The adsorption of Cr(VI) from water samples using graphene oxide-magnetic (GO-Fe3O4) synthesized from natural cellulose-based graphite (kusambi wood or Schleichera oleosa): Study of kinetics, isotherms and thermodynamics

Neolaka, Yantus A.B.; Lawa, Yosep; Naat, Johnson N.; Riwu, Arsel A.P.; Iqbal, Munawar; Darmokoesoemo, Handoko; Kusuma, Heri Septya

doi:10.1016/j.jmrt.2020.04.040

Cited by 198 publications

(52 citation statements)

References 62 publications

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“…In Figure 1, the FTIR spectra can be shown, comparing the different examined materials, i.e., GO, PFSiC 1.5-15 , GO-PFSiC 1.5-15-1 , GO-PFSiC 1.5-15-0.5 , and GO-PFSiC 1.5-15-0.3 . In the FTIR spectra, primary hydroxyl C-OH (1380 cm −1 ) groups, epoxy C-O groups (1186 cm −1 ), and carbonyl C=O (1820 cm −1 ) groups can be detected in the GO spectrum, which reveals that large numbers of oxygen-containing groups have been introduced/interact into/with the GO structure [36,37]; noting also that there is an absence of absorption at the wavenumber 1725 cm −1 , which matches with the characteristics of C=C aromatic stretching vibration, indicating that GO is completely oxidized [38]. The band at 1038 cm −1 , which was found only in the spectra of pre-polymerized coagulants, can be assigned to the asymmetric Si-O stretching vibrations of Si-O-Si bonds, which is indicative of the high polymerization degree of silica.…”

Section: Characterizationmentioning

confidence: 71%

Graphene Oxide/Fe-Based Composite Pre-Polymerized Coagulants: Synthesis, Characterization, and Potential Application in Water Treatment

Tolkou

Zouboulis

2020

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This study presents for the first time the synthesis and characterization of GO (graphene oxide), PFSiC (polyferric silicate chloride), and hybrid GO-PFSiC derivatives, aiming to enhance synergistically the performance of coagulation, when applied for the treatment of water. The structure and the morphology of composite GO-PFSiC coagulants were studied in detail by the application of FTIR, XRD, and SEM characterization techniques. Furthermore, the proposed coagulants were applied for the treatment of simulated turbid surface water. The effects of the reagent’s dosage, pH value, and experimental/operational conditions on the coagulation efficiency, applied mainly for the removal of turbidity, were examined. The results, obtained from the FTIR and XRD measurements, showed the presence of a bond between the PFSiC and the GO surface, indicating that the PFSiC particles are distributed uniformly on the surface of graphene, which was also confirmed by the SEM images. Especially, the composite compound GO-PFSiC1.5-15-0.5 presents the most uniform distribution of iron on the surface of graphene oxide and exhibits the optimum coagulation efficiency, while it significantly reduces the turbidity for doses above 3–5 mg/L, i.e., achieving the respective legislation limit as proposed by WHO. Specifically, at the alkaline pH values (>7.9), the removal of turbidity reaches 96%. Consequently, the results of this study render these materials as potential coagulant agents for further research and applications, aiming to also achieve the co-removal of other water components.

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Section: Characterizationmentioning

confidence: 71%

Graphene Oxide/Fe-Based Composite Pre-Polymerized Coagulants: Synthesis, Characterization, and Potential Application in Water Treatment

Tolkou

Zouboulis

2020

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“…The functionalization of GO–PVP with Fe 3 O 4 magnetic nanoparticles has been done by chemical co-precipitation method ( Scheme 2 ). 34 In a typical procedure, 0.5 g of GO–PVP dispersed in 50 mL of DD water and sonicated for 30 min. The 100 mL solution containing 556 mg of FeSO 4 ·7H 2 O and 1081 mg of FeCl 3 ·6H 2 O salts continuously stirred at 40 °C for about 30 min and thereafter reaction mixture was adjusted to pH 4 by the addition of 1 M NaOH solution.…”

Section: Methodsmentioning

confidence: 99%

Polymer grafted magnetic graphene oxide as a potential nanocarrier for pH-responsive delivery of sparingly soluble quercetin against breast cancer cells

et al. 2022

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“…In order to further understand the adsorption mode of attapulgite to GO, the adsorption data were fitted by the Langmuir adsorption isotherm model and the Freundlich adsorption isotherm model, as shown below [ 32 ]:…”

Section: Methodsmentioning

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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The adsorption of Cr(VI) from water samples using graphene oxide-magnetic (GO-Fe3O4) synthesized from natural cellulose-based graphite (kusambi wood or Schleichera oleosa): Study of kinetics, isotherms and thermodynamics

Cited by 198 publications

References 62 publications

Graphene Oxide/Fe-Based Composite Pre-Polymerized Coagulants: Synthesis, Characterization, and Potential Application in Water Treatment

Graphene Oxide/Fe-Based Composite Pre-Polymerized Coagulants: Synthesis, Characterization, and Potential Application in Water Treatment

Polymer grafted magnetic graphene oxide as a potential nanocarrier for pH-responsive delivery of sparingly soluble quercetin against breast cancer cells

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

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