Performance Differences of Hexavalent Chromium Adsorbents Caused by Graphene Oxide Drying Process

Jin Hyeong Lee; Hee Gon Kim; Jung Hyun Lee; So Hye Cho; Kyung Won Jung; Seung Yong Lee; Jae Woo Choi

doi:10.1038/s41598-020-61760-2

Performance Differences of Hexavalent Chromium Adsorbents Caused by Graphene Oxide Drying Process

Jin Hyeong Lee, Hee Gon Kim, Jung Hyun Lee, So Hye Cho, Kyung Won Jung, Seung Yong Lee, Jae Woo Choi

Department of Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

In this study, the influence of drying conditions on amine (−NH₃) functionalization of graphene oxide (GO) was evaluated, and the hexavalent chromium (Cr(VI)) adsorption efficiency of the prepared materials was compared. 3-[2-(2-aminoehtylamino) ethylamino]propyl-trimethoxysilane (3N) was used for amine functionalization. The synthesized materials were analyzed by SEM, BET, TGA, XPS, and EA. TGA results showed that the solution-GO (SGO) was functionalized by more 3N molecules than freeze-dried GO (FDGO) and oven-dried GO (ODGO). Additionally, XPS analysis also showed that the ratio of N/C and Si/C was relatively high in SGO than FDGO and ODGO. The maximum adsorption capacity of SGO, FDGO, and ODGO for Cr(VI) was 258.48, 212.46, and 173.45 mg g⁻¹, respectively. These results indicate that it is better to use SGO without drying processes for efficient amine functionalization and Cr(VI) removal. However, when the drying process is required, freeze-drying is better than oven-drying.

Original language	English
Article number	4882
Journal	Scientific reports
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41598-020-61760-2
Publication status	Published - 2020 Dec 1

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title = "Performance Differences of Hexavalent Chromium Adsorbents Caused by Graphene Oxide Drying Process",

abstract = "In this study, the influence of drying conditions on amine (−NH3) functionalization of graphene oxide (GO) was evaluated, and the hexavalent chromium (Cr(VI)) adsorption efficiency of the prepared materials was compared. 3-[2-(2-aminoehtylamino) ethylamino]propyl-trimethoxysilane (3N) was used for amine functionalization. The synthesized materials were analyzed by SEM, BET, TGA, XPS, and EA. TGA results showed that the solution-GO (SGO) was functionalized by more 3N molecules than freeze-dried GO (FDGO) and oven-dried GO (ODGO). Additionally, XPS analysis also showed that the ratio of N/C and Si/C was relatively high in SGO than FDGO and ODGO. The maximum adsorption capacity of SGO, FDGO, and ODGO for Cr(VI) was 258.48, 212.46, and 173.45 mg g−1, respectively. These results indicate that it is better to use SGO without drying processes for efficient amine functionalization and Cr(VI) removal. However, when the drying process is required, freeze-drying is better than oven-drying.",

author = "Lee, {Jin Hyeong} and Kim, {Hee Gon} and Lee, {Jung Hyun} and Cho, {So Hye} and Jung, {Kyung Won} and Lee, {Seung Yong} and Choi, {Jae Woo}",

note = "Funding Information: This study was supported by KIST institutional program (No. 2E30710) and the Technology Innovation Program (10082572, Development of Low Energy Desalination Water Treatment Engineering Package System for Industrial Recycle Water Production) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). Publisher Copyright: {\textcopyright} 2020, The Author(s).",

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AU - Lee, Jin Hyeong

AU - Kim, Hee Gon

AU - Lee, Jung Hyun

AU - Cho, So Hye

AU - Jung, Kyung Won

AU - Lee, Seung Yong

AU - Choi, Jae Woo

N1 - Funding Information: This study was supported by KIST institutional program (No. 2E30710) and the Technology Innovation Program (10082572, Development of Low Energy Desalination Water Treatment Engineering Package System for Industrial Recycle Water Production) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). Publisher Copyright: © 2020, The Author(s).

PY - 2020/12/1

Y1 - 2020/12/1

N2 - In this study, the influence of drying conditions on amine (−NH3) functionalization of graphene oxide (GO) was evaluated, and the hexavalent chromium (Cr(VI)) adsorption efficiency of the prepared materials was compared. 3-[2-(2-aminoehtylamino) ethylamino]propyl-trimethoxysilane (3N) was used for amine functionalization. The synthesized materials were analyzed by SEM, BET, TGA, XPS, and EA. TGA results showed that the solution-GO (SGO) was functionalized by more 3N molecules than freeze-dried GO (FDGO) and oven-dried GO (ODGO). Additionally, XPS analysis also showed that the ratio of N/C and Si/C was relatively high in SGO than FDGO and ODGO. The maximum adsorption capacity of SGO, FDGO, and ODGO for Cr(VI) was 258.48, 212.46, and 173.45 mg g−1, respectively. These results indicate that it is better to use SGO without drying processes for efficient amine functionalization and Cr(VI) removal. However, when the drying process is required, freeze-drying is better than oven-drying.

AB - In this study, the influence of drying conditions on amine (−NH3) functionalization of graphene oxide (GO) was evaluated, and the hexavalent chromium (Cr(VI)) adsorption efficiency of the prepared materials was compared. 3-[2-(2-aminoehtylamino) ethylamino]propyl-trimethoxysilane (3N) was used for amine functionalization. The synthesized materials were analyzed by SEM, BET, TGA, XPS, and EA. TGA results showed that the solution-GO (SGO) was functionalized by more 3N molecules than freeze-dried GO (FDGO) and oven-dried GO (ODGO). Additionally, XPS analysis also showed that the ratio of N/C and Si/C was relatively high in SGO than FDGO and ODGO. The maximum adsorption capacity of SGO, FDGO, and ODGO for Cr(VI) was 258.48, 212.46, and 173.45 mg g−1, respectively. These results indicate that it is better to use SGO without drying processes for efficient amine functionalization and Cr(VI) removal. However, when the drying process is required, freeze-drying is better than oven-drying.

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Performance Differences of Hexavalent Chromium Adsorbents Caused by Graphene Oxide Drying Process

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