Adsorption Capacity of Smectite Clay and Its Thermal and Chemical Modification for Two Anionic Dyes: Comparative Study

Abstract The present research evaluates the influence of modification smectite clay (BC) on its adsorption capacity anionic dyes from aqueous solutions. Thermal (BC 250), acidic H 2 SO 4 ), and alkaline NaOH) was carried out. clays were characterized by X-ray powder diffraction, energy-dispersive spectroscopy, Fourier transform infrared spectroscopy. Adsorption investigated batch experiments at room temperature (23 ± °C), a wide range initial dye concentrations (1–1000 mg/dm 3 an adsorbent dose 50 g. All modifications increased clay’s for Reactive Red 198, in order BC > NaOH 250 BC; it 10.32, 5.06, 3.32, 2.92 mg/g, respectively. Acid thermal 18, series NaOH; 3.07, 2.66, 2.16, 1.28 experimental data analyzed Freundlich, Langmuir, Dubinin–Radushkevich, Sips isotherms, using nonlinear regression. best fitted isotherm. Taking into account structure adsorbates results obtained, can be concluded that probably bound through chemisorption, forming hydrogen bonds between Si–OH Al–OH groups –NH, –NH , –OH dyes. From is promising material adsorption.