期刊
GELS
卷 9, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/gels9090680
关键词
graphene oxide aerogel; reduced graphene oxide aerogel; 2,4-D; salicylic acid; adsorption; water treatment
This study proposes new aerogels based on graphene oxide for adsorbing salicylic acid and herbicide from aqueous media. By conducting experiments and analyzing the data, it was found that the equilibrium of adsorption is reached in 150 minutes. Various models were used to describe the adsorption kinetics and equilibrium isotherms.
Within this work, new aerogels based on graphene oxide are proposed to adsorb salicylic acid (SA) and herbicide 2,4-Dichlorophenoxyacetic acid (2,4-D) from aqueous media. Graphene oxide aerogel (GOA) and reduced graphene oxide aerogel (rGOA) were obtained by freeze-drying processes and then studied by Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) analysis. The influence of contact time and the concentration of the adsorbates were also assessed. It was found that equilibrium for high adsorption is reached in 150 min. In a single system, the pseudo-first-order, pseudo-second-order kinetic models, Intraparticle diffusion, and Elovich models were used to discuss the detail of the aerogel adsorbing pollutant. Moreover, the Langmuir, Freundlich, and Temkin adsorption models were applied to describe the equilibrium isotherms and calculate the isotherm constants.
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