Surface Characters and Adsorption Behavior of Pb(II) onto a Mesoporous Titanosilicate Molecular Sieve

Influence of mesoporosity on the sorption of 2,4-dichlorophenoxyacetic acid onto alumina and silica

“…Sorption into pores diminishes the efficacy of chemical extraction and reduces the bioavailability of such compounds [2,[5][6][7]. Studies of hydrophobic organic contaminants (HOCs) indicate that several physical and chemical mechanisms, including increased adsorption energy resulting from compound interaction within pores, may enhance HOC retention in mineral micropores with a porous adsorbents effectively remove organic compounds and heavy metals from contaminated waters [12][13][14][15][16][17][18][19]. Other evidence also supports the likelihood that mineral mesopores may enhance organic compound sorption processes.…”

Interface Chemistry of Nanostructured Materials: Ion Adsorption on Mesoporous Alumina

“…Mesoporous silica with a monolayer of thiol (-SH) groups grafted on its pore surface displays a high sorption capacity for removing mercury from aqueous solutions (7,8). Uncalcined mesoporous silicate materials synthesized with hexadecyltrimethylammonium bromide as a template are able to remove significant amounts of trichlorethylene and tetrachloroethylene from water (9), while calcined mesoporous silicates or titanosilicates were found to have the capability to remove copper, lead, and uranyl ions from aqueous solutions (10)(11)(12). Furthermore, an ordered mesoporous anion-exchange inorganic/organic hybrid resin has been suggested for radionuclide separation (13).…”

Surface complexation modeling of arsenic(III) and arsenic(V) adsorption onto nanoporous titania adsorbents (NTAs)

“…However, the model somewhat overestimated removals at pH 4.5-7.5 with [As(III)] o = 45.6 lM. These discrepancies between sorption data and model prediction may be attributed to overlap of the electrical double layer (EDL) by an intraparticle porosity of the NTAs [28,29]. Our hypothesis for determination of the surface complexation constants is to rule out the effect of porosity because the FITEEQL program used does not include it as a model parameter.…”