Hexbyte Glen Cove
Larger, doubly charged cations, such as calcium, move through the membranes faster than smaller, singly charged cations such as lithium. The work is published in the Chemical Engineering Journal.
The smaller lithium cations permeate more slowly through the UV-rGO membranes than larger cations, such as calcium and magnesium, resulting in a 3- to 4-fold improvement in the separation selectivity between these representative cations.
UV exposure selectively removed hydroxyl (–OH) groups from the GO basal planes, leading to enhanced interactions of metal cations with functional groups located at the edges of GO. This resulted in a lower ratio of free mobile lithium in solution compared to calcium cations. A separation mechanism analogous to chromatography is proposed for UV-rGO, emphasizing the crucial role of different oxygen groups on GO in controlling selective ion transport through GO membranes.
More information:
Yiming Yin et al, Distinct ion transport behavior between graphene oxide and UV-irradiated reduced graphene oxide membranes, Chemical Engineering Journal (2024). DOI: 10.1016/j.cej.2024.152304
Citation:
Surface oxygen functionality controls selective transport of metal ions through graphene oxide membranes (2024, July 25)
retrieved 26 July 2024
from https://phys.org/news/2024-07-surface-oxygen-functionality-metal-ions.html
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