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Naproxen (NPX) degradation was investigated by anodic oxidation both at constant potential and by cyclic voltammetry, using this last technique for optimizing reaction conditions and catalyst properties. Three multiwall carbon nanotubes (MWCNTs)-promoted electrodes were used (MWCNT, MWCNT-COOH and MWCNT-NH) and a two steps oxidation process was observed in all the cases. At the optimized conditions (volume of MWCNT = 15 μL), the influence of the scan rate indicates the diffusion-adsorption control of the process. Likewise, the kinetic study of NPX degradation at fix potential, considering two different stirring speeds (250 and 500 rpm), indicates that degradation rate increases with the stirring speed. After 20 h, NPX is degraded even an 82.5%, whereas the mineralization reaches almost 70%, as it was obtained from total organic carbon analysis. The pH effect was also analysed, in the range 5-11, observing a positive effect at low pH. Concerning the surface chemistry of the electrode, MWCNT-NH, with the highest isoelectric point (4.70), is the most promising material due to the improved interactions with the reactant. From these observations, a pathway is proposed, which includes two steps of electrochemical oxidation followed by subsequent oxidation steps, until mineralization of the NPX, attributed mainly to active chlorine species and ·OH.
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http://dx.doi.org/10.2166/wst.2019.070 | DOI Listing |
J Colloid Interface Sci
December 2024
Pingshan Translational Medicine Center, Shenzhen Bay Laboratory, Shenzhen 518118, China. Electronic address:
Copper-based materials are promising for formaldehyde oxidation to produce hydrogen but suffer from degradation caused by soluble copper ions in alkaline electrolytes. In this report, a novel CuPd/CC alloy electrocatalyst is developed to address this issue. The catalyst drives formaldehyde oxidation at 0.
View Article and Find Full Text PDFSmall
December 2024
School of Materials Science and Engineering, State Key Laboratory of Material Processing and Die and Mold Technology, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, P. R. China.
The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are key processes in numerous oxygen-involved applications over a wide temperature range. Despite advances in nanofiber engineering to increase active site density and catalytic efficiency for ORR/OER, conventional electrode fabrication methods often compromise the integrity of nanofibrous structures. Herein, a robust strategy is presented for the fabrication of LaCoNiO (LCN) nanofibrous membranes using optimized electrospinning techniques.
View Article and Find Full Text PDFWater Res
December 2024
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China; Institute of Sun Yat-Sen University in Shenzhen, PR China. Electronic address:
Electrochemical oxidation process (EOP) is promising for micropollutant degradation in water treatment, where chloride ions (Cl) are inevitable in aqueous systems, leading to the EOP/Cl system. The oxidation of Cl at anodes generates reactive chlorine species (RCS), including heterogeneous chlorine species (Cl), homogeneous free available chlorine (FAC), chlorine dioxide (ClO), and chlorine radicals (CRs). This study developed a method to differentiate various RCS responsible for the removal of carbamazepine in EOP/Cl using the RuO/IrO-Ti anode.
View Article and Find Full Text PDFNickel oxide (NiO) is known for its remarkable theoretical specific capacity, making it a highly appealing option for electrode materials in electrochemical energy storage applications. Nevertheless, its practical use is limited by poor electrochemical performance and complicated electrode fabrication processes. To address these issues, we propose a new anode design comprising an intermediate NiO nanoarray layer and a carbon coating layer grown directly on a three-dimensional (3D) conductive nickel foam substrate, designated as C@NiO@Ni foam.
View Article and Find Full Text PDFRSC Adv
December 2024
School of Materials Science and Engineering, Gwangju Institute of Science and Technology 123 Cheomdangwagi-ro, Buk-gu Gwangju 61005 Republic of Korea
Photoelectrochemical water splitting is a promising technology for converting solar energy into chemical energy. For this system to be practically viable, the materials and processes employed for photoelectrode fabrication should be cost-effective and scalable. Herein, we report the large-scale fabrication of nickel oxide-coated n-type silicon (n-Si) photoanodes chemical bath deposition for efficient photoelectrochemical water oxidation.
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