TY - JOUR
T1 - Adsorptive removal of diclofenac by graphene oxide
T2 - Optimization, equilibrium, kinetic and thermodynamic studies
AU - Hiew, Billie Yan Zhang
AU - Lee, Lai Yee
AU - Lee, Xin Jiat
AU - Gan, Suyin
AU - Thangalazhy-Gopakumar, Suchithra
AU - Lim, Siew Shee
AU - Pan, Guan Ting
AU - Yang, Thomas Chung Kuang
N1 - Funding Information:
This research was financially supported by the Ministry of Higher Education (MOHE), Malaysia under the Fundamental Research Grant Scheme (FRGS/1/2015/SG06/UNIM/02/1).
Funding Information:
This research was financially supported by the Ministry of Higher Education (MOHE), Malaysia under the Fundamental Research Grant Scheme (FRGS/1/2015/SG06/UNIM/02/1).
Publisher Copyright:
© 2018 Taiwan Institute of Chemical Engineers
PY - 2019/5
Y1 - 2019/5
N2 - Diclofenac is a pharmaceutical compound which is listed as a priority substance to be removed from wastewater. The current research investigated the adsorption of diclofenac using graphene oxide (GO) which was characterized by Fourier transform infrared, scanning electron microscopy, X-ray diffraction, transmission electron microscopy and Raman spectroscopy. Response surface methodology was employed to optimize the adsorption of diclofenac onto GO based on central-composite design. According to the developed model, the dominant parameters affecting the process were dosage and initial concentration. The optimum adsorption conditions were dosage of 0.16 g/L, time of 14.75 min, initial concentration of 400 mg/L and temperature of 40 °C. Under these conditions, GO exhibited a maximum adsorption capacity of 653.91 mg/g for diclofenac. The diclofenac uptake by GO was consistent with the Langmuir adsorption and pseudo-second-order kinetic models. The active binding sites for diclofenac in GO might be hydroxyl, carboxyl and alkoxy as determined by FTIR analysis. The results provided sufficient evidence to support GO as a promising adsorbent for removal of diclofenac in aqueous solution.
AB - Diclofenac is a pharmaceutical compound which is listed as a priority substance to be removed from wastewater. The current research investigated the adsorption of diclofenac using graphene oxide (GO) which was characterized by Fourier transform infrared, scanning electron microscopy, X-ray diffraction, transmission electron microscopy and Raman spectroscopy. Response surface methodology was employed to optimize the adsorption of diclofenac onto GO based on central-composite design. According to the developed model, the dominant parameters affecting the process were dosage and initial concentration. The optimum adsorption conditions were dosage of 0.16 g/L, time of 14.75 min, initial concentration of 400 mg/L and temperature of 40 °C. Under these conditions, GO exhibited a maximum adsorption capacity of 653.91 mg/g for diclofenac. The diclofenac uptake by GO was consistent with the Langmuir adsorption and pseudo-second-order kinetic models. The active binding sites for diclofenac in GO might be hydroxyl, carboxyl and alkoxy as determined by FTIR analysis. The results provided sufficient evidence to support GO as a promising adsorbent for removal of diclofenac in aqueous solution.
KW - Adsorption
KW - Diclofenac
KW - Equilibrium
KW - Graphene oxide
KW - Kinetic
KW - Response surface methodology
UR - http://www.scopus.com/inward/record.url?scp=85051623028&partnerID=8YFLogxK
U2 - 10.1016/j.jtice.2018.07.034
DO - 10.1016/j.jtice.2018.07.034
M3 - Article
AN - SCOPUS:85051623028
SN - 1876-1070
VL - 98
SP - 150
EP - 162
JO - Journal of the Taiwan Institute of Chemical Engineers
JF - Journal of the Taiwan Institute of Chemical Engineers
ER -