Synthesized multi-walled carbon nanotubes as a potential adsorbent for the removal of methylene blue dye: kinetics, isotherms, and thermodynamics

Selen, Veyis; Güler, Ömer; Özer, Dursun; Evi̇n, Ertan

doi:10.1080/19443994.2015.1025851

Cited by 49 publications

(10 citation statements)

References 49 publications

(64 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides that, no peaks related to Pd or Au were found, indicating either the small size of the Pd and Au particles or their X-ray amorphous structure. Diffraction lines belonging to the support (2θ = 25.7, 44.3, 54, 78) correspond to graphite with a hexagonal lattice, in agreement with the literature data [36,37].…”

Section: Catalyst Characterizationsupporting

confidence: 90%

Oxidation of 5-Hydroxymethylfurfural on Supported Ag, Au, Pd and Bimetallic Pd-Au Catalysts: Effect of the Support

et al. 2021

View full text Add to dashboard Cite

Oxidation of 5-hydroxymethylfurfural (HMF), a major feedstock derived from waste/fresh biomass, into 2,5-furandicarboxylic acid (FDCA) is an important transformation for the production of biodegradable plastics. Herein, we investigated the effect of the support (unmodified and modified titania, commercial alumina, and untreated and treated Sibunit carbon) of mono- and bimetallic catalysts based on noble metals (Ag, Au, Pd) on selective HMF oxidation with molecular oxygen to FDCA under mild and basic reaction conditions. The higher selectivity to FDCA was obtained when metals were supported on Sibunit carbon (Cp). The order of noble metal in terms of catalyst selectivity was: Ag < Au < Pd < PdAu. Finally, FDCA production on the most efficient PdAu NPs catalysts supported on Sibunit depended on the treatment applied to this carbon support in the order: PdAu/Cp < PdAu/Cp-HNO3 < PdAu/Cp-NH4OH. These bimetallic catalysts were characterized by nitrogen adsorption-desorption, inductively coupled plasma atomic emission spectroscopy, high resolution transmission electron microscopy, energy dispersive spectroscopy, X-ray diffraction, Hammet indicator method and X-ray photoelectron spectroscopy. The functionalization of Sibunit surface by HNO3 and NH4OH led to a change in the contribution of the active states of Pd and Au due to promotion effect of N-doping and, as a consequence, to higher FDCA production. HMF oxidation catalyzed by bimetallic catalysts is a structure sensitive reaction.

show abstract

Section: Catalyst Characterizationsupporting

confidence: 90%

Oxidation of 5-Hydroxymethylfurfural on Supported Ag, Au, Pd and Bimetallic Pd-Au Catalysts: Effect of the Support

et al. 2021

View full text Add to dashboard Cite

show abstract

“…High costs and the limited capacities of various technologies, e.g., advanced oxidation and photodegradation, also put restrictions on their applications. Adsorption is a feasible treatment for dye pollution with high efficiency, low cost, and easy operation. , The adsorption of dyes onto different adsorbents has already been studied, − while the interactions between different dyes and their adsorption behaviors on adsorbents have barely been investigated, because most studies have been performed in single dye systems. , However, real water pollution tends to contain more than one type of dyes and shows various adsorption mechanisms and behaviors, which can influence the adsorption capacities and equilibrium time.…”

Section: Introductionmentioning

confidence: 99%

A Novel One-Pot Route for Large-Scale Synthesis of Novel Magnetic CNTs/Fe@C Hybrids and Their Applications for Binary Dye Removal

2018

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Novel magnetic CNTs/Fe@C was prepared via an easy and one-pot method with a high specific surface area (186.3 m2/g) and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectra, etc., and it was used for dye removal. Adsorption experiments showed significant differences between single and binary dye systems. The initial adsorption capacities to methylene blue (MB), methyl orange (MO), and neutral red (NR) were 132.58, 16.53, and 98.81 mg/g, and the adsorption equilibrium time was 80, 40, and 10 min, respectively. The MB-MO dye system showed a cooperative adsorption. Its adsorption capacities increased by 30% and 35%, and equilibrium time decreased by 25% and 50%, whereas the MB-NR system presented a competitive adsorption. Its adsorption capacities decreased by 20% and 33%, and its equilibrium time was elongated 2-fold. Various isotherms and kinetic models were used to fit the data and investigate the adsorption processes as well as mechanisms. Interactions between dyes in the solution and their adsorption mechanisms onto CNTs/Fe@C were also studied through Fourier transform infrared (FT-IR), Raman spectra, and zeta potential. This study indicated that CNTs/Fe@C can be used as a promising adsorbent for large-scale applications, and cooperative and competitive adsorption in binary dye systems has an influence upon the adsorption process, which can help address dye pollution efficiently.

show abstract

“…The XRD pattern displayed in SM2a exhibit various diffraction peaks accounting for the crystalline hexagonal structure of carbon as referenced in (JCPDS 26-1076)[35,36]. The intense (006) peak located at 26° suggests dominant exposure of these planes in the sample[37,38]. Interestingly, the main peak (006) as shown in SM2(a-d) is present in all XRD patterns of CNTs and CNT-Dye nanohybrids which indicate that the hexagonal structure of carbon nanomaterial is maintained after covalent surface modification with dyes.…”

mentioning

confidence: 98%

“Painted CNT”@Au nanoparticles: a nanohybrid electrocatalyst of direct methanol oxidation

et al. 2021

View full text Add to dashboard Cite

In a world of constant rush towards novel energy sources, hybrid nanomaterials have raised huge interest as their components can synergistically improve the expected performances in terms of power. In this regard, direct methanol oxidation (DMO) is among the most investigated reactions for implementation in portable and other devices. Herein, we report the design of gold-decorated CNT-aryl nanohybrids as electrocatalyst of DMO. In a first step, Azure A (AA), Neutral Red (NR) and Congo Red (CR) dye diazonium salts were reacted with CNTs to provide CNT-Dye nanoscale platforms for the immobilization of gold NPs. This step was conducted with CNT-Dye platforms evenly spread over glassy carbon (GC) electrodes. The CNT-Dye@Au nanohybrid electrode materials served for DMO electrocatalysis. Cyclic voltammograms show that bare CNT-Dye nanohybrids exhibit high electrocatalytic activity, particularly for the CNT-CR nanohybrid which returned a 3-fold improvement. With anchored Au NPs, a further 4 time remarkable increase in the oxidation peak intensity was achieved (i.e. about 12-fold the peak intensity recorded in the absence of any nanocatalyst). The forward to the backward anodic peak current density ratio J f /J b was found to be as high as is 1.68.This work provides a simple, elegant and efficient approach for designing robust, nanohybrid electrocatalyst for DMO, based on the smart combination of CNTs, diazotized dyes and gold NPs.

show abstract

Synthesized multi-walled carbon nanotubes as a potential adsorbent for the removal of methylene blue dye: kinetics, isotherms, and thermodynamics

Cited by 49 publications

References 49 publications

Oxidation of 5-Hydroxymethylfurfural on Supported Ag, Au, Pd and Bimetallic Pd-Au Catalysts: Effect of the Support

Oxidation of 5-Hydroxymethylfurfural on Supported Ag, Au, Pd and Bimetallic Pd-Au Catalysts: Effect of the Support

A Novel One-Pot Route for Large-Scale Synthesis of Novel Magnetic CNTs/Fe@C Hybrids and Their Applications for Binary Dye Removal

“Painted CNT”@Au nanoparticles: a nanohybrid electrocatalyst of direct methanol oxidation

Contact Info

Product

Resources

About