Adsorption of Antimony(III) onto Fe(III)-Treated Humus Sludge Adsorbent: Behavior and Mechanism Insights
Polish Journal of Environmental Studies
In this study, adsorption behaviors and mechanism of Sb(III) ions onto Fe(III)-treated humus sludge adsorbent (FTHSA) from aqueous solutions was investigated using batch adsorption techniques, Fourier transform infrared (FT-IR) spectra and scanning electron microscopy coupled to an energy dispersive spectrometer (EDS). FTHSA was prepared via immersing with 1 mol/L FeCl3. The effects of dosage, contact time, Sb(III) initial concentration and pH on the adsorption of Sb(III) onto FTHSA were
... o FTHSA were investigated. Sb(III) adsorption was favored at pH with 2.0 and decreased dramatically with increasing pH. The description of equilibrium data of Sb(III) adsorption by Langmuir, Freundlich and Dubbin-Radushkevich isotherm models showed that Langmuir model provided the best fit for Sb(III) adsorption with maximum adsorption amount of 9.433 mg/g. Pseudo-first-order, Pseudo-second-order, Elovich and Intraparticle diffusion model were applied to describe the adsorption process of Sb(III) ions onto FTHSA. The results showed that pseudo-second-order model described well for Sb(III) adsorption and chemical adsorption played a dominant role in the adsorption process. The FT-IR spectra also indicated that the chemical interactions as ion exchange among the metal ions and N-H, O-H, C=O, COO, C-O were mainly involved in the adsorption process. Therefore, FTHSA has a suitable potential removal for Sb(III) ions in practical process.