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Silica gel

About: Silica gel is a research topic. Over the lifetime, 22313 publications have been published within this topic receiving 325516 citations. The topic is also known as: Amorphous silica & Precipitated amorphous silica.


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Journal ArticleDOI
TL;DR: In this paper, the authors used low angle XRD data to identify the iron species supported on the silica matrix are constituted of hematite and maghemite, which were more perturbed by Fe2+ than by Fe3+ ions, as confirmed by TEM images.
Abstract: Fe2O3/mesoporous silica catalysts were prepared by adding Fe2+ or Fe3+ ions, as an iron precursor, during the synthesis of silica gel. Low angle XRD data showed that both iron precursors affected the hexagonal ordered arrays of silica, which were more perturbed by Fe2+ than by Fe3+ ions, as confirmed by TEM images. Based on the Mossbauer spectroscopy, XPS, EPR and NH3-TPD data was possible to identify the iron species supported on the silica matrix are constituted of hematite and maghemite. The iron precursor strongly changed the specific area of the materials from 1406 m2 g−1, in pure silica sample, to 1165 and 799 m2 g−1 for the Fe3-MS and Fe2-MS samples, respectively, but the pore size distribution was maintained in the range of 15–40 A in both samples. These Fe-containing silica nanoparticles showed good catalytic activity to degrade methylene blue in aqueous medium. However, the Fe3-MS sample was more active than the Fe2-MS sample because the iron in the first is more exposed, which facilitated the accessibility to the active Fenton-like sites. These synthesized samples showed to be more stable against the Fe leaching than samples prepared by simple impregnation of hematite on the silica surface. This was because the strong interaction of iron and silica matrix was achieved by adding iron in the course of the synthesis of silica gel.

76 citations

Journal ArticleDOI
TL;DR: In this paper, the impact of surface modified silica for the purpose of rare earth elements (REE) recovery from both artificial and real waste water was investigated using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Brunauer Emmett Teller (BET) and Zeta potential measurements to better understand about the surface modification of the gels.

76 citations

Journal ArticleDOI
01 Feb 1986-Fuel
TL;DR: In this article, a ligand exchange column chromatography (LEC) was used for the isolation of sulphur heterocycles (PASH) from the aromatic fraction of complex mixtures, using silica gel impregnated with palladium chloride.

76 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the mechanical properties of epoxy-based nanocomposites reinforced with spherical nanoparticles and found that the in-plane shear strength increases with the increment of particulate inclusions.
Abstract: The research is aimed to investigate the mechanical behaviors of epoxy-based nanocomposites reinforced with spherical nanoparticles. Five differ- ent contents of silica nanoparticles 5, 10, 15, 20, and 40 wt% were introduced in the samples. Through a solgel technique, the silica particles with a diameter of 25 nm were exfoliated uniformly in the epoxy matrix. Experimental results obtained from tensile tests indicate that the modulus of nanocomposites increases with the increment of particulate inclusions, and the enhancing behavior is coincided with the model predictions obtained from the MoriTanaka micromechanical model. In addition, the fracture tests conducted on single-edge-notch bending specimens reveal that the inclusion of nanoparticles can effectively increase the fracture tough- ness of the nanocomposites. Furthermore, the extent of the enhancement is more appreciable in the brittle matrix system rather than in the ductile matrix system. Subsequently, by inserting the silica epoxy mixture into the unidirectional glass fiber through a vacuum hand lay-up process, the glass fiber/silica/epoxy composite samples were fabricated. Results depicted that the in-plane shear strength increases until the increment of particle loadings are up to 10 wt%. In addition, results obtained from the compression tests revealed that the glass/epoxy specimens with 20 wt% silica loading exhibit superior compressive strengths than those that do not contain any silica particles.

76 citations

Journal ArticleDOI
TL;DR: In this paper, a simple and economical approach for the synthesis of pure SiO2 nanoparticles from rice husk was developed for the removal of ciprofloxacin (CIP) drug from aqueous solutions.

76 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023140
2022274
2021224
2020426
2019772
2018828