Adsorption characteristics of UO22+ and Th4+ ions from simulated radioactive solutions onto chitosan/clinoptilolite sorbents

Facile fabrication of chitosan/poly(vinyl amine) composite beads with enhanced sorption of Cu2+. Equilibrium, kinetics, and thermodynamics

“…Chen et al have investigated the influence of the ECH:CS molar ratio on the adsorption properties of heavy metal ions, a dramatic decrease of the SC being found when the ECH:CS molar ratio was 3:1 [10]. To enhance the sorption capacity for heavy metals and dyes, various CS composites with a high chemical stability have been recently promoted [3,[14][15][16][17][18][19][20]. This prompted us to investigate the preparation of some novel composites as beads based on CS and the synthetic polycation poly(vinyl amine) (PVAm), which has the highest density of primary amine groups (18 meq/g).…”

Direct synthesis of dimethyl ether on the admixed nanocatalystsof CuO–ZnO–Al2O3 and HNO3-modified clinoptilolite at high pressures: Surface properties and catalytic performance

“…There are two groups of frequencies of vibrations in all zeolites: internal vibrations of T-O and vibration of external linkages between tetrahedral [32]. The band at 470 cm À1 is resulted from the stretching vibrations of T-O bands and The peak at 600 cm À1 is assigned to the vibration of the external linkage of the tetrahedral [33]. The weak vibrations at 725 cm À1 are ascribed to T-O external symmetric stretching vibrations [34].…”

An Amidoximated-UHMEPE Fiber for Selective and High Efficient Removal of Uranyl and Thorium from Acid Aqueous Solution

“…The polyhydroxyethylmethacrylate-pumice composites [10] possess high affinity to the uranium and thorium ions at different pH, ion concentration, and ionic strength. The chitosan/clinoptilolite sorbents [17] also have high affinity for uranium and thorium ions in simulated radioactive solution in the presence of Cu 2+ , Fe 2+ and Al 3+ .…”