Study on the Adsorption Mechanism of Graphene Oxide by Calcareous Sand in South China Sea

Lv, Beifeng; Yu, Wei; Luo, Jiale; Qian, Biao; Asefa, Mulugeta Belete; Li, Na

doi:10.1155/2021/2227570

Cited by 10 publications

(4 citation statements)

References 53 publications

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“…The results of other studies are summarized in Table 6 [ 63 , 64 , 65 ]. Due to factors such as insufficient theoretical knowledge and the limitations of experimental conditions, the study can also explore the adsorption properties of GO on different types of clay minerals.…”

Section: Discussionmentioning

confidence: 99%

Adsorption Properties and Mechanism of Attapulgite to Graphene Oxide in Aqueous Solution

Fang

Jiang

et al. 2022

IJERPH

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In order to remove toxic graphene oxide (GO) from aqueous solution, attapulgite (ATP) was used as adsorbent to recycle it by adsorption. In this paper, the effects of different pH, adsorbent mass, GO concentration, time and temperature on the adsorption of GO by attapulgite were studied, and the adsorption performance and mechanism were further explored by XRD, AFM, XPS, FTIR, TEM and SEM tests. The results show that when T = 303 K, pH = 3, and the GO concentration is 100 mg/L in 50 mL of aqueous solution, the removal rate of GO by 40 mg of attapulgite reaches 92.83%, and the partition coefficient Kd reaches 16.31. The adsorption kinetics results showed that the adsorption equilibrium was reached at 2160 min, and the adsorption process could be described by the pseudo-second-order adsorption equation, indicating that the adsorption process was accompanied by chemical adsorption and physical adsorption. The isotherm and thermodynamic parameters show that the adsorption of GO by attapulgite is more consistent with the Langmuir isotherm model, and the reaction is a spontaneous endothermic process. The analysis shows that attapulgite is a good material for removing GO, which can provide a reference for the removal of GO in an aqueous environment.

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Section: Discussionmentioning

confidence: 99%

Adsorption Properties and Mechanism of Attapulgite to Graphene Oxide in Aqueous Solution

Fang

Jiang

et al. 2022

IJERPH

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“…The graphene coating on the Au grating in this structure can make the energy more localized and prevent the metal from oxidation [ 21 – 25 ]. In addition, the dielectric constant of graphene has many similarities with metals, and when the imaginary part of the conductivity of graphene is greater than zero, the surface equipartition excitations in TM mode will be excited by the metallic nature exhibited by graphene and produce a strong field localization effect.…”

Section: Structural Modeling and Theoretical Analysismentioning

confidence: 99%

Study of Fano Resonance Effects in Graphene-Grating Composite Structures

Cui

Liu

Yang

2022

Computational Intelligence and Neuroscience

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In order to optimize the sensitivity and detection accuracy of Fano resonance optical sensors, a sensing model of graphene-grating composite micro-nanostructure with high sensing performance is proposed based on the optical properties of graphene and grating. By studying the reflection spectra and field distribution characteristics of the structure, the sensing mechanism of Fano resonance generated by the structure is elaborated, and the parameters affecting the Fano resonance sensing performance are analyzed to enhance the Fano resonance sensing performance by optimizing the structural parameters, and the Fano resonance reflection spectral curve with high-sensitivity and high-quality factor (FOM) value is obtained. The results show that when the grating period P = 300 nm, the grating height T1 = 110 nm, and the silver film thickness T2 = 30 nm, the sensitivity of the structure is 980 nm/RIU and the quality factor FOM is 770RIU−1 by changing the refractive index of the material to be measured.

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“…Based on a miscible displacement column experiment, Elbana and Selim [23] reported that the adsorption efficiency of Pb reached 99.5% withcalcareous soil. Lv et al [24] indicated that calcareous sand is a potential adsorbent for graphene oxide (GO), and the adsorption process significantly depends on pH value. Salzman et al [25] concluded that fluoride is adsorbed by calcareous and siliceous sand during drier summer months, whiledesorption occurs during rainy winter months.…”

Section: Introductionmentioning

confidence: 99%

Study on the Adsorption Characteristics of Calcareous Sand for Pb(II), Cu(II) and Cd(II) in Aqueous Solution

et al. 2023

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The adsorption characteristics of calcareous sand for heavy metals Pb(II), Cu(II) and Cd(II) have been studied by batch testing in this study. The influence of the solid–liquid ratio, initial pH0 value, ionic strength, reaction time, temperature and initial concentration on adsorption has been investigated. Test results indicate that the initial pH and the solid–liquid ratio have a significant influence on the removal efficiency. At T = 30 °C, r = 1.0 g/L, and C0 = 1000 mg/L and for 12 h of reaction, the removal efficiencies of Pb(II), Cu(II) and Cd(II) are 97.6%, 88.15% and 65.72%, respectively. The adsorption quantity is more than 80% of the maximum adsorption quantity within 60 min, and the equilibrium adsorption can be reached within 120 min. The pseudo-second-order kinetic model is suitable to simulate the dynamic adsorption process of calcareous sand, and the isothermal process is found to obey the Langmuir model. Calcareous sand has a very high adsorption capacity for Pb(II), Cu(II) and Cd(II), with a maximum adsorption quantity Qm reached 1052.95 mg/g, 1329.84 mg/g and 1050.56 mg/g, respectively. Thermodynamic test results indicate that the adsorption process is spontaneously exothermic and that low temperature is favorable to the adsorption reaction.

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Study on the Adsorption Mechanism of Graphene Oxide by Calcareous Sand in South China Sea

Cited by 10 publications

References 53 publications

Adsorption Properties and Mechanism of Attapulgite to Graphene Oxide in Aqueous Solution

Adsorption Properties and Mechanism of Attapulgite to Graphene Oxide in Aqueous Solution

Study of Fano Resonance Effects in Graphene-Grating Composite Structures

Study on the Adsorption Characteristics of Calcareous Sand for Pb(II), Cu(II) and Cd(II) in Aqueous Solution

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