Cited by 189Adsorption and biosorption for pollutant removalPharmaceutical and Antibiotic Environmental ImpactsEnvironmental remediation with nanomaterials

Adsorptive decontamination of diclofenac by three-dimensional graphene-based adsorbent: Response surface methodology, adsorption equilibrium, kinetic and thermodynamic studies

Hiew, Billie Yan Zhang, Lee, Lai Yee, Lai, Kar Chiew, Gan, Suyin, Thangalazhy-Gopakumar, Suchithra, Pan, Guan-Ting, Yang, Thomas Chung-Kuang·2019·Environmental Research

Abstract

Pharmaceutical residues are emerging pollutants in the aquatic environment and their removal by conventional wastewater treatment methods has proven to be ineffective. This research aimed to develop a three-dimensional reduced graphene oxide aerogel (rGOA) for the removal of diclofenac in aqueous solution. The preparation of rGOA involved facile self-assembly of graphene oxide under a reductive environment of L-ascorbic acid. Characterisation of rGOA was performed by Fourier transform infrared, scanning electron microscope, transmission electron microscopy, nitrogen adsorption-desorption, Raman spectroscopy and X-ray diffraction. The developed rGOA had a measured density of 20.39 ± 5.28 mg/cm 3, specific surface area of 132.19 m 2/g, cumulative pore volume of 0.5388 cm 3/g and point of zero charge of 6.3. A study on the simultaneous interactions of independent factors by response surface methodology suggested dosage and initial concentration as the dominant parameters influencing the adsorption of diclofenac. The highest diclofenac adsorption capacity (596.71 mg/g) was achieved at the optimum conditions of 0.25 g/L dosage, 325 mg/L initial concentration, 200 rpm shaking speed and 30 °C temperature. The adsorption equilibrium data were best fitted to the Freundlich model with correlation coefficient (R 2) varying from 0.9500 to 0.9802. The adsorption kinetic data were best correlated to the pseudo-first-order model with R 2 ranging from 0.8467 to 0.9621. Thermodynamic analysis showed that the process was spontaneous (∆G = - 7.19 to - 0.48 kJ/mol) and exothermic (∆H = - 12.82 to - 2.17 kJ/mol). This research concluded that rGOA is a very promising adsorbent for the remediation of water polluted by diclofenac.

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Crossref · 10.1016/j.envres.2018.09.030

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Authors
Hiew, B. Y. Z., Lee, L. Y., Lai, K. C., Gan, S., Thangalazhy-Gopakumar, S., Pan, G.-T., & Yang, T. C.-K.
Affiliations
  • University of Nottingham Malaysia Campus (MY)
  • National Taipei University of Technology (TW)
Corresponding author
Lee, Lai Yee
Venue
Environmental Research
Publisher
Elsevier BV
Published
2019-01
Volume
168
Pages
241-253
ISSN
0013-9351 (ISSN-L)
OpenAlex
W2893771673
Cited by
189
References
76
Citations by year
2026: 13 · 2025: 17 · 2024: 21 · 2023: 24 · 2022: 22 · 2021: 36 · 2020: 31 · 2019: 21 · 2018: 3
FWCI
9.97
Type
journal article
Language
en
Open access
closed
Locations
  • Environmental Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
Ministry of Higher Education (FRGS/1/2015/SG06/UNIM/02/1)
Topics
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
  • Physical Sciences › Environmental Science › Pollution › Pharmaceutical and Antibiotic Environmental Impacts
  • Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
Keywords
diclofenac, adsorption, reduced graphene oxide aerogel, pharmaceutical pollutants, wastewater treatment, ascorbic acid reduction, adsorption kinetics, adsorption isotherms, adsorption thermodynamics, Freundlich isotherm, pseudo-first-order kinetics, water remediation
MeSH terms
Adsorption, Decontamination, Diclofenac, Graphite, Hydrogen-Ion Concentration, Kinetics, Thermodynamics, Water Pollutants, Chemical, Spectroscopy, Fourier Transform Infrared

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