期刊
JOURNAL OF MEMBRANE SCIENCE
卷 510, 期 -, 页码 141-154出版社
ELSEVIER
DOI: 10.1016/j.memsci.2016.02.062
关键词
Lithium recovery; Membrane adsorber; Mixed matrix; Nanofiber; Seawater
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning [2015R1A2A1A15055407]
- Ministry of Education [2009-0093816]
- National Research Foundation of Korea [2015R1A2A1A15055407] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A polysulfone (PSf)-based mixed matrix nanofiber (MMN) dispersed with particulate lithium ion sieves (LIS) was developed as a flow-through membrane Li+ adsorber. The MMN was prepared via electrospinning, thermal annealing, and acid pickling (i.e. activated LIS: Li0.67H0.96Mn1.58O4 or MO). The unique dimensional property of the macroporous MMN promoted high MO exposure and distribution on the nanofiber surface. Minimal losses in Li+ adsorption capacity and kinetics, elicited by the PSf matrix, were observed. Moreover, the PSf matrix effectively improved the Li+ selectivity of MO as it alleviated the sorption of interfering cations. As membranes, the MMNs were highly permeable to water under minimal trans-membrane pressure. The convective flow of seawater through the highly accessible MMN facilitated the fast Li+ transport to the MO surface. Breakthrough studies revealed that a balance between kinetics and dynamic Li+ adsorption capacity could be obtained at optimal seawater/MMN contact time, which was easily achieved by adjusting the feed flow-rate or MMN thickness. Continuous flow through operations were successfully controlled at a very short adsorption-desorption cycle time (one day) while maintaining the dynamic Li+ adsorption capacity of the MMN. Cycled operations confirmed the regenerability of the MMN and its adsorption performance consistency. Enrichment of Li+ was successfully done by repeated Li+ desorption in a small volume of acid solution. Overall results demonstrated the strong potential of the flow-through MMN membrane adsorber for continuous Li+ recovery from alternative resources like seawater. (C) 2016 Elsevier B.V. All rights reserved.
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