Electrochemical behavior and determination of arsenic (III) from water using ag-doped-zeolitecarbon nanotubes composite electrode

The electrochemical behavior of Arsenic (III) from water was investigated using Agdoped-synthetic zeolite-carbon nanotubes composite electrode envisaging its determination in the aqueous solution. The electrocatalytic oxidation of arsenic in acidic medium at Ag-doped -synthetic zeolite-carbon nanotubes composite electrode (Ag-ZCNT) was investigated by cyclic voltammetry, with different practical working pretreatment applications

Capecitabine removal from water using commercial granular activated carbon

The aim of this study consisted of removal of capecitabine (CCB), a cytostatic that is often used in cancer therapy and its presence in water exhibited negative impact and risk on the human health. Granular activated carbon (GAC) was tested as sorbent in batch system for CCB removal from water, considering its common usage in water/wastewater treatment technology. Influence of operation variables, e.g, pH, GAC dose and CCB initial concentrations, was studied to optimize GAC-based sorption for CCB removal

Simultaneous/selective voltammetric detection of diclofenac and tetracycline in water on graphene modified-boron-doped diamond electrode

The graphene oxide modified boron-doped diamond electrode (GO/BDD) was obtained electrochemically and tested by cyclic voltammetry (CV) to detect diclofenac (DCF) from antiinflammatory pharmaceuticals class and tetracycline (TC) from antibiotics one, which belongs to emerging pollutants from water. Graphene reduced electrochemically from its oxide showed enhanced sensitivity in determining individual and selective or simultaneous of DCF and TC. The cyclic voltammetry method - based protocol for selective/simultaneous detection of DCF and TC was developed in this study using a commercial boron-doped diamond (BDD) electrode modified with graphene oxide (GO)

Voltammetric detection of drugs considered as emerging pollutant in water at carbon nanofiber composite electrode

In this study, carbon nanofiber-epoxy (CNF) composite electrode was tested using cyclic voltammetry (CV), differential-pulsed voltammetry (DPV) and square-wave voltammetry (SWV) techniques for the quantitative determination of naproxen (NPX), which was chosen the model for the anti-inflammatory drugs as emerging pollutants from water. The best performance in relation with the sensitivity and the detection potential value was obtained by employing DPV, and in relation with the lowest limit of detection and quantification was achieved by SWV under operating conditions of modulation amplitude of 0.2V, step potential of 0.05V and a scan rate of 0.025V

Electrochemical nitrification of ammonium in simulated groundwater using boron-doped diamond electrodes

In this work, the electrochemical oxidation of ammonium from simulated groundwater on boron-doped diamond (BDD) electrodes was assessed in order to be integrated within the drinking water treatment technology. All nitrogen species, i.e., nitrate, nitrite and total nitrogen, were monitored to assess the electrochemical nitrification of ammonium until gaseous nitrogen. For the simulated groundwater containing ammonium concentration of about 1 mgL-1 , the application of electrochemical oxidation at lab scale using BDD electrodes at the current density of 50 Am-2 assured an efficient oxidation of ammonium resulting nitrate at the concentration below maximum allowance concentration, as main intermediate of the electrochemical nitrification

The Stigma of the Medical Personnel in Psychiatry

This research was structured as a descriptive study based on a questionnaire with seven questions, addressed to the medical personnel involved in the medical assistance of the patient with mental disorders (psychiatrists, family doctors, physicians from other specialties, psychologists). This study refers to the relationship medical team – psychiatric patient from the point of view of the health professionals. The main appreciation criteria refer to the lack of knowledge or minimizing the importance of patients’ rights, aspect that can influence the voluntary addressability of psychiatric patients to treatment and therapeutic success.The lot of this study had a number of 217 subjects from which are part psychiatrists, family doctors, physicians from other specialties and psychologists, who work in therapy centers and hospitals from the following counties: Iaşi, Botoşani, Suceava, Vaslui.</p

Simultaneous Voltammetric/Amperometric Determination of Sulfide and Nitrite in Water at BDD Electrode

This work reported new voltammetric/amperometric-based protocols using a commercial boron-doped diamond (BDD) electrode for simple and fast simultaneous detection of sulfide and nitrite from water. Square-wave voltammetry operated under the optimized working conditions of 0.01 V step potential, 0.5 V modulation amplitude and 10 Hz frequency allowed achieving the best electroanalytical parameters for the simultaneous detection of nitrite and sulfide. For practical in-field detection applications, the multiple-pulsed amperometry technique was operated under optimized conditions, i.e., −0.5 V/SCE for a duration of 0.3 s as conditioning step, +0.85 V/SCE for a duration of 3 s that assure the sulfide oxidation and +1.25 V/SCE for a duration of 0.3 s, where the nitrite oxidation occurred, which allowed the simultaneously detection of sulfide and nitrite without interference between them. Good accuracy was found for this protocol in comparison with standardized methods for each anion. Also, no interference effect was found for the cation and anion species, which are common in the water matrix

Advanced Electrodegradation of Doxorubicin in Water Using a 3-D Ti/SnO2 Anode

This study investigated the application of an advanced electrooxidation process with three-dimensional tin oxide deposited onto a titanium plate anode, named 3-D Ti/SnO2, for the degradation and mineralization of one of the most important emerging contaminants with cytostatic properties, doxorubicin (DOX). The anode was synthesized using a commercial Ti plate, with corrosion control in acidic medium, used as a substrate for SnO2 deposition by the spin-coating method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses revealed that porous SnO2 was obtained, and the rutile phase of TiO2 was identified as an intermediary substrate onto the Ti plate. The results of CV analysis allowed us to determine the optimal operating conditions for the electrooxidation process conducted under a constant potential regime, controlled by the electron transfer or the diffusion mechanisms, involving hydroxyl radicals. The determination of UV&ndash;VIS spectra, total organic carbon (TOC), and chemical oxygen demand (COD) allowed us to identify the degradation mechanism and pathway of DOX onto the 3-D Ti/SnO2 anode. The effective degradation and mineralization of DOX contained in water by the electrooxidation process with this new 3-D dimensionally stable anode (DSA) was demonstrated in this study

Electrochemical Determination of Pentach- lorophenol

Abstract: 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 μM 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 OPEN ACCESS Sensors 2012, 12 7034 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