Most suitable amino silane molecules for surface functionalization of graphene oxide toward hexavalent chromium adsorption

Title
Most suitable amino silane molecules for surface functionalization of graphene oxide toward hexavalent chromium adsorption
Authors
이승용조소혜최재우정경원이진형김희곤Jeong-Ann ParkJung-Hyun LeeKeunsu Choi
Keywords
Graphene oxide; Amino silane; Functionalization; Hexavalent chromium; Adsorption
Issue Date
2020-07
Publisher
Chemosphere
Citation
VOL 251, 126387
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.
URI
http://pubs.kist.re.kr/handle/201004/71023
ISSN
0045-6535
Appears in Collections:
KIST Publication > Article
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