泡沫陶瓷基偏钛酸型锂离子吸附剂的动态吸附和洗脱性能研究

Dynamic adsorption and elution performances of H2TiO3-lithium adsorbent loaded on ceramic foams

摘要:

通过溶胶-凝胶法把偏钛酸型锂离子吸附剂负载在堇青石基泡沫陶瓷上，采用离子交换柱研究了所制备的样品的动态吸附和洗脱性能。研究了液体流速、Li+浓度、单柱/多柱对吸附容量和Li+富集倍数的影响。结果表明，泡沫陶瓷基锂离子吸附剂达到穿漏点所需的时间较长，吸附剂具有较大的操作吸附容量。在一定的范围内，洗脱液的流速不会显著影响Li+的富集倍数。吸附剂对高浓度的Li+不具有富集的能力，而对低浓度的Li+具有富集的能力。通过在洗脱流出液中加盐酸将其pH值调节到原始的洗脱液pH值，再将其作为洗脱液，吸附剂对Li+的富集倍数最少可以达到26.55倍。

Abstract:

H2TiO3-lithium adsorbent was loaded on cordierite-based ceramic foams by the sol-gel process. The adsorption and elution of Li+ by the obtained samples were studied with the ion exchange columns via the dynamic process. The effects of liquid flow speed, Li+ concentration and single column/multi columns on the adsorption capacity and enrichment factor of Li+ were studied. The results indicate that it needs a long time for the lithium adsorbent loaded on ceramic foams to reach the leakage, and the adsorbent has a high operational adsorption capacity. In a certain range, flow rate of the eluent does not affect enrichment factor of Li+ apparently. The adsorbent does not have the ability to enrich Li+ with a high concentration. However, it is capable for the adsorbent to enrich a low level of Li+. The enrichment factor of Li+ can at least reach 26.55 times by adding hydrochloric acid to adjust pH of the effluent liquid to equal to that of the original eluent and using the obtained liquid as the eluent repeatedly.