Exploring Reduced Graphene Oxide Sheets Stabilized by Cu(II) and Cu(I) Cations in Ethanol

Aya Jezzini; Anne Davidson; Tayssir Hamieh; Joumana Toufaily

doi:10.3390/cryst14070654

Exploring Reduced Graphene Oxide Sheets Stabilized by Cu(II) and Cu(I) Cations in Ethanol

Aya Jezzini, Anne Davidson, Tayssir Hamieh^*, Joumana Toufaily

^*Corresponding author for this work

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

Abstract

In this study, ultrasound treatment was used to exfoliate commercially available graphite flakes into reduced graphene oxide (rGO) dispersed in ethanol. After centrifugation, solid copper chloride trihydrate was added, resulting in a green liquor containing Cu(II), Cu(I), and rGO. These liquors exhibited good and rapid photocatalytic activity in the degradation of eosin and bromophenol blue dyes (elimination in a few seconds) under visible-light irradiation. UV-visible spectroscopy confirmed the presence of rGO and Cu species. The size and morphology of the rGO sheets were investigated by several methods (SAXS, wide-angle XRD, SEM, and TEM). Negative UV peaks indicated light emission, which was independently verified by fluorescence. Intense plasmon peaks, with absorbances greater than 10, were observed after adding copper chloride salt. These plasmons were eliminated by a high dilution before the described catalytic tests were performed.

Original language	English
Article number	654
Number of pages	16
Journal	Crystals
Volume	14
Issue number	7
DOIs	https://doi.org/10.3390/cryst14070654
Publication status	Published - 1 Jul 2024

Keywords

photocatalysis
Cu2+ and Cu+
graphite
ultrasound
plasmons
dye decomposition
SPECTROSCOPY
EXFOLIATION
GRAPHITE

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title = "Exploring Reduced Graphene Oxide Sheets Stabilized by Cu(II) and Cu(I) Cations in Ethanol",

abstract = "In this study, ultrasound treatment was used to exfoliate commercially available graphite flakes into reduced graphene oxide (rGO) dispersed in ethanol. After centrifugation, solid copper chloride trihydrate was added, resulting in a green liquor containing Cu(II), Cu(I), and rGO. These liquors exhibited good and rapid photocatalytic activity in the degradation of eosin and bromophenol blue dyes (elimination in a few seconds) under visible-light irradiation. UV-visible spectroscopy confirmed the presence of rGO and Cu species. The size and morphology of the rGO sheets were investigated by several methods (SAXS, wide-angle XRD, SEM, and TEM). Negative UV peaks indicated light emission, which was independently verified by fluorescence. Intense plasmon peaks, with absorbances greater than 10, were observed after adding copper chloride salt. These plasmons were eliminated by a high dilution before the described catalytic tests were performed.",

keywords = "photocatalysis, Cu2+ and Cu+, graphite, ultrasound, plasmons, dye decomposition, SPECTROSCOPY, EXFOLIATION, GRAPHITE",

author = "Aya Jezzini and Anne Davidson and Tayssir Hamieh and Joumana Toufaily",

year = "2024",

month = jul,

day = "1",

doi = "10.3390/cryst14070654",

language = "English",

volume = "14",

journal = "Crystals",

issn = "2073-4352",

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T1 - Exploring Reduced Graphene Oxide Sheets Stabilized by Cu(II) and Cu(I) Cations in Ethanol

AU - Jezzini, Aya

AU - Davidson, Anne

AU - Hamieh, Tayssir

AU - Toufaily, Joumana

PY - 2024/7/1

Y1 - 2024/7/1

N2 - In this study, ultrasound treatment was used to exfoliate commercially available graphite flakes into reduced graphene oxide (rGO) dispersed in ethanol. After centrifugation, solid copper chloride trihydrate was added, resulting in a green liquor containing Cu(II), Cu(I), and rGO. These liquors exhibited good and rapid photocatalytic activity in the degradation of eosin and bromophenol blue dyes (elimination in a few seconds) under visible-light irradiation. UV-visible spectroscopy confirmed the presence of rGO and Cu species. The size and morphology of the rGO sheets were investigated by several methods (SAXS, wide-angle XRD, SEM, and TEM). Negative UV peaks indicated light emission, which was independently verified by fluorescence. Intense plasmon peaks, with absorbances greater than 10, were observed after adding copper chloride salt. These plasmons were eliminated by a high dilution before the described catalytic tests were performed.

AB - In this study, ultrasound treatment was used to exfoliate commercially available graphite flakes into reduced graphene oxide (rGO) dispersed in ethanol. After centrifugation, solid copper chloride trihydrate was added, resulting in a green liquor containing Cu(II), Cu(I), and rGO. These liquors exhibited good and rapid photocatalytic activity in the degradation of eosin and bromophenol blue dyes (elimination in a few seconds) under visible-light irradiation. UV-visible spectroscopy confirmed the presence of rGO and Cu species. The size and morphology of the rGO sheets were investigated by several methods (SAXS, wide-angle XRD, SEM, and TEM). Negative UV peaks indicated light emission, which was independently verified by fluorescence. Intense plasmon peaks, with absorbances greater than 10, were observed after adding copper chloride salt. These plasmons were eliminated by a high dilution before the described catalytic tests were performed.

KW - photocatalysis

KW - Cu2+ and Cu+

KW - graphite

KW - ultrasound

KW - plasmons

KW - dye decomposition

KW - SPECTROSCOPY

KW - EXFOLIATION

KW - GRAPHITE

U2 - 10.3390/cryst14070654

DO - 10.3390/cryst14070654

M3 - Article

SN - 2073-4352

VL - 14

JO - Crystals

JF - Crystals

IS - 7

M1 - 654

ER -

Exploring Reduced Graphene Oxide Sheets Stabilized by Cu(II) and Cu(I) Cations in Ethanol

Abstract

Keywords

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