Evaluation of graphenic and graphitic materials on the adsorption of Triton X-100 from aqueous solution

Presently, graphenic nanomaterials are being studied as candidates for wastewater pollutant removal. In this study, two graphite oxides produced from natural graphite with different grain sizes (325 and 10 mesh), their respective reduced graphene oxides and one reduced graphene oxide with nitrogen f...

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Veröffentlicht in:Environmental pollution (1987) 2021-09, Vol.284, p.117161-117161, Article 117161
Hauptverfasser: Esteban-Arranz, Adrián, Pérez-Cadenas, María, Muñoz-Andrés, Vicenta, Guerrero-Ruiz, Antonio
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container_end_page 117161
container_issue
container_start_page 117161
container_title Environmental pollution (1987)
container_volume 284
creator Esteban-Arranz, Adrián
Pérez-Cadenas, María
Muñoz-Andrés, Vicenta
Guerrero-Ruiz, Antonio
description Presently, graphenic nanomaterials are being studied as candidates for wastewater pollutant removal. In this study, two graphite oxides produced from natural graphite with different grain sizes (325 and 10 mesh), their respective reduced graphene oxides and one reduced graphene oxide with nitrogen functional groups were synthesized and tested to remove a surfactant model substrate, Triton X-100, from an aqueous solution. Kinetic experiments were carried out and adjusted to pseudo-first order equation, pseudo-second order equation, Elovich, Chain-Clayton and intra-particle diffusion models. Reduced graphene oxides displayed an instantaneous adsorption due to their accessible and hydrophobic surfaces, while graphite oxides hindered the TX100 adsorption rate due to their highly superficial oxygen content. Results from the adsorption isotherms showed that the Sips model perfectly described the TX100 adsorption behavior of these materials. Higher adsorption capacities were developed with reduced graphene oxides, being maximum for the material produced from the lower graphite grain size (qe = 3.55·10−6 mol/m2), which could be explained by a higher surface area (600 m2/g), a lower amount of superficial oxygen (O/C = 0.04) and a more defected structure (ID/IG = 0.85). Additionally, three commercial high surface area graphites in the range of 100–500 m2/g were evaluated for comparison purposes. In this case, better adsorption results were obtained with a more graphitic material, HSAG100 (qe = 1.72·10−6 mol/m2). However, the best experimental results of this study were obtained using synthesized graphenic materials. [Display omitted] •rGO325 shows greater surface area, less residual oxygen and more expanded structure.•rGO325 displays the quickest and highest adsorption capacity.•Surface and structural defects play a decisive role on pollutant adsorption.•HSAG100 displays better adsorption capacity in comparison to the other graphites.•A correlation between the adsorption capacity and the graphitization is established.
doi_str_mv 10.1016/j.envpol.2021.117161
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In this study, two graphite oxides produced from natural graphite with different grain sizes (325 and 10 mesh), their respective reduced graphene oxides and one reduced graphene oxide with nitrogen functional groups were synthesized and tested to remove a surfactant model substrate, Triton X-100, from an aqueous solution. Kinetic experiments were carried out and adjusted to pseudo-first order equation, pseudo-second order equation, Elovich, Chain-Clayton and intra-particle diffusion models. Reduced graphene oxides displayed an instantaneous adsorption due to their accessible and hydrophobic surfaces, while graphite oxides hindered the TX100 adsorption rate due to their highly superficial oxygen content. Results from the adsorption isotherms showed that the Sips model perfectly described the TX100 adsorption behavior of these materials. Higher adsorption capacities were developed with reduced graphene oxides, being maximum for the material produced from the lower graphite grain size (qe = 3.55·10−6 mol/m2), which could be explained by a higher surface area (600 m2/g), a lower amount of superficial oxygen (O/C = 0.04) and a more defected structure (ID/IG = 0.85). Additionally, three commercial high surface area graphites in the range of 100–500 m2/g were evaluated for comparison purposes. In this case, better adsorption results were obtained with a more graphitic material, HSAG100 (qe = 1.72·10−6 mol/m2). However, the best experimental results of this study were obtained using synthesized graphenic materials. 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Higher adsorption capacities were developed with reduced graphene oxides, being maximum for the material produced from the lower graphite grain size (qe = 3.55·10−6 mol/m2), which could be explained by a higher surface area (600 m2/g), a lower amount of superficial oxygen (O/C = 0.04) and a more defected structure (ID/IG = 0.85). Additionally, three commercial high surface area graphites in the range of 100–500 m2/g were evaluated for comparison purposes. In this case, better adsorption results were obtained with a more graphitic material, HSAG100 (qe = 1.72·10−6 mol/m2). However, the best experimental results of this study were obtained using synthesized graphenic materials. 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Higher adsorption capacities were developed with reduced graphene oxides, being maximum for the material produced from the lower graphite grain size (qe = 3.55·10−6 mol/m2), which could be explained by a higher surface area (600 m2/g), a lower amount of superficial oxygen (O/C = 0.04) and a more defected structure (ID/IG = 0.85). Additionally, three commercial high surface area graphites in the range of 100–500 m2/g were evaluated for comparison purposes. In this case, better adsorption results were obtained with a more graphitic material, HSAG100 (qe = 1.72·10−6 mol/m2). However, the best experimental results of this study were obtained using synthesized graphenic materials. [Display omitted] •rGO325 shows greater surface area, less residual oxygen and more expanded structure.•rGO325 displays the quickest and highest adsorption capacity.•Surface and structural defects play a decisive role on pollutant adsorption.•HSAG100 displays better adsorption capacity in comparison to the other graphites.•A correlation between the adsorption capacity and the graphitization is established.</abstract><cop>England</cop><pub>Elsevier Ltd</pub><pmid>33901979</pmid><doi>10.1016/j.envpol.2021.117161</doi><tpages>1</tpages><orcidid>https://orcid.org/0000-0001-8377-587X</orcidid></addata></record>
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subjects Critical micellar concentration
Functionalization
High surface area graphite
Reduced graphene oxide
Structural defects
title Evaluation of graphenic and graphitic materials on the adsorption of Triton X-100 from aqueous solution
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