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本文以钛酸丁酯和乙酸锂为钛源和锂源,采用溶胶-凝胶法制备了钛酸锂(Li_2TiO_3)纳米粒子,用盐酸对其进行处理得到偏钛酸型锂离子吸附剂(钛锂离子筛).配制了盐湖卤水模拟液,在吸附之前向模拟液中加入氢氧化钠除去Mg~(2+)和Ca~(2+),并用所制备的吸附剂进行了模拟从盐湖卤水中吸附锂离子的研究.结果表明偏钛酸型锂离子吸附剂对锂离子的吸附容量为8.25mg·g~(-1),Li~+的分配系数(Kd)为24.54 mL·g~(-1),其数值远大于Na~+(0.52 mL·g~(-1))和K+(0.97mL·g~(-1))的分配系数.Li~+对Na~+的分离因素(αLiNa)为47.2,Li~+对K~+的分离因素(αLiK)为25.3,表明所制备的吸附剂对Li~+具有很好的选择吸附性.
In this paper, lithium titanate (Li_2TiO_3) nanoparticles were prepared by sol-gel method using butyl titanate and lithium acetate as titanium source and lithium source, and treated with hydrochloric acid to obtain the titanate-type lithium ion adsorbent Lithium ion sieve was prepared. Salt lake brine simulation liquid was prepared. Before the adsorption, sodium hydroxide was added to the simulation liquid to remove Mg 2+ and Ca 2+. Simulated with the prepared adsorbent, The results showed that the adsorption capacity of lithium titanate-type lithium ion adsorbent for lithium ion was 8.25 mg · g -1, and the partition coefficient (Kd) of Li ~ + was 24.54 mL · g ~ (-1) -1), which is much larger than the partition coefficient of Na ~ + (0.52 mL · g -1) and K + (0.97 mL · g -1) .The separation factor of Na ~ + αLiNa) was 47.2. The separation factor (αLiK) of Li ~ + to K ~ + was 25.3, which indicated that the prepared adsorbent had good selective adsorption to Li ~ +.