利用铁和生物油废料制备用于光芬顿反应的高度分散的Fe/C复合材料。
Use of iron and bio-oil wastes to produce highly dispersed Fe/C composites for the photo-Fenton reaction.
作者信息
de Mendonça Fernanda Gomes, Rosmaninho Marcelo Gonçalves, da Fonseca Philipe Xavier, Soares Ricardo Reis, Ardisson José Domingos, Tristão Juliana Cristina, Lago Rochel Montero
机构信息
Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
Departamento de Química, Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil.
出版信息
Environ Sci Pollut Res Int. 2017 Mar;24(7):6151-6156. doi: 10.1007/s11356-016-6480-0. Epub 2016 Apr 7.
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 L) and organic concentration (25 wt.%) obtained from biomass flash pyrolysis was used for the efficient extraction of Fe from laterite waste. After extraction, the mixture Fe/AAF was dried and treated at different temperatures, i.e., 500, 650, and 800 °C, to obtain Fe/C reactive composites. Mössbauer, XRD, TG, elemental analyses, and SEM/EDS showed the presence of highly disperse Fe oxide nanoparticles at 500 and 650 °C and Fe particles in the material obtained at 800 °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.
本工作描述了一种活性多相光芬顿体系的合成、表征及应用，该体系由两种不同的废弃物制得，即红土（一种铁矿开采废弃物）和生物油生产过程中的酸性水相馏分（AAF）。从生物质快速热解获得的具有高酸度（约3 mol·L）和有机浓度（25 wt.%）的AAF用于从红土废弃物中高效提取铁。提取后，将铁/AAF混合物干燥并在不同温度（即500、650和800℃）下处理，以获得铁/碳反应性复合材料。穆斯堡尔谱、X射线衍射、热重分析、元素分析以及扫描电子显微镜/能谱分析表明，在500和650℃时存在高度分散的氧化铁纳米颗粒，在800℃获得的材料中存在铁颗粒，碳含量在74%至80%之间变化。这三种复合材料作为多相催化剂用于光芬顿反应中对模型染料污染物亚甲基蓝进行氧化，在中性pH条件下表现出高活性。
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