Abstract
AbstractA large number of activated carbons, carbon blacks, ion exchange resins, and inorganic adsorbents were screened for their capacity to remove urea from dilute neutral solution. An adsorbent capable of performing this task would be of assistance in decreasing the volume of dialyzing fluid required for hemodialysis. All activated carbons and carbon blacks had some adsorption capacity for urea. The most efficient was a carbonized poly(vinylidene chloride). The inorganic adsorbents exhibited negligible urea adsorption capacity, as did ion exchange resins in the ionic form at equilibrium with simulated dialyzing fluid. Several chemical reactions for urea were found not to procede in dilute neutral solution, even with carbon present to adsorb reaction products. Attenuated total reflectance infrared spectroscopy showed no band shifts in urea adsorbed on strong acid ion exchange resin. Measurement of the spectrum of urea adsorbed on carbon was prevented by adsorption of the incident energy by the carbon.
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