Aminopropyl-modified mesoporous molecular sieves as efficient adsorbents for removal of auxins

Amine-modified SBA-15 and MCF mesoporous molecular sieves as promising sorbents for natural antioxidant. Modeling of caffeic acid adsorption

“…As it was reported in our previous study, the modification with APTES does not change the mesoporous structure of SBA-15 and MCF silicas [6]. Thus, in TEM image illustrates that SBA-15 material is characterized by a parallel mesopore channel system whereas MCF reveals a 3D sponge-like structure with large pores [16].…”

“…p6mm network of mesopores [6] is maintained after the grafting with APTES and AEAPTMS. On the contrary, no XRD diffraction reflexes could be observed in the low angle region for mesocellular foam (see Fig.…”

“…All these features make these materials attractive adsorbents. Thus, mesoporous matrices have been already proven to be efficient supports for adsorption of various bioactive compounds such as anthocyanins [2], flavonoids [3], polyphenols [4,5], plant hormones [6], carotenoids [7], alkaloids [8], vitamins [9], antimicrobial agents [10], glycopeptides [11], natural flavoring agents [12] and drugs [13][14][15]. Among the various classes of mesoporous matrices, SBA-15 (Santa Barbara Amorphous) and MCF (mesocellular foam) silicas are considered promising candidates for application in adsorption.…”

Enhanced nitrobenzene adsorption in aqueous solution by surface silylated MCM-41

“…In general, modification can be conducted by grafting the surface of MCM-41 by means of silanols groups reaction with a silylation reagent, such as 3-aminopropyltrimethoxysilane [8,9], hexamethyldisilazane [10] and trimethylchlorosilane [11,12]. Among the silylation reagents used, it has been reported that trimethylchlorosilane is effective for surface silylation to improve the stability of porous silica materials to moisture and compression [7].…”

Preparation of magnetic porous NiFe2O4/SiO2 composite xerogels for potential application in adsorption of Ce(iv) ions from aqueous solution

“…In contrast to other methods, adsorption has shown great promise for selective separation of Pu from HLLW, and nding an effective material to dispose of radioactive waste has become the research focus. There are varieties of adsorbents such as active carbon, [14][15][16] carbon nano-tubes, [17][18][19] zeolites, [20][21][22] molecular sieves, [23][24][25] ionexchange membranes, [26][27][28] and bio-adsorbents. 29 Among all of these kinds of materials, silica xerogels with high specic surface area (500-1500 m 2 g À1 ), pore volume (0.03-0.35 g cm À3 ), high porosity (80-99%) and plenty of silanol groups (Si-OH) distributed on the surface could be promising materials to use as effective adsorbents for radionuclides.…”