RT journal article
T1 Graphene oxide/titania photocatalytic ozonation of primidone in a visible LED photoreactor
A1 Checa, Manuel
A1 Figueredo Fernández, Manuel Alfredo
A1 Aguinaco Martín, Almudena
A1 Beltrán, Fernando J.
A2 Física de la Materia Condensada
AB A graphene oxide-titania (GO/TiO2) composite was synthesized via sol-gel method, andstudied in aqueous Primidone mineralization with ozone and LED visible light. Thephotocatalyst was characterized by different techniques (XRD, TEM, SBET, TGA,UV–vis diffuse reflectance spectroscopy). The band gap value decrease from 3.14 eVfor bare TiO2 samples to 2.5 eV in GO/TiO2 composites clearly shows the interaction ofGO with TiO2 structure. Approximately 20 mg L-1 of Primidone was removed in lessthan 20 min if ozone was applied, regardless of the presence or absence of light andcatalyst. However, reactivity tests show a synergism effect between photocatalysis andozonation for mineralization purposes. The combination of ozone and GO improved theactivation of TiO2 under visible light. Process optimization led us to select a catalystdosage of 0.25 g L-1, a light radiance of 359 W m-2 and a GO loading in the catalystaround 0.75%. At these conditions, with photocatalytic ozonation, the presence of GOin the catalyst improved mineralization up to 82% in 2 h compared to 70% reached withbare TiO2. Catalyst reusability shows no decrease of photocatalytic activity. Scavengertests point to hydroxyl radicals as the main species responsible for Primidone removal.
PB Elsevier
SN 1873-3336
YR 2019
FD 2019-02-10
LK http://hdl.handle.net/10498/34589
UL http://hdl.handle.net/10498/34589
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 21-sep-2026