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Silva LSR, Melo IG, Almeida CVS, Meneses CT, Eguiluz KIB, Salazar-Banda GR. The Effect of Pt Loading on Catalytic Activity of Pb 0.25@Pt x/C Nanocomposites Toward Ethanol Oxidation. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2020; 20:878-889. [PMID: 31383083 DOI: 10.1166/jnn.2020.16919] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Here, we study the influence of the Pt loading and the particle size of Pb0.25@Ptx/C catalysts on their specific activity toward ethanol oxidation in acid media. High angle annular dark field-scanning transmission electron microscopy and electron energy loss spectroscopy data indicate the formation of Pb0.25@Ptx/C core-shell structures, which are well dispersed on carbon support, with spherical shapes and small particle sizes (2.9-6.6 nm). Cyclic voltammetry experiments confirm characteristic profiles of polycrystalline Pt for Pb0.25@Ptx/C structures. The specific activity of the catalysts toward ethanol oxidation reaction greatly depends on the Pt content on Pb core, and consequently, depends on the size of the nanoparticles. The optimum activity occurs with the lowest Pt load in the shell and smaller particle size. Enhancements in specific activity result from the higher number of nanoparticles available for the ethanol oxidation reaction and the tensile strain effect of Pt atoms on the surface expanded in Pb0.25@Pt0.75/C. The lower activity observed for the catalysts with loads of 35 and 50% wt. (Pb0.25@Pt1.5 and Pb0.25@Pt2.25/C, respectively) in comparison to Pt/C, could be explain by the larger particle sizes obtained at these catalysts. Moreover, the Pb0.25@Pt0.75/C catalyst has high electrochemical stability and should be more stable in direct ethanol fuel cells systems than monolithic Pt catalysts. This is because the Pt shell in Pb0.25@Pt0.75/C exhibits lower chemical potential (p < 0) than at Pt/C and at the other core-shell catalysts studied; thus, reducing its tendency to dissolve. The developed core-shell nanostructure is thus a potential candidate as high-performance anode catalyst for application in direct ethanol fuel cells.
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de O S Santos G, Vasconcelos VM, da Silva RS, Rodrigo MA, Eguiluz KI, Salazar-Banda GR. New laser-based method for the synthesis of stable and active Ti/SnO2–Sb anodes. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2019.135478] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ferreira HS, Ferreira HS, Gliech M, Bergmann A, Beermann V, Rangel MDC, Eguiluz KIB, Salazar-Banda GR. Synthesis of Ni-SiO₂/C Supported Platinum Catalysts for Improved Electrochemical Activity Towards Ethanol Oxidation. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2019; 19:4590-4598. [PMID: 30913753 DOI: 10.1166/jnn.2019.16915] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A series of Pt/Ni-SiO₂/C catalysts with different mass proportions of Ni-SiO₂/C (0:100, 30:70, 50:50, 70:30 and 100:0) were prepared and studied towards ethanol electrochemical oxidation in acid medium. The support silica particles were initially synthesized via sol-gel and then modified with NiCl2. The Ni deposited on the silica surface plays a role promoting nucleation sites for the reduction of platinum. Pt was further chemically reduced onto Ni-SiO₂ using formic acid and loaded onto carbon Vulcan XC-72 R. The Pt/Ni-SiO₂/C catalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, temperature-programmed reduction, X-ray photoelectron spectroscopy, transmission electron microscopy and inductively coupled plasma-optical emission spectroscopy. The physical characterizations reveal the formation of oxide-metal composite and strong interaction between Pt and the Ni-SiO₂ composite. The Pt/Ni-SiO₂/C catalyst with meso/macroporous structure exhibits higher electrocatalytic activity towards ethanol oxidation and better stability, after 48 h of electrolysis, than a commercial Pt/C catalyst. These improved features could be due to presence of Ni-SiO₂ composite that promotes corrosion resistance of the support and prevents the aggregation of Pt nanoparticles and their detachment from the support. The low poisoning of the Pt/Ni-SiO₂/C catalyst is probably due to the enhanced oxygen content on the composite surface. The high electrocatalytic activity and enhanced electrochemical stability of the Pt/Ni-SiO₂/C catalyst make it promising for further fuel cell applications.
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Almeida GRO, López-Suárez FE, Silva LSR, Pereira GF, Bueno-López A, Eguiluz KIB, Salazar-Banda GR. Methanol Electro-Oxidation on Carbon-Supported PtRu Nanowires. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2019; 19:795-802. [PMID: 30360155 DOI: 10.1166/jnn.2019.15743] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
One of the key objectives in fuel cell technology is to improve the alcohol oxidation efficiency of Pt-based catalysts. A series of carbon-supported PtRu nanowires with different concentrations of Pt and Ru were prepared for application in methanol oxidation in acid media. The physicochemical properties and electrocatalytic activity of these catalysts during methanol oxidation are function on their structure, morphology and composition. A Pt60Ru40/C catalyst shows the best behaviour towards methanol electro-oxidation allowing decrease the onset potential approximately 0.2 V respect to others PtRu/C synthesised nanowires. The structural modification of Pt by Ru and synergetic character of RuPt are main factors that could contribute to reduction of energy necessary for electro-oxidation process. The Pt and PtRu nanowires have different sizes and distribution on the substrate. The average crystallite sizes, found by XRD, are in the 4.6-5.9 nm range and the lattice parameter is between 0.3903-0.3908 nm. Small differences with the values of the Pt/C catalyst were found. The XPS results show a prevailing presence of metallic Pt and Ru4+ species.
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Machado CF, Gomes MA, Silva RS, Salazar-Banda GR, Eguiluz KI. Time and calcination temperature influence on the electrocatalytic efficiency of Ti/SnO2:Sb(5%),Gd(2%) electrodes towards the electrochemical oxidation of naphthalene. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.03.053] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Viana DF, Salazar-Banda GR, Leite MS. Electrochemical degradation of Reactive Black 5 with surface response and artificial neural networks optimization models. SEP SCI TECHNOL 2018. [DOI: 10.1080/01496395.2018.1463264] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Vilar DS, Carvalho GO, Pupo MM, Aguiar MM, Torres NH, Américo JH, Cavalcanti EB, Eguiluz KI, Salazar-Banda GR, Leite MS, Ferreira LF. Vinasse degradation using Pleurotus sajor-caju in a combined biological – Electrochemical oxidation treatment. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2017.10.017] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Silva JRO, Santos DS, Santos UR, Eguiluz KIB, Salazar-Banda GR, Schneider JK, Krause LC, López JA, Hernández-Macedo ML. Electrochemical and/or microbiological treatment of pyrolysis wastewater. CHEMOSPHERE 2017; 185:145-151. [PMID: 28688848 DOI: 10.1016/j.chemosphere.2017.06.133] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 06/05/2017] [Accepted: 06/29/2017] [Indexed: 05/23/2023]
Abstract
Electrochemical oxidation may be used as treatment to decompose partially or completely organic pollutants (wastewater) from industrial processes such as pyrolysis. Pyrolysis is a thermochemical process used to obtain bio-oil from biomasses, generating a liquid waste rich in organic compounds including aldehydes and phenols, which can be submitted to biological and electrochemical treatments in order to minimize its environmental impact. Thus, electrochemical systems employing dimensionally stable anodes (DSAs) have been proposed to enable biodegradation processes in subsurface environments. In order to investigate the organic compound degradation from residual coconut pyrolysis wastewater, ternary DSAs containing ruthenium, iridium and cerium synthetized by the 'ionic liquid method' at different calcination temperatures (500, 550, 600 and 700 °C) for the pretreatment of these compounds, were developed in order to allow posterior degradation by Pseudomonas sp., Bacillus sp. or Acinetobacter sp. bacteria. The electrode synthesized applying 500 °C displayed the highest voltammetric charge and was used in the pretreatment of pyrolysis effluent prior to microbial treatment. Regarding biological treatment, the Pseudomonas sp. exhibited high furfural degradation in wastewater samples electrochemically pretreated at 2.0 V. On the other hand, the use of Acinetobacter efficiently degraded phenolic compounds such as phenol, 4-methylphenol, 2,5-methylphenol, 4-ethylphenol and 3,5-methylphenol in both wastewater samples, with and without electrochemical pretreatment. Overall, the results indicate that the combination of both processes used in this study is relevant for the treatment of pyrolysis wastewater.
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Ribeiro WF, da Costa DJE, Lourenço AS, de Medeiros EP, Salazar-Banda GR, do Nascimento VB, Araujo MCU. Adsorptive Stripping Voltammetric Determination of Trace Level Ricin in Castor Seeds Using a Boron-doped Diamond Electrode. ELECTROANAL 2017. [DOI: 10.1002/elan.201700100] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Araújo DT, de A. Gomes M, Silva RS, de Almeida CC, Martínez-Huitle CA, Eguiluz KIB, Salazar-Banda GR. Ternary dimensionally stable anodes composed of RuO2 and IrO2 with CeO2, SnO2, or Sb2O3 for efficient naphthalene and benzene electrochemical removal. J APPL ELECTROCHEM 2017. [DOI: 10.1007/s10800-017-1057-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Costa DJ, Santos JC, Sanches-Brandão FA, Ribeiro WF, Salazar-Banda GR, Araujo MC. Boron-doped diamond electrode acting as a voltammetric sensor for the detection of methomyl pesticide. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.02.036] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Coledam DAC, Pupo MMS, Silva BF, Silva AJ, Eguiluz KIB, Salazar-Banda GR, Aquino JM. Electrochemical mineralization of cephalexin using a conductive diamond anode: A mechanistic and toxicity investigation. CHEMOSPHERE 2017; 168:638-647. [PMID: 27847122 DOI: 10.1016/j.chemosphere.2016.11.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 11/02/2016] [Accepted: 11/03/2016] [Indexed: 05/21/2023]
Abstract
The contamination of surface and ground water by antibiotics is of significant importance due to their potential chronic toxic effects to the aquatic and human lives. Thus, in this work, the electrochemical oxidation of cephalexin (CEX) was carried out in a one compartment filter-press flow cell using a boron-doped diamond (BDD) electrode as anode. During the electrolysis, the investigated variables were: supporting electrolyte (Na2SO4, NaCl, NaNO3, and Na2CO3) at constant ionic strength (0.1 M), pH (3, 7, 10, and without control), and current density (5, 10 and 20 mA cm-2). The oxidation and mineralization of CEX were assessed by high performance liquid chromatography, coupled to mass spectrometry and total organic carbon. The oxidation process of CEX was dependent on the type of electrolyte and on pH of the solution due to the distinct oxidant species electrogenerated; however, the conversion of CEX and its hydroxylated intermediates to CO2 depends only on their diffusion to the surface of the BDD. In the final stages of electrolysis, an accumulation of recalcitrant oxamic and oxalic carboxylic acids, was detected. Finally, the growth inhibition assay with Escherichia coli cells showed that the toxicity of CEX solution decreased along the electrochemical treatment due to the rupture of the β-lactam ring of the antibiotic.
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Figueredo-Sobrinho FAA, Santos LPM, Leite DS, Craveiro DC, Santos SH, Eguiluz KIB, Salazar-Banda GR, Maciel CD, Coutinho-Neto MD, Homem-de-Mello P, de Lima-Neto P, Correia AN. Morphological dependence of silver electrodeposits investigated by changing the ionic liquid solvent and the deposition parameters. Phys Chem Chem Phys 2016; 18:7242-50. [PMID: 26891224 DOI: 10.1039/c5cp06665d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The low toxicity and environmentally compatible ionic liquids (ILs) are alternatives to the toxic and harmful cyanide-based baths used in industrial silver electrodeposition. Here, we report the successful galvanostatic electrodeposition of silver films using the air and water stable ILs 1-ethyl-3-methylimidazolium trifluoromethylsulfonate ([EMIM]TfO) and 1-H-3-methylimidazolium hydrogen sulphate ([HMIM(+)][HSO4(-)]) as solvents and AgTfO as the source of silver. The electrochemical deposition parameters were thoughtfully studied by cyclic voltammetry before deposition. The electrodeposits were characterized by scanning electron microscopy coupled with X-ray energy dispersive spectroscopy and X-ray diffraction. Molecular dynamics (MD) simulations were used to investigate the structural dynamic and energetic properties of AgTfO in both ILs. Cyclic voltammetry experiments revealed that the reduction of silver is a diffusion-controlled process. The morphology of the silver coatings obtained in [EMIM]TfO is independent of the applied current density, resulting in nodular electrodeposits grouped as crystalline clusters. However, the current density significantly influences the morphology of silver electrodeposits obtained in [HMIM(+)][HSO4(-)], thus evolving from dendrites at 15 mA cm(-2) to the coexistence of dendrites and columnar shapes at 30 mA cm(-2). These differences are probably due to the greater interaction of Ag(+) with [HSO4(-)] than with TfO(-), as indicated by the MD simulations. The morphology of Ag deposits is independent of the electrodeposition temperature for both ILs, but higher values of temperature promoted increased cluster sizes. Pure face-centred cubic polycrystalline Ag was deposited on the films with crystallite sizes on the nanometre scale. The morphological dependence of Ag electrodeposits obtained in the [HMIM(+)][HSO4(-)] IL on the current density applied opens up the opportunity to produce different and predetermined Ag deposits.
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Santos TÉS, Silva RS, Meneses CT, Martínez-Huitle CA, Eguiluz KIB, Salazar-Banda GR. Unexpected Enhancement of Electrocatalytic Nature of Ti/(RuO2)x–(Sb2O5)y Anodes Prepared by the Ionic Liquid-Thermal Decomposition Method. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.5b04690] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Pereira GF, El-Ghenymy A, Thiam A, Carlesi C, Eguiluz KI, Salazar-Banda GR, Brillas E. Effective removal of Orange-G azo dye from water by electro-Fenton and photoelectro-Fenton processes using a boron-doped diamond anode. Sep Purif Technol 2016. [DOI: 10.1016/j.seppur.2016.01.029] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Pupo MMS, López-Suárez FE, Bueno-López A, Meneses CT, Eguiluz KIB, Salazar-Banda GR. Sn@Pt and Rh@Pt core–shell nanoparticles synthesis for glycerol oxidation. J APPL ELECTROCHEM 2014. [DOI: 10.1007/s10800-014-0757-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Góes ACSF, Souza O, Oliveira RTS, Cesarino I, Machado SAS, Eguiluz KIB, Cavalcanti EB, Salazar-Banda GR. High-Area Ti/Pt Electrodes for the Electrochemically Catalyzed Transesterification of Soybean Oil with Methanol. CHEM ENG COMMUN 2014. [DOI: 10.1080/00986445.2014.956736] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Lourenço AS, Sanches FA, Magalhães RR, Costa DJ, Ribeiro WF, Bichinho KM, Salazar-Banda GR, Araújo MC. Electrochemical oxidation and electroanalytical determination of xylitol at a boron-doped diamond electrode. Talanta 2014; 119:509-16. [DOI: 10.1016/j.talanta.2013.11.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 11/06/2013] [Accepted: 11/08/2013] [Indexed: 10/26/2022]
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Souza LLA, Almeida GRO, Silva LSR, Bergamaski FOF, Lima ÁS, Eguiluz KIB, Salazar-Banda GR. Outstanding electro-catalytic activity of Pt x –(RuO y –CeO2)1−x /C composites towards ethanol oxidation in acid media. J APPL ELECTROCHEM 2013. [DOI: 10.1007/s10800-013-0583-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Pupo MMS, Costa LSD, Figueiredo AC, Silva RSD, Cunha FGC, Eguiluz KIB, Salazar-Banda GR. Photoelectrocatalytic degradation of indanthrene blue dye using Ti/Ru-based electrodes prepared by a modified Pechini method. J BRAZIL CHEM SOC 2013. [DOI: 10.1590/s0103-50532013000300014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Malpass GRP, Salazar-Banda GR, Miwa DW, Machado SAS, Motheo AJ. Comparing atrazine and cyanuric acid electro-oxidation on mixed oxide and boron-doped diamond electrodes. ENVIRONMENTAL TECHNOLOGY 2013; 34:1043-1051. [PMID: 23837356 DOI: 10.1080/09593330.2012.733420] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The breakdown of pesticides has been promoted by many methods for clean up of contaminated soil and wastewaters. The main goal is to decrease the toxicity of the parent compound to achieve non-toxic compounds or even, when complete mineralization occurs, carbon dioxide and water. Therefore, electrochemical degradation (potentiostatic and galvanostatic) of both the pesticide atrazine and cyanuric acid (CA) at boron-doped diamond (BDD) and Ti/Ru0.3Ti0.7O2 dimensionally stable anode (DSA) electrodes, in different supporting electrolytes (NaCl and Na2SO4), is presented with the aim of establishing the influence of the operational parameters on the process efficiency. The results demonstrate that both the electrode material and the supporting electrolyte have a strong influence on the rate of atrazine removal. In the chloride medium, the rate of atrazine removal is always greater than in sulfate under all conditions employed. Furthermore, in the sulfate medium, atrazine degradation was significant only at the BDD electrode. The total organic carbon (TOC) load decreased by 79% and 56% at the BDD and DSA electrodes, respectively, in the chloride medium. This trend was maintained in the sulfate medium but the TOC removal was lower (i.e. 33% and 13% at BDD and DSA electrodes, respectively). CA, a stable atrazine degradation intermediate, was also studied and it is efficiently removed using the BDD electrode in both media, mainly when high current densities are employed. The use of the BDD electrode in the chloride medium not only degrades atrazine but also mineralized cyanuric acid leading to the higher TOC removal.
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Ribeiro WF, da Costa DJE, Lourenço AS, Lopes IC, de Medeiros EP, Salazar-Banda GR, do Nascimento VB, de Araújo MCU. Electrochemical study of ricin at glassy carbon electrode. Analyst 2013; 138:4565-73. [DOI: 10.1039/c3an00227f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Salazar-Banda GR, Eguiluz KIB, Carvalho AED, Avaca LA. Ultramicroelectrode Array Behavior of Electrochemically Partially Blocked Boron‑Doped Diamond Surface. J BRAZIL CHEM SOC 2013. [DOI: 10.5935/0103-5053.20130141] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Palomino-Romero JA, Salazar-Banda GR, de O. Rezende MO. Treatment of Sewage by Electroflotation: A Pilot Study. SEP SCI TECHNOL 2013. [DOI: 10.1080/01496395.2012.682616] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Pupo MMS, Costa LSD, Figueiredo AC, Silva RSD, Cunha FGC, Eguiluz KIB, Salazar-Banda GR. Photoelectrocatalytic Degradation of Indanthrene Blue Dye using Ti/Ru-Based Electrodes Prepared by a Modified Pechini Method. J BRAZIL CHEM SOC 2013. [DOI: 10.5935/0103-5053.20130062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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