Topic
Oxalic acid
About: Oxalic acid is a research topic. Over the lifetime, 11584 publications have been published within this topic receiving 173263 citations. The topic is also known as: ethanedioic acid & H2ox.
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TL;DR: In this article, the drug paracetamol was treated with ozone alone and catalyzed with Fe 2+, Cu 2+ and/or UVA light at 25.0°C.
Abstract: Acid solutions containing up to 1 g l −1 of the drug paracetamol have been treated with ozone alone and ozonation catalyzed with Fe 2+ , Cu 2+ and/or UVA light at 25.0 °C. Direct ozonation yields poor degradation due to the high stability of final carboxylic acids formed, whereas more than 83% of mineralization is attained with the catalyzed methods. Under UVA irradiation, organics can be efficiently destroyed by the combined action of generated H 2 O 2 and UVA light. In the presence of Fe 2+ and UVA light, the process is accelerated due to the production of oxidant hydroxyl radical ( OH) and the photodecomposition of Fe 3+ complexes. The highest oxidizing power is achieved by combining Fe 2+ , Cu 2+ and UVA light, because complexes of final acids with Cu 2+ are more quickly degraded than those competitively formed with Fe 3+ . For all catalyzed methods, the initial mineralization rate is enhanced and the percent of degradation generally drops with increasing drug concentration. The paracetamol decay always follows a pseudo-first-order reaction with slightly higher rate constant for catalyzed systems than direct ozonation. Aromatic products such as hydroquinone, p -benzoquinone and 2-hydroxy-4-( N -acetyl)aminophenol are identified by gas chromatography–mass spectrometry (GC–MS) and reversed-phase chromatography. Acetamide is generated when hydroquinone is produced. These products are degraded to oxalic and oxamic acids as ultimate carboxylic acids, as detected by GC–MS and ion-exclusion chromatography. Oxalic acid is generated via glycolic, glyoxylic, tartronic, ketomalonic and maleic acids. While Fe 3+ -oxalato complexes are photolyzed by UVA light, Cu 2+ -oxalato, Fe 3+ -oxamato and Cu 2+ -oxamato complexes are oxidized with OH. NH 4 + and NO 3 − ions are produced during mineralization.
173 citations
TL;DR: In this paper, a well characterized cathode material (LiCoO2) recovered from spent lithium-ion battery is dissolved in aqueous mixture of citric acid (chelating agent) and ascorbic acid (reductant) at 80°C.
172 citations
TL;DR: In this paper, the photocatalytic activity of the as-obtained CuFe2O4 nanoparticles has been evaluated based on the H2 evolution from aqueous oxalic acid solution under visible light irradiation.
172 citations
TL;DR: Four patients (three of them sibs) with recurrent calcium oxalate kidney stones excreted urinary oxalic acid and also an organic acid absent from normal urine and shown to be L-glyceric acid are studied.
Abstract: Four patients (three of them sibs) with recurrent calcium oxalate kidney stones excreted urinary oxalic acid and also an organic acid absent from normal urine and shown to be L-glyceric ac...
171 citations
TL;DR: In this paper, the authors analyzed aerosol samples from the South African savanna were analyzed for their polar organic constituents and found that Oxalic acid was the dominating compound with an average amount of 79.2 ǫ m−m−3 on the front filter and 11.3 nǫ n−m −3 on a back-up filter.
170 citations