Physico-chemical characterization of bentonite and its application for Mn2+ removal from water

Abstract

Bentonite is mainly composed of clay minerals from smectite group, therefore it has a well developed and chemically active surface area and high cation exchange capacity. Moreover, an interlayer space of smectite has unusual hydration properties, which manifest as swelling of bentonite in water. These properties make bentonite as a commonly used raw material in chemistry and industry, and it is very important in environmental protection and water treatment as an effective sorbent of heavy metals. The results of X-ray diffraction, a cationic exchange capacity, specific surface area, acid-base properties of the surface and the swelling index showed that the bentonite sample contains mostly montmorillonite. The aim of this study was to test the efficacy of bentonite in the removal of Mn2+ from aqueous systems. The experimental results of Mn2+ adsorption on the bentonite were interpreted by Langmuir, Freundlich and Dubinin-Radushkevich adsorption isotherms. The adsorption isotherm studies indicate that the adsorption of Mn2+ follows Langmuir isotherm very well. Theoretical monolayer saturation capacity according to Langmuir model was 12.41 mg/g. The removal of Mn2+ is achieved by ion exchange mechanism with naturally occurring cations in bentonite, as well as by forming the inner- and outer-sphere complexes with bentonite surface

The Potential of Bentonite as a Low-cost Adsorbent for the Removal of Heavy Metal Ions from Multicomponent Aqueous Systems of the Galvanic Industry

“…The analysis of the diffraction maxima confirmed the presence of montmorionite (M), while the other crystalline phases were quartz (Q) and cristobalite (C) [26]. Similar values of the diffraction maximums on the bentonite sample were also obtained by Petrović R. et al and Ranđelović M. et al [27,28].…”

Synthesis and characterization of CuS nanocomposites by using alumina channel-technique

“…The high value of capacitance at low frequencies is mainly due to space charge polarization and rotational polarization. The values are shifted upward as temperature increases(from 30 °c to 50 °c and also from 150 °c to 250 °c).As the temperature increases more and more dipole will be oriented resulting in increased value of dipole moment and also dielectric constant and capacitance of sample also 6,7 .…”

The influence of organic modification on the structural and adsorptive properties of bentonite clay and its application for the removal of lead

“…Rapid modification using dyes TBAC and CTAB was observed due to a higher cationic exchange capacity and ultrasound effect [8]. The physico-chemical characterization of bentonite and its application for the removal of Mn 2+ from aqueous systems were studied and the efficiency of bentonite was determined using Langmuir, Freundlich and Dubinin-Radushkevich theory models [9]. A promising candidate for the removal of heavy metals is the magnetically modified bentonite [10].…”