Adsorption of hazardous cationic dye onto the combustion derived SrTiO₃ nanoparticles: Kinetic and isotherm studies

Abstract

In this article we report on solution combustion method to synthesize SrTiO 3 nanoparticles (ST-NPs) and the removal of malachite green (MG) azo dye from the aqueous solution. The synthesized ST-NPs were calcined at 600 • C for 2 h. Powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) were used to characterize the product. Adsorption experiments were performed with cationic malachite green (MG) dye. ∼98% dye was adsorbed onto the ST-NPs at pH 10 for 30 min of the contact time. The optimum adsorbent dose was found to be 0.015 g/L of the dye. To study the adsorption kinetics Langmuir Hinshelwood model was used and the first order kinetic best describes the MG adsorption onto the ST-NPs. The adsorption isotherms data of MG onto ST-NPs obtained were analyzed by Langmuir and Freundlich isotherm models and the results describe the best representation of the Langmuir isotherm model.

Zeolites in Phenol Removal in the Presence of Cu(II) Ions—Comparison of Sorption Properties after Chitosan Modification

“…where K F ((mg/g(L/mg) 1/n ) and n are the Freundlich constants [36]. The Dubinin-Radushkievich isotherm is generally applied to find the adsorption mechanism onto the heterogeneous surface.…”

Basic Dye Adsorption onto Clay/MnFe2O4 Composite: A Mechanistic Study

“…With increase in pH, the H þ ions formation decreased and a negative charge was generated on the adsorbent surface, which enhanced the CV adsorption due to the electrostatic attraction. The adsorption behavior revealed that an electrostatic interaction mechanism was prominent in the adsorption of CV dye (Bhagya et al, 2016;Etim et al, 2012). Moreover, an increase in diffusion process also increased the movement of dye molecules towards adsorbent active sites.…”

The Sorption Performance of Cetyl Trimethyl Ammonium Bromide-Capped La0.9Sr0.1FeO3 Perovskite for Organic Pollutants from Industrial Processes

“…The appearance of these bands proved that the CTAB surfactant modification of La 0.9 Sr 0.1 FeO 3 perovskite was successful. At a pH value > the point of zero charge, the perovskite acquired negative charges, which can attract the ammonium moieties in CTAB, resulting in the CTAB-capped perovskite [26,31]. The phase identification showed that a single orthorhombic phase of LaFeO3 was formed, with higher d-values than those of the standard LaFeO3 sample.…”

“…It is well known that the pH value can greatly affect the removal efficiency of a sorbent. For most perovskites, the point of zero charge is about 5 [26,31]. Therefore, the perovskite is positively charged at pH < 5, and it is expected to have its highest sorption ability for the anionic dye under acidic conditions.…”

“…The removal of organic dyes using perovskite sorbents was reported in the literature. SrTiO 3 nanoparticles were used for the removal of the anionic congo red (CR) [30], and the cationic malachite green dye [31]. Silica-coated LaMnO 3 perovskite was used for the removal of cationic methylene blue and anionic methyl orange dyes [32].…”