溶胶-凝胶法制备的偏钛酸型锂离子吸附剂模拟从盐湖卤水中吸附Li+研究
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Simulative adsorption of Li+ from the saline lake brine by the H2TiO3-lithium adsorbent synthesized by the sol-gel process
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    摘要:

    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(Li2TiO3)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Mg2+和Ca2+,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8.25 mg·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+ (0.97 mL·g-1)的分配系数。Li+对Na+的分离因素()为47.2,Li+对K+的分离因素()为25.3,表明所制备的吸附剂对Li+具有很好的选择吸附性。

    Abstract:

    The Li2TiO3 nanoparticles were prepared by the sol-gel process by employing lithium acetate and tetrabutyl titanate as lithium and titanium sources, respectively, followed by modification with hydrochloric acid to obtain H2TiO3-lithium adsorbent (titanium lithium ionic sieve). Simulation of the saline lake brine was prepared, followed by adding sodium hydroxide to the prepared solution before adsorption to remove Mg2+ as well as Ca2+. Simulative adsorption of Li+ by the obtained adsorbent from the saline lake brine was carried out. The results indicate that the adsorption capacity of H2TiO3-lithium adsorbent for Li+ is 8.25 mg·g-1, and the partition coefficient (Kd) of Li+ is calculated to be 24.54 mL·g-1, which is much larger than that of Na+ (0.52 mL·g-1) and K+ (0.97 mL·g-1). Li+ to Na+ separation factor () is 47.2, and Li+ to K+ separation factor () is 25.3, indicating that the synthesized adsorbent has an excellent selective adsorption performance to Li+

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引用本文格式: 张理元,刘义武,周大利,姚歉歉,周加贝. 溶胶-凝胶法制备的偏钛酸型锂离子吸附剂模拟从盐湖卤水中吸附Li+研究[J]. 四川大学学报: 自然科学版, 2017, 54: 1045.

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  • 收稿日期:2017-01-01
  • 最后修改日期:2017-02-08
  • 录用日期:2017-02-13
  • 在线发布日期: 2017-09-27
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