Novel TiO2 prepared from titanyl sulphate by using pressurized water processing and its photocatalytic activity evaluation

Autor: Tereza Brunátová, Lukáš Polách, Marcel Šihor, Martin Reli, Stanislav Daniš, Jaroslav Lang, Kamila Kočí, Ivana Troppová, Pavlína Peikertová, Lenka Matějová
Rok vydání: 2017
Předmět:
Zdroj: Materials Research Bulletin. 95:30-46
ISSN: 0025-5408
DOI: 10.1016/j.materresbull.2017.07.010
Popis: TiO 2 anatase was prepared by a novel preparation approach, combining utilization of titanyl sulphate as a precursor and pressurized water processing. In addition, two different chemical methods for preparation were used – thermal hydrolysis and induced hydrolysis. The photoactivity of developed TiO 2 was examined in two environmentally-prospective reactions: azo-dye AO7 photodiscoloration (oxidation) and N 2 O photodecomposition (reduction). It was revealed that during the processing the temperature has a crucial effect on TiO 2 crystallization contrary to pressure. TiO 2 anatase of smaller crystallite-size showed significantly higher photoactivity in AO7 photodiscoloration than TiO 2 anatase of large crystallite-size. However, in N 2 O photodecomposition all synthesized materials showed comparable activity. While the TiO 2 anatase crystallite-size and surface area are the determining properties in azo-dye AO7 photodiscoloration, the electronic band structure and recombination rate of electron and holes are determining in N 2 O photodecomposition. The correlation enabling the estimation of TiO 2 anatase crystallite-size from Raman FWHMs was found as well.
Databáze: OpenAIRE
Externí odkaz: