Abstract
Adsorption of anthraquinone dye Acid Blue 111 by alumina-iron oxide doped particles prepared by sol-gel method from aqueous solutions was studied. The adsorbent morphology was revealed by FESEM and the crystallographic phase is analyzed by the XRD technique. The effect of adsorbate and adsorbent concentrations, pH value, type of adsorbent and thermodynamic parameters on dye removal by adsorption was studied. The change of dye concentration during the adsorbtion was followed using the UV-Visible spectrophotometer. The change of the adsorbent surface before and after dye removal was observed using the Fourier Transformation-infrared spectroscopy (FT-IR). The adsorption kinetics is in accordance with the pseudo-second-order kinetics model. The Langmuir and Freundlich adsorption isotherm models were used to describe the adsorption process. The thermodynamic study of dye adsorption proves the process is spontaneous with exothermic nature.
Highlights
With the rapid development of civilization, more demanding requirements in water quality have been set in the industry as well
The effect of the initial alumina-iron oxide doped particles sintered at 800 °C with 4 wt.% of iron salt, concentration was studied at a constant dye concentration, temperature, and pH value
The sample of the alumina-iron oxide doped particles sintered at 800 °C with 4 wt.% of FeCl3∙6H2O has lower adsorption capacity and the efficiency of dye removal than the sample at 700 °C
Summary
With the rapid development of civilization, more demanding requirements in water quality have been set in the industry as well. Other forms of alumina such as κ and η could be potentially good for the removal of organic matter from solutions Those structures are usually analyzed by X-ray diffraction (XRD) technique and the crystallographic structure as well as the size of crystallites can be obtained this way. We report an investigation of the adsorption capacity of alumina-iron oxide doped particles prepared by sol-gel method with different content of iron at different temperatures. Dye removal during the time using alumina-iron oxide doped particles as adsorbent was followed by ultraviolet-visible (UV/Vis) spectroscopy. The alumina-iron oxide doped particles were used as adsorbent of anthraquinone dye Acid Blue 111 produced by Hoechst A. G., Germany) and the synthesized different alumina-iron oxide doped particles of known concentration in a thermostated glass reactor. The influence of temperature on adsorption efficiency was tested by adjusting the temperature in a Maple scientific circulating water bath SB-5 (United Kingdom)
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