Mercury adsorption by sulfur- and amidoxime-containing bifunctional silica gel based hybrid materials

Synthesis of silica gel supported salicylaldehyde modified PAMAM dendrimers for the effective removal of Hg(II) from aqueous solution

“…The dehydration losses of physisorbed water under the temperature of 110 were 1.87%, A c c e p t e d M a n u s c r i p t 10 to lower relative pressure while the volume of adsorbed nitrogen decreased with the proceeding of functionalization, which was similar to other functionalized silica gel [18,29]. The BJH desorption pore size distribution is illustrated in Fig.…”

“…It could be seen that the sphere appearance of SiO 2 -G0-SA~SiO 2 -G2.0-SA were similar to that of silica gel, demonstrating that silica gel have excellent mechanical stability and the sphere structure have not been destroyed during the reaction processes. Compared with silica gel, the surface of the functionalized derivatives became rougher, indicating the successful introduction of the functional groups onto the silica gel surface [18]. Thermal stability of silica gel and its functionalized derivatives have been evaluated by TGA and the results are presented in Fig.…”

“…Different types of functional groups, such as those containing nitrogen, oxygen, and sulfur groups have been used to strategically fabricate such hybrid materials [16][17][18][19][20]. The presence of surface functional group affords these hybrid materials the ability to interact strongly with metal ions.…”

“…Recently, the development of silica gel based organic-inorganic hybrid materials for the removal of Hg(II) has become an interesting subject [16][17][18]. Silica gel is an ideal inorganic solid matrix not only due to its well-modified surface property, excellent thermal and mechanical stability, but also to be relative simple in comparison to polymer resin with rapid adsorption kinetics, good swelling resistance in different solvents, and chemical stability [16].…”

Immobilised Metal Affinity Chromatography (Imac) Beads for Lysozyme Separation: Synthesis and Characterization Study

“…The large broad stretching band around 3400 cm -1 corresponds to the associated O-H stretching vibration of the hydroxyl groups and adsorbed water which means the hydrophilic character of the porous silica shown in Figure 2(a). The peaks at around 800 and 566 cm -1 are attributed to the typical symmetric and bending vibration of Si-O-Si in support framework of silica beads, respectively [13]. The band around 975 cm -1 from free silanol groups of silica disappeared or weakened after the modification ( Figure 2 …”