Carbon nanotubes modified with 5,7-dinitro-8-quinolinol as potentially applicable tool for efficient removal of industrial wastewater pollutants

Salam, E. T. A.; El-Nour, Kholoud M. Abou; Awad, Awatif; Orabi, Adel S.

doi:10.1016/j.arabjc.2017.02.005

Cited by 27 publications

(1 citation statement)

References 33 publications

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“…In this study, the effect of the ionic strength on the adsorption of n‐MWCNTs was examined. Genarally, it can create different adsorption situations by which electrostatic interactions between the MWCNTs surface and positive ions are either attractive or repulsive [38] . The adsorption of MB on n‐MWCNTs decreased dramatically as the concentration of NaCl increased, as displayed in Figure 7.…”

Section: Resultsmentioning

confidence: 99%

Application of Nitric Acid Modified Multi‐Walled Carbon Nanotubes for Efficient Removal of Methylene Blue in Aqueous Solution

2022

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In this work, multi‐walled carbon nanotubes (MWCNTs) was modified with nitric acid and applied as efficient adsorbents for the removal of methylene blue (MB) in aqueous solution. The morphologies of the modified MWCNTs were characterized by N2 adsorption‐desorption (BET), transmission electron microscope (TEM) and X‐ray photoelectron spectroscopy (XPS). Batch experiments were conducted systematically to explore the effects of various parameters including mass dosage of adsorbents, initial concentration of MB dye, pH of solution and ionic strength about the adsorption performance with modified MWCNTs. The adsorption for MB pollutants achieves the highest efficiency of 95.18 % occurring at about pH 11 when the adsorbent dosage is at 1.0 g L−1, the initial dye concentration is at 50 mg L−1 and the concentration of NaCl is 0 M. And the Langmuir, Freundlich and Temkin equilibrium isotherms were researched. The results revealed both the Freundlich and Langmuir isotherms fitted well to experimental data suggesting adsorption of MB onto MWCNTs as a result of a monolayer formation. In addition, the adsorption behavior of MB dye followed the pseudo second‐order kinetics indicating there was a synergistic effect in the adsorption process based on the factors of mass transfer resistance in the particles, the external liquid membrane diffusion, surface adsorption and internal diffusion of the particles.

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Section: Resultsmentioning

confidence: 99%