Synthesis of a-cellulose/magnetite/polypyrrole composite for the removal of reactive black 5 dye from aqueous solutions

Abstract

A composite was obtained from a-cellulose coated with magnetite nanoparticles and conducting polypyrrole (PPy). The magnetite nanoparticles were synthesized by the coprecipitation method from FeCl 2 and FeCl 3 salts. The composite was obtained by pyrrole polymerization in the presence of a mixture of a-cellulose and magnetite nanoparticles. The magnetite nanoparticles and composite were characterized by FTIR and UV/Vis-NIR spectroscopies, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and thermogravimetric analyses (TGA). XRD analysis demonstrated that magnetite nanoparticles with the typical cubic structures of Fe 3 O 4 were obtained. SEM analysis showed that magnetite nanoparticles had irregular morphology with average size of 13 nm, whereas the composite consisted of spherical nanoparticles of PPy coating a-cellulose fibers and magnetite nanoparticles. Batch aqueous adsorption experiments of the reactive black 5 (RB5) dye onto the synthesized material were conducted. The results showed that for the adsorption experiments set to initial pH of 3.0; the maximum adsorption capacity was 62.31 mg of dye g-1 of composite, while a value of 21.67 mg of dye g-1 of composite was obtained when the initial solution pH was set to 7.0. Adsorption isotherms for the RB5 dye were well described by the Langmuir model. The transient adsorption process of the RB5 dye onto the composite was described by a general three-resistance model; allowing the estimation of the effective diffusivity, D 0 , and the adsorption rate coefficient, k 1. For the adsorption experiments with an initial pH value set to 3.0, D 0 was estimated at 4.37 × 10-11 m 2 s-1 while k 1 was 7.30 × 10-7 L mg-1 .s.

Green Nanocellulose/PEI‐Grafted Magnetic Nanoparticles for Effective Removal of Heavy Metal Ions

“…On the other hand, desorption in HNO 3 solutions primarily occurs through ion exchange. Similar findings were reported in the desorption efficiency of CCPM (cellulose-chitosan-polypyrrole-magnetite) membranebased PCMs (full name) [52] when comparing 0.1 M HNO 3 and 0.01 M EDTA aqueous solutions for Cu 2 + and Pb 2 + ion desorption.…”

Recent advances on the removal of dyes from wastewater using various adsorbents: a critical review

“…62.31 mg/g). 282 Further, Wang et al have also used PANI/TiO 2 to remove MB dye with a maximum adsorption capacity of 458.10 mg/g, and the Langmuir adsorption isotherm is well correlated with the experimental results. The chemical adsorption, membrane diffusion, and intraparticle diffusion were the responsible adsorption processes, while H-bonding, electrostatic interaction, and coordination interaction were the responsible adsorption mechanisms (Fig.…”

Fractionation of Dye/NaCl Mixtures Using Loose Nanofiltration Membranes Based on the Incorporation of WS2 in Self-Assembled Layer-by-Layer Polymeric Electrolytes

“…As the outermost layer of the membrane, PAA is a weak polyelectrolyte with a p K a of 4.5; its ionization degree depends on the pH of the solution. RB5 is a pH-dependent azo dye with p K a values of 3.8 and 6.9 . At pH = 2, although RB5 is anionic with the highest negative charge, the carboxyl group in the PAA layer is partially deprotonated; dense RB5 cake layers are deposited on the membrane surface due to less electrostatic repulsion, and dominant sieving effect leads to minimal water flux.…”

“…RB5 is a pH-dependent azo dye with pK a values of 3.8 and 6.9. 40 At pH = 2, although RB5 is anionic with the highest negative charge, the carboxyl group in the PAA layer is partially deprotonated; dense RB5 cake layers are deposited on the membrane surface due to less electrostatic repulsion, and dominant sieving effect leads to minimal water flux. Since PAA and RB5 are fully ionized at higher pH (pH > 6.9) values, increased water flux likely results from stronger negative charge repulsion, and loose RB5 cake layers are formed on the membrane surface.…”