Removal of an anionic reactive dye from aqueous solution using functionalized multi-walled carbon nanotubes: isotherm and kinetic studies

Abstract

2015): Removal of an anionic reactive dye from aqueous solution using functionalized multi-walled carbon nanotubes: isotherm and kinetic studies, Desalination and Water Treatment, A B S T R A C TIn this research, the adsorption process of Reactive Blue 19 (RB19) as an anionic dye onto functionalized multi-walled carbon nanotubes (f-MWCNTs) was studied. For this purpose, four parameters including agitation time, adsorbent dose, initial dye concentration, and pH were examined. N 2 adsorption isotherms and Fourier transform infrared spectroscopy were used to characterize f-MWCNTs. Four isotherm and four kinetic models including two diffusion models were applied to comprehensively investigate the RB19 adsorption using f-MWCNTs. It was found that the adsorption follows Langmuir and Temkin equilibrium models with a maximum adsorption capacity of 217.39 mg g −1 . The adsorption process best fitted to pseudo-second-order kinetic model and by applying diffusion models, the predominant rate-limiting step was found to be physisorption during the liquid film diffusion.

Novel Fe3O4/hydroxyapatite/β‐cyclodextrin nanocomposite adsorbent: Synthesis and application in heavy metal removal from aqueous solution

“…Nanomaterials have gained considerable interest among researchers due to their widespread use in various applications in chemistry, biology, medical, and material science . A prominent use of these materials is in the field of environmental remediation as nano‐adsorbents owing to their high surface to volume ratio, high reactivity, and negligible internal diffusion resistance . Nanomagnetic adsorbents are the preferred choice due to their superior characteristics among other nanomaterials.…”

An Integrative Approach to Study Bacterial Enzymatic Degradation of Toxic Dyes

“…Various nanostructured carbons such as carbon nanotube, graphene, and graphite are investigated mainly to remove toxic stains as an adsorbent. Graphene oxide (Mao et al, 2020), graphene (Liu et al, 2016;Elsagh et al, 2017), and functionalized MWCNT (Karimifard and Alavi, 2016) have been studied for reactive dye removal.…”

In-Situ SERS Detection of Hg2+/Cd2+ and Congo Red Adsorption Using Spiral CNTs/Brass Nails

“…Several experimental studies on the adsorption of heavy metal ions on single- and multi-wall CNTs have already been conducted [ 10 , 12 , 13 ]. Carbon nanotubes (CNTs) are a typical adsorbent used to extract organic and other inorganic pollutants from wastewater [ 14 , 15 , 16 ]. CNTs are used as adsorbents more frequently than conventional adsorbents due to their superior volume-area ratios, functional surfaces, strong electrostatic interactions, cylindrical hollow structures, high mechanical strengths, and quicker equilibrium durations [ 17 , 18 , 19 ].…”

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