Navegando por Autor "Aguiar, Leandro G."
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Artigo A comparative study of persulfate activation by iron-modified diatomite and traditional processes for the treatment of 17α-ethinylestradiol in water(Environmental Technology, 2020-03-05) Chiavone Filho, Osvaldo; Silva, Celyna Káritas Oliveira da; Silva, Silvia S. O.; Souza, Alessandra R.; Aguiar, Leandro G.; Silva, Dannielle J.; Vianna, Marilda M. G. R.; Nascimento, Cláudio Augusto Oller doEmerging pollutants have been the subject of worldwide study because their continuous entry into the environment presents a risk to ecosystems and human health. Advanced oxidation processes show promise for eliminating or reducing the concentrations of emerging pollutants in water. This study aimed to investigate the treatment of aqueous systems containing the synthetic hormone 17α-ethinylestradiol. An innovative method for persulfate activation catalysed by ironmodified diatomite (heterogeneous system) was compared to conventional homogeneous activation methods (iron activation, alkaline activation, and heat activation). Iron-modified diatomite was more efficient in activating persulfate than traditional processes, achieving 98% of pollutant removal. Experimental results indicated that the catalyst can be reused without loss of removal efficiency, with potential environmental and economic benefitsArtigo Remediation of phenanthrene-contaminated soil by persulfate activated with Fe-Modified diatomite: kinetic and statistical approaches(Springer Nature, 2017-07-10) Chiavone Filho, Osvaldo; Rackov, Celyna Káritas Oliveira da; Aguiar, Leandro G.; Souza, Alessandra R.; Silva, Silvia S. O.; Câmara, Alan G.; Vianna, Marilda M. G. R.; Foletto, Edson Luiz; Nascimento, Cláudio Augusto Oller doAn innovative diatomite-supported iron catalyst has been developed by using an impregnation process with a mixture of ferrous (Fe2+) and ferric (Fe3+) ions in the form of precipitated iron hydroxides. Raw and modified diatomite samples have been characterized by X-ray fluorescence and scanning electron microscopy. The main characterization results have revealed that modified diatomites are amorphous and have higher iron concentrations than raw diatomite. The results also indicate that the modified materials provided significant catalytic activity on phenanthrene degradation by using sodium persulfate. Satisfactory results were obtained with 45 g/L of sodium persulfate and 1 g of modified diatomite, thus degrading 98% of phenanthrene during 168 h of treatment. Kinetic and statistical approaches were developed for the remediation process herein, which have been validated with experimental data, thence yielding suitable results