Abstract
In the present study, iron-alginate gel beads (Fe-Alg gel beads) were synthesized by the entrapment method and subsequently, the prepared gel beads were characterized by FTIR, SEM, and EDX analysis methods. The characterization studies showed that Fe-Alg gel beads were of spherical morphology and iron was successfully entrapped in alginate. Subsequently, the synthesized Fe-Alg gel beads were used as a heterogeneous catalyst for the decolorization of a hazardous azo-dyestuff, Procion Red MX-5B (PR MX-5B), with Fenton-like decolorization. The effects of process parameters such as initial pH, H2O2 concentration, initial dye concentration and catalyst concentration on Fenton-like decolorization were investigated. For Fenton-like decolorization of PR MX-5B, the optimum process parameters were determined to be pH: 3.0, 20 mµ of H2O2 concentration, 50 mg/L of initial dye concentration, and 5.0 g/L of catalyst concentration, respectively. The reaction kinetics was well fitted to second order reaction kinetics. As a result, the synthesized gel beads have a high color removal efficiency for PR MX-5B dye from an aqueous solution.
Highlights
Nowadays, dyes are utilized in approximately all industrial sectors; dye-laden wastewaters contaminate natural waters and reduce water’s appreciate in use [1]
The morphology and elemental analysis of the synthesized gel beads were investigated by Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Analysis (EDX) analysis, respectively, before and after decolorization
According to the EDX results, the prepared Fe-Alg gel beads involve the elements of Fe, Ba, C, O, Cl, Pt, Pd, Na, N, S, and Al before reaction
Summary
Dyes are utilized in approximately all industrial sectors; dye-laden wastewaters contaminate natural waters and reduce water’s appreciate in use [1] For this reason; several physicals, chemical and biological treatment methods such as adsorption, ion-exchange, photocatalysis, membrane separation, coagulation, electrocoagulation, and wet air oxidation have been tested to remove dye effluents and many of these techniques have their advantages and disadvantages. These advanced processes are not always efficient enough since the removal of dyes are difficult due to their water solubility and high molecular strength. The complicated organic molecules could be either oxidized to smaller organics or entirely mineralized to carbon dioxide (CO2) and water (H2O) by OH radicals under treatment by AOPs [5]
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