以熔分钛渣提纯得到的富钛料为钛源,通过固相法合成了吸附剂前躯体β-Li2TiO3.前躯体Li2TiO3经酸洗脱出Li+后制备得到H2TiO3型锂离子吸附剂.考察了前躯体Li2TiO3的合成温度,采用吸附动力学模型和Laagmuir 吸附等温方程研究了吸附剂的吸附性能.结果表明:当反应温度为750℃时,得到了具有良好结晶性的前驱体β-Li2TiO3.在Li+浓度为2 g/L的LiOH溶液中,该吸附剂的Li+吸附容量为28.51 mg/g.随吸附液的碱性增强,Li+浓度升高,吸附剂的吸附容量增大.通过Langmuir吸附等温方程计算,得出该吸附剂的理论最大吸附容量为45.6 mg/g.
β-Li2TiO3 was synthesized as precursor of the lithium-ion adsorbent via solid-phase reaction u sing Ti-rich material as titanium source,which was prepared by purification of melt-separated titanium slag.H2TiO3 lithium-ion adsorbent was finally obtained after extracting Li+ from the precursor Li2TiO3 via acid treatment.The synthesis temperature of precursor Li2TiO3 was investigated and the adsorption properties of the adsorbent were studied using adsorption kinetics model and Langmuir adsorption isotherm equation.Precursor β-Li2TiO3 with good crystallization was obtained at 750 ℃.In LiOH solution with 2 g/L of Li+ concentration,Li+ adsorption capacity of the adsorbent reached 28.51 mg/g.Li+ adsorption capacity increased with increase in alkalinity and Li+ concentration of the solution.The theoretical maximum adsorption capacity calculated by Langrnuir equation was 45.6 mg/g for the obtained adsorbent.
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