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Synthesis of carbon xerogels and their application in adsorption studies of caffeine and diclofenac as emerging contaminants

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dc.contributor.authorÁlvarez, Silvia
dc.contributor.authorRibeiro, Rui
dc.contributor.authorGomes, Helder
dc.contributor.authorSotelo, José
dc.contributor.authorGarcía, Juan
dc.date.accessioned2015-06-19T09:03:11Z
dc.date.available2015-06-19T09:03:11Z
dc.date.issued2015
dc.description.abstractThis work involves the application of carbon xerogels in the removal of two emerging contaminants, caffeine and diclofenac, from aqueous solutions. Textural characterization of the carbon xerogels prepared by polycondensation of resorcinol with formaldehyde (witha molar ratio of 1:2) has been investigated using N2 adsorption–desorption at −196◦C. Chemical surface groups were analyzed by FTIR spectroscopy, elemental microanalysis and determination of isoelectric point. The equilibrium tests were carried out using different weights of adsorbent and the experimental data were best correlated by Sips isotherm equation. The kinetic experimental data were described using pseudo-first and pseudo-second order kinetic models, being well described by a pseudo-second order model. The maximum adsorption capacity was observed for adsorption of caffeine onto a xerogel treated with urea solution (182.5 mg g−1), due to the presence of Lewis bases on its surface, which increase the adsorption affinity for organic compounds. On the other hand, the higher extent of diclofenac adsorption was obtained with a carbon xerogel treated with sulfuric acid (80.0 mg g−1), mainly due to electronic interactions. Comparing these results with other data reported in the literature, the carbon xerogels employed in our study were found to exhibit comparable adsorption capacities and higher kinetic properties.por
dc.identifier.citationÁlvarez S.; Ribeiro R.S.; Gomes H.T.; Sotelo J.L.; García J. (2015). Synthesis of carbon xerogels and their application in adsorption studies of caffeine and diclofenac as emerging contaminants. Chemical Engineering Research and Design. 95, p. 229-238por
dc.identifier.doi10.1016/j.cherd.2014.11.001
dc.identifier.urihttp://hdl.handle.net/10198/11876
dc.language.isoengpor
dc.peerreviewedyespor
dc.subjectAdsorptionpor
dc.subjectCaffeinepor
dc.subjectCarbon xerogelpor
dc.subjectDiclofenacpor
dc.subjectEmerging contaminantpor
dc.titleSynthesis of carbon xerogels and their application in adsorption studies of caffeine and diclofenac as emerging contaminantspor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage238por
oaire.citation.startPage229por
oaire.citation.titleChemical Engineering Research and Designpor
oaire.citation.volume95por
person.familyNameGomes
person.givenNameHelder
person.identifier.ciencia-id6218-1E19-13EE
person.identifier.orcid0000-0001-6898-2408
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication0eb96337-224a-4339-9918-334436fbbb99
relation.isAuthorOfPublication.latestForDiscovery0eb96337-224a-4339-9918-334436fbbb99

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