Bromate adsorption using Fe-pillared bentonite

Abstract

Bromate is an emerging hazardous substance in drinking water. In this study, the removal ofbromate by Fe-pillared bentonite was investigated using various experimental parameters: contact time, initial concentration (Co), temperature, initial pH and competing anions. The adsorption ofbromate followed the pseudo-second-order kinetic better than it followed other kinetic models, and the pseudo-second-order kinetic study showed that equilibrium could be achieved within 60 min. Equilibrium isotherms were analyzed by Freundlich, Langmuir, Redlich-Peterson and Toth isotherm models. The Toth and Redlich-Peterson models better represented the bromate adsorption. Results also indicated that, other than the competing anions and solution pH, temperature was a key parameter affecting adsorption. It was ultimately concluded that Fe-pillared bentonite was effective at removing bromate from water.

Congo red dye removal from aqueous solution by acid-activated bentonite from sarolangun: kinetic, equilibrium, and thermodynamic studies

“…The sharp vibration band at wavenumber 1041 cm À1 is reported as the stretching vibration of Si-O group (He et al, 2012). Due to the dissolution during the acid activation, the band of the Si-O group decreased.…”

Bentonite Impregnation Ammonium-Assisted as Eco-Friendly Dye Adsorbent: Analyses of Kinetics and Thermodynamics in Cationic Dye Adsorption

“…The spectra shifting of bent from 3618 to 3626 cm -1 , bent-Na from 3448 to 3425 cm -1 , and bent-NH from 3448 to 3441 cm -1 after impregnation associated with the OH groups [33]. Simultaneously, a specific band at 1635 cm -1 was associated with the Al-OH vibration [34], and a sharp band at 1033 cm -1 was associated with the Si-OH group [35]. The specific spectra that show the Al-O-Si group and NH4 + oscillations were located at wavelengths 532.3 and 470.6 cm -1 from stretching bands and bond vibrations [36], [37].…”

Optimization of bromate adsorption onto Fe-CNTs nanocomposite using response surface methodology

“…Amongst them, adsorptive processes are especially advantageous due to their relatively low implementation and operational costs and because they avoid the generation of transformation products with unknown toxicity effects. Activated carbon (Zhang et al, 2015;Chen et al, 2017), a widely used adsorbent in water treatment applications, and other adsorbent materials, such as biochar, zeolites, materials with layers of MnO 2 , TiO 2 , CeO 2 on their surfaces, and polymeric resins (Ji et al, 2017;He et al, 2012;Alsewaileh et al, 2019;Yang et al, 2019;Barlokova et al, 2017), have been tested for the removal of BrO 3 − from water.…”