Lee, JinHyeong Park, Jeong-Ann Kim, Hee-Gon Lee, Jung-Hyun Cho, So-Hye Choi, Keunsu Jung, Kyung-Won Lee, Seung Yong Choi, Jae-Woo 2024-01-19T17:04:18Z 2024-01-19T17:04:18Z 2021-09-05 2020-07 0045-6535 https://pubs.kist.re.kr/handle/201004/118447 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. (C) 2020 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD Most suitable amino silane molecules for surface functionalization of graphene oxide toward hexavalent chromium adsorption Article 10.1016/j.chemosphere.2020.126387 1 CHEMOSPHERE, v.251 CHEMOSPHERE 251 N scie scopus 000533642900078 2-s2.0-85080982179 Environmental Sciences Environmental Sciences & Ecology Article WALLED CARBON NANOTUBES WASTE-WATER AQUEOUS-SOLUTION CR(VI) REMOVAL EFFECTIVE ADSORBENTS COMPOSITE REDUCTION SILICA PERFORMANCE SORBENTS Graphene oxide Amino silane Functionalization Hexavalent chromium Adsorption