Influence of bridged monomer on porosity and sorption properties of mesoporous silicas functionalized with diethylenetriamine groups

Abstract

Mesoporous organosilicas functionalized simultaneously with both pendant amine groups and ethylene/phenylene bridges, were synthesized to evaluate the effect of the bridges incorporated in the silica framework on the structure, porosity and adsorption properties of final materials. It turned out that the presence of the bridges enhanced the formation of porosity but adversely affected the efficiency of amination. DFT theoretical calculation showed that the amine groups can be partially bonded by phenyl groups of the bridges. The obtained materials were tested as sorbents of diclofenac, which is considered as one of the most prominent hazardous pharmaceuticals. High uptakes of diclofenac reaching 842 mg g −1 proved that the obtained materials could be applied for removal of drugs from waters and wastewaters, particularly when high concentrations of pharmaceutical are considered. For the phenylene bridged-based materials the diclofenac adsorption occurs only in the pores while for the others also on the external surface as indicated by different diclofenac desorption kinetics-this observation can be used to modulate the releasing profiles of drugs via proper design of the surface.

Metal-Loaded Carbonated Mesoporous Calcium Silicates: Synthesis, Characterization, and Application for Diclofenac Removal from Water

“…Three diffraction peaks identified at the low Bragg angles of approximately 2θ = 1.0, 2.2, and 3.4° (Figure a) can be indexed as (1 0 0), (1 1 0), and (2 0 0) reflections, respectively. A similar observation was reported by other scholars for the Ca/Si-based materials. ,,, The result confirmed that the Ca/Si-based materials exhibited a high degree of hexagonal mesoscopic structure (2D p 6 mm ). In contrast, a wide peak observed at the range of 2θ = 15–70° (attributed to SiO 2 ) in the wide-angle XRD patterns (Figure b) indicated the typical amorphous structure of the Ca/Si-based materials, which is well-consistent with the literature. ,, Therefore, it can be concluded that the loading process of metals did not significantly affect the original phase structure of the calcium silicate nanoparticles.…”

Tailoring Surface Chemistry of Sugar-Derived Ordered Mesoporous Carbons towards Efficient Removal of Diclofenac from Aquatic Environments

“…% solution of NaCl was used as DICL desorption medium from the loaded samples. Its desorption efficiency was confirmed by us previously in the case of silica materials, where an increase of the ionic strength resulted in significant desorption of DICL [48,49]. The relative desorption efficiencies (RDE) are given in Table 3.…”

Biphasic composite of calcium phosphate-based mesoporous silica as a novel bone drug delivery system

“…Both the BET surface area closed to 128 m 2 /g and the broad distribution of pores with no clear peak in pore size distribution (Supplementary material 3) suggest almost the non-porous state of pure 100CaP. The N 2 isotherms of parent 100MSi and 10CaP@MSi showed a type IV with a reversible isotherm for MSi and H1-type hysteresis for 10CaP@MSi, corresponded to cylindrical mesopores [29]. For the 20CaP@MSi and 30CaP@MSi, the adsorption isotherms were characterized by two separated steps, corresponding to N 2 condensation in the MSi (at low pressure) and in the CaP domains (at high pressure).…”