Graphene oxide/alginate beads as adsorbents: Influence of the load and the drying method on their physicochemical-mechanical properties and adsorptive performance
Graphene oxide/alginate beads were prepared from lab-synthesized graphene oxide, varying its content within the beads (0.05, 0.125, and 0.25 wt.%). Ethanol-drying and lyophilization were compared as drying methods to obtain suitable adsorbents which were later tested to the removal of a model organi...
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2017
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v491_n_p1_Platero http://hdl.handle.net/20.500.12110/paper_00219797_v491_n_p1_Platero |
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paper:paper_00219797_v491_n_p1_Platero2023-06-08T14:44:58Z Graphene oxide/alginate beads as adsorbents: Influence of the load and the drying method on their physicochemical-mechanical properties and adsorptive performance Fernández, María Emilia Bonelli, Pablo R. Cukierman, Ana Lea Alginate beads Basic dye removal Graphene oxide Mechanical properties Adsorption Adsorption isotherms Aromatic compounds Compression testing Drying Ethanol Mechanical properties Scanning electron microscopy Adsorption capacities Adsorption experiment Adsorption/desorption Alginate beads Basic dyes Graphene oxides Removal performance Uni-axial compression tests Graphene adsorbent alcohol alginic acid graphene oxide methylene blue alginic acid glucuronic acid graphite hexuronic acid oxide adsorption kinetics Article compression covalent bond desorption freeze drying hydrophobicity hysteresis mathematical model oxidation particle size physical chemistry priority journal scanning electron microscopy static electricity surface area thermal conductivity thermostability Young modulus adsorption chemistry freeze drying physical chemistry surface property Adsorption Alginates Chemistry, Physical Ethanol Freeze Drying Glucuronic Acid Graphite Hexuronic Acids Oxides Particle Size Surface Properties Graphene oxide/alginate beads were prepared from lab-synthesized graphene oxide, varying its content within the beads (0.05, 0.125, and 0.25 wt.%). Ethanol-drying and lyophilization were compared as drying methods to obtain suitable adsorbents which were later tested to the removal of a model organic molecule (methylene blue). The morphological and textural properties of all the beads were characterized by scanning electron microscopy and N2 adsorption/desorption isotherms at −196 °C, respectively. Limited porosity was obtained for all cases (SBET < 60 m2/g). Uniaxial compression tests were performed to assess the mechanical properties of the beads. Ethanol-dried ones exhibited higher Young's elasticity modulus (E = 192 kPa) than the lyophilized samples (twice at 0.25 wt.% graphene oxide loading), which disclosed breakage points at lower deformation percentages. Adsorption experiments were conducted and dye adsorption isotherms were obtained for the beads with the best removal performance. The experimental data were better fitted by the Langmuir model. The highest maximum adsorption capacity (4.25 mmol/g) was obtained for the lyophilized beads with the highest graphene oxide content. Mechanical properties were found to be affected also by the dye adsorption. © 2016 Elsevier Inc. Fil:Fernandez, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bonelli, P.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cukierman, A.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v491_n_p1_Platero http://hdl.handle.net/20.500.12110/paper_00219797_v491_n_p1_Platero |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Alginate beads Basic dye removal Graphene oxide Mechanical properties Adsorption Adsorption isotherms Aromatic compounds Compression testing Drying Ethanol Mechanical properties Scanning electron microscopy Adsorption capacities Adsorption experiment Adsorption/desorption Alginate beads Basic dyes Graphene oxides Removal performance Uni-axial compression tests Graphene adsorbent alcohol alginic acid graphene oxide methylene blue alginic acid glucuronic acid graphite hexuronic acid oxide adsorption kinetics Article compression covalent bond desorption freeze drying hydrophobicity hysteresis mathematical model oxidation particle size physical chemistry priority journal scanning electron microscopy static electricity surface area thermal conductivity thermostability Young modulus adsorption chemistry freeze drying physical chemistry surface property Adsorption Alginates Chemistry, Physical Ethanol Freeze Drying Glucuronic Acid Graphite Hexuronic Acids Oxides Particle Size Surface Properties |
| spellingShingle |
Alginate beads Basic dye removal Graphene oxide Mechanical properties Adsorption Adsorption isotherms Aromatic compounds Compression testing Drying Ethanol Mechanical properties Scanning electron microscopy Adsorption capacities Adsorption experiment Adsorption/desorption Alginate beads Basic dyes Graphene oxides Removal performance Uni-axial compression tests Graphene adsorbent alcohol alginic acid graphene oxide methylene blue alginic acid glucuronic acid graphite hexuronic acid oxide adsorption kinetics Article compression covalent bond desorption freeze drying hydrophobicity hysteresis mathematical model oxidation particle size physical chemistry priority journal scanning electron microscopy static electricity surface area thermal conductivity thermostability Young modulus adsorption chemistry freeze drying physical chemistry surface property Adsorption Alginates Chemistry, Physical Ethanol Freeze Drying Glucuronic Acid Graphite Hexuronic Acids Oxides Particle Size Surface Properties Fernández, María Emilia Bonelli, Pablo R. Cukierman, Ana Lea Graphene oxide/alginate beads as adsorbents: Influence of the load and the drying method on their physicochemical-mechanical properties and adsorptive performance |
| topic_facet |
Alginate beads Basic dye removal Graphene oxide Mechanical properties Adsorption Adsorption isotherms Aromatic compounds Compression testing Drying Ethanol Mechanical properties Scanning electron microscopy Adsorption capacities Adsorption experiment Adsorption/desorption Alginate beads Basic dyes Graphene oxides Removal performance Uni-axial compression tests Graphene adsorbent alcohol alginic acid graphene oxide methylene blue alginic acid glucuronic acid graphite hexuronic acid oxide adsorption kinetics Article compression covalent bond desorption freeze drying hydrophobicity hysteresis mathematical model oxidation particle size physical chemistry priority journal scanning electron microscopy static electricity surface area thermal conductivity thermostability Young modulus adsorption chemistry freeze drying physical chemistry surface property Adsorption Alginates Chemistry, Physical Ethanol Freeze Drying Glucuronic Acid Graphite Hexuronic Acids Oxides Particle Size Surface Properties |
| description |
Graphene oxide/alginate beads were prepared from lab-synthesized graphene oxide, varying its content within the beads (0.05, 0.125, and 0.25 wt.%). Ethanol-drying and lyophilization were compared as drying methods to obtain suitable adsorbents which were later tested to the removal of a model organic molecule (methylene blue). The morphological and textural properties of all the beads were characterized by scanning electron microscopy and N2 adsorption/desorption isotherms at −196 °C, respectively. Limited porosity was obtained for all cases (SBET < 60 m2/g). Uniaxial compression tests were performed to assess the mechanical properties of the beads. Ethanol-dried ones exhibited higher Young's elasticity modulus (E = 192 kPa) than the lyophilized samples (twice at 0.25 wt.% graphene oxide loading), which disclosed breakage points at lower deformation percentages. Adsorption experiments were conducted and dye adsorption isotherms were obtained for the beads with the best removal performance. The experimental data were better fitted by the Langmuir model. The highest maximum adsorption capacity (4.25 mmol/g) was obtained for the lyophilized beads with the highest graphene oxide content. Mechanical properties were found to be affected also by the dye adsorption. © 2016 Elsevier Inc. |
| author |
Fernández, María Emilia Bonelli, Pablo R. Cukierman, Ana Lea |
| author_facet |
Fernández, María Emilia Bonelli, Pablo R. Cukierman, Ana Lea |
| author_sort |
Fernández, María Emilia |
| title |
Graphene oxide/alginate beads as adsorbents: Influence of the load and the drying method on their physicochemical-mechanical properties and adsorptive performance |
| title_short |
Graphene oxide/alginate beads as adsorbents: Influence of the load and the drying method on their physicochemical-mechanical properties and adsorptive performance |
| title_full |
Graphene oxide/alginate beads as adsorbents: Influence of the load and the drying method on their physicochemical-mechanical properties and adsorptive performance |
| title_fullStr |
Graphene oxide/alginate beads as adsorbents: Influence of the load and the drying method on their physicochemical-mechanical properties and adsorptive performance |
| title_full_unstemmed |
Graphene oxide/alginate beads as adsorbents: Influence of the load and the drying method on their physicochemical-mechanical properties and adsorptive performance |
| title_sort |
graphene oxide/alginate beads as adsorbents: influence of the load and the drying method on their physicochemical-mechanical properties and adsorptive performance |
| publishDate |
2017 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v491_n_p1_Platero http://hdl.handle.net/20.500.12110/paper_00219797_v491_n_p1_Platero |
| work_keys_str_mv |
AT fernandezmariaemilia grapheneoxidealginatebeadsasadsorbentsinfluenceoftheloadandthedryingmethodontheirphysicochemicalmechanicalpropertiesandadsorptiveperformance AT bonellipablor grapheneoxidealginatebeadsasadsorbentsinfluenceoftheloadandthedryingmethodontheirphysicochemicalmechanicalpropertiesandadsorptiveperformance AT cukiermananalea grapheneoxidealginatebeadsasadsorbentsinfluenceoftheloadandthedryingmethodontheirphysicochemicalmechanicalpropertiesandadsorptiveperformance |
| _version_ |
1768542491049459712 |