Adsorption of Chondroitin Sulphate a onto Zirconia Nanoparticles
The adsorption equilibria between chondroitin sulphate A (CSA), a polyanionic biopolymer, and zirconium(IV) dioxide (zirconia) nanoparticles were investigated to characterize the extraction of CSA using the metal oxide. Adsorption isotherms were prepared using sample solutions adjusted to pH values...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SAGE Publications
2011-12-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.29.10.1025 |
| Summary: | The adsorption equilibria between chondroitin sulphate A (CSA), a polyanionic biopolymer, and zirconium(IV) dioxide (zirconia) nanoparticles were investigated to characterize the extraction of CSA using the metal oxide. Adsorption isotherms were prepared using sample solutions adjusted to pH values in the range 1.5–7.8, employing various buffer systems, NaCl concentrations and temperatures. The maximum amounts of CSA adsorbed, n a m , and the adsorption constants, K L , were calculated from non-linear curve fits to the Langmuir adsorption model. The buffer components suppressed CSA adsorption to varying degrees; however, the reversibility of the adsorption equilibria improved in the presence of the buffers, as indicated by the large values of K L and the small standard deviations. The temperature-dependent adsorption properties showed that a large n a m value was obtained at 318 K. The extraction of glycosaminoglycans with zirconia was optimal in the presence of acetate ions and at high temperatures, and subsequent desorption was achieved using a NaH 2 PO 4 eluent solution. |
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| ISSN: | 0263-6174 2048-4038 |