Characterization of Surface Modification, Thermal Stability, and Metal Selectivity Properties of Silica Gel Phases‐Immobilized Dithiocarbamate Derivatives

Synthesis, characterization, and sorption properties of silica gel-immobilized pyrimidine derivative

“…The fragments ions peaks identified from EI-MS of metal adducts with the modified silica gel phase are also listed in Table 3. It was previously reported that binding the modified silica gel phase with a metal ion lead to increase the thermal stability of this phase [27,28]. The same trend was also confirmed from the mass spectra of Si-BzTBA-Cu(II), Si-BzTBA-Hg(II), SiBzTBA-Cd(II), Si-BzTBA-Pb(II).…”

“…In addition, the processes of thermal desorption as well as thermal stability of the loaded organic compounds on the surface of modified silica gel phase at this heating range can be also investigated. Previous studies were found to prove the suitability of the DIP-EI-MS technique for structure identification and thermal properties characterization of some silica phases-chemically immobilized-aliphatic amine and dithiocarbamate derivatives [27,28].…”

Silica coated magnetite particles for magnetic removal of Hg2+ from water

“…For the sample of pure magnetite, the vibrational bands at around 520 cm À1 and 310 cm À1 are characteristic of the m(Fe-O) lattice vibrations [57]. The silica coated magnetite sample shows a band at 1055 cm À1 and weak bands at 789 and 943 cm À1 corresponding to the stretching vibrations of m(SiO-Si), m(Si-OH) and m(Si-O-Fe), respectively [54,55,58]. In the amino modified nanoparticles the stretching band of m(Si-OH) at 790 cm À1 overlaps with the band from the d(N-H) bending vibration [52,58] and at ca.…”

“…Thus silica gel grafted with DTC groups have been used to extract Co 2+ [48,52], Hg 2+ [52][53][54][55], Cu 2+ [48,54] and Cd 2+ [48,54] from aqueous solutions. Here we wish to report a new type of eco-nanomagnets that are composed of SiO 2 coated magnetite functionalized with DTC groups.…”

Speciation, selective extraction and preconcentration of chromium ions via alumina-functionalized-isatin-thiosemicarbazone

“…The utilization of SPE is mainly based on either chemical of physical immobilization or adsorption of certain organic compounds on the surface of some solid inorganic or organic solid supports. Selection of the organic compounds and solid supports is usually based on different aimed properties that must be present in the newly designed solid phase extractors and preconcentrators [23][24][25][26][27].…”