@misc{10481/86680,
year = {2016},
url = {https://hdl.handle.net/10481/86680},
abstract = {BACKGROUND. This paper reports the use of novel coupled LaCoO3-TiO2 as photocatalyst with double route of peroxymonosulfate (PMS) activation. First, as a photocatalyst due to titania; and second, through PMS heterogeneous decomposition onto LaCoO3 particles. Thus, photocatalytical activity was tested for removing a mixture of four herbicides of different recalcitrance (metazachlor, tembotrione, tritosulfuron and ethofumesate). RESULTS. The presence of light and PMS highly enhanced herbicides removal rate: 3.5–5 times increases were obtained with UVA light. Oxidant concentration, catalyst load, pH and temperature were assessed. Herbicides were completely oxidized depending on their recalcitrant nature and the operational variables. 55% TOC conversion was reached using Oxone® 5 × 10−4 mol L−1. Phytotoxicity assays denoted no inhibition after 180 min of photocatalytic treatment (∼80% initial inhibition). Solid properties of Co/Ti = 0.1:1 ratio were studied by means of SEM (LaCoO3 aggregates linked to a variety of shapes and sizes of TiO2), XRF (6.1% of LaCoO3), XPS (superficial Co3+, La3+ and Ti4+), XRD (anatase, rutile and rhombohedral LaCoO3) and UV–vis diffuse reflectance (visible range absorption and bandgap of 2.88 eV for TiO2). CONCLUSION. Catalysts based on LaCoO3-TiO2 combined with peroxymonosulfate seem to be suitable for removing organic pollutants, with a moderate conversion of TOC and elimination of toxicity.},
organization = {Junta de Extremadura  GR15033},
organization = {CICYT of Spain CTQ2015/64944-R},
organization = {FEDER founds},
organization = {Gobierno de Extremadura},
organization = {FSE Funds  (PD12058)},
organization = {University of Extremadura},
organization = {Junta de
Extremadura},
organization = {MICINN},
organization = {FSE},
keywords = {Photocatalysis},
keywords = {Advanced oxidation},
keywords = {Environmental remediation},
keywords = {Heterogeneous catalysis},
keywords = {Decontamination},
title = {Synergism between peroxymonosulfate and LaCoO3-TiO2 photocatalysis for oxidation of herbicides. Operational variables and catalyst characterization assessment},
doi = {10.1002/jctb.5228},
author = {Rodríguez Solís, Rafael and Rivas, F. Javier and Gimeno, Olga and Pérez Bote, José Luis},
}