Adsorptive removal of diclofenac by graphene oxide: Optimization, equilibrium, kinetic and thermodynamic studies

Hiew, Billie Yan Zhang; Lee, Lai Yee; Lee, Xin Jiat; Gan, Suyin; Thangalazhy‐Gopakumar, Suchithra; Lim, Siew Shee; Pan, Guan‐Ting; Yang, Thomas C.-K.

doi:10.1016/j.jtice.2018.07.034

Cited by 71 publications

(25 citation statements)

References 57 publications

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“…The zeta potential of CMCAB is shown in Figure 5. Based on Figure 5, the zeta potential of CMCAB was positive in pH (3) to (5) it is in line with finding of Liu et al [16] and Zhang et al [33]. Zeta potentials (mV) were 19, 16 and 1 in pH (3), pH (4) and pH (5), respectively.…”

Section: Resultssupporting

confidence: 88%

“…In terms of the BET technique, the specific surface area and pore size distribution of CMCAB with the specific surface area and pore size distribution analyzers were determined under the conditions of liquid nitrogen temperature. The zeta potential of the CMCAB was analyzed by the zeta potential meter (Zetasizer nano-ZS90, Malvern Panalytical Ltd, Malvern, UK) at 25 • C in different pH (3)(4)(5)(6)(7)(8)(9).…”

Section: Producing Cross-linked Magnetic Chitosan/activated Biochar (Cmcab)mentioning

confidence: 99%

“…Among the different non-steroidal anti-inflammatory drugs, diclofenac is widely applied. Diclofenac (Figure 1; 2-((2,6-dichlorophenyl)amino)phenylacetic-acid) has been stated to cause chronic results such as renal and gastrointestinal tissue damage in some vertebrates [5]. Ibuprofen (Figure 1; 2-(4-Isobutylphenyl)propionic acid) is applied for the treatment of pain and inflammation and dropping of a fever [6].…”

Section: Introductionmentioning

confidence: 99%

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Cross-Linked Magnetic Chitosan/Activated Biochar for Removal of Emerging Micropollutants from Water: Optimization by the Artificial Neural Network

Mojiri

Kazeroon

Gholami

2019

Water

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One of the most important types of emerging micropollutants is the pharmaceutical micropollutant. Pharmaceutical micropollutants are usually identified in several environmental compartments, so the removal of pharmaceutical micropollutants is a global concern. This study aimed to remove diclofenac (DCF), ibuprofen (IBP), and naproxen (NPX) from the aqueous solution via cross-linked magnetic chitosan/activated biochar (CMCAB). Two independent factors—pH (4–8) and a concentration of emerging micropollutants (0.5–3 mg/L)—were monitored in this study. Adsorbent dosage (g/L) and adsorption time (h) were fixed at 1.6 and 1.5, respectively, based on the results of preliminary experiments. At a pH of 6.0 and an initial micropollutant (MP) concentration of 2.5 mg/L, 2.41 mg/L (96.4%) of DCF, 2.47 mg/L (98.8%) of IBP, and 2.38 mg/L (95.2%) of NPX were removed. Optimization was done by an artificial neural network (ANN), which proved to be reasonable at optimizing emerging micropollutant elimination by CMCAB as indicated by the high R2 values and reasonable mean square errors (MSE). Adsorption isotherm studies indicated that both Langmuir and Freundlich isotherms were able to explain micropollutant adsorption by CMCAB. Finally, desorption tests proved that cross-linked magnetic chitosan/activated biochar might be employed for at least eight adsorption-desorption cycles.

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Section: Resultssupporting

confidence: 88%

Section: Producing Cross-linked Magnetic Chitosan/activated Biochar (Cmcab)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cross-Linked Magnetic Chitosan/Activated Biochar for Removal of Emerging Micropollutants from Water: Optimization by the Artificial Neural Network

Mojiri

Kazeroon

Gholami

2019

Water

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“…Its tendency to dissolve in water with high polarity and less degradability makes it accumulate in water, hence resulting in water pollution 4 . Therefore, DCF is a worth removing substance from our water environments 5 . Conventional treatment methods such as activated sludge treatment, chlorination, sedimentation, microbial degradation, membrane bioreactors and granular activated carbon may not be suitable treatments for removal of drugs which are non-biodegradable and toxic in nature, thus, a need for advance treatment process like advance oxidation by photocatalysis to eliminate such pollutants completely from wastewater treatment plants 6 .…”

Section: Introductionmentioning

confidence: 99%

A facile synthesis of bismuth oxychloride-graphene oxide composite for visible light photocatalysis of aqueous diclofenac sodium

Rashid

Karim

Kumar

et al. 2020

Sci Rep

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In this study, bismuth oxychloride/graphene oxide (BiOCl-GO) composite was fabricated by facile one pot hydrothermal method. The pure BiOCl and BiOCl-GO composite was characterized by X-ray diffraction, Transmission electron microscopy X-ray photoelectron spectroscopy and UV–Vis diffuse reflectance spectroscopy. The synthesized composite was then assessed for photocatalytic degradation of diclofenac sodium (DCF) in visible as well as direct solar light and UV irradiation. Results indicated that the photocatalytic removal efficiency of DCF was significantly affected by dose of catalysts, pH value and source of light. The results reveled that degradation efficiency of BiOCl-GO for DCF reduced from 100 to 34.4% with the increases in DCF initial concentration from 5 mg L −1 to 25 mg L −1 . The solar light degradation of DCF using BiOCl-GO was achieved with apparent rate constant 0.0037 min −1 . The effect of scavengers study revealed that superoxide ions and holes were mainly responsible for DCF degradation. The regeneration study indicates that BiOCl-GO composite can be successfully recycled up to the five cycles. The study revealed the effectiveness of one pot hydrothermal method for the fabrication of BiOCl-GO composite.

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“…However, decreasing the ∆H° at higher MG concentrations (100 mg L −1 ) indicates a decrease in the interactions between the meso-CaAl 2 O 4 and the MG dye, which can be due to the quick saturation of active sites on the exterior surface of meso-CaAl 2 O 4 at higher concentrations and prevents the accessing of more dye molecules to more unoccupied active sites. The values of ∆S° (181.55, 183.6, and 39.05 J mol –1 ,) are also positive, which suggests the increment of randomness at the interface of the meso-CaAl 2 O 4 /solution during the process of MG dye adsorption 74 . This degree of randomness has decreased with decreases the mobility of molecules at higher MG concentrations (100 mg L −1 ).…”

Section: Resultsmentioning

confidence: 88%

A reusable mesoporous adsorbent for efficient treatment of hazardous triphenylmethane dye wastewater: RSM-CCD optimization and rapid microwave-assisted regeneration

Arabkhani

Javadian

Asfaram

et al. 2021

Sci Rep

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In this research, mesoporous calcium aluminate nanostructures (meso-CaAl2O4) were synthesized using a citric acid-assisted sol–gel auto-combustion process as the potential adsorbent to eliminate toxic triphenylmethane dye malachite green (MG) from synthetic/real effluent. The surface morphology of meso-CaAl2O4 was highly porous with nanometric size and non-homogeneous surface. The specific surface area, total pore volume, and BJH pore diameter of meso-CaAl2O4 were 148.5 m2 g−1, 1.39 cm3 g−1, and 19 nm, respectively. The meso-CaAl2O4 also showed a very high heat resistance, due to losing only 7.95% of its weight up to 800 °C, which is mainly related to the moisture loss. The optimal adsorption conditions were obtained based on response surface methods (RSM)-central composite design (CCD) techniques. The Langmuir isotherm model was used for fitting the adsorption measurements, which presented 587.5 mg g–1 as the maximum adsorption capacity of the dye. The data obtained from the adsorption kinetics model were found to correspond to the pseudo-second-order model. Also, the thermodynamic parameters including enthalpy change (ΔH°), entropy change (ΔS°), and Gibbs free energy change (ΔG°) indicated that MG dye adsorption by the meso-CaAl2O4 was feasible, endothermic, and occurred spontaneously. Furthermore, the meso-CaAl2O4 was regenerated by microwave irradiation under 900 W at 6 min, and the MG dye removal efficiency was remained over 90% after the five cycles of microwave regeneration.

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Adsorptive removal of diclofenac by graphene oxide: Optimization, equilibrium, kinetic and thermodynamic studies

Cited by 71 publications

References 57 publications

Cross-Linked Magnetic Chitosan/Activated Biochar for Removal of Emerging Micropollutants from Water: Optimization by the Artificial Neural Network

Cross-Linked Magnetic Chitosan/Activated Biochar for Removal of Emerging Micropollutants from Water: Optimization by the Artificial Neural Network

A facile synthesis of bismuth oxychloride-graphene oxide composite for visible light photocatalysis of aqueous diclofenac sodium

A reusable mesoporous adsorbent for efficient treatment of hazardous triphenylmethane dye wastewater: RSM-CCD optimization and rapid microwave-assisted regeneration

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