Adsorption and kinetics studies of Cr (VI) by graphene oxide and reduced graphene oxide-zinc oxide nanocomposite

Taiba Naseem; Fozia Bibi; Saira Arif; Muhammad Waseem; Sirajul Haq; Mohamad Nor Azra; Taavi Liblik; Ivar Zekker

doi:10.3390/molecules27217152

Adsorption and kinetics studies of Cr (VI) by graphene oxide and reduced graphene oxide-zinc oxide nanocomposite

Taiba Naseem, Fozia Bibi, Saira Arif, Muhammad Waseem^*, Sirajul Haq^*, Mohamad Nor Azra, Taavi Liblik, Ivar Zekker

^*Corresponding author for this work

School of Engineering

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

39 Citations (Scopus)

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Abstract

In this work, graphene oxide (GO) and its reduced graphene oxide-zinc oxide nanocomposite (rGO-ZnO) was used for the removal of Cr (VI) from aqueous medium. By employing a variety of characterization techniques, morphological and structural properties of the adsorbents were determined. The adsorption study was done by varying concentration, temperature, pH, time, and amount of adsorbent. The results obtained confirmed that rGO-ZnO is a more economical and promising adsorbent for removing Cr (VI) as compared to GO. Kinetic study was also performed, which suggested that sorption of Cr (VI) follows the pseudo-first-order model. For equilibrium study, non-linear Langmuir was found a better fitted model than its linearized form. The maximum adsorption capacity calculated for GO and rGO-ZnO nanocomposite were 19.49 mg/g and 25.45 mg/g, respectively. Endothermic and spontaneous nature of adsorption was detected with positive values of ΔS (change in entropy), which reflects the structural changes happening at the liquid/solid interface.

Original language	English
Article number	7152
Pages (from-to)	1-16
Number of pages	16
Journal	Molecules
Volume	27
Issue number	21
DOIs	https://doi.org/10.3390/molecules27217152
Publication status	Published - 1 Nov 2022

Bibliographical note

Copyright the Author(s) 2022. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

adsorption
chromium VI
graphene oxide
nanocomposites

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10.3390/molecules27217152Licence: CC BY

Publisher version (open access)Final published version, 4.32 MBLicence: CC BY

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title = "Adsorption and kinetics studies of Cr (VI) by graphene oxide and reduced graphene oxide-zinc oxide nanocomposite",

abstract = "In this work, graphene oxide (GO) and its reduced graphene oxide-zinc oxide nanocomposite (rGO-ZnO) was used for the removal of Cr (VI) from aqueous medium. By employing a variety of characterization techniques, morphological and structural properties of the adsorbents were determined. The adsorption study was done by varying concentration, temperature, pH, time, and amount of adsorbent. The results obtained confirmed that rGO-ZnO is a more economical and promising adsorbent for removing Cr (VI) as compared to GO. Kinetic study was also performed, which suggested that sorption of Cr (VI) follows the pseudo-first-order model. For equilibrium study, non-linear Langmuir was found a better fitted model than its linearized form. The maximum adsorption capacity calculated for GO and rGO-ZnO nanocomposite were 19.49 mg/g and 25.45 mg/g, respectively. Endothermic and spontaneous nature of adsorption was detected with positive values of ΔS (change in entropy), which reflects the structural changes happening at the liquid/solid interface.",

keywords = "adsorption, chromium VI, graphene oxide, nanocomposites",

author = "Taiba Naseem and Fozia Bibi and Saira Arif and Muhammad Waseem and Sirajul Haq and Azra, \{Mohamad Nor\} and Taavi Liblik and Ivar Zekker",

note = "Copyright the Author(s) 2022. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2022",

month = nov,

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doi = "10.3390/molecules27217152",

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T1 - Adsorption and kinetics studies of Cr (VI) by graphene oxide and reduced graphene oxide-zinc oxide nanocomposite

AU - Naseem, Taiba

AU - Bibi, Fozia

AU - Arif, Saira

AU - Waseem, Muhammad

AU - Haq, Sirajul

AU - Azra, Mohamad Nor

AU - Liblik, Taavi

AU - Zekker, Ivar

N1 - Copyright the Author(s) 2022. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2022/11/1

Y1 - 2022/11/1

N2 - In this work, graphene oxide (GO) and its reduced graphene oxide-zinc oxide nanocomposite (rGO-ZnO) was used for the removal of Cr (VI) from aqueous medium. By employing a variety of characterization techniques, morphological and structural properties of the adsorbents were determined. The adsorption study was done by varying concentration, temperature, pH, time, and amount of adsorbent. The results obtained confirmed that rGO-ZnO is a more economical and promising adsorbent for removing Cr (VI) as compared to GO. Kinetic study was also performed, which suggested that sorption of Cr (VI) follows the pseudo-first-order model. For equilibrium study, non-linear Langmuir was found a better fitted model than its linearized form. The maximum adsorption capacity calculated for GO and rGO-ZnO nanocomposite were 19.49 mg/g and 25.45 mg/g, respectively. Endothermic and spontaneous nature of adsorption was detected with positive values of ΔS (change in entropy), which reflects the structural changes happening at the liquid/solid interface.

AB - In this work, graphene oxide (GO) and its reduced graphene oxide-zinc oxide nanocomposite (rGO-ZnO) was used for the removal of Cr (VI) from aqueous medium. By employing a variety of characterization techniques, morphological and structural properties of the adsorbents were determined. The adsorption study was done by varying concentration, temperature, pH, time, and amount of adsorbent. The results obtained confirmed that rGO-ZnO is a more economical and promising adsorbent for removing Cr (VI) as compared to GO. Kinetic study was also performed, which suggested that sorption of Cr (VI) follows the pseudo-first-order model. For equilibrium study, non-linear Langmuir was found a better fitted model than its linearized form. The maximum adsorption capacity calculated for GO and rGO-ZnO nanocomposite were 19.49 mg/g and 25.45 mg/g, respectively. Endothermic and spontaneous nature of adsorption was detected with positive values of ΔS (change in entropy), which reflects the structural changes happening at the liquid/solid interface.

KW - adsorption

KW - chromium VI

KW - graphene oxide

KW - nanocomposites

UR - https://www.scopus.com/pages/publications/85141583438

U2 - 10.3390/molecules27217152

DO - 10.3390/molecules27217152

M3 - Article

C2 - 36363976

AN - SCOPUS:85141583438

SN - 1420-3049

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SP - 1

EP - 16

JO - Molecules

JF - Molecules

IS - 21

M1 - 7152

ER -

Adsorption and kinetics studies of Cr (VI) by graphene oxide and reduced graphene oxide-zinc oxide nanocomposite

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