Bio-inspired membrane to transform lithium extraction from salt lakes

Scientists have rapidly advanced new methods in the world of lithium.

In a new development, a new study undertaken by scientists from the Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT) of the Chinese Academy of Sciences, along with collaborators, have developed an environmentally friendly and sustainable method of lithium extraction.

Overcoming the limitations of separating lithium ions from magnesium ions

Researchers sought to address the limitations of separating lithium ions from magnesium ions in salt lake brine. To do this, they designed a crystalline carbon nitride membrane that mimics biological ion channels.

This development aims to meet the growing demand for lithium driven by the rise of electric vehicle manufacturing and the renewable energy sector, while also aiming to minimize the environmental impact associated with traditional lithium extraction practices.

The ultimate goal is to improve the efficiency and sustainability of lithium recovery processes, thereby contributing to wider adoption of renewable energy technologies and electric mobility.

Introduction of “congener-welded” crystalline carbon nitride membrane

The study introduced a “congener-welded” crystalline carbon nitride membrane with bio-inspired enhancements that significantly outperform traditional polymer membranes, according to a statement from the scientists.

The release adds that the new membrane can efficiently extract lithium ions from a mixture with a much higher magnesium content, achieving a selectivity ratio of 1,708, also necessary to handle the high magnesium levels common in lithium sources. .

“Our approach was to mimic these natural systems, creating a membrane with both high selectivity and improved stability, essential for practical applications,” said ZHANG Yuanyuan, co-first author of the study.

The membrane comprises a combination of crystalline and amorphous forms of polymeric carbon nitrite which allows for its uniformity and narrow pores. They exclude larger hydrated magnesium ions while allowing smooth movement of lithium ions.

The design is inspired by natural, highly selective and stable ion channels, essential for practical applications. This structure and functionality leads to improved selectivity and stability compared to traditional polymer membranes, according to the statement.

“The dual functionality of our membrane opens up new possibilities for use beyond lithium extraction,” said Professor GAO Jun, co-corresponding author of this study.

“These properties could make a significant contribution to environmental protection efforts, in addition to improving the efficiency of resource recovery. »

Professor LIU Jian, co-corresponding author, added: “Advancements made with this membrane technology offer new possibilities for efficient extraction of lithium, a crucial element in the transition to renewable energy and electric mobility. »

The method could pave the way for a more viable, sustainable and environmentally friendly solution for lithium extraction. The durability of the membrane comes from its high efficiency, durability and bio-inspired design, which enables efficient lithium extraction with minimal environmental impact.

The study was published earlier today (June 14, 2024) in the journal – Scientists progress.