Isotherm and Kinetic Modeling of Strontium Adsorption on Graphene Oxide

Abu-Nada, Abdulrahman; Abdala, Ahmed; McKay, Gordon

doi:10.3390/nano11112780

Cited by 23 publications

(14 citation statements)

References 35 publications

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“…Figure 3 demonstrates the FTIR spectra of the GO for the wavelength range of 450–4000 cm −1 . The main characteristic peaks of the GO group were in good agreement with what was previously reported [ 36 – 39 ]. The carbonyl, alkoxy, and epoxy functional groups were confirmed by the FTIR peaks at 1703 cm −1 , 1055 cm −1 , and 1229 cm −1 , respectively.…”

Section: Resultssupporting

confidence: 92%

The antimicrobial efficacy of graphene oxide, double antibiotic paste, and their combination against Enterococcus faecalis in the root canal treatment

et al. 2023

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Background Inter-appointment medication of the root canals with appropriate intracanal medicaments has been advocated to improve root canal disinfection. Graphene oxide (GO) has shown promising antimicrobial activity against a wide range of microorganisms, besides the capability of carrying antibiotics. The current study aimed to compare the antibacterial activity of double antibiotic paste (DAP) and GO per se and in combination (GO-DAP) against Enterococcus faecalis (E. faecalis). Methods A total of 108 extracted human mandibular premolars were contaminated with three-week-old E. faecalis and subjected to a primary microbial assessment. The samples were categorized into 15 groups concerning the intracanal medicament (DAP, GO, GO-DAP, and control) and contact time (1, 7, and 14 days). Then, the root canals were medicated, incubated, and resubjected to a secondary antimicrobial evaluation. The colony-forming units (CFU) were counted to calculate the antimicrobial efficacy. The data were analyzed via the Kruskal–Wallis test (α = 0.05). Results GO-DAP was the only medicament that completely eradicated E. faecalis in 1 day. The percentage reduction of CFU/ml in the GO-DAP and DAP groups was higher than that in the GO group at all allocated contact times. Furthermore, a significant decrease of the CFU/ml was seen in the GO and DAP groups after 7 and 14 days of being medicated (P < 0.05). Conclusion Since GO-DAP improved root canal disinfection, this novel material can be introduced as a promising intracanal medicament against E. faecalis even in the short run.

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Section: Resultssupporting

confidence: 92%

The antimicrobial efficacy of graphene oxide, double antibiotic paste, and their combination against Enterococcus faecalis in the root canal treatment

et al. 2023

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“…Similarly, granular manganese oxide shows relatively good sorption capacity, very weak affinity, and long equilibrium time [ 73 ]. The sorption properties of SA*PEI, based on the compromise between sorption capacity and affinity, kinetics, and pH, are comparable to those reported for amidoximated algal/PEI beads [ 38 ], functionalized silica beads [ 74 ], functionalized graphene oxide [ 75 ], and graphene oxide [ 76 ]. Compared with a commercial ion-exchanger (i.e., sulfonated Dowex 50W-X8 resin) that also bears sulfonic groups, the sorption capacity, determined at lower pH (i.e., 3.7), is of the same order (as well as the equilibrium time) while the affinity coefficient is significantly higher (up to 206 L mmol −1 ).…”

Section: Resultssupporting

confidence: 67%

New Process for the Sulfonation of Algal/PEI Biosorbent for Enhancing Sr(II) Removal from Aqueous Solutions—Application to Seawater

Hamza

Guibal²,

Althumayri

et al. 2022

Molecules

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Sulfonic resins are highly efficient cation exchangers widely used for metal removal from aqueous solutions. Herein, a new sulfonation process is designed for the sulfonation of algal/PEI composite (A*PEI, by reaction with 2-propylene-1-sulfonic acid and hydroxylamine-O-sulfonic acid). The new sulfonated functionalized sorbent (SA*PEI) is successfully tested in batch systems for strontium recovery first in synthetic solutions before investigating with multi-component solutions and final validation with seawater samples. The chemical modification of A*PEI triples the sorption capacity for Sr(II) at pH 4 with a removal rate of up to 7% and 58% for A*PEI and SA*PEI, respectively (with SD: 0.67 g L−1). FTIR shows the strong contribution of sulfonate groups for the functionalized sorbent (in addition to amine and carboxylic groups from the support). The sorption is endothermic (increase in sorption with temperature). The sulfonation improves thermal stability and slightly enhances textural properties. This may explain the fast kinetics (which are controlled by the pseudo-first-order rate equation). The sulfonated sorbent shows a remarkable preference for Sr(II) over competitor mono-, di-, and tri-valent metal cations. Sorption properties are weakly influenced by the excess of NaCl; this can explain the outstanding sorption properties in the treatment of seawater samples. In addition, the sulfonated sorbent shows excellent stability at recycling (for at least 5 cycles), with a loss in capacity of around 2.2%. These preliminary results show the remarkable efficiency of the sorbent for Sr(II) removal from complex solutions (this could open perspectives for the treatment of contaminated seawater samples).

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“…However, compared with initial adsorption, the Raman spectra of GOA after adsorption obtained a lower intensity of peak G, and there have slightly moved. That can be explained by the interaction between oxygen functional groups of GOA and PN, or BPA [70] …”

Section: Resultsmentioning

confidence: 99%

Optimization of Conditions for Removal Phenolic Compounds from Water by a Graphene Oxide Aerogel

Hieu

Hương

et al. 2022

ChemistrySelect

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In this study, graphene oxide (GO) was prepared from graphite by improved Hummers’ method. Graphene oxide aerogel (GOA) was synthesized via the ice segregation induced self‐assembly method. Various modern analytical methods were utilized to characterize GOA. The results revealed the aerogel structure with a pore size of 100–150 μm, a specific surface area of 515.21 m2/g, and a pore volume of 2.08–2.16 cm3/g. The synthesized GOA was applied as an adsorbent for the removal of phenol (PN) and bisphenol A (BPA) with a maximum adsorption capacity of 117.65 and 70.17 mg/g, respectively. Response surface methodology involving a rotating central composite design was applied to investigate simultaneously the effects of adsorption variables including adsorption time, pH, and initial concentration on the removal efficiency of GOA for PN or BPA. The results showed that the optimal adsorption efficiency for PN was 92.15 % with an adsorption time of 208.52 min, a pH of 6.08, and an initial PN concentration of 30 mg/L. Regarding BPA, the optimal adsorption efficiency was 95.27 % with an adsorption time of 352.79 min, a pH of 4.91, and an initial BPA concentration of 20 mg/L. The adsorption of both PN and BPA onto GOA was appropriate with the Langmuir model, in which the maximum adsorption capacity of GOA for PN and BPA was 117.65 and 70.175 mg/g, respectively. The results confirmed that the adsorption of PN and BPA onto GOA was monolayer adsorption on a homogeneous surface. The adsorption mechanism of GOA for PN or BPA depended mainly on the electrostatic interaction and hydrogen bonding between −OH of PN, BPA, and oxygen‐containing functional groups of GOA. Besides, π‐π interaction between carbon rings of GOA and PN or BPA also contributed to the enhancement of adsorption performance. The results showed that GOA exhibited potential application in the treatment of organic pollutants. Besides, the evaluation of the morphology of the GOA and the simultaneous effects of different factors can contribute to the advancement of graphene‐based materials and the improvement of wastewater treatment.

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Isotherm and Kinetic Modeling of Strontium Adsorption on Graphene Oxide

Cited by 23 publications

References 35 publications

The antimicrobial efficacy of graphene oxide, double antibiotic paste, and their combination against Enterococcus faecalis in the root canal treatment

The antimicrobial efficacy of graphene oxide, double antibiotic paste, and their combination against Enterococcus faecalis in the root canal treatment

New Process for the Sulfonation of Algal/PEI Biosorbent for Enhancing Sr(II) Removal from Aqueous Solutions—Application to Seawater

Optimization of Conditions for Removal Phenolic Compounds from Water by a Graphene Oxide Aerogel

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