Green synthesis of graphene-oxide based nanocomposites for efficient removal of methylene blue dye from wastewater

Obayomi, Kehinde Shola; Lau, Sie Yon; Danquah, Michael K.; Zhang, Jianhua; Chiong, Tung; Meunier, Louise; Gray, Stephen; Rahman, Mohammad Mahmudur

doi:10.1016/j.desal.2023.116749

Cited by 26 publications

(3 citation statements)

References 74 publications

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“…The accumulation of dye can take place through either physisorption or chemisorption, depending on the nature of the mutual interaction between the particle surface and the adsorbate. In numerous instances, dye uptake on nanocomposite materials is facilitated by electrostatic interaction, hydrogen bonding, and pore filling [ 62 ]. CR is an anionic dye that incorporates a sulfonic group in its structure.…”

Section: Resultsmentioning

confidence: 99%

Process Optimization and Equilibrium, Thermodynamic, and Kinetic Modeling of Toxic Congo Red Dye Adsorption from Aqueous Solutions Using a Copper Ferrite Nanocomposite Adsorbent

Parimelazhagan,

Chinta,

Shetty

et al. 2024

Molecules

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In the present investigation of copper ferrite, a CuFe2O4 nanocomposite adsorbent was synthesized using the sol–gel method, and its relevance in the adsorptive elimination of the toxic Congo red (CR) aqueous phase was examined. A variety of structural methods were used to analyze the CuFe2O4 nanocomposite; the as-synthesized nanocomposite had agglomerated clusters with a porous, irregular, rough surface that could be seen using FE-SEM, and it also contained carbon (23.47%), oxygen (44.31%), copper (10.21%), and iron (22.01%) in its elemental composition by weight. Experiments were designed to achieve the most optimized system through the utilization of a central composite design (CCD). The highest uptake of CR dye at equilibrium occurred when the initial pH value was 5.5, the adsorbate concentration was 125 mg/L, and the adsorbent dosage was 3.5 g/L. Kinetic studies were conducted, and they showed that the adsorption process followed a pseudo-second-order (PSO) model (regression coefficient, R2 = 0.9998), suggesting a chemisorption mechanism, and the overall reaction rate was governed by both the film and pore diffusion of adsorbate molecules. The process through which dye molecules were taken up onto the particle surface revealed interactions involving electrostatic forces, hydrogen bonding, and pore filling. According to isotherm studies, the equilibrium data exhibited strong agreement with the Langmuir model (R2 = 0.9989), demonstrating a maximum monolayer adsorption capacity (qmax) of 64.72 mg/g at pH 6 and 302 K. Considering the obtained negative ΔG and positive ΔHads and ΔSads values across all tested temperatures in the thermodynamic investigations, it was confirmed that the adsorption process was characterized as endothermic, spontaneous, and feasible, with an increased level of randomness. The CuFe2O4 adsorbent developed in this study is anticipated to find extensive application in effluent treatment, owing to its excellent reusability and remarkable capability to effectively remove CR in comparison to other adsorbents.

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Section: Resultsmentioning

confidence: 99%

Process Optimization and Equilibrium, Thermodynamic, and Kinetic Modeling of Toxic Congo Red Dye Adsorption from Aqueous Solutions Using a Copper Ferrite Nanocomposite Adsorbent

Parimelazhagan,

Chinta,

Shetty

et al. 2024

Molecules

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“…Figure a shows that graphene oxide (GO) exhibits a sharp characteristic peak (0 0 1) at 2θ = 11.31° with an interlayer spacing of 0.78 nm, as calculated using the Bragg equation. , This spacing is larger than the interlayer spacing of graphite (0.34 nm), attributed to the insertion of numerous oxygen-containing functional groups, which effectively expand the interlayer spacing of the graphene sheets. In the diffraction pattern of the dopamine-modified graphene aerogel (DGA), the characteristic peak of graphene oxide disappears, and a new peak appears at 2θ = 26.5°, matching the diffraction peak of the natural graphite (0 0 2) crystal plane and indicating effective reduction and restoration of the conjugated structure under the combined influence of dopamine and hydrothermal conditions .…”

Section: Resultsmentioning

confidence: 99%

rGO/ZIF-8 Aerogel for Effective Removal of Malachite Green from Wastewater

Li,

Liu,

Gao

et al. 2024

Langmuir

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In this study, dopamine-modified graphene aerogel (DGA) is synthesized through a one-step hydrothermal method using graphene oxide as the precursor and dopamine as the reducing agent. Subsequently, in situ immersion synthesis is conducted to obtain ZIF-8 loaded on a dopamine-modified graphene aerogel skeleton (ZDGA), featuring a regular honeycomb interconnected mesoporosity and a high specific surface area of 532.8 m2/g. The synthesized ZDGA exhibited exceptional adsorption performance for the cationic dye malachite green. At room temperature, ZDGA achieved an impressive equilibrium adsorption capacity of 6578.34 mg/g. The adsorption process followed pseudo-secondary kinetics and adhered to the Langmuir model, indicating chemically dominated adsorption on a monomolecular layer. Intraparticle diffusion was the primary rate determinant, with π–π stacking, electrostatic adsorption, hydrogen bonding, and Lewis acid–base interactions serving as the key driving forces. It has an ideal specific surface area and good cycling performance, which highlights its potential application in dye wastewater treatment.

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“…Among them, carbon nanotubes and graphene oxide (GO) showed effective acid polar gas species adsorption capacity (H 2 S, NO x , SO 2 , etc.) and ultrafine dust removal [45][46][47]. However, the separation efficiency is greatly affected by surface functionalization, which can enhance the capture efficiency of ca.…”

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confidence: 99%

Nanoscale Solutions: The Transformative Applications of Functionalized Nanomaterials in Environmental Remediation

Cerra,

Fratoddi

2024

Applied Nano

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Green synthesis of graphene-oxide based nanocomposites for efficient removal of methylene blue dye from wastewater

Cited by 26 publications

References 74 publications

Process Optimization and Equilibrium, Thermodynamic, and Kinetic Modeling of Toxic Congo Red Dye Adsorption from Aqueous Solutions Using a Copper Ferrite Nanocomposite Adsorbent

Process Optimization and Equilibrium, Thermodynamic, and Kinetic Modeling of Toxic Congo Red Dye Adsorption from Aqueous Solutions Using a Copper Ferrite Nanocomposite Adsorbent

rGO/ZIF-8 Aerogel for Effective Removal of Malachite Green from Wastewater

Nanoscale Solutions: The Transformative Applications of Functionalized Nanomaterials in Environmental Remediation

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