Use of iron and bio-oil wastes to produce highly dispersed Fe/C composites for the photo-Fenton reaction

作者：de Mendonca Fernanda Gomes; Rosmaninho Marcelo Goncalves; da Fonseca Philipe Xavier; Soares Ricardo Reis; Ardisson Jose Domingos; Tristao Juliana Cristina; Lago Rochel Montero^*

来源：Environmental Science and Pollution Research, 2017, 24(7): 6151-6156.

DOI：10.1007/s11356-016-6480-0

• Photo-Fenton
• Laterite
• Bio-oil
• Acid aqueous fraction
• Fe/C composites

This work describes the synthesis, characterization, and application of an active heterogeneous photo-Fenton system obtained from two different wastes, i.e., laterite (an iron mining waste) and the acid aqueous fraction (AAF) from bio-oil production. AAF with high acidity (ca. 3 mol(H+)L(-1)) and organic concentration (25 wt.%) obtained from biomass flash pyrolysis was used for the efficient extraction of Fe3+ from laterite waste. After extraction, the mixture Fe3+/AAF was dried and treated at different temperatures, i.e., 500, 650, and 800 degrees C, to obtain Fe/C reactive composites. Mssbauer, XRD, TG, elemental analyses, and SEM/EDS showed the presence of highly disperse Fe oxide nanoparticles at 500 and 650 degrees C and Fe-0 particles in the material obtained at 800 degrees C with carbon contents varying from 74 to 80 %. The three composites were tested as heterogeneous catalysts in the photo-Fenton reaction for the oxidation of the model dye contaminant methylene blue, showing high activities at neutral pH.

• 出版日期2017-3