Solid‐state immobilisation of titanium dioxide nanoparticles onto nanoclay

Abstract

The impregnation of nanoclay with TiO 2 was carried out by new and fast method. Nanoclay was submitted only to a single step molten salt process. Scanning electron microscopy showed that TiO 2 nanoparticles precipitated over the nanoclay surface after treatment. Structural characterisation of nanocomposite by X-ray diffraction displayed the change of basal peak after even 1 min process at both temperatures. UV-visible spectroscopy showed the presence of TiO 2. However, the band gap was not affected by process temperature and time. XRF graphs revealed that by increasing temperature and time of the molten salt process, the amount of loaded titanium dioxide on the nanoclays was enhanced. Through this quick process, an inexpensive nanocomposite with properties comparable with those from more elaborate processes is produced.

Antibacterial and photocatalytic activity of anatase phase Ag‐doped TiO 2 nanoparticles

“…Ag‐doped TiO 2 powders were produced by the modified synthetic procedure of Ghorbanpour and Lotfiman [5]. Appropriate amounts of AgNO 3 (Merck)and TiO 2 (Merck), i.e.…”

“…The major problems against the practical application of TiO 2 photocatalyst are its low quantum efficiency and short wavelength excitation [5, 6]. When TiO 2 particles are irradiated with near ultraviolet (UV) light with an energy equal to or larger than the bandgap energy ( λ < 380 nm), electrons from the valence band migrate to the conduction band and create positively charged holes on the valence band.…”

“…In this method, the initial mixing of the particles and enhanced (liquid state) diffusion occurs, which speeds up the establishment of the product structure [14]. Recently, several studies have been carried out on the synthesis of metal–oxide/substrate nanocomposites by molten‐salt method [5, 12, 15, 16]. Nevertheless, as far as this research was concerned, there was no report on the preparation of TiO 2 and Ag‐doped TiO 2 nanoparticles by the molten‐salt method.…”

“…This Letter introduced a novel one-step and easy approach for the synthesis of Ag-doped TiO 2 nanoparticles. The simplest approach involved the formation of Ag-doped TiO 2 nanoparticles with anatase phase by calcination of a mixture of Ag and TiO 2 powder at 700°C for 1 h. Ag-doped TiO 2 powders were produced by the modified synthetic procedure of Ghorbanpour and Lotfiman [5]. Appropriate amounts of AgNO 3 (Merck)and TiO 2 (Merck), i.e.…”

Soybean Oil Bleaching by Adsorption onto Bentonite/Iron Oxide Nanocomposites

“…The bleaching of edible vegetable oils involves removal of a variety of impurities, which include phosphatides, fatty acids, gums and trace metals, etc., followed by decolourisation. 1,2 In refinery processing of vegetable oils, adsorbents are used to remove carotene, chlorophyll and other components formed during the refining process. Common adsorbents are hydrated aluminium silicates, commonly known as bleaching clays.…”