Study of Hg2+ Sorption from Water Solutions by Mesoporous Silica with Thiourea Functional Groups

Modification of Ceramic Membranes by Silica Nanoparticles with Thiourea Functions

“…Its presence is associated with the formation of a three-dimensional polysiloxane network [26]. There are wide bands at~3300 cm -1 and~3700 cm -1 assigned to ν(NH) of thiourea fragment and ν(ОН) stretches of sorbed water in all DRIFT spectra [12,17]. The overlapping of these bands occurs because all the samples contain the water on the surface.…”

“…Porous materials with thiourea groups in the surface layer are proved to be perspective for the sorption of heavy metal ions from aqueous solutions. Earlier, the scientists from our research team developed a one-step technique for the synthesis of the xerogels [12], the bridged xerogels [12,13], mesoporous MCM-41 [12,14], and SBA-15 [15,16] type materials with thiourea functional groups and showed their ability to remove mercury(II) and silver(I) ions from aqueous solutions [12,16,17].…”

Features of the surface layer structure of the magnetosensitive materials functionalized by silica with thiourea groups and their applying for selective Cu(II) and Au(III) ions removal

“…HCl was used also at one of the stages of synthesis for prehydrolysis of TEOS [13]. The catalyst for ETUS was chosen to be ammonium fluoride, previously used to obtain xerogels [34] and bridged xerogels [35] with thiourea groups, in such a quantity that the gelation occurred within 4 h. So, all these parameters were determined and utilized for the synthetic procedure.…”

“…In the preparation of xerogels with thiourea groups, the ratio between structure agent and ETUS affected the porosity, the concentration of functional groups, and the sorption capacity [34]. It was shown that with a decrease in ETUS in the reaction mixture, the values of specific surface area increased and the number of functional groups decreased, while the sorption capacity to mercury increased.…”

Synthesis of Polysiloxane-Immobilized Monoamine, Diamine, and Triamine Ligand Systems in the Presence of CTAB and Their Applications

“…8,9 Later, and in a parallel to this research, several publications dealt with functionalized polysiloxane ligand systems and their applications were also reported. [10][11][12] These functionalized polysiloxane ligands were also used for extraction and separation of metal ions. [12][13][14][15] Another family of these materials is functionalized mesoporous polysiloxane ligands, possessing different forms of porous structures, which has been also developed.…”