Über die Adsorption in Lösungen

Dyes adsorption using clay and modified clay: A review

pH-dependent surface charging and points of zero charge. IV. Update and new approach.

The MoS42– ion was intercalated into magnesium–aluminum layered double hydroxide (MgAl—NO3-LDH) to produce a single phase material of Mg0.66Al0.34(OH)2(MoS4)0.17·nH2O (MgAl—MoS4-LDH), which demonstrates highly selective binding and extremely efficient removal of heavy metal ions such as Cu2+, Pb2+, Ag+, and Hg2+. The MoS4-LDH displays a selectivity order of Co2+, Ni2+, Zn2+ < Cd2+ ≪ Pb2+ < Cu2+ < Hg2+ < Ag+ for the metal ions. The enormous capacities for Hg2+ (∼500 mg/g) and Ag+ (450 mg/g) and very high distribution coefficients (Kd) of ∼107 mL/g place the MoS4-LDH at the top of materials known for such removal. Sorption isotherm for Ag+ agrees with the Langmuir model suggesting a monolayer adsorption. It can rapidly lower the concentrations of Cu2+, Pb2+, Hg2+, and Ag+ from ppm levels to trace levels of ≤1 ppb. For the highly toxic Hg2+ (at ∼30 ppm concentration), the adsorption is exceptionally rapid and highly selective, showing a 97.3% removal within 5 min, 99.7% removal within 30 min, and ∼100% remov...

Highly Selective and Efficient Removal of Heavy Metals by Layered Double Hydroxide Intercalated with the MoS42– Ion

The recovery of uranium (U) from seawater has been investigated for over six decades in efforts to secure uranium sources for future energy production. The majority of the research activities have focused on inorganic materials, chelating polymers, and nanomaterials. Previous studies of uranium adsorption from aqueous solutions, mainly seawater, are reviewed here with a focus on various adsorbent materials, adsorption parameters, adsorption characterization, and marine studies. Continuous progress has been made over several decades, with adsorbent loadings approaching 3.2 mg U/g adsorbent in equilibrium with seawater. Further research is needed to improve first, the viability including improved capacity, selectivity, and kinetics, and second, the sorbent regeneration for multicycle use. An overview of the status of the uranium adsorption technology is provided and future research needs to make this technology commercially competitive are discussed.

Recovery of Uranium from Seawater: A Review of Current Status and Future Research Needs

Amine–modified polyacrylamide–bentonite composite for the adsorption of humic acid in aqueous solutions

Kinetic and equilibrium characterization of uranium(VI) adsorption onto carboxylate-functionalized poly(hydroxyethylmethacrylate)-grafted lignocellulosics.

Improved performance of a cellulose-based anion exchanger with tertiary amine functionality for the adsorption of chromium(VI) from aqueous solutions

Synthesis and characterization of humic acid immobilized-polymer/bentonite composites and their ability to adsorb basic dyes from aqueous solutions.

Synthesis and characterization of tannin-immobilized hydrotalcite as a potential adsorbent of heavy metal ions in effluent treatments

P.S. Suchithra

Papers

Amine–modified polyacrylamide–bentonite composite for the adsorption of humic acid in aqueous solutions

Kinetic and equilibrium characterization of uranium(VI) adsorption onto carboxylate-functionalized poly(hydroxyethylmethacrylate)-grafted lignocellulosics.

Improved performance of a cellulose-based anion exchanger with tertiary amine functionality for the adsorption of chromium(VI) from aqueous solutions

Synthesis and characterization of humic acid immobilized-polymer/bentonite composites and their ability to adsorb basic dyes from aqueous solutions.

Synthesis and characterization of tannin-immobilized hydrotalcite as a potential adsorbent of heavy metal ions in effluent treatments