Unravelling the distinct surface interactions of modified graphene nanostructures with methylene blue dye through experimental and computational approaches

Manappadan, Zinoy; Kumar, Shubham; Joshi, Krati; Govindaraja, Thillai; Krishnamurty, Saïlaja; Selvaraj, Kaliaperumal

doi:10.1016/j.jhazmat.2019.121755

Cited by 13 publications

(6 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The XRD pattern of HG exhibited the typical sharp peak positioned at 2θ∼26.6°; in contrast, the OGNs displayed a broad peak at 2θ∼26.0°, which corresponds to (002) diffraction plane of graphite [22]. The calculated interlayer spacing of OGNs and HG are 0.342 and 0.334 nm, respectively, demonstrating the effective expansion of the graphite layer [17,35]. The XRD results suggested that the oxygen-containing functional groups have been successfully introduced to the graphite layer.…”

Section: Resultsmentioning

confidence: 96%

“…Methylene blue is a cationic dye, while OGNs contain numerous anion groups, like COO − and OH -. Hence, the oxygen-containing groups on graphene nanosheets critically adsorb the MB, which promoted the interaction between MB and OGNs [17]. The FTIR analysis was conducted to unveil the potential reason for the aboveproposed mechanism (figure 5(c)).…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the performance of various modified graphene nanostructures has been systematically investigated through surface interaction with methylene blue. The experimental and computational results revealed that the electrostatic interaction factor played an important role in enhancing the MB adsorption performance [17]. To date, the use of hybrid nanocomposite GO-based adsorbents has emerged as a promising approach to enhance pollutants removal such as magnetic modified-GO/zeolite [11], GO/agricultural waste [12], γ-Fe 2 O 3 -macro/mesoporous graphene [14], and GO/ metal-organic frameworks [15].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Gram-scale synthesis of electrochemically oxygenated graphene nanosheets for removal of methylene blue from aqueous solution

Hao¹,

Minh²,

Hong³

et al. 2021

Nanotechnology

View full text Add to dashboard Cite

In this study, oxygenated graphene nanosheets (OGNs) were successfully synthesized using a simple electrochemical exfoliation approach and applied to remove methylene blue (MB) in an aqueous solution. The surface morphology and structure of the OGNs were characterized by scanning electron microscopy, transmission electron microscopy, Raman, and x-ray photoelectron spectroscopy. The adsorption performance of OGNs towards aqueous MB was tested by batch experiments. Results showed that a large number of functional groups in OGNs enhanced the removal of MB from the aqueous solution due to the electrostatic interactions between the electrochemically oxygenated groups (e.g. C–OH, C–O, and C=O) and dye molecules. Using Langmuir adsorption isotherm, the maximum MB adsorption capacity (q max) was determined as high as 476.19 mg g−1. These results suggested that the as-prepared OGNs is an effective and promising adsorbent for removing MB, which could be studied extensively for color removal in wastewater treatment.

show abstract

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gram-scale synthesis of electrochemically oxygenated graphene nanosheets for removal of methylene blue from aqueous solution

Hao¹,

Minh²,

Hong³

et al. 2021

Nanotechnology

View full text Add to dashboard Cite

show abstract

“…In fact, the removal efficiency only slightly decreased from 99.46 to 97.83 % when the pH varied from 10 to 2.5. This suggested that the adsorption of methylene blue onto the graphite powder was also governed by other interactions (e.g., π-π interaction) [42,43], which overcome the electrostatic repulsion that occurs in acidic medium. Thus, loose graphite powder is a promising adsorbent over a wide range of pH of water resources.…”

Section: Effect Of Medium Phmentioning

confidence: 99%

Loose and Encased Graphite for Methylene Blue Adsorption: Process Optimization and Principal Component Analysis

Mah,

Azhar,

Wong

et al. 2023

Chem Eng & Technol

View full text Add to dashboard Cite

Graphite is often converted to expanded graphite or graphene for water remediation. However, these processes require extra chemicals and energy. This study tested loose and encased pristine graphite powders for dye removal. The loose graphite exhibited good methylene blue removal (>97 % across pH levels), indicating that π‐π interaction is the governing factor besides electrostatic attraction. Notably, 5 g of loose graphite led to 100 % removal. Langmuir isotherm fitting disclosed a maximum adsorption capacity of 4.7059 mg g−1. Principal component analysis showed that dye concentration and adsorbent dosage had a greater impact than pH and contact time. However, encasing graphite in a tea bag inhibits adsorption; future studies could explore options facilitating adsorbate penetration into tea bags.

show abstract

“…Beyond the visual impact, many dyes that are released into the water are toxic, carcinogenic, or mutagenic to living organisms, primarily due to the presence of aromatic compounds such as benzidine and naphthalene [ 4 ]. Methylene blue (MB), a widely used dye in the textile industry, has been classified as a high-risk compound due to its high toxicity and persistence in the environment [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Analysis of Hydroxyl and Epoxy Group Effects on Graphene Oxide Properties

Jaramillo-Fierro,

Cuenca

2024

Nanomaterials

View full text Add to dashboard Cite

In this study, we analyzed the impact of hydroxyl and epoxy groups on the properties of graphene oxide (GO) for the adsorption of methylene blue (MB) dye from water, addressing the urgent need for effective water purification methods due to industrial pollution. Employing a dual approach, we integrated experimental techniques with theoretical modeling via density functional theory (DFT) to examine the atomic structure of GO and its adsorption capabilities. The methodology encompasses a series of experiments to evaluate the performance of GO in MB dye adsorption under different conditions, including differences in pH, dye concentration, reaction temperature, and contact time, providing a comprehensive view of its effectiveness. Theoretical DFT calculations provide insights into how hydroxyl and epoxy modifications alter the electronic properties of GO, improving adsorption efficiency. The results demonstrate a significant improvement in the dye adsorption capacity of GO, attributed to the interaction between the functional groups and MB molecules. This study not only confirms the potential of GO as a superior adsorbent for water treatment, but also contributes to the optimization of GO-based materials for environmental remediation, highlighting the synergy between experimental observations and theoretical predictions in advances in materials science to improve sustainability.

show abstract

Unravelling the distinct surface interactions of modified graphene nanostructures with methylene blue dye through experimental and computational approaches

Cited by 13 publications

References 47 publications

Gram-scale synthesis of electrochemically oxygenated graphene nanosheets for removal of methylene blue from aqueous solution

Gram-scale synthesis of electrochemically oxygenated graphene nanosheets for removal of methylene blue from aqueous solution

Loose and Encased Graphite for Methylene Blue Adsorption: Process Optimization and Principal Component Analysis

Theoretical and Experimental Analysis of Hydroxyl and Epoxy Group Effects on Graphene Oxide Properties

Contact Info

Product

Resources

About