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Adsorption Behavior and Mechanism of Oxytetracycline on Rice Husk Ash: Kinetics, Equilibrium, and Thermodynamics of the Process

2020-03-02Journal article Restricted access
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datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
datacite.subject.fosEngenharia e Tecnologia::Engenharia do Ambiente
datacite.subject.fosCiências Naturais::Ciências Químicas
datacite.subject.sdg06:Água Potável e Saneamento
datacite.subject.sdg11:Cidades e Comunidades Sustentáveis
datacite.subject.sdg13:Ação Climática
dc.contributor.authorAndrade, Christhel A.
dc.contributor.authorZambrano-Intriago, Luis Angel
dc.contributor.authorOliveira, Nelson S.
dc.contributor.authorVieira, Judite S.
dc.contributor.authorQuiroz-Fernández, Luis Santiago
dc.contributor.authorRodríguez-Díaz, Joan Manuel
dc.date.accessioned2025-09-22T18:13:51Z
dc.date.available2025-09-22T18:13:51Z
dc.date.issued2020-03-02
dc.description.abstractThe main objective of the present study is to determine the kinetics, thermodynamics, and adsorption mechanism of the oxytetracycline (OTC) on rice husk ash (RHA). The adsorbent was characterized by scanning electronic microscopy, Fourier transform infrared spectroscopy, and nitrogen physisorption. Batch studies were carried out to evaluate the influence of the adsorbent dose, initial concentration, contact time, temperature, and initial pH. RHA was characterized as having heterogeneous, fibrous, and porous particles, consisting predominantly of silica. The removal of OTC depends on the pH of the medium, which is favored at acid pH values. The kinetic data followed the Bangham model, which indicated an OTC diffusion in the pores of RHA, although this was not the only process, as demonstrated through the use of the Weber-Morris model (IPD model). The Sips isotherm best represents the experimental results of the equilibrium study. It was found that the adsorption process was spontaneous and endothermic. The highest adsorption capacity was found at a pH in the range of 4–6, when the OTC is in its zwitterion form and the surface of the RHA is positively charged, thus permitting electrostatic interactions and the formation of hydrogen bonds between the adsorbent and adsorbate molecules. These findings demonstrate the potential of rice husk ash to remove oxytetracycline from water.eng
dc.description.sponsorshipAcknowledgments: The authors would like to thank the Laboratório de Engenharia e Processos Ambientais (LEPA), Laboratório de Engenharia Ambiental (LEA), Centro de Tecnologías Estratégicas do Nordeste (CETENE), and Laboratory of the Centro de Materiais da Universidade do Porto (CEMUP) for their help in the adsorbent characterization and the Scanning ElectronMicroscopy andX-raymicroanalyses and to the company Espectrocrom, especially to the Engineer Edmundo Regalado by his unconditional support. Funding Information: The authors would like to acknowledge the Secretaría de Nacional de Educación Superior, Ciencia y Tecnología del Ecuador (SENESCYT), and Universidad Técnica de Manabí for the financial support granted for this work.
dc.identifier.citationAndrade, C.A., Zambrano-Intriago, L.A., Oliveira, N.S. et al. Adsorption Behavior and Mechanism of Oxytetracycline on Rice Husk Ash: Kinetics, Equilibrium, and Thermodynamics of the Process. Water Air Soil Pollut 231, 103 (2020). https://doi.org/10.1007/s11270-020-04473-6.
dc.identifier.doi10.1007/s11270-020-04473-6
dc.identifier.eissn1573-2932
dc.identifier.issn0049-6979
dc.identifier.urihttp://hdl.handle.net/10400.8/14103
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSpringer Nature
dc.relation.hasversionhttps://link.springer.com/article/10.1007/s11270-020-04473-6
dc.relation.ispartofWater, Air, & Soil Pollution
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectOxytetracycline
dc.subjectRice husk ash
dc.subjectElectrostatic interactions
dc.subjectHydrogen bonds
dc.titleAdsorption Behavior and Mechanism of Oxytetracycline on Rice Husk Ash: Kinetics, Equilibrium, and Thermodynamics of the Processeng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage16
oaire.citation.startPage1
oaire.citation.titleWater, Air, & Soil Pollution
oaire.citation.volume231
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameAndrade
person.familyNameOliveira
person.familyNamevieira
person.givenNameChristhel
person.givenNameNelson
person.givenNamejudite
person.identifier.ciencia-idCB18-B848-4389
person.identifier.ciencia-idEA1B-12E3-7703
person.identifier.orcid0000-0002-2448-6186
person.identifier.orcid0000-0001-9451-2485
person.identifier.orcid0000-0001-7982-5686
person.identifier.ridH-5018-2017
person.identifier.scopus-author-id7005130374
person.identifier.scopus-author-id36869854300
relation.isAuthorOfPublication2ca0586f-9eda-491c-b1ac-4f11d53f1f81
relation.isAuthorOfPublication2b2a0872-ca17-4f98-a85d-8dbdb6a04a8a
relation.isAuthorOfPublication72df3193-dd37-46a1-bca3-fca816008bf1
relation.isAuthorOfPublication.latestForDiscovery2b2a0872-ca17-4f98-a85d-8dbdb6a04a8a

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The main objective of the present study is to determine the kinetics, thermodynamics, and adsorption mechanism of the oxytetracycline (OTC) on rice husk ash (RHA). The adsorbent was characterized by scanning electronic microscopy, Fourier transform infrared spectroscopy, and nitrogen physisorption. Batch studies were carried out to evaluate the influence of the adsorbent dose, initial concentration, contact time, temperature, and initial pH. RHA was characterized as having heterogeneous, fibrous, and porous particles, consisting predominantly of silica. The removal of OTC depends on the pH of the medium, which is favored at acid pH values. The kinetic data followed the Bangham model, which indicated an OTC diffusion in the pores of RHA, although this was not the only process, as demonstrated through the use of the Weber-Morris model (IPD model). The Sips isotherm best represents the experimental results of the equilibrium study. It was found that the adsorption process was spontaneous and endothermic. The highest adsorption capacity was found at a pH in the range of 4–6, when the OTC is in its zwitterion form and the surface of the RHA is positively charged, thus permitting electrostatic interactions and the formation of hydrogen bonds between the adsorbent and adsorbate molecules. These findings demonstrate the potential of rice husk ash to remove oxytetracycline from water.
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