A review on the adsorption of heavy metals by clay minerals, with special focus on the past decade

Understanding the factors affecting the adsorption of Lanthanum using different adsorbents: A critical review

Polyethylenimine-cross-linked cellulose nanocrystals for highly efficient recovery of rare earth elements from water and a mechanism study

Adsorption of lanthanum (III) from aqueous solution using 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester-grafted magnetic silica nanocomposites

Functional magnetic nanoparticle/clay mineral nanocomposites: preparation, magnetism and versatile applications

Influence of salt solutions on the swelling pressure and hydraulic conductivity of compacted GMZ01 bentonite

Bentonite has been studied extensively because of its strong adsorption capacity. A local Na-bentonite named GMZ bentonite, collected from Gaomiaozi County (Inner Mongolia, China), was selected as the first choice of buffer/backfill material for the high-level radioactive waste repository in China. In this research, the adsorption of La (ΙΙΙ) onto GMZ bentonite was performed as a function of contact time, pH, solid content and metal ion concentrations by using the batch experiments. The results indicate that the adsorption of La (III) on GMZ bentonite achieves equilibration quickly and the kinetic adsorption follows the pseudo-second-order model; the adsorption of La (III) on the adsorbent is strongly dependent on pH and solid content, the adsorption process follows Langmuir isotherm. The equilibrium batch experiment data demonstrate that GMZ bentonite is effective adsorbent for the removal of La (III) from aqueous solution with the maximum adsorption capacity of 26.8 mg g−1 under the given experimental conditions.

Adsorption of La(III) onto GMZ bentonite: effect of contact time, bentonite content, pH value and ionic strength

Preparation, characterization and adsorptive study of rare earth ions using magnetic GMZ bentonite

During the long-term operation of a deep geological repository, infiltration of pore fluids with different chemical compositions can influence the swelling behavior of the compacted bentonite. In this paper, using a self-developed swelling deformation apparatus, one-dimensional free swelling tests were conducted on densely compacted GMZ01 bentonite specimen with an initial dry density of 1.70 g/cm3, with infiltration of de-ionized water, NaCl, or CaCl2 solutions at different concentrations. Results show that the swelling strains of GMZ01 bentonite specimens infiltrated with salt solutions were significantly lower than that of those infiltrated with de-ionized water. In fact, the swelling strain decreased in a form of power function with the increasing concentration of infiltration solutions. For a given concentration, the one-dimensional swelling strain of specimens contacted with NaCl solutions was higher than that of the specimens infiltrated with CaCl2 solutions. However, the difference of the swelling strains decreased with increasing concentrations. This phenomenon could be explained by the impact of cation types on the microstructure of bentonite.

Influence of salt solutions on the swelling behavior of the compacted GMZ01 bentonite

Impact of cyclically infiltration of CaCl2 solution and de-ionized water on volume change behavior of compacted GMZ01 bentonite

Chunming Zhu

Papers

Influence of salt solutions on the swelling pressure and hydraulic conductivity of compacted GMZ01 bentonite

Adsorption of La(III) onto GMZ bentonite: effect of contact time, bentonite content, pH value and ionic strength

Preparation, characterization and adsorptive study of rare earth ions using magnetic GMZ bentonite

Influence of salt solutions on the swelling behavior of the compacted GMZ01 bentonite

Impact of cyclically infiltration of CaCl2 solution and de-ionized water on volume change behavior of compacted GMZ01 bentonite