The material (besides clay) needs to be non-reactive/stable, and preferably synthetic. Thank you very much in advance! Your suggestion is very much appreciated!
Ion-exchange resins, apatite, and zeolites are good candidates for the same.
Dear Chin Yik Lin,
Commercially available materials that has a high surface area or CEC (cation exchange capacity):
Because of their unique cation-exchage, adsorption, hydration-dehydration, and catalytic properties, follwoing materials are being used in a wide variety of industrial purposes.
01. Zeolites: Zeolites are hydrated aluminosilicates of alkali and alkaline Earth cations (e.g., K+, Na+, Ca2+, Mg2+) that possess infinite 3-dimensional crystal structures (i.e., tektoslicates).
Naturalzeolites may have measured cation exchange capacities (CEC) of 200-300 meq/ 100 g, whereas synthetic zeolites may have a CEC as high as 500-600 meq /100 g.
02. Phyllosilicates: Vermiculites are higher charge materials (e.g., 140-160 meq/ 100 g) than smectites (e.g., 80-105 meq/ 100 g).
03. Tobermorites: The CECs of synthetic tobermorites depend on the degree of Al- and FE-substituted synthetic tobermorites had CECs as high as 182 meq/ 100 g.
I hope I have answered your question.
With Best Wishes,
Samir G. Pandya
Ceramic substances and Zeolites/ hydrated aluminum silicate can do this
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