Aspects of surface modification, structure characterization, thermal stability and metal selectivity properties of silica gel phases-immobilized-amine derivatives

Selective extraction of toxic heavy metal oxyanions and cations by a novel silica gel phase functionalized by vitamin B4

“…However, the surface coverage value of [Si-NH 2 ], as determined by thermal desorption method, was found to be 1.780 mmol g −1 . This value is consistent with previously reported surface coverage values [25]. The reason for [Si-NH 2 -VB4]'s low surface coverage value, when compared to that of [Si-NH 2 ], is mainly due to the bulkiness of ChCh, when compared to other members from the amino group [26].…”

“…Thus, the metal uptake-and sorption properties identified and characterized in [Si-NH 2 -VB4] for binding and extraction of metal ions are mainly due to the contribution of the free nitrogen amino-groups that are not bound to VB4 via hydrogen bond formation. The free amino groups behaved to some extent as the previously reported [Si-NH 2 ] in the process of metal binding and extraction, especially in the case of Hg(II), Cu(II), Cd(II) and Pb(II) [25,26].…”

Application of Modified Silica Coated Magnetite Nanoparticles for Removal of Iodine from Water Samples

“…The silica coated magnetite nanoparticles derivative moiety was prepared by reaction with 3-chloropropyltrimethoxysilane (CPTS) as silylation agent [30]. A sample of 10.0 g of silica coated magnetite nanoparticles was suspended in 50 mL of dry toluene and 10.66 mmol of CPTS was added to this suspension.…”

Removal of transition metal ions from aqueous solutions by adsorption using a novel hybrid material silica gel chemically modified by triethylenetetraminomethylenephosphonic acid

“…Such kinds of materials have received a great deal of attention recently because of their excellent performance in the field of chromatography, adsorption, and catalysis [4][5][6]. Chemical modification of the skeleton of silica gel via the covalent coupling of an organic moiety is a promising approach to obtain such kind of silica gel-based materials [7], therefore, many chemically modified silica gel have been synthesized during the past three decades, and it has been found that the behavior of these solids used as adsorbent are mainly dependent on the presence of active donor atoms such as O, S and N of the incorporated organic moieties [8][9][10]. In the previous work in our group, we have introduced polyamine to the surface of silica gel through amido bond to obtain some novel adsorbents [11].…”