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The synthesis of disc-shaped potassium ion sieve membrane and its separation performance in the electric drive process

Authors： QI Shanshan2,3, YUAN Junsheng1,3*, ZHANG Chengkai1,3

Units： 1.School of Marine Science and Engineering, Hebei University of Technology, Tianjin 300130; 2. School of Chemical Engineering, Hebei University of Technology, Tianjin 300130; 3. Engineering Research Center of Seawater Utilization of Ministry of Education; Tianjin 300130

KeyWords： Disc-shaped potassium ion sieve membrane; Separation performance in the electric drive process; Extraction of potassium from concentrated seawater

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2017,37(1):27-35

Abstract：

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.

Funds：

国家科技支撑计划项目（2015BAB09B00）；长江学者和创新团队发展计划（IRT14R14）

AuthorIntro：

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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