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Papers by Raquel Nogueira

Portugaliae Electrochimica Acta, 2003

Quimica Nova, 2005

In this work the application of the photo-Fenton process for the treatment of washing water of he... more In this work the application of the photo-Fenton process for the treatment of washing water of herbicide containers using solar energy was studied. The influence of the H2O2 concentration and the iron source on the degradation of tebuthiuron and diuron was ...

Eclética Química, 2004

Page 1. 19 Ecl. Quím., São Paulo, 29(2): 19-26, 2004 Volume 29, número 2, 2004 www.scielo.br/eq E... more Page 1. 19 Ecl. Quím., São Paulo, 29(2): 19-26, 2004 Volume 29, número 2, 2004 www.scielo.br/eq Estudo da aplicação do processo foto-Fenton solar na degradação de efluentes de indústria de tintas MRA da Silva*, MC de Oliveira*, RFP Nogueira* ...

Solar Energy, 1996

A photocatalytic reactor using immobilized TiO2 (Degussa P25) on a glass plate was studied on a b... more A photocatalytic reactor using immobilized TiO2 (Degussa P25) on a glass plate was studied on a bench scale using solar light as the source of radiation. The influence of parameters such as the slope of the plate, solar light intensity, flow rate and molar flow rate, as well as the geometry of the reactor, was studied using dichloroacetic acid (DCA)

African Health Sciences, 2014

Eclética Química, 2002

Eclética química Universidade Estadual Paulista Júlio de Mesquita Filho atadorno@iq.unesp. br ISS... more Eclética química Universidade Estadual Paulista Júlio de Mesquita Filho atadorno@iq.unesp. br ISSN (Versión impresa): 0100-4670 ISSN (Versión en línea): 1678-4618 BRASIL 2002 RaquelFernandes Pupo Nogueira / Daniela Fonseca Modé FOTODEGRADAÇÃO DE ...

Química Nova, 2009

... 1 Diante dessa conjuntura, temas como reuso, minimização e tratamento de resíduos vêm ganhand... more ... 1 Diante dessa conjuntura, temas como reuso, minimização e tratamento de resíduos vêm ganhando cada vez mais importância. ... É importante salientar que no Brasil há uma maior expectativa de ocorrência de fármacos em águas residuais como conseqüência da carência ...

Water Research, 2009

In this work, the photocatalytic degradation of the antibiotic sulfamethoxazole (SMX) by solar ph... more In this work, the photocatalytic degradation of the antibiotic sulfamethoxazole (SMX) by solar photo-Fenton at pilot plant scale was evaluated in distilled water (DW) and in seawater (SW). Degradation and mineralization of SMX were strongly hindered in SW compared to DW. The influence of H(2)O(2) and iron concentration on the efficiency of the photocatalytic process was evaluated. An increase in iron concentration from 2.6 to 10.4 mg L(-1) showed only a slight improvement in SMX degradation and mineralization. However, an increase in H(2)O(2) concentration up to 120 mg L(-1) during photo-Fenton in DW decreased SMX solution toxicity from 85% to 20%, according to results of Daphnia magna bioassays. The same behaviour was not observed after photo-Fenton treatment in SW. Despite 45% mineralization in SW, toxicity increased from 16% to 86% as shown by Vibrio fischeri bioassays, which suggests that the intermediates generated in SW are different from those in DW. A SMX degradation pathway during the photo-Fenton treatment in DW is proposed.

Water Research, 2011

The influence of iron species on amoxicillin (AMX) degradation, intermediate products generated a... more The influence of iron species on amoxicillin (AMX) degradation, intermediate products generated and toxicity during the photo-Fenton process using a solar simulator were evaluated in this work. The AMX degradation was favored in the presence of the potassium ferrioxalate complex (FeOx) when compared to FeSO(4). Total oxidation of AMX in the presence of FeOx was obtained after 5 min, while 15 min were necessary using FeSO(4). The results obtained with Daphnia magna biossays showed that the toxicity decreased from 65 to 5% after 90 min of irradiation in the presence of FeSO(4). However, it increased again to a maximum of 100% after 150 min, what indicates the generation of more toxic intermediates than AMX, reaching 45% after 240 min. However, using FeOx, the inhibition of mobility varied between 100 and 70% during treatment, probably due to the presence of oxalate, which is toxic to the neonates. After 240 min, between 73 and 81% TOC removal was observed. Different pathways of AMX degradation were suggested including the opening of the four-membered β-lactamic ring and further oxidations of the methyl group to aldehyde and/or hydroxylation of the benzoic ring, generating other intermediates after bound cleavage between different atoms and further oxidation to carboxylates such acetate, oxalate and propionate, besides the generation of nitrate and ammonium.

Water Research, 2010

The complexation of iron ions with the herbicide tebuthiuron (TBH), during a solar photo-Fenton p... more The complexation of iron ions with the herbicide tebuthiuron (TBH), during a solar photo-Fenton process, was investigated using cyclic voltammetry with a glassy carbon electrode. An oxidation peak was observed at +0.64 V after addition of Fe(NO(3))(3) to TBH solution, indicating the formation of a Fe-TBH complex, which was not observed in the presence of ferrioxalate or citrate complexes. This complexation hinders photoreduction of Fe(III), and consequently TBH degradation. The main degradation route, in the presence or absence of citric acid (in the latter case with Fe(NO(3))(3) only), is initiated by the hydroxylation of a terminal methyl group of the urea, indicating an identical degradation mechanism. Hydroxylation of the central methyl of urea, and of the tert-butyl group, was also observed after extended irradiation periods in the presence of citric acid, but was not observed in the presence of Fe(NO(3))(3), due to a slower degradation rate in the absence of the citrate complex. No intermediate, generated from opening of the thiadiazole ring, was identified under the various different conditions.

Science of The Total Environment, 2006

The degradation of DDT [1,1-bis(4-chlorophenyl)-2,2,2-trichloroethane] and DDE [2,2-bis(4-chlorop... more The degradation of DDT [1,1-bis(4-chlorophenyl)-2,2,2-trichloroethane] and DDE [2,2-bis(4-chlorophenyl)-1,1-dichloroethylene] in highly and long-term contaminated soil using Fenton reaction in a slurry system is studied in this work. The influence of the amount of soluble iron added to the slurry versus the mineral iron originally present in the soil, and the influence of H(2)O(2) concentration on the degradation process are evaluated. The main iron mineral species encountered in the soil, hematite (Fe(2)O(3)), did not show catalytic activity in the decomposition of H(2)O(2), resulting in low degradation of DDT (24%) and DDE (4%) after 6 h. The addition of soluble iron (3.0 mmol L(-1)) improves the reaction reaching 53% degradation of DDT and 46% of DDE. The increase in iron concentration from 3.0 to 24 mmol L(-1) improves slightly the degradation rate of the contaminants. However, similar degradation percentages were obtained after 24 h of reaction. It was observed that low concentrations of H(2)O(2) were sufficient to degrade around 50% of the DDT and DDE present in the soil, while higher degradation percentages were achieved only with high amounts of this reagent (1.1 mol L(-1)).

Química Nova, 2007

Page 1. Quim. Nova, Vol. 30, No. 8, 1799-1803, 2007 Artigo *e-mail: nogueira@iq.unesp. br POTENCI... more Page 1. Quim. Nova, Vol. 30, No. 8, 1799-1803, 2007 Artigo *e-mail: nogueira@iq.unesp. br POTENCIAL DE APLICAÇÃO DO PROCESSO FOTO-FENTON/SOLAR COMO PRÉ-TRATAMENTO DE EFLUENTE DA INDÚSTRIA DE LATICÍNIOS ...