Synthesis, Characterization and Photocatalytic Behavior of SiO₂@nitrized‐TiO₂ Nanocomposites Obtained by a Straightforward Novel Approach

Abstract

We report on the facile synthesis of SiO 2 @nitrized‐TiO 2 nanocomposite (NST) by calcination of TiO 2 xerogel with OctaAmmonium POSS® (N‐POSS; POSS=polyhedral oligomeric silsesquioxanes). The as‐obtained nanoporous mixed oxide is constituted by uniformly distributed SiO 2 and nitrized‐TiO 2 , where the silica component is present in an amorphous state and TiO 2 in an anatase/rutile mixed phase (92.1 % vs. 7.9 %, respectively) with very small anatase crystallites (3.7 nm). The TiO 2 lattice is nitrized both at interstitial and substitutional positions. NST features a negatively charged surface with a remarkable surface area (406 m 2 g −1 ), endowed with special adsorption capabilities towards cationic dyes. Its photocatalytic behavior was tested by following the degradation of standard aqueous methylene blue and methyl orange solutions under UV and visible light irradiation, according to ISO 10678:2010. For comparison, analogous investigations were carried out on a silica‐free N−TiO 2 , obtained by using NH 4 Cl as nitrogen source.

Chemical and Morphological Modifications Induced by Argon Plasma Treatments on Fluorinated Polybenzoxazole Films

“…35 The chemical modifications occurring in the F-PHA films during the thermal curing process were also monitored using FT-IR analysis. 37,38 Figure 3A shows the FT-IR spectrum of the F-PHA polymer precursor film before the thermal curing process, measured in the 900−1800 cm −1 range. In particular, this FT-IR spectrum shows the characteristic absorption peaks of the fluorinated poly-hydroxy-amide precursor at 965 cm −1 (C−H bending), 990 cm −1 (C�C bending), 1035 cm −1 (C− O−H stretching), 1150−1250 cm −1 (C−F stretching), 1435 cm −1 (C−O−H bending), 1495 cm −1 (C−F bending), 1540 cm −1 (amide I stretching), 1600 cm −1 (aromatic C�C stretching), 1650 cm −1 (amide II stretching), and 1760 cm −1 (C�O stretching).…”

Semi-Continuous Heterophase Polymerization to Synthesize Poly(methacrylic acid)-Based Nanocomposites for Drug Delivery

“…For the versatile fields in which FT-IR technique can be applied, because of their sensitivity, simplicity, and easy calibration, FT-IR is a highly appreciated technique [ 43 ]. Between their fields of application, their capacity to analyze nanomaterials as the nanocomposites is noteworthy [ 44 ]. In this respect, the purpose of analyzing nanomaterials by FT-IR spectroscopy is to detect their functional groups; in the case of surface-modified nanomaterials, this is particularly useful in order to verify if a particular chemical route of modification was carried out successfully.…”

Recent Progress in Visualization and Analysis of Fingerprint Level 3 Features

“…With the implementation of nanotechnology over recent years, fingerprint enhancement especially for the third-level details has taken a step forward owing to the excellent physical and electronic properties of various nanomaterials. [42][43][44] Particularly, quantum dots (QDs) with good performance have been reported to allow LFP imaging with high contrast. [45,46] In the year 2017, Wu et al utilized red-emitting N-acetylcysteine-capped CdTe QDs (NÀ L-Cys-capped CdTe QDs) reagent to visualize eccrine LFPs.…”