Naslov
Structural characterization, electrical and photocatalytic properties of α−and γ-Fe2O3 nanoparticles dispersed in iron aluminosilicate glass

Autori
Khan, Irfan ; Kuzmann, Erno ; Nomura, Kiyoshi ; Ali, Ahmad S. ; Akiyama, Kazuhiko ; Homonnay, Zoltan ; Sinko, Katalin ; Pavić, Luka ; Kubuki, Shiro

Izvornik
Journal of non-crystalline solids (0022-3093) 561 (2021); 120756, 11

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Sol-gel process ; Alumina doping ; α-Fe2O3/γ-Fe2O3 ; Nanoparticles ; Photocatalytic properties ; Electrical conductivity

Sažetak
The glass samples with the composition of 40Fe2O3-xAl2O3-(60−x)SiO2 were prepared by sol-gel method. The samples were characterized by XRD, 80 K 57Fe Mössbauer spectroscopy, TEM, FTIR and impedance spectroscopy. In the glass samples with less than 10% alumina, fayalite and hematite were crystallized by addition of hercynite. Whereas nanoparticles of hematite (α-Fe2O3) and maghemite (γ-Fe2O3) doped with Al were confirmed with the increase of alumina contents (15% and 20%). The glass samples exhibit the electronic conduction which is explained by the polaronic conduction mechanism. It is noticed that the catalysts containing a mixture of hematite and maghemite nanoparticles showed higher photocatalytic degradation of Rhodamine B dye than those containing hematite alone. It is suggested from the characterizations of newly developed iron-containing aluminosilicate glass samples that the materials with several bandgaps and without dissolving itself should be developed in the future for water purification under visible light irradiation.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA