Adsorption Studies of Cationic, Anionic and Azo-Dyes via Monodispersed Fe₃O₄ Nanoparticles

Abstract

The present paper reports the applicability of magnetite (Fe3O4) nanoparticles as an adsorbent for the removal of three dyes viz. Acridine orange (cationic dye), Comassie Brilliant Blue R-250 (anionic dye) and Congo red (azo dye) from their aqueous solution. The Fe3O4 nanoparticles were synthesized via simple chemical precipitation method using CTAB, as surfactant. The as-prepared nanoparticles were characterized in terms of their morphological, structural and optical properties by using transmission electron microscopy X-ray diffraction and UV-visible spectroscopic measurements. The dye removal efficiency of Fe3O4 NPs have been determined by investigating several factors such as effect of pH, amount of adsorbent dose and effect of contact time on different dye concentrations. Langmuir and Freundlich adsorption isotherms have also been studied to explain the interaction of dyes. The experimental data indicate that the adsorption rate follows pseudo- second-order kinetics for the removal of all the three dyes. Moreover, the nanoparticles and the adsorbed dyes were desorbed. The identities of recovered nanoparticles as well as the three dyes have been found, as same and were reused.

Preparation of NiFe2O4/polythiophene nanocomposite and its enhanced adsorptive uptake of Janus green B and Fuchsin basic from aqueous solution: Isotherm and kinetics studies

“…Similar trends of the effect of pH on adsorption of dyes have been reported by other researchers . The results depict that maximum removal efficiency of the composite for JG and FB are around pH zpc , which confirms that weak van der Waals forces are dominant for the adsorption process . The most plausible mechanism involving π ‐ π , van der Waals and electrostatic interactions can be proposed for dyes adsorption onto NiFe 2 O 4 /Pth composite.…”

Inorganic engineered nanoparticles in drinking water treatment: a critical review

“…422 The rate, mechanism and efficiency of dechlorination was further investigated in refs 423 and 424 whereas the effect of ZVI nanoparticles presence in biological degradation of trichloroethylene was also evaluated. In brief, Fe 3 O 4 nanoparticles conjugated with carboxymethyl-β-cyclodextrin, 447 coated by CTAB, 448 humic acid, 449 polymers 450 or chitosan 451 and combined with carbon 452,453 were able to adsorb a variety of representative dyes. 426 In addition, bimetallic Fe-Pd nanoparticles were examined under batch laboratory experiments targeting to clarify the effect of sorption, surfactants and dissolved organic matter in the degradation of soil-sorbed trichloroethylene 427 or in field assessment for chlorinated aliphatic hydrocarbons.…”

The UV/Fenton Degradation of Tetrabromobisphenol A Catalyzed by Nanocrystalline Chromium Substituted Magnetite

“…During the last decade, growing interest has been evoked in the application of iron oxides in industry and environmental processes, [1][2][3][4][5][6] especially for the transition metal substituted magnetites as catalysts with nano-size. [7][8][9][10][11][12][13][14] One of the most promising applications should be as heterogeneous Fenton catalysts in the degradation of organic pollutants, e.g., dyes, phenol and hydroquinone, [15][16][17][18] due to the merits of easy handling, low cost, nontoxicity and environmental harmony.…”