Most suitable amino silane molecules for surface functionalization of graphene oxide toward hexavalent chromium adsorption
- Most suitable amino silane molecules for surface functionalization of graphene oxide toward hexavalent chromium adsorption
- 이승용; 조소혜; 최재우; 정경원; 이진형; 김희곤; Jeong-Ann Park; Jung-Hyun Lee; Keunsu Choi
- Graphene oxide; Amino silane; Functionalization; Hexavalent chromium; Adsorption
- Issue Date
- VOL 251, 126387
- 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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