"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates"
"uuid:71313580-e49e-476b-898c-8a8ba3059404","http://resolver.tudelft.nl/uuid:71313580-e49e-476b-898c-8a8ba3059404","Electrochemical Oxidation and Determination of Oxalic Acid at an Exfoliated Graphite-Polystyrene Composite Electrode","Schoonman, J.; Manea, F.; Radovan, C.; Corb, I.; Pop, A.; Burtica, G.; Malchev, P.G.; Picken, S.J.","","2007","An exfoliated graphite-polystyrene composite electrode was evaluated as analternative electrode in the oxidation and the determination of oxalic acid in 0.1 M Na2SO4supporting electrolyte. Using CV, LSV, CA procedures, linear dependences I vs. C wereobtained in the concentrations range of oxalic acid between 0.5 to 3 mM, with LOD =0.05mM, and recovery degree of 98%, without need of surface renewing between successiveruns. The accuracy of the methods was evaluated as excellent comparing the detection resultswith that obtained using conventional KMnO4 titration method. In addition, the apparentdiffusion coefficient of oxalic acid D was found to be around 2.89 · 10-8 cm2·s-1 by CA andCV.","exfoliated graphite-polystyrene composite electrode; oxalic acid; electrochemical oxidation; electrochemical determination","en","journal article","MDPI","","","","","","","","Applied Sciences","","","","",""
"uuid:0fdb47d8-2140-4abb-8325-9b59c1cab2b4","http://resolver.tudelft.nl/uuid:0fdb47d8-2140-4abb-8325-9b59c1cab2b4","Carbon-based Composite Electrodes: Preparation, Characterization and Application in Electroanalysis","Corb, I.; Manea, F.; Radovan, C.; Pop, A.; Burtica, G.; Malchev, P.G.; Picken, S.J.; Schoonman, J.","","2007","Electrodes based on carbon, i.e., expanded graphite (20%, wt.)-epoxy composite (20EG-Epoxy) and expanded graphite (20%, wt.)-polystyrene composite (20EG-PS) have been prepared, characterized using scanning electron microscopy (SEM) and cyclic voltammetry (CV), and tested as anodic sensors. The electrodes exhibited good mechanical resistance and low electrical resistances. Scan rate dependent cyclic voltammetry responses at 20EG-Epoxy and 20EG-PS composite electrodes, which were exemplified for thiourea (TU), a toxic sulphur organic compound selected as testing target analyte in 0.1 M Na2SO4 supporting electrolyte, were investigated. The obtained voltammetric data were in accordance with those for a random array of microelectrodes. The voltammetric and chronoamperometric detection results of TU in tap water samples, without a supplementary addition of supporting electrolyte, at 20EG-Epoxy electrode proved its use for direct analysis of environmental samples.","carbon-based composite electrode; microelectrode array behavio; thiourea; electroanalysis","en","journal article","MDPI AG","","","","","","","","Applied Sciences","ChemE/Chemical Engineering","","","",""
"uuid:75ab7d41-fd77-4fdc-aab2-301d1a0ca59b","http://resolver.tudelft.nl/uuid:75ab7d41-fd77-4fdc-aab2-301d1a0ca59b","Voltammetric Detection of Urea on an Ag-Modified Zeolite- Expanded Graphite-Epoxy Composite Electrode","Manea, F.; Pop, A.; Radovan, C.; Malchev, P.G.; Bebeselea, A.; Burtica, G.; Picken, S.J.; Schoonman, J.","","2008","In this paper, a modified expanded graphite composite electrode based on natural zeolitic volcanic tuff modified with silver (EG-Ag-Z-Epoxy) was developed. Cyclic voltammetry measurements revealed a reasonably fast electron transfer and a good stability of the electrode in 0.1 M NaOH supporting electrolyte. This modified electrode exhibited moderate electrocatalytic effect towards urea oxidation, allowing its determination in aqueous solution. The linear dependence of the current versus urea concentration was reached using square-wave voltammetry in the concentrations range of urea between 0.2 to 1.4 mM, with a relatively low limit of detection of 0.05 mM. A moderate enhancement of electroanalytical sensitivity for the determination of urea at EG-Ag-Z-Epoxy electrode was reached by applying a chemical preconcentration step prior to voltammetric/amperometric quantification.","urea determination; expanded graphite-Ag-zeolite-epoxy composite electrode; electrocatalytic effect","en","journal article","MDPI AG","","","","","","","","Applied Sciences","ChemE/Chemical Engineering","","","",""
"uuid:875d52ca-852a-4c32-b929-9d7d02839bda","http://resolver.tudelft.nl/uuid:875d52ca-852a-4c32-b929-9d7d02839bda","Electrochemical Determination of Pentachlorophenol in Water on a Multi-Wall Carbon Nanotubes-Epoxy Composite Electrode","Remes, A.; Pop, A.; Manea, F.; Baciu, A.; Picken, S.J.; Schoonman, J.","","2012","The aim of this study was the preparation, characterization, and application of a multi-wall carbon nanotubes-epoxy composite electrode (MWCNT-EP) with 25%, wt. MWCNTs loading for the voltammetric/amperometric determination of pentachlorophenol (PCP) in aqueous solutions. The structural and morphological aspects of the MWCNT-EP composite electrode were examined by scanning electron microscopy. The electrical properties were characterized by direct-current conductivity measurements in relation with the percolation threshold. The electrochemical behavior of PCP at the MWCNT-EP composite electrode was investigated using cyclic voltammetry in 0.1 M Na2SO4 supporting electrolyte in order to establish the parameters for amperometric/voltammetric determination of PCP. The linear dependence of current vs. PCP concentrations was reached in a wide concentration range from 0.2 to 12 ?M PCP using cyclic voltammetry, differential-pulsed voltammetry, square-wave voltammetry, chronoamperometry, and multiple-pulsed amperometry techniques. The best electroanalytical performances of this composite electrode were achieved using a pre-concentration/square-wave voltammetric technique and also multiple-pulsed amperometry techniques envisaging the practical applications. The ease of preparation, high sensitivity, and stability of this composite electrode should open novel avenues and applications for fabricating robust sensors for detection of many important species.","multi-wall carbon nanotubes-epoxy composite electrode; electrochemical determination; pentachlorophenol; square-wave voltammetry; cyclic voltammetry","en","journal article","MDPI","","","","","","","","Applied Sciences","ChemE/Chemical Engineering","","","",""
"uuid:2592406a-960a-4aae-8ef6-0e53d6493090","http://resolver.tudelft.nl/uuid:2592406a-960a-4aae-8ef6-0e53d6493090","Copper-decorated carbon nanotubes-based composite electrodes for nonenzymatic detection of glucose","Pop, A.; Manea, F.; Orha, C.; Motoc, S.; Llinoiu, E.; Vaszilcsin, N.; Schoonman, J.","","2012","The aim of this study was to prepare three types of multiwall carbon nanotubes (CNT)-based composite electrodes and to modify their surface by copper electrodeposition for nonenzymatic oxidation and determination of glucose from aqueous solution. Copper-decorated multiwall carbon nanotubes composite electrode (Cu/CNT-epoxy) exhibited the highest sensitivity to glucose determination.","multiwall carbon nanotubes composite electrodes, copper particles, glucose, electrochemical determination","en","journal article","Springer-Verlag","","","","","","","","Applied Sciences","Chemical Engineering","","","",""
"uuid:4310f877-1bf6-403b-bf41-8261d9effa74","http://resolver.tudelft.nl/uuid:4310f877-1bf6-403b-bf41-8261d9effa74","Silver-functionalized carbon nanofiber composite electrodes for ibuprofen detection","Manea, F.; Motoc, S.; Pop, A.; Remes, A.; Schoonman, J.","","2012","The aim of this study is to prepare and characterize two types of silver-functionalized carbon nanofiber (CNF) composite electrodes, i.e., silver-decorated CNF-epoxy and silver-modified natural zeolite-CNF-epoxy composite electrodes suitable for ibuprofen detection in aqueous solution. Ag carbon nanotube composite electrode exhibited the best electroanalytical parameters through applying preconcentration/differential-pulsed voltammetry scheme.","carbon nanofiber composite electrodes; Ssilver particles; electrochemical determination; ibuprofen","en","journal article","SpringerOpen","","","","","","","","Applied Sciences","Chemical Engineering","","","",""
"uuid:51d08c0b-f457-42ea-bceb-4c1ce75aed34","http://resolver.tudelft.nl/uuid:51d08c0b-f457-42ea-bceb-4c1ce75aed34","Electrochemical Selective and Simultaneous Detection of Diclofenac and Ibuprofen in Aqueous Solution Using HKUST-1 Metal-Organic Framework-Carbon Nanofiber Composite Electrode","Motoc, Sorina (Romanian Academy); Manea, F. (Politehnica University of Timisoara); Iacob, Adriana (S.C. DATCOMP S.R.L); Martinez Joaristi, A.E. (TU Delft ChemE/Catalysis Engineering); Gascon, Jorge (TU Delft ChemE/Catalysis Engineering); Pop, A.C. (Politehnica University of Timisoara); Schoonman, J. (TU Delft ChemE/Materials for Energy Conversion and Storage)","","2016","In this study, the detection protocols for the individual, selective, and simultaneous determination of ibuprofen (IBP) and diclofenac (DCF) in aqueous solutions have been developed using HKUST-1 metal-organic framework-carbon nanofiber composite (HKUST-CNF) electrode. The morphological and electrical characterization of modified composite electrode prepared by film casting was studied by scanning electronic microscopy and four-point-probe methods. The electrochemical characterization of the electrode by cyclic voltammetry (CV) was considered the reference basis for the optimization of the operating conditions for chronoamperometry (CA) and multiple-pulsed amperometry (MPA). This electrode exhibited the possibility to selectively detect IBP and DCF by simple switching the detection potential using CA. However, the MPA operated under optimum working conditions of four potential levels selected based on CV shape in relation to the potential value, pulse time, and potential level number, and order allowed the selective/simultaneous detection of IBP and DCF characterized by the enhanced detection performance. For this application, the HKUST-CNF electrode exhibited a good stability and reproducibility of the results was achieved.","Chronoamperometry; Cyclic voltammetry; Diclofenac; Electrochemical selective and simultaneous detection; Ibuprofen; Metal-organic framework-carbon nanofiber composite electrode; Multiple-pulsed amperometry","en","journal article","","","","","","","","","","","ChemE/Catalysis Engineering","","",""
"uuid:efa89af9-1006-4cb4-8cc9-4dd15061ee62","http://resolver.tudelft.nl/uuid:efa89af9-1006-4cb4-8cc9-4dd15061ee62","Simultaneous Voltammetric Detection of Carbaryl and Paraquat Pesticides on Graphene-Modified Boron-Doped Diamond Electrode","Pop, Aniela (Politehnica University of Timisoara); Manea, Florica (Politehnica University of Timisoara); Flueras, Adriana (Politehnica University of Timisoara); Schoonman, J. (TU Delft ChemE/Materials for Energy Conversion and Storage)","","2017","Monitoring of pesticide residues in food, beverages, and the environment requires fast, versatile, and sensitive analyzing methods. Direct electrochemical detection of pesticides could represent an efficient solution. Adequate electrode material, electrochemical technique, and optimal operation parameters define the detection method for practical application. In this study, cyclic voltammetric and differential pulse voltammetric techniques were used in order to individually and simultaneously detect two pesticides, i.e., carbaryl (CR) and paraquat (PQ), from an acetate buffer solution and also from natural apple juice. A graphene-modified boron-doped diamond electrode, denoted BDDGR, was obtained and successfully applied in the simultaneous detection of CR and PQ pesticides, using the differential pulse voltammetric technique with remarkable electroanalytical parameters in terms of sensitivity: 33.27 μA μM−1 cm−2 for CR and 31.83 μA μM−1 cm−2 for PQ. These outstanding results obtained in the acetate buffer supporting electrolyte allowed us to simultaneously detect the targeted pesticides in natural apple juice.","direct electrochemical detection; carbaryl; paraquat; simultaneous detection; pesticide residues; natural juice","en","journal article","","","","","","","","","","","ChemE/Materials for Energy Conversion and Storage","","",""
"uuid:ee965457-b664-4856-a067-0f031e6b22b0","http://resolver.tudelft.nl/uuid:ee965457-b664-4856-a067-0f031e6b22b0","Fast simultaneous electrochemical detection of tetracycline and fluoxetine in water","Ardelean, Magdalena (Politehnica University of Timisoara); Pode, Rodica (Politehnica University of Timisoara); Schoonman, J. (TU Delft ChemE/Materials for Energy Conversion and Storage); Pop, Aniela (Politehnica University of Timisoara); Manea, Florica (Politehnica University of Timisoara)","","2017","The electrochemical methods-based protocol for simultaneous detection of tetracycline (TC) from antibiotics class and fluoxetine (FXT) from anti-depressive pharmaceuticals class, which belongs to emerging pollutants from water, was developed in this study using carbon nanofiber-epoxy composite electrode (CNF). The electrochemical behaviour of each pharmaceutical on CNF was considered the basis for simultaneous detection of both pharmaceuticals from water. TC electrooxidation on CNF occurred in two steps and, consequently, two detection potentials are considered. FXT electrooxidation occurred in one step that is overlaid to the first step of TC detection, this step being considered as cumulative for both pharmaceuticals. Each electrochemical method of cyclic voltammetry (CV) and differential-pulsed voltammetry (DPV) allowed detecting cumulative presence of TC and FXT at the detection potential ranged between 0.65 and 0.815 V vs. SCE and the selective detection of TC at the detection potential ranged between 0.956 and 1.14 V vs. SCE. The electroanalytical parameters related to the lowest limit of detection and sensitivity recommended this electrode to exhibit the potential for practical applications in the electrochemical detection of certain pharmaceuticals as emerging pollutants from water.","Carbon nanofiber composite electrode.; Fluoxetine; Simultaneous electrochemical detection; Tetracycline","en","journal article","","","","","","","","","","","ChemE/Materials for Energy Conversion and Storage","","",""
"uuid:47f7e8cc-8092-49ab-93d9-699e5f86e25f","http://resolver.tudelft.nl/uuid:47f7e8cc-8092-49ab-93d9-699e5f86e25f","TIO2-modified zeolite-carbon nanotubes composite electrode for photoelectrodegradation of pentachlorophenol from water under uv irradiation","Jakab, Agnes (Politehnica University of Timisoara); Pode, Rodica (Politehnica University of Timisoara); Pop, Aniela (Politehnica University of Timisoara); Schoonman, J. (TU Delft ChemE/Materials for Energy Conversion and Storage); Orha, Corina (National Institute for Research and Development in Electrochemistry and Condensed Matter); Manea, Florica (Politehnica University of Timisoara)","","2017","Three types of composite electrode materials, i.e. carbon nanotubes-epoxy (CNT), zeolite-carbon nanotubes-epoxy (ZCNT) and TiO2-modified zeolite-carbon nanotubes-epoxy (TiZCNT), were synthesized, morphologically and electrically characterized, and tested in the photoelectrodegradation of pentachlorophenol (PCP) from water. The electrode composite materials were synthesized by the two-roll mill method, and a higher porosity of zeolite-modified electrode, caused by the zeolite incorporation, was noticed by means of scanning electron microscopy. Electroactive surface area, determined by classical methods using cyclic voltammetry (CV), and electric conductivity, determined by the four-point method, were negatively affected by the presence of zeolite. The photoelectrochemical behaviour of the electrodes, under ultraviolet (UV) irradiation, towards the pentachlorophenol oxidation was studied, and the photoelectrocatalytic activity of each electrode was determined. The PCP oxidation occurred in two steps at +0.65 V and +0.94 V vs. saturated calomel electrode SCE under UV irradiation. The oxidation peak recorded at +0.65 V vs. SCE appeared only under UV irradiation and it is considered that the photoelectrooxidation peak corresponded to PCP photoelectrooxidation. Also, the enhancement of PCP electrooxidation at +0.94 V vs. SCE was noticed under UV irradiation, which confirmed the photelectrocatalytic activity. The performance of the PCP degradation process, expressed as degradation efficiency and electrochemical efficiency, recommended the operation of photoelectrocatalysis at a bias voltage application of +0.8 V/SCE, while the mineralization degree recommended a bias voltage value of +1.5 V/SCE.","Pentachlorophenol; Photoelectrodegradation.; TiO2-modified zeolite-carbon nanotubes-epoxy composite electrode; Wastewater treatment","en","journal article","","","","","","","","","","","ChemE/Materials for Energy Conversion and Storage","","",""