Enhancement of adsorption capacity of reduced graphene oxide by sulfonic acid functionalization: Malachite green and Zn (II) uptake

Söğüt, Eda Gökırmak; Karataş, Yaşar; Gülcan, Mehmet; Kılıç, Necla Çalışkan

doi:10.1016/j.matchemphys.2020.123662

Cited by 23 publications

(4 citation statements)

References 73 publications

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“…From the experimental results, the plots of Boyd’s equation were nonlinear and did not pass through the origin ( Figure 12 ). As a result, both models support that the rate-limiting step of the adsorption process is film diffusion [ 23 , 44 ].…”

Section: Resultsmentioning

confidence: 97%

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High-efficiency removal of cationic dye and heavy metal ions from aqueous solution using amino-functionalized graphene oxide, adsorption isotherms, kinetics studies, and mechanism

ÇELEBİ¹,

SÖĞÜT²

2022

Turkish Journal of Chemistry

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GO-NH 2 (amino functionalized graphene oxide) was synthesized by grafting (3-aminopropyl) triethoxysilane onto the surface GO (graphene oxide). The GO-NH 2 with a higher surface area and many active sites was characterized and its effectiveness in removing Rhod B dye and Ni(II) ions from wastewater by adsorption was observed. The effects of pH, time, and strange ions on the adsorption efficiency were investigated. The equilibrium isotherm data confirmed that it fits the Langmuir and Freundlich isotherm models. GO and GO-NH 2 exhibited high adsorption capacity (Q M ); 2500 (mg L −1 ) and 3333 (mg L −1 ) for Rhod B dye, and 312.5 (mg L −1 ), and 714.28 (mg L −1 ) for Ni(II) ions, respectively. The kinetics of adsorption was studied using pseudo-first-order, pseudo-second-order, intraparticle diffusion, and the Boyd model. It was found that the adsorption followed pseudo-second-order and film diffusion model are effective in this adsorption process. Adsorption mechanisms have been attributed to possible electrostatic attractions, hydrogen bonding, and interactions. In summary, the experimental results showed the synthesized GO and GO-NH 2 would be promising adsorbents to remove aqueous solutions contaminated with Rhod B dye and Ni(II) ions.

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Section: Resultsmentioning

confidence: 97%

“…In addition, the intraparticle diffusion model and Boyd model were used to evaluate the transport mechanism. Equations representing the mentioned models are presented below [ 23 ].…”

Section: Methodsmentioning

confidence: 99%

High-efficiency removal of cationic dye and heavy metal ions from aqueous solution using amino-functionalized graphene oxide, adsorption isotherms, kinetics studies, and mechanism

ÇELEBİ¹,

SÖĞÜT²

2022

Turkish Journal of Chemistry

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“…RGO has better material properties than GO (Rout et al, 2021). The transformation of GO into RGO can be carried out through a chemical reduction process (Söğüt et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Among several reducing agents that have been used have been reported such as Zn metal, Fe metal, Sn metal, NaBH4, and LiAlH4. All of these reducing agents are used to reduce GO to RGO (Söğüt et al, 2020). However, all of these reagents are classified as toxic chemicals, so the waste products from synthesis will become environmental pollution if not managed properly (Lopez et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Reduced Graphene Oxide Using Reducing Lime Juice (Citrus aurantifolia) and Its Application as Malachite Green Adsorbent in Aquatic Environments

Akbar

Hasby

2023

jppipa, pendidikan ipa, fisika, biologi, kimia

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The cytotoxicity of fishes resulting from the presence of various industrial dyes in industrial effluents is a significant global concern. This study aims to synthesize Reduced Graphene Oxide (RGO) using a natural reducing agent from lime juice. The synthesis process uses a modified Hummer method. The Langmuir and Freundlich Isothermal equations are used to study the adsorption character of MG using RGO. The adsorption kinetics was studied using first and second order equations. The adsorption capacity was measured with concentration 2, 10, 50, and 100 mg L-1 of MG respectively. The results obtained are for the adsorption isotherms following Langmuir and Freundlich. ΔG° shows a negative value which means the adsorption process is spontaneous. The adsorption kinetics follows the first order equation. The adsorption capacity obtained was Qm = 223.21 mg g−1 and a contact time of 20 minutes which made it a strong adsorbent for removing MG from water samples. The removal efficiency of MG by prepared adsorbents from real environmental water sample on the Ulee Lheue beach, Alue Naga beach, and the Krueng Aceh river has been implemented. The results obtained confirmed good work in the applicability of adsorbents for environmental

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Effect of Chemical and Thermal Treatment Priority on Physicochemical Properties and Removal of Crystal Violet Dye from Aqueous Solution

Söğüt

2022

ChemistrySelect

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The release of pollutants, especially dyes, has been a significant concern as it affects the stability of ecosystems due to poor implementation of waste protocols. In this study, the diatomite samples were characterized by pHpzc, ICP, pore size distribution, XRD, TG‐DTA, BET, SEM and FTIR (before‐after). The adsorption properties of a cationically charged dye, crystal violet (CV), on the diatomite samples were investigated by varying the adsorption parameters with the aim of evaluating the adsorption mechanism. Nonlinear Langmuir, Freundlich, Dubinin‐Radushkevich and Redlich‐Peterson isotherm models, pseudo‐first and pseudo‐second order kinetic models, intraparticle diffusion and Boyd models were evaluated. The adsorption mechanism was explained by the Langmuir isotherm model and the maximum adsorption capacities for CV (at pH 7.0) of DHCl, D800 °C+HCl and DHCl+800 °C were 5.07 mg g−1 and 4.93 mg g−1 and 65.78. mg g−1 at 298 K, respectively. It was also shown that the CV adsorption was reasonable according to the second‐order kinetic model (R2=1). Adsorption occurred via two mechanisms: hydrophobic interactions and the combination of surface hydrogen bonding between the hydroxyl groups on the diatomite surface and the nitrogen atoms of the CV. The results indicated that using DHCl+800 °C would provide a simple, energy‐saving, and cost‐effective approach to removing cationic dyes from an aqueous solution.

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Enhancement of adsorption capacity of reduced graphene oxide by sulfonic acid functionalization: Malachite green and Zn (II) uptake

Cited by 23 publications

References 73 publications

High-efficiency removal of cationic dye and heavy metal ions from aqueous solution using amino-functionalized graphene oxide, adsorption isotherms, kinetics studies, and mechanism

High-efficiency removal of cationic dye and heavy metal ions from aqueous solution using amino-functionalized graphene oxide, adsorption isotherms, kinetics studies, and mechanism

Synthesis of Reduced Graphene Oxide Using Reducing Lime Juice (Citrus aurantifolia) and Its Application as Malachite Green Adsorbent in Aquatic Environments

Effect of Chemical and Thermal Treatment Priority on Physicochemical Properties and Removal of Crystal Violet Dye from Aqueous Solution

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