Adsorption kinetics of methylene blue dyes onto magnetic graphene oxide

Othman, Nur Hidayati; Alias, Nur Hashimah; Shahruddin, Munawar Zaman; Bakar, Noor Fitrah Abu; Him, Nik Raikhan Nik; Lau, Woei Jye

doi:10.1016/j.jece.2018.04.024

Cited by 210 publications

(86 citation statements)

References 32 publications

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“…A very narrow and sharp peak which indicates the highly crystallinity and ordered structure material was observed for graphite. After the oxidation of graphite into GO, the distinctive peak of graphite at 2 θ = 27.5°, resultant from (002) reflection, completely vanished and a new peak at a lower 2 θ (10.18°) was observed which is consistent with previous reported data . The interlayer spacing of graphite and GO can be determined from the XRD results and it is known that the interlayer spacing is relative to the oxidation degree of the material .…”

Section: Resultssupporting

confidence: 90%

“…After the oxidation of graphite into GO, the distinctive peak of graphite at 2⊔ = 27.5°, resultant from (002) reflection, completely vanished and a new peak at a lower 2⊔ (10.18°) was observed which is consistent with previous reported data. [33][34][35] The interlayer spacing of graphite and GO can be determined from the XRD results and it is known that the interlayer spacing is relative to the oxidation degree of the material. 36 In this work, the d-spacing was found to increase from 0.324 nm to 0.868 nm after the oxidation and exfoliation processes.…”

Section: Resultsmentioning

confidence: 99%

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Fabrication and characterization of graphene oxide–polyethersulfone (GO–PES) composite flat sheet and hollow fiber membranes for oil–water separation

Junaidi

Othman

Shahruddin

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND In this work, a series of graphene oxide–polyethersulfone (GO–PES) composite flat sheet (FS) and hollow fiber (HF) membranes were fabricated by blending 0.5 and 1.0 wt% of GO into the PES matrix and utilized for oil–water separation. GO was first prepared and characterized by using Fourier‐transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), X‐ray diffraction (XRD) and thermogravimetric analysis (TGA) before being used as membrane fillers. RESULTS Interestingly, although similar dope composition was used for the fabrication of HF and FS membranes, their morphology and pore size varied significantly owing to the way the membranes were fabricated. Significant enhancement of hydrophilicity was observed for both composite FS and HF membranes, where the water contact angle value decreased from 74.8° to 42.2° and 71.4° to 49.8°, respectively. The flux of the composite membranes increased up to 150% of the bare membranes especially when 1.0 wt% of GO was added. Although higher oil rejection (~99%) was observed for HF membranes that possess smaller pores, the permeation flux was maintained due to the improved flow dynamic. Lower oil rejection (up to 50%) was observed for FS membranes, which might be due to its big pore sizes particularly at the bottom surface. As more oil droplets formed on the membrane surface and prevented water molecules to pass through the membrane, fouling might occur rapidly. CONCLUSIONS The results obtained in this work suggest that surface hydrophilicity, pore size of membranes and oil–water separation performances was greatly affected by membrane shape. Owing to many advantages of HF membranes, this type of membrane has great potential for commercial applications. © 2020 Society of Chemical Industry

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Fabrication and characterization of graphene oxide–polyethersulfone (GO–PES) composite flat sheet and hollow fiber membranes for oil–water separation

Junaidi

Othman

Shahruddin

et al. 2020

J of Chemical Tech & Biotech

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“…The values reported for Q m in the literature are in a wide range. While Othman et al [ 65 ] suggested 1666.67 mg/g for the removal of MB dye, Tharaneedhar et al [ 60 ] reported 82.71 mg/g and Gourbanpour et al [ 18 ] obtained 810.4 mg/g for their developed composite. For SF dye removal, Abukhadra et al [ 66 ] and Sahu et al [ 67 ] reported 65.35 and 89.47 mg/g, respectively.…”

Section: Modelingmentioning

confidence: 99%

Polyvinyl Alcohol/Calcium Carbonate Nanocomposites as Efficient and Cost-Effective Cationic Dye Adsorbents

et al. 2020

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A novel polyvinyl alcohol (PVA)/calcium carbonate-based double-layer cationic dye adsorbent was developed. Polyvinyl alcohol (50 wt %) and calcium carbonate (50 wt %) were used together with borax as a cross-linking agent. The nanocomposite was prepared using only water, without the need for any toxic solvent or hazardous chemical. The final samples were obtained by the solvent casting method. The nanocomposite adsorbent was characterized using a Fourier transform infrared (FTIR) spectroscope and a scanning electron microscope (SEM). The adsorption performance on two cationic dyes, i.e., methylene blue and safranin was studied. Dye adsorption was quantified by measuring the nanocomposite swelling, contact time, and dye concentration. Pseudo first-order and pseudo second-order kinetic models as well as intraparticle diffusion model were used to model the adsorption kinetics. Moreover, the isotherm dye adsorption was investigated by Langmuir and Freundlich models. The results revealed that the developed nanocomposite has relatively high adsorption efficiency and short adsorption time and retains its performance after several successive absorption–desorption processes. The results also showed that the pseudo-second-order model best describes the adsorption kinetics, and the Freundlich isotherm model has a better compatibility with the experimental data. Finally, an adsorption mechanism was proposed for the dye removal process. The developed PVA/CaCO3 nanocomposite can be potentially used for efficient dye removal in wastewater treatments.

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“…Othman et al produced magnetic graphene oxide which had 99.6% efficiency for the remediation of methylene blue from an aqueous medium [ 125 ]. The regeneration study was done using 1M acetic acid.…”

Section: Literature Reviewmentioning

confidence: 99%

Multifunctional Magnetic Oxide Nanoparticle (MNP) Core-Shell: Review of Synthesis, Structural Studies and Application for Wastewater Treatment

Nnadozie

Ajibade

2020

Molecules

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The demand for water is predicted to increase significantly over the coming decades; thus, there is a need to develop an inclusive wastewater decontaminator for the effective management and conservation of water. Magnetic oxide nanocomposites have great potentials as global and novel remediators for wastewater treatment, with robust environmental and economic gains. Environment-responsive nanocomposites would offer wide flexibility to harvest and utilize massive untapped natural energy sources to drive a green economy in tandem with the United Nations Sustainable Development Goals. Recent attempts to engineer smart magnetic oxide nanocomposites for wastewater treatment has been reported by several researchers. However, the magnetic properties of superparamagnetic nanocomposite materials and their adsorption properties nexus as fundamental to the design of recyclable nanomaterials are desirable for industrial application. The potentials of facile magnetic recovery, ease of functionalization, reusability, solar responsiveness, biocompatibility and ergonomic design promote the application of magnetic oxide nanocomposites in wastewater treatment. The review makes a holistic attempt to explore magnetic oxide nanocomposites for wastewater treatment; futuristic smart magnetic oxides as an elixir to global water scarcity is expounded. Desirable adsorption parameters and properties of magnetic oxides nanocomposites are explored while considering their fate in biological and environmental media.

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Adsorption kinetics of methylene blue dyes onto magnetic graphene oxide

Cited by 210 publications

References 32 publications

Fabrication and characterization of graphene oxide–polyethersulfone (GO–PES) composite flat sheet and hollow fiber membranes for oil–water separation

Fabrication and characterization of graphene oxide–polyethersulfone (GO–PES) composite flat sheet and hollow fiber membranes for oil–water separation

Polyvinyl Alcohol/Calcium Carbonate Nanocomposites as Efficient and Cost-Effective Cationic Dye Adsorbents

Multifunctional Magnetic Oxide Nanoparticle (MNP) Core-Shell: Review of Synthesis, Structural Studies and Application for Wastewater Treatment

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