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Title (Primary) Removal of gadolinium-based contrast agents: adsorption on activated carbon
Author Elizalde-González, M.P.; García-Díaz, E.; González-Perea, M.; Mattusch, J.
Journal Environmental Science and Pollution Research
Year 2017
Department ANA
Volume 24
Issue 9
Page From 8164
Page To 8175
Language englisch
Keywords Gadolinium-based contrast agents; Adsorption; Activated carbon; Model urine; Emerging water pollutants
UFZ wide themes RU4;
Abstract Three carbon samples were employed in this work, including commercial (1690 m2 g−1), activated carbon prepared from guava seeds (637 m2 g−1), and activated carbon prepared from avocado kernel (1068 m2 g−1), to study the adsorption of the following gadolinium-based contrast agents (GBCAs): gadoterate meglumine Dotarem®, gadopentetate dimeglumine Magnevist®, and gadoxetate disodium Primovist®. The activation conditions with H3PO4 were optimized using a Taguchi methodology to obtain mesoporous materials. The best removal efficiency by square meter in a batch system in aqueous solution and model urine was achieved by avocado kernel carbon, in which mesoporosity prevails over microporosity. The kinetic adsorption curves were described by a pseudo-second-order equation, and the adsorption isotherms in the concentration range 0.5–6 mM fit the Freundlich equation. The chemical characterization of the surfaces shows that materials with a greater amount of phenolic functional groups adsorb the GBCA better. Adsorption strongly depends on the pH due to the combination of the following factors: contrast agent protonated forms and carbon surface charge. The tested carbon samples were able to adsorb 70–90% of GBCA in aqueous solution and less in model urine. This research proposes a method for the elimination of GBCA from patient urine before its discharge into wastewater.
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Elizalde-González, M.P., García-Díaz, E., González-Perea, M., Mattusch, J. (2017):
Removal of gadolinium-based contrast agents: adsorption on activated carbon
Environ. Sci. Pollut. Res. 24 (9), 8164 - 8175