Na + , Ca 2+ , Mg 2+ . The isothermal adsorption process of Li + by the WBP@HTO adsorbent is consistent with the Langmuir model and belongs to the monomolecular layer adsorption. Moreover, the WBP@HTO adsorbent possessed good regeneration performance and stable adsorption capacity. The facile preparation procedure of WBP@HTO adsorbent based on waste solid waste and their good adsorption performance brings a possible alternative for the selective lithium extraction.