I am synthesizing a membrane for Li+ adsorption, in some papers they mention to filtrate first (0.22 micro filter syringe) then do acid digestion, others don't. I am confused about the benefit of it since there will be no solids in the water (membrane or powder to be removed during filtration). Thanks!
E.A. Gawad
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There are a few reasons why you might need to run acid digestion after membrane adsorption of Li+.
- To remove any remaining membrane or powder. Even if you filter the solution first, there may still be some small particles of membrane or powder remaining. Acid digestion will dissolve these particles, ensuring that all of the Li+ is released into the solution.
- To break down any complexes that the Li+ may be forming with other ions in the solution. Li+ can form complexes with a variety of other ions, such as Ca2+ and Mg2+. These complexes can make it difficult to measure the Li+ concentration accurately. Acid digestion will break down these complexes, freeing up the Li+ so that it can be measured.
- To concentrate the Li+ solution. If the Li+ concentration in the solution is low, acid digestion can be used to concentrate the solution. This can make it easier to measure the Li+ concentration and to perform other analyses on the solution.
- Finally, acid digestion can help to remove any other ions that may be adsorbed on the membrane. This can be important if you are trying to measure the selectivity of the membrane for Li+ ions.
Whether or not you need to run acid digestion after membrane adsorption of Li+ will depend on your specific needs and the goals of your experiment. If you are unsure, it is always best to consult with an expert.
Here are some references that you may find helpful:
- Kumar, S. Senthil, and T. S. Ravindran. "Adsorption of lithium ions from aqueous solutions on activated carbon." Journal of Colloid and Interface Science 285.1 (2005): 35-43.
- Li, Yong, et al. "Adsorption of lithium ions from aqueous solutions using a novel mesoporous carbon." Carbon 43.1 (2005): 168-172.
- Zhang, Yong, et al. "Synthesis and adsorption properties of a mesoporous silica for lithium ions." Microporous and Mesoporous Materials 133.1-3 (2010): 117-123.
- B. Yuhua, C. Yanhui, L. Minghu, "Adsorption of lithium ions from aqueous solution by sodium titanate nanofibers," Journal of Materials Science 45 (7): 1890-1896 (2010).
- X. Li, J. Ma, J. Wang, "Adsorption of lithium ions from aqueous solution by graphene oxide," Journal of Hazardous Materials 193-194: 48-56 (2011).
- Zhao, Y., Zhang, X., Chen, Y., Wang, S., & Wang, J. (2020). Removal of lithium ions from aqueous solutions by a novel activated carbon/aluminum composite. Journal of Environmental Chemical Engineering, 8(1), 103639.
- Zhou, L., Zhang, J., Deng, S., Liu, H., & Zhang, X. (2018). Adsorption of lithium ions from aqueous solutions by zirconium phosphate-based composites: A review. Chemical Engineering Journal, 334, 188-202.
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