Naslov
Thermal evolution, properties and photocatalytic activity of sol-gel derived nanocrystalline anatase

Autori
Lozić, Iva ; Mandić, Vilko ; Kurajica, Stanislav

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts of ChemCYS 2014 / Vranken, Thomas ; Damm, Hanne - Blankenberge, 2014, 206-206

Skup
Chemistry Conference for Young Scientists 2014

Mjesto i datum
Blankenberge, Belgija, 27.02.2014. - 28.02.2014

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
thermal evolution; sol-gel; nanocrystalline anatase; photocatalytic activity
(termička evolucija; sol-gel; nanokristaliničan anatas; fotokatalitička aktivnost)

Sažetak
Amorphous titania gel has been prepared using sol- gel process by slow hydrolysis of titanium n- butoxide. The prepared gel has been investigated using Fourier-Transformed Infra-red Spectroscopy (FTIR), Powder X-ray diffraction (PXRD), Differential Thermal Analysis (DTA) and Thermo- gravimetric analysis (TGA). According to XRD scan the prepared gel has been amorphous. FTIR spectrum revealed the presence of butoxy groups pointing out to a partial hydrolysis of the precursor. The decomposition of an amorphous precursor and titania structural evolution with the temperature was studied. The DTA trace has been characterized with four peaks, one endothermal, centered at 127 °C, and three exothermal peaks, centered at 144, 362 and 608 °C. The first three peaks were accompanied by mass loss, observed by TGA. The first peak has been attributed to the removal of water and organics, second to the decomposition of partially hydrolyzed butoxide, third to anatase crystallization and fourth to transformation of anatase to rutile. Judging by the continuous mass loss, the prepared powder seems to retain a considerable amount of organics in the solid phase, even at high temperature. Thermal treatment of prepared gel at temperatures as low as 350 °C yielded with nano-crystalline anatase. At higher temperatures, transformation of anatase into rutile phase has been observed. The prepared material was characterized by means of XRD, SEM and N2 adsorption. It has been determined that crystallite size of anatase obtained by thermal treatment at 350 °C for 2 h was 13.2 nm, while surface area calculated by the BET equation was 65.48 m2g-1. SEM micrograph of sample thermally treated at 350°C for 2 h revealed that it consist of aggregated iregular grains.The photocatalytic activity of the obtained anatase was investigated using C.I. Reactive Violet 2 as a model pollutant. A satisfactory photocatalytic activity of the prepared material has been noted.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA