alexa Adsorption behavior of copper ions on graphene oxide–chitosan aerogel
Environmental Sciences

Environmental Sciences

Journal of Pollution Effects & Control

Author(s): Baowei Yu, Jing Xu, JiaHui Liu, ShengTao Yang, Jianbin Luo

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Graphene oxide (GO)–chitosan (CS) composite was lyophilized to prepare GO–CS aerogel for Cu2+ removal, then the separation of adsorbents after adsorption was easily achieved by filtration or low speed centrifugation. GO–CS was a good adsorbent of Cu2+ with a large adsorption capacity of 2.54 × 101 mg/g according to the Langmuir model. The adsorption kinetics was well described by the pseudo-second-order model with a k2 of 4.14 × 10−3 min−1. The intraparticle diffusion model was adopted to reveal the diffusion mechanism. Higher pH, lower ionic strength and higher temperature benefited the adsorption. The thermodynamics parameters at 303 K were calculated as ΔG of −3.89 kJ/mol, ΔH of 3.46 kJ/mol and ΔS of 2.42 × 101 J/mol/K. The adsorption identity was physisorption and apparently driven by the increase of randomness. The implications to the application of graphene adsorbents in the decontamination of heavy metals are discussed.

This article was published in Journal of Environmental Chemical Engineering and referenced in Journal of Pollution Effects & Control

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