膜科学与技术

板式钾离子筛膜的合成及其电驱分离性能

作者：齐珊珊，袁俊生，张成凯

单位： 1.河北工业大学海洋科学与工程学院，天津 300130；2.河北工业大学化工学院，天津 300130；3.海水资源高效利用化工技术部教育部工程研究中心，天津 300130

关键词：板式钾离子筛膜；电驱分离；浓海水提钾

出版年,卷(期):页码： 2017,37(1):27-35

摘要：

采用二次水热合成法，在板式α-Al2O3基膜上，以n(Si):n(Al):n(模板剂):n(KOH):n(H2O)= 36.8:8:1:24.8:771为原料配比，在200℃下合成钾离子筛膜，并考察了晶化时间、模板剂、合成次数对钾离子筛膜的影响。利用XRD、SEM、EDS和单一气体渗透测试进行表征，表明成功合成厚度约为30μm的钾离子筛膜，其H2渗透率为20.6×10-6mol·m-2·s-1·Pa-1，N2渗透率为8.1×10-6mol·m-2·s-1·Pa-1，α(H2/N2)=2.54，表明该膜致密均匀。电驱动实验结果表明，K+、Na+、Mg2+和Ca2+的渗透通量分别为852.61(平均值) mmol/(m2·h)、112.38 mmol/(m2·h)、12.44 mmol/(m2·h)、5.26 mmol/(m2·h)，钾离子筛膜对钾离子的选择性系数分别为αK/Na=7.25、αK/Mg=69.85、αK/Ca=166.06；离子通量随着浓度、电压和温度的增大均增大；离子选择性随着电压的增大而增大，而离子选择性随着浓度和温度的增大而降低。结果表明，在直流电场的作用下，板式钾离子筛膜对钾离子具有良好的选择分离性能。

α-Al2O3 supported potassium ionic sieve membrane was synthesized by the secondary hydrothermal growth method with the synthetic liquid ratio of n(Si):n(Al):n(template)：n(KOH): n(H2O)= 36.8:8:1:24.8:771 under 200℃. Further studies on the synthetic time, template agent and number of synthesis of the influence on the potassium ion sieve membrane crystal growth were carried. Then it was characterized by XRD, SEM, EDS and gas permeation. It turns out that the potassium ion sieve membrane about 30μm thickness was synthesized successfully. The permeability of H2 is 20.6×10-6mol·m-2·s-1·Pa-1 while N2 8.1×10-6mol·m-2·s-1·Pa-1. And the separation factor of H2/N2 is 2.54.The permeation flux of K+ , Na+ , Ca2+ and Mg2+ are 852.61mmol/(m2·h), 112.38mmol/(m2·h), 12.44mmol/(m2·h), 5.26mmol/(m2·h) respectively in the electric drive experiments. The separation factors of K+/Na+, K+/Mg2+ and K+/Ca2+ are equal 7.25, 69.85, 166.06. Ion flux are increased with the increase of concentration, voltage and temperature. Ion selective are decreased with the increase of concentration and temperature but increased with voltage. The results show that the disc-shaped ion sieve membrane for the separation of potassium ion has a good performance under the effect of DC field.

作者简介：齐珊珊（1991-），女，河南省滑县，硕士，河北工业大学，研究方向：海洋化学资源利用与环境保护，E-mail:13652108680@163.com 通讯作者：袁俊生（1961-），男，博士，教授，研究方向：海水资源综合利用，E-mail：jsyuan2012@126.com

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