Adsorption of methyl orange by synthesized and functionalized-CNTs with 3-aminopropyltriethoxysilane loaded TiO2 nanocomposites

A novel mesoporous carbon nanostructured material was prepared and characterized by scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, thermogravimetry, and X-ray diffractometry. The material demonstrated high-speed and high-adsorption capacities of 827.5 and 2484.5 mg g–1 for methyl orange (MO) and malachite green (MG) dyes in 10 min. The kinetic data were fitted to pseudo-first- and pseudo-second-order, external and intraparticle diffusion, and Elovich models, whereas the isotherm data were adjusted to the Langmuir, Freundlich, Temkin, Dubinin–Radushkevich, and Langmuir–Freundlich isotherms (Sips). It was found that MO and MG adsorption was limited by chemical interactions and mixed diffusion. Besides, the physical process was elucidated through free energy values (E = 2.56 and 0.049 kJ mol–1 for the MO and MG, respectively). Methyl orange adsorption mostly occurred through ion exchange and electrostatic interactions, and at lower MO concentrations, through chemical interactions and surface complexation as well. Malachite green adsorption took place only on lower-energy sites. Thus, it can be concluded that the adsorbent proposed herein possessed high-speed and high-adsorption capacity. Therefore, it can be considered as promising in removing the reported dye pollutants.

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“…If the solution pH is higher than the adsorbent pH PZC , the adsorption capacity depends on the difference between these values. 32,33…”

Section: Resultsmentioning

confidence: 99%

High-Speed and High-Capacity Removal of Methyl Orange and Malachite Green in Water Using Newly Developed Mesoporous Carbon: Kinetic and Isotherm Studies

et al. 2019

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“…Such cases have been commonly reported in the adsorption of aromatics ,. The mechanism of the π, π ‐ π and π ‐ π EDA interactions is metaphorized in Figure and the Table lists some CNT based nanocomposites for removal of organics.…”

Section: Insight On Sorption Mechanismsmentioning

confidence: 90%

Engineered Carbon Nanotubes: Review on the Role of Surface Chemistry, Mechanistic Features, and Toxicology in the Adsorptive Removal of Aquatic Pollutants.

et al. 2018

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The advent of nanotechnology has led to the development of new nanomaterials with enriched material properties over the conventional. These nanomaterials find wide application in numerous fields including environmental predominantly on water purification. Carbon nanotubes (CNT) are one among the nanomaterials widely employed for such application. Therefore, the present review emphasizes on the exceptional abilities of CNT especially in the removal of organics and inorganics from aquatic streams. Though numerous reviews were published in this subject most of them focused on the synthesis and specific applications. The authors learned that there is a wider gap on the review that presents the mechanistic features like the development of active sites, the effect of curvature, inclusion of heteroatoms, methods for the enhancement of affinity and selectivity through functionalization, the introduction of defects and the chemistry involved in their interaction with various category of pollutants. Hence, the present review delivers a clear understanding of the above-said factors in a comprehensive way. The article explicits on the various surface modification techniques (i.e covalent, non-covalent, defect and endohedral) along with their effects on the sorption efficiency. Further, the review also provides a clear picture of the toxicological aspects of the CNT. The authors strongly believe that the present review will aid in the understanding and design of multifunctional CNT towards environmental application in a comprehensive manner.

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“…35,36 Whereas, the latter interaction links the nitrogen and oxygen atoms of the MO (H-acceptor) with the accessible hydrogen atoms of the An and An/CNT hydroxyl and carboxyl groups (H-donor). 35,36,39 The involvement of Hbonding mechanism was affirmed by the noticeable sorption efficiency of MO by An and An/CNT at pH 8.0-10.0 (21.56 to 30.59% and 30.8 to 43.7%, respectively) regardless of the OH À presence as a competing ions in the solution.…”

Section: Effect Of Solution Phmentioning

confidence: 93%

Carbon nanotube impregnated anthracite (An/CNT) as a superior sorbent for azo dye removal

Mohamed

Zayed

2020

RSC Adv.

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Adsorption of methyl orange by synthesized and functionalized-CNTs with 3-aminopropyltriethoxysilane loaded TiO2 nanocomposites

Cited by 122 publications

References 79 publications

High-Speed and High-Capacity Removal of Methyl Orange and Malachite Green in Water Using Newly Developed Mesoporous Carbon: Kinetic and Isotherm Studies

High-Speed and High-Capacity Removal of Methyl Orange and Malachite Green in Water Using Newly Developed Mesoporous Carbon: Kinetic and Isotherm Studies

Engineered Carbon Nanotubes: Review on the Role of Surface Chemistry, Mechanistic Features, and Toxicology in the Adsorptive Removal of Aquatic Pollutants.

Carbon nanotube impregnated anthracite (An/CNT) as a superior sorbent for azo dye removal

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