Preparation of TiO2 loaded with crystalline nano Ag by a one-step low-temperature hydrothermal method

Abstract

TiO 2 loaded with crystalline nano silver (c-Ag/TiO 2 ) was successfully synthesized by a one-step low-temperature hydrothermal method in aqueous solution using tetra-n-butyl titanate and AgNO 3 as precursors. The structure and morphology were characterized by Auger electron spectroscopy (AES), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-Vis absorption spectra (UV-Vis) and fluorescence spectra (FS). The photocatalytic activity was tested with photocatalytic degradation of hydrogen sulfide (H 2 S) gas. The results show that the nano silver particles of Ag/TiO 2 prepared by the one-step lowtemperature hydrothermal method are crystalline, while they are amorphous when prepared by the conventional UV reduction deposition method (a-Ag/TiO 2 ). The photocatalytic activity of the c-Ag/TiO 2 prepared by the hydrothermal method was found to have a significant improvement for H 2 S degradation, being more than 2 times over that of the a-Ag/TiO 2 prepared by the conventional method.

Versatile and Amplified Biosensing through Enzymatic Cascade Reaction by Coupling Alkaline Phosphatase in Situ Generation of Photoresponsive Nanozyme

“…The SEM and TEM images ( Figure S1, Supporting Information) show the morphology and size distribution of the TiO 2 NPs synthesized according to a previously modified report, 24 which indicate that they are spherical in shape with an average size of about 3−5 nm. The XRD pattern confirms the tetragonal anatase structure of TiO 2 (JCPDS no.…”

Optical Properties of Hybrid Organic‐Inorganic Materials and their Applications

“…In the case of composite materials, basically two approaches can be found, either in situ synthesis of metal nanostructures in the matrix using chemical, thermal or photoinduced reductions; or incorporation of nanoparticles colloidal dispersions during the matrix preparation. The matrix can typically be inorganic, [496][497][498][499] sol-gel based matrix [215,[500][501][502][503][504][505][506][507][508][509][510] or polymers. [511][512][513][514] Regarding the in situ growth, the main drawbacks are the limitations in terms of control of the shape of the particles, which are often spherical or wire-type structures and the homogeneity in size and dispersion.…”

Facile in-situ photocatalysis of Ag/Bi2WO6 heterostructure with obviously enhanced performance

“…It is well established that the recombination of carriers in a semiconductor must be prevented as much as possible to favor the photocatalyzed reactions. The freshly formed Ag can act as electron traps to facilitate the separation and migration of photogenerated electron-hole pairs as well as the dye injected electrons due to the high Schottky barriers at Ag-Bi 2 WO 6 interface [22,47]. PL spectra have confirmed the significantly inhibited recombination of photogenerated carriers.…”