Kinetic and isotherm studies on adsorption of methylene blue using polyacrylonitrile/hydroxyl group functionalized multiwall carbon nanotube multilayered nanofibrous composite

Abstract

Nanofibrous composite mat was prepared using polyacrylonitrile hard yarn waste and hydroxyl group functionalized multiwall carbon nanotubes (MWCNTs-OH) by electrospinning technique and exploit for methylene blue dye adsorption from aqueous solution. The nanofibrous composite mat was characterized by Fourier transform (FT) infrared spectroscopy, FT-Raman, scanning electron microscopy, X-ray diffractometer and thermogravimetric analyser. The adsorption experiments were studied to investigate the effect of MWCNT-OH weight percentage, initial solution pH, contact time and initial dye concentration on the adsorption. The higher percentage of methylene blue adsorption was found to be 80.05% under optimal condition. The adsorption equilibrium data were studied with Langmuir and Freundlich isotherm models. The R2 value was found to be higher in the Freundlich isotherm model which was clearly indicated that the Freundlich isotherm model is most suitable for the adsorption of methylene blue on nanofibrous composite mat. The kinetic study was carried out to explain the adsorption rate of methylene blue on nanofibrous composite. The kinetic study of methylene blue adsorption was favourable to the pseudo second-order equation.

Adsorption of lead ions from wastewater using electrospun zeolite/MWCNT nanofibers: kinetics, thermodynamics and modeling study

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“… 20 The sharp peak at 2244 cm −1 appears due to the stretching of the nitrile group (C N), evidenced by the existence of PAN in adsorbents. 42,48 …”

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“…The underlying principles are predicated on several assumptions: the adsorbent possesses a homogeneous structure, the adsorbed molecules or atoms are restricted to particular locations, each location can accommodate only one molecule or atom, the adsorption energy remains consistent across all locations, and there is no interaction between adjacent adsorbates [49]. On the other hand, the Freundlich model characterizes systems with different components and reversible adsorption without imposing limitations on the adsorption of a single layer [50]. Figures 6 and Table 1 display the linear representations of experimental data using the Langmuir and Freundlich models, respectively.…”

Efficient selective methylene blue adsorption by polyurethane/montmorillonite‐based antifouling electrospun composite membranes

“…2 Because of the adverse effect of dyes on water, their removal and purification are a global challenge. [3][4][5][6][7] Hence, the development of effective methods and materials for dye removal from wastewater is highly needed.…”

“…The most severe risk of industrial dyes is their resistance to degradation in natural environments and their adverse impact on the aquatic ecosystem 2 . Because of the adverse effect of dyes on water, their removal and purification are a global challenge 3–7 . Hence, the development of effective methods and materials for dye removal from wastewater is highly needed.…”