AI Article Synopsis
- - Adsorption using amino silane-graphene oxide composites, such as pN-GO, psN-GO, and pssN-GO, is an effective approach to remove hexavalent chromium (Cr(VI)) from contaminated water.
- - The study found that the composite with pssN-GO had the highest Cr(VI) adsorption capacity (260.74 mg/g) due to the synergistic effect of secondary amines, while primary amines showed lower efficiency.
- - Kinetic analysis revealed that pssN-GO favored monolayer adsorption, whereas psN-GO and pN-GO experienced multilayer adsorption, with adsorption behavior best described by the pseudo-second-order model for p
Article Abstract
Adsorption is a simple and effective method for the removal of hexavalent chromium (Cr(VI)) from contaminated water. Several amino silane-graphene oxide (GO) composites with different species of amino groups (pN-GO, psN-GO, and pssN-GO; p: primary, s: secondary, N: amine) were evaluated to investigate their adsorption capacity and the effects of primary and secondary amines on Cr(VI) adsorption. We conducted a quantitative analysis to reveal the difference between primary and secondary amines in terms of Cr(VI) removal efficiency. A synergic effect was observed between the neighboring secondary amines in pssN-GO. From the Langmuir model prediction, we found that the composite with pssN-GO exhibited the highest maximum adsorption capacity (260.74 mg/g), followed by those with psN-GO (208.22 mg/g) and pN-GO (189.47 mg/g). Monolayer adsorption was more dominant when using pssN-GO, with the pseudo-second-order model best fitting the kinetic experiment results, whereas multilayer adsorption was dominant when using psN-GO and pN-GO.
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| http://dx.doi.org/10.1016/j.chemosphere.2020.126387 | DOI Listing |
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