Chromium removal from aqueous solution by a PEI-silica nanocomposite

Keunsu Choi; Soonjae Lee; Jin Ock Park; Jeong Ann Park; So Hye Cho; Seung Yong Lee; Jun Hee Lee; Jae Woo Choi

doi:10.1038/s41598-018-20017-9

Chromium removal from aqueous solution by a PEI-silica nanocomposite

Keunsu Choi, Soonjae Lee, Jin Ock Park, Jeong Ann Park, So Hye Cho, Seung Yong Lee, Jun Hee Lee, Jae Woo Choi

Department of Earth and Environmental Sciences

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

120 Citations (Scopus)

Abstract

It is essential and important to determine the adsorption mechanism as well as removal efficiency when using an adsorption technique to remove toxic heavy metals from wastewater. In this research, the removal efficiency and mechanism of chromium removal by a silica-based nanoparticle were investigated. A PEI-silica nanoparticle was synthesized by a one-pot technique and exhibited uniformly well-dispersed PEI polymers in silica particles. The adsorption capacity of chromium ions was determined by a batch adsorption test, with the PEI-silica nanoparticle having a value of 183.7 mg/g and monolayer sorption. Adsorption of chromium ions was affected by the solution pH and altered the nanoparticle surface chemically. First principles calculations of the adsorption energies for the relevant adsorption configurations and XPS peaks of Cr and N showed that Cr(VI), [HCrO₄]^- is reduced to two species, Cr(III), CrOH²⁺ and Cr³⁺, by an amine group and that Cr(III) and Cr(VI) ions are adsorbed on different functional groups, oxidized N and NH₃ ⁺.

Original language	English
Article number	1438
Journal	Scientific reports
Volume	8
Issue number	1
DOIs	https://doi.org/10.1038/s41598-018-20017-9
Publication status	Published - 2018 Dec 1

Bibliographical note

Funding Information:
This research was supported by the Korea Institute of Science and Technology (KIST) institutional program (Grant No. 2E28120) and the Korea Ministry of Environment (MOE) as “Public Technology Program based on Environmental Policy (E416-00020-0606-0)”. J.H.L. at UNIST was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2015R1C1A1A01055760). This study was also partly supported by a Korea CCS R&D Center (Korea CCS 2020 Project) grant funded by the Korean Government (Ministry of Science, ICT & Future Planning) in 2017 (KCRC-2014M1A8A1049315).

Publisher Copyright:
© 2018 The Author(s).

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title = "Chromium removal from aqueous solution by a PEI-silica nanocomposite",

abstract = "It is essential and important to determine the adsorption mechanism as well as removal efficiency when using an adsorption technique to remove toxic heavy metals from wastewater. In this research, the removal efficiency and mechanism of chromium removal by a silica-based nanoparticle were investigated. A PEI-silica nanoparticle was synthesized by a one-pot technique and exhibited uniformly well-dispersed PEI polymers in silica particles. The adsorption capacity of chromium ions was determined by a batch adsorption test, with the PEI-silica nanoparticle having a value of 183.7 mg/g and monolayer sorption. Adsorption of chromium ions was affected by the solution pH and altered the nanoparticle surface chemically. First principles calculations of the adsorption energies for the relevant adsorption configurations and XPS peaks of Cr and N showed that Cr(VI), [HCrO4]- is reduced to two species, Cr(III), CrOH2+ and Cr3+, by an amine group and that Cr(III) and Cr(VI) ions are adsorbed on different functional groups, oxidized N and NH3 +.",

author = "Keunsu Choi and Soonjae Lee and Park, {Jin Ock} and Park, {Jeong Ann} and Cho, {So Hye} and Lee, {Seung Yong} and Lee, {Jun Hee} and Choi, {Jae Woo}",

note = "Funding Information: This research was supported by the Korea Institute of Science and Technology (KIST) institutional program (Grant No. 2E28120) and the Korea Ministry of Environment (MOE) as “Public Technology Program based on Environmental Policy (E416-00020-0606-0)”. J.H.L. at UNIST was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2015R1C1A1A01055760). This study was also partly supported by a Korea CCS R&D Center (Korea CCS 2020 Project) grant funded by the Korean Government (Ministry of Science, ICT & Future Planning) in 2017 (KCRC-2014M1A8A1049315). Publisher Copyright: {\textcopyright} 2018 The Author(s).",

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AU - Lee, Jun Hee

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N2 - It is essential and important to determine the adsorption mechanism as well as removal efficiency when using an adsorption technique to remove toxic heavy metals from wastewater. In this research, the removal efficiency and mechanism of chromium removal by a silica-based nanoparticle were investigated. A PEI-silica nanoparticle was synthesized by a one-pot technique and exhibited uniformly well-dispersed PEI polymers in silica particles. The adsorption capacity of chromium ions was determined by a batch adsorption test, with the PEI-silica nanoparticle having a value of 183.7 mg/g and monolayer sorption. Adsorption of chromium ions was affected by the solution pH and altered the nanoparticle surface chemically. First principles calculations of the adsorption energies for the relevant adsorption configurations and XPS peaks of Cr and N showed that Cr(VI), [HCrO4]- is reduced to two species, Cr(III), CrOH2+ and Cr3+, by an amine group and that Cr(III) and Cr(VI) ions are adsorbed on different functional groups, oxidized N and NH3 +.

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Chromium removal from aqueous solution by a PEI-silica nanocomposite

Abstract

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