Synthesis of 3D lotus biochar/reduced graphene oxide aerogel as a green adsorbent for Cr(VI)

Wei Chen; Cheng Xiang; Erhui Ren; Ce Cui; Mi Zhou; Hongyan Xiao; Shouxiang Jiang; Guo Yao; Hong Shen; Ronghui Guo

doi:10.1016/j.matchemphys.2020.123271

Synthesis of 3D lotus biochar/reduced graphene oxide aerogel as a green adsorbent for Cr(VI)

Wei Chen, Cheng Xiang, Erhui Ren, Ce Cui, Mi Zhou, Hongyan Xiao, Shouxiang Jiang, Guo Yao, Hong Shen, Ronghui Guo

Research output: Journal article publication › Journal article › Academic research › peer-review

15 Citations (Scopus)

Abstract

A novel binary composite aerogel of lotus biochar and reduced graphene oxide (BrGA) was fabricated by hydrothermal reaction. The BrGA was used as a adsorbent for the Cr(VI) removal from aqueous solution. The BrGA has a low density with 7.556 mg/cm³ and the adsorption capacity of BrGA is up to 232.56 mg/g for Cr(VI), displaying a high efficiency for removal of Cr(VI), which is much higher than pure reduced graphene oxide aerogel (rGO). In order to reveal the adsorption mechanism, the adsorption process of Cr(VI) removal was described well by pseudo-second-order adsorption kinetic, and the Langmuir adsorption isotherm(R² = 0.994) matches the experimental data better than the Freundlich adsorption isotherm(R² = 0.878). Additionally, the Cr(VI) adsorption mechanisms including direct adsorption process, redox reaction process and re-adsorption process have been offered by discussing X-ray photoelectron spectroscopy(XPS) before and after adsorption. Compared with high adsorption capacity with other adsorbents, the BrGA has been proved to have a promisingly widespread application in practical water purification.

Original language	English
Article number	123271
Journal	Materials Chemistry and Physics
Volume	253
DOIs	https://doi.org/10.1016/j.matchemphys.2020.123271
Publication status	Published - 1 Oct 2020

Keywords

Adsorption
Cr(VI)
Graphene aerogel
Lotus biochar

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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10.1016/j.matchemphys.2020.123271

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title = "Synthesis of 3D lotus biochar/reduced graphene oxide aerogel as a green adsorbent for Cr(VI)",

abstract = "A novel binary composite aerogel of lotus biochar and reduced graphene oxide (BrGA) was fabricated by hydrothermal reaction. The BrGA was used as a adsorbent for the Cr(VI) removal from aqueous solution. The BrGA has a low density with 7.556 mg/cm3 and the adsorption capacity of BrGA is up to 232.56 mg/g for Cr(VI), displaying a high efficiency for removal of Cr(VI), which is much higher than pure reduced graphene oxide aerogel (rGO). In order to reveal the adsorption mechanism, the adsorption process of Cr(VI) removal was described well by pseudo-second-order adsorption kinetic, and the Langmuir adsorption isotherm(R2 = 0.994) matches the experimental data better than the Freundlich adsorption isotherm(R2 = 0.878). Additionally, the Cr(VI) adsorption mechanisms including direct adsorption process, redox reaction process and re-adsorption process have been offered by discussing X-ray photoelectron spectroscopy(XPS) before and after adsorption. Compared with high adsorption capacity with other adsorbents, the BrGA has been proved to have a promisingly widespread application in practical water purification.",

keywords = "Adsorption, Cr(VI), Graphene aerogel, Lotus biochar",

author = "Wei Chen and Cheng Xiang and Erhui Ren and Ce Cui and Mi Zhou and Hongyan Xiao and Shouxiang Jiang and Guo Yao and Hong Shen and Ronghui Guo",

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T1 - Synthesis of 3D lotus biochar/reduced graphene oxide aerogel as a green adsorbent for Cr(VI)

AU - Chen, Wei

AU - Xiang, Cheng

AU - Ren, Erhui

AU - Cui, Ce

AU - Zhou, Mi

AU - Xiao, Hongyan

AU - Jiang, Shouxiang

AU - Yao, Guo

AU - Shen, Hong

AU - Guo, Ronghui

PY - 2020/10/1

Y1 - 2020/10/1

N2 - A novel binary composite aerogel of lotus biochar and reduced graphene oxide (BrGA) was fabricated by hydrothermal reaction. The BrGA was used as a adsorbent for the Cr(VI) removal from aqueous solution. The BrGA has a low density with 7.556 mg/cm3 and the adsorption capacity of BrGA is up to 232.56 mg/g for Cr(VI), displaying a high efficiency for removal of Cr(VI), which is much higher than pure reduced graphene oxide aerogel (rGO). In order to reveal the adsorption mechanism, the adsorption process of Cr(VI) removal was described well by pseudo-second-order adsorption kinetic, and the Langmuir adsorption isotherm(R2 = 0.994) matches the experimental data better than the Freundlich adsorption isotherm(R2 = 0.878). Additionally, the Cr(VI) adsorption mechanisms including direct adsorption process, redox reaction process and re-adsorption process have been offered by discussing X-ray photoelectron spectroscopy(XPS) before and after adsorption. Compared with high adsorption capacity with other adsorbents, the BrGA has been proved to have a promisingly widespread application in practical water purification.

AB - A novel binary composite aerogel of lotus biochar and reduced graphene oxide (BrGA) was fabricated by hydrothermal reaction. The BrGA was used as a adsorbent for the Cr(VI) removal from aqueous solution. The BrGA has a low density with 7.556 mg/cm3 and the adsorption capacity of BrGA is up to 232.56 mg/g for Cr(VI), displaying a high efficiency for removal of Cr(VI), which is much higher than pure reduced graphene oxide aerogel (rGO). In order to reveal the adsorption mechanism, the adsorption process of Cr(VI) removal was described well by pseudo-second-order adsorption kinetic, and the Langmuir adsorption isotherm(R2 = 0.994) matches the experimental data better than the Freundlich adsorption isotherm(R2 = 0.878). Additionally, the Cr(VI) adsorption mechanisms including direct adsorption process, redox reaction process and re-adsorption process have been offered by discussing X-ray photoelectron spectroscopy(XPS) before and after adsorption. Compared with high adsorption capacity with other adsorbents, the BrGA has been proved to have a promisingly widespread application in practical water purification.

KW - Adsorption

KW - Cr(VI)

KW - Graphene aerogel

KW - Lotus biochar

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DO - 10.1016/j.matchemphys.2020.123271

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SN - 0254-0584

VL - 253

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

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ER -

Synthesis of 3D lotus biochar/reduced graphene oxide aerogel as a green adsorbent for Cr(VI)

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