Removal of ciprofloxacin from an aqueous medium by adsorption on natural and hydrolyzed bentonites
Two bentonites (sodic bentonite, BSN, and calcic bentonite, BCN) were treated with nitric acid to improve the adsorption capacities using ciprofloxacin (CIP) as an adsorbate. The results demonstrated that nitric acid treatment enhances the specific area and increases the pore volume of both bentonit...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2023-08-01
|
| Series: | Frontiers in Environmental Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fenvs.2023.1239754/full |
| _version_ | 1797741684133462016 |
|---|---|
| author | Lourdes Jara-Cobos David Abad-Delgado Jonathan Ponce-Montalvo Miguel Menendez María E. Peñafiel |
| author_facet | Lourdes Jara-Cobos David Abad-Delgado Jonathan Ponce-Montalvo Miguel Menendez María E. Peñafiel |
| author_sort | Lourdes Jara-Cobos |
| collection | DOAJ |
| description | Two bentonites (sodic bentonite, BSN, and calcic bentonite, BCN) were treated with nitric acid to improve the adsorption capacities using ciprofloxacin (CIP) as an adsorbate. The results demonstrated that nitric acid treatment enhances the specific area and increases the pore volume of both bentonites. The mechanism of adsorption of CIP was investigated using a kinetic model, isotherms, and pH influence. The adsorption capacity for BSN increased from 294.1 mg.g−1 to 416.6 mg.g−1 after acid treatment, while the increase in the adsorption capacity of BCN was minor. The increase in CIP removal may be due to an increase in the specific area and the presence of acidic surface functional groups. The adsorption mechanism of CIP on all adsorbents was governed by external diffusion, internal diffusion, and adsorption to reach equilibrium. The adjustment of strong adsorbents to the BET model indicated multilayer adsorption. The best adsorbent is sodic bentonite with nitric acid treatment. The study of the pH effect showed that the mechanism of CIP adsorption is hydrogen bonds and electrostatic interaction. Therefore, the acid treatment was found promising to improve the adsorbent characteristic of clays for removing CIP from water. |
| first_indexed | 2024-03-12T14:30:17Z |
| format | Article |
| id | doaj.art-654155d8c8a34475bb0d88d3df710c80 |
| institution | Directory Open Access Journal |
| issn | 2296-665X |
| language | English |
| last_indexed | 2024-03-12T14:30:17Z |
| publishDate | 2023-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Environmental Science |
| spelling | doaj.art-654155d8c8a34475bb0d88d3df710c802023-08-17T13:25:11ZengFrontiers Media S.A.Frontiers in Environmental Science2296-665X2023-08-011110.3389/fenvs.2023.12397541239754Removal of ciprofloxacin from an aqueous medium by adsorption on natural and hydrolyzed bentonitesLourdes Jara-Cobos0David Abad-Delgado1Jonathan Ponce-Montalvo2Miguel Menendez3María E. Peñafiel4Grupo de Ingeniería de las Reacciones Químicas, Catálisis y Tecnologías del Medio Ambiente (IRCMA), Departamento de Biociencias, Universidad de Cuenca, Ecocampus Balzay, Cuenca, EcuadorGrupo de Ingeniería de las Reacciones Químicas, Catálisis y Tecnologías del Medio Ambiente (IRCMA), Departamento de Biociencias, Universidad de Cuenca, Ecocampus Balzay, Cuenca, EcuadorGrupo de Ingeniería de las Reacciones Químicas, Catálisis y Tecnologías del Medio Ambiente (IRCMA), Departamento de Biociencias, Universidad de Cuenca, Ecocampus Balzay, Cuenca, EcuadorCatalysis, Molecular Separations and Reactor Engineering Group (CREG), Aragon Institute of Engineering Research (I3A), Universidad Zaragoza, Zaragoza, SpainGrupo de Ingeniería de las Reacciones Químicas, Catálisis y Tecnologías del Medio Ambiente (IRCMA), Departamento de Biociencias, Universidad de Cuenca, Ecocampus Balzay, Cuenca, EcuadorTwo bentonites (sodic bentonite, BSN, and calcic bentonite, BCN) were treated with nitric acid to improve the adsorption capacities using ciprofloxacin (CIP) as an adsorbate. The results demonstrated that nitric acid treatment enhances the specific area and increases the pore volume of both bentonites. The mechanism of adsorption of CIP was investigated using a kinetic model, isotherms, and pH influence. The adsorption capacity for BSN increased from 294.1 mg.g−1 to 416.6 mg.g−1 after acid treatment, while the increase in the adsorption capacity of BCN was minor. The increase in CIP removal may be due to an increase in the specific area and the presence of acidic surface functional groups. The adsorption mechanism of CIP on all adsorbents was governed by external diffusion, internal diffusion, and adsorption to reach equilibrium. The adjustment of strong adsorbents to the BET model indicated multilayer adsorption. The best adsorbent is sodic bentonite with nitric acid treatment. The study of the pH effect showed that the mechanism of CIP adsorption is hydrogen bonds and electrostatic interaction. Therefore, the acid treatment was found promising to improve the adsorbent characteristic of clays for removing CIP from water.https://www.frontiersin.org/articles/10.3389/fenvs.2023.1239754/fulladsorptionciprofloxacinhydrolyzed bentonitenatural bentoniteremoval |
| spellingShingle | Lourdes Jara-Cobos David Abad-Delgado Jonathan Ponce-Montalvo Miguel Menendez María E. Peñafiel Removal of ciprofloxacin from an aqueous medium by adsorption on natural and hydrolyzed bentonites Frontiers in Environmental Science adsorption ciprofloxacin hydrolyzed bentonite natural bentonite removal |
| title | Removal of ciprofloxacin from an aqueous medium by adsorption on natural and hydrolyzed bentonites |
| title_full | Removal of ciprofloxacin from an aqueous medium by adsorption on natural and hydrolyzed bentonites |
| title_fullStr | Removal of ciprofloxacin from an aqueous medium by adsorption on natural and hydrolyzed bentonites |
| title_full_unstemmed | Removal of ciprofloxacin from an aqueous medium by adsorption on natural and hydrolyzed bentonites |
| title_short | Removal of ciprofloxacin from an aqueous medium by adsorption on natural and hydrolyzed bentonites |
| title_sort | removal of ciprofloxacin from an aqueous medium by adsorption on natural and hydrolyzed bentonites |
| topic | adsorption ciprofloxacin hydrolyzed bentonite natural bentonite removal |
| url | https://www.frontiersin.org/articles/10.3389/fenvs.2023.1239754/full |
| work_keys_str_mv | AT lourdesjaracobos removalofciprofloxacinfromanaqueousmediumbyadsorptiononnaturalandhydrolyzedbentonites AT davidabaddelgado removalofciprofloxacinfromanaqueousmediumbyadsorptiononnaturalandhydrolyzedbentonites AT jonathanponcemontalvo removalofciprofloxacinfromanaqueousmediumbyadsorptiononnaturalandhydrolyzedbentonites AT miguelmenendez removalofciprofloxacinfromanaqueousmediumbyadsorptiononnaturalandhydrolyzedbentonites AT mariaepenafiel removalofciprofloxacinfromanaqueousmediumbyadsorptiononnaturalandhydrolyzedbentonites |