Lanzhou Institute of Materials and Materials made progress in the separation of graphene nanopores
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As a two-dimensional carbon nanomaterial, graphene is widely used in energy electronics, biomedicine, and chemical materials. At present, a number of scientists have predicted from theoretical calculations that graphene will be able to be used as a single-atom layer filter membrane for seawater desalination, sewage treatment, and energy batteries.
Recently, the research team of the "Hundred Talents Program" led by Qiu Hongdeng, a researcher at the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, cooperated with the Institute of Modern Physics of the Chinese Academy of Sciences and Lanzhou University to use a heavy ion accelerator to irradiate PET-based single-layer graphene films in combination with chemical etching. Techniques have successfully prepared porous graphene separation membranes that can be used for the separation of inorganic metal ions in aqueous solutions. The effects of electric fields, acidity, and temperature on the selective separation of inorganic metal ions were investigated, and the separation process was performed in combination with density functional theory. Simulation calculations. Studies have shown that the high selectivity of graphene nanopores for metal ions stems from the ion exchange effect of carboxyl groups around the nanopores. The work provides new ideas for the preparation of porous graphene separation membranes and the application of graphene nanopores. The results of the study were published in the American Journal of Analytical Chemistry (2016, DOI: 10.1021/acs.analchem.6b02175).
In addition, the researchers also found that the order of filtration of graphene nanopores for monovalent alkali metal ions is strikingly similar to the order in which these metal ions pass through the cell membrane (Rb+>K+>Cs+>Na+>Li+), indicating that graphene nanopores have Similar to the function of cell membrane potassium channels. At the same time, it is also found that graphene can spontaneously curl into single-layered capsules or single-walled nanotubes of a cell-like scale and structure in environments of high salinity and acidity, and graphene that adsorbs phospholipids can form double-layered capsules resembling cells. This structure is highly similar to existing cell structures. Further studies confirmed that graphene can preferentially adsorb levorotary amino acids. More importantly, calculations show that graphene-crimped nanotubes have a nucleic acid-like alpha helix structure. According to these studies, it is speculated that the graphene formed by lightning flashes falls into the ocean with high acidity and high salinity, and spontaneously curls into a cell-like membrane structure. The subsequent levorotatory amino acids formed in the selective adsorption Miller experiment promotes the presence of the original protein. Graphene surface synthesis. At the same time, with the appearance of phosphorus-containing compounds, graphene further promotes the formation of nucleic acids and then evolves into primitive cells. Related work was published in Scientific Reports (2015, 5, 10258).
The above work has been funded by the National Natural Science Foundation of China, the Outstanding Youth Fund of Gansu Province, and the “One-Three-Five†Key Cultivation Project of the Lanzhou Institute of Chemicals.
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