Adsorption of Alizarin, Eriochrome Blue Black R, and Fluorescein Using Different Iron Oxides as Adsorbents

Abstract

This work presents kinetic and thermodynamic analysis of the adsorption of three dyes: alizarin, eriochrome blue black R, and fluorescein onto goethite, Co-goethite, and magnetite of medium Brunauer-Emmett-Teller surface area. The adsorption of the dyes on the oxides is fast. Fluorescein exhibits the lowest level adsorption for all adsorbents with goethite being the most efficient adsorbent when milligrams of dye per gram of oxide are considered. The Langmuir isotherm is the most appropriate for describing the adsorption data for the following systems: alizarin-magnetite and eriochrome and fluorescein with the three adsorbents, while alizarin-goethite and alizarin-Co-goethite show better fits with Freundlich isotherm. Molecular modeling using MM2 was used to analyze the steric effects on adsorption.

Elimination of dyes from aqueous solutions using iron oxides and chitosan as adsorbents: a comparative study

“…14 In a previous work we have investigated the efficiency of three iron oxides (goethite, Co-goethite and magnetite) to remove synthetic dyes (Alizarin, Eriochrome Blue Black R and Fluorescein) from aqueous solutions as a function of initial dye concentration and the contact time on adsorption process. 15 The objective of this work is to compare the results the adsorption of two iron oxides with those using a biopolymer (chitosan). These dyes were chosen because of their structures, which are commonly present in dyes of the textile industry.…”

The contribution of vanadium and titanium on improving methylene blue decolorization through heterogeneous UV-Fenton reaction catalyzed by their co-doped magnetite

“…After 3-4 washings, the particles were collected and freeze dried at −50 • C in vacuum for 12 h. Ti doped magnetite as reference sample was synthesized according to the above procedure without adding NH 4 VO 3 and V doped magnetite as reference sample was synthesized without adding TiCl 4 . And Fe 3 O 4 also as reference sample was prepared without adding these two chemicals [18,19]. All the magnetite samples were ground and passed through a 200 mesh screen.…”

The influence of substituting metals (Ti, V, Cr, Mn, Co and Ni) on the thermal stability of magnetite

“…Magnetite samples were synthesized by a precipitation-oxidation routine [21,22] The contents of Fe, Ti, V, Cr, Co, Mn, and Ni in the synthetic samples were measured spectrophotometrically by the phenanthroline [23], diantipyrylmethane [24], tungstovanadophosphoric acid [25], 1, 5 diphenylcarbohydrazide [26], nitroso R salt [27], potassium periodate [28], and dimethyglyoxime [29] methods, respectively. The chemical formulae of synthetic samples were obtained based on the chemical analysis results.…”