期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 369, 期 -, 页码 70-78出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.02.025
关键词
Photocatalytic ozonation; Primidone mineralization; Graphene oxide; Titania; Visible LED
资金
- Ministery of Economy and Competitiveness of Spain
- European Funds [CTQ2015/64944R]
- Ministerio de Economia y Competitividad of Spain [217, BES-2016-078456]
A graphene oxide-titania (GO/TiO2) composite was synthesized via sol-gel method, and studied in aqueous Primidone mineralization with ozone and LED visible light. The photocatalyst was characterized by different techniques (XRD, TEM, SBET, TGA, UV-vis diffuse reflectance spectroscopy). The band gap value decrease from 3.14 eV for bare TiO2 samples to 2.5 eV in GO/TiO2 composites clearly shows the interaction of GO with TiO2 structure. Approximately 20 mg L-1 of Primidone was removed in less than 20 min if ozone was applied, regardless of the presence or absence of light and catalyst. However, reactivity tests show a synergism effect between photocatalysis and ozonation for mineralization purposes. The combination of ozone and GO improved the activation of TiO2 under visible light. Process optimization led us to select a catalyst dosage of 0.25 g L-1, a light radiance of 359 m(-2) and a GO loading in the catalyst around 0.75%. At these conditions, with photo catalytic ozonation, the presence of GO in the catalyst improved mineralization up to 82% in 2 h compared to 70% reached with bare TiO2. Catalyst reusability shows no decrease of photocatalytic activity. Scavenger tests point to hydroxyl radicals as the main species responsible for Primidone removal.
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