Comparison of three Mexican aluminosilicates for the sorption of cadmium

Modeling batch kinetics of copper ions sorption using synthetic zeolite NaX

“…As, also, can be seen from Tables 3 and 4 rate constant decreases with the concentration and increases with the temperature indicating that in a system with lower initial concentration equilibrium is established faster as well as at the higher temperatures. Ritchie second-order model is based on a general second-order reaction mechanism for sorption on heterogeneous solid phase [19]. These results have again suggested that the copper ions sorption is controlled by second-order mechanism.…”

“…The Ritchie mode was developed originally to describe the kinetics of gas-solid phase adsorption, but its use was extended to liquid-solid sorption [18][19][20]. The basic assumptions of Ritchie second-order model are: one sorbate is sorbed onto two reaction sites, rate of sorption depends solely on the fraction of the sites witch are unoccupied at time t [18,20].…”

Adsorbents for the removal of arsenic, cadmium, and lead from contaminated waters

“…Al2O3/Fe(OH)3 [13] Al2O3/Fe(OH)3 [13] Alcaligenes eutrophus [14] Adsorbents, agricultural [15] Alumina, activated [16] Alginate bead with iron [17] Algae, marine, dead biomass [18] Algae, marine, dead biomass [19] Alumina, iron hydroxide coated [20] Alumina, activated [21][22][23] Algae, Nile water [24] Alginate beads [25] Bauxsol, activated [26,27] Alumina, iron hydroxide coated [20] Alginate carriers [28] Apricot stone [29] Biomass [30] Bauxite, calcined [31] Aluminosilicates [32] Ash, brick kiln [33] Cactaceous powder [34] Bauxsol [35] Aluminum electrodes [36] Azolla filiculoides [37] Carbon, char [38] Bauxsol-coated sand [35] Anthracite [39] Bacteria, sulfate reducing [40] Carbon, coconut husk [41] Bauxsol, activated [26,27] Aragonite shells [42] Bagasse fly ash (1998) [43] Cellulose (bead) with iron oxyhydroxide [44] Biomass, yeast, methylated [45] Ascophyllum nodosum [46] Bagasse fly ash (2004) [47] Cement, iron oxide coated [48] Carbon, activated [49] Aspergillus niger, live …”

Cadmium leaching from thermal treated and gamma irradiated Mexican aluminosilicates

“…The liquid phases were separated from the solids by centrifugation and cadmium in the aqueous phases was determined by atomic absorption spectrometry [3]. The materials samples exchanged with cadmium were referred as Cd-Zcrem, CdZfran and Cd-kaolinite.…”

“…The reprocessing wastes solutions from LWR fuel irradiated to a fairly typical burn up contain 115 mg/kg U of radioactive isotopes of cadmium [2]. 109 Cd, and 113m Cd have half lives long enough to warrant potential concern, and their presence in environment is a potential health hazard, because of their ( 109 Cd and 113m Cd) high specific activity, radioactive decay and chemical toxicity [3].…”