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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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Journal ArticleDOI
TL;DR: In this article, the ozonation kinetics of oxalic acid in water in the presence of an activated carbon has been investigated at acid pH, and experimental results suggest that the reaction proceeds in the water phase between oxalric acid and oxidant species, likely hydroxyl radicals, coming from the ozone decomposition on the carbon surface.
Abstract: The ozonation kinetics of oxalic acid in water in the presence of an activated carbon has been investigated at acid pH. The presence of the activated carbon significantly enhances the degradation rate of oxalic acid if compared to single ozonation and single adsorption. According to total organic carbon measurements, nearly complete mineralization of oxalic acid can be achieved depending on the experimental conditions. The presence of tert-butyl alcohol, which scarcely adsorbs on the carbon surface at the conditions investigated, led to a significant reduction of the oxalic acid removal rate. Consequently, experimental results suggest that the reaction proceeds in the water phase between oxalic acid and oxidant species, likely hydroxyl radicals, coming from the ozone decomposition on the carbon surface. The proposed mechanism yielded a first-order kinetics with respect to ozone, close to the 0.8 order experimentally observed. Also, the energy of activation was found to be approximately 15 kcal mol-1.

137 citations

Journal ArticleDOI
TL;DR: Results suggest that oxalic acid is available as a natural antioxidant as well as suppressing in vitro lipid peroxidation in a concentration-dependent manner.

136 citations

Journal ArticleDOI
TL;DR: In this paper, a new recycling process for (microwave) roasted NdFeB magnets is proposed, based on the carboxyl-functionalized ionic liquid: betainium bis(trifluoromethylsulfonyl)imide, [Hbet][Tf2N].

135 citations

Journal ArticleDOI
TL;DR: In this article, the behavior of n-GaN in various aqueous solutions was studied using rotating disk voltammetry, cyclic voltammetric measurements, and electrical impedance measurements.
Abstract: The (photo)electrochemical behavior of n-GaN[0001] in various aqueous solutions was studied using rotating-disk voltammetry, cyclic voltammetry, and electrical impedance measurements. It was found that the bandedges of the semiconductor shift over 60 mV/pH unit, indicating acid-base equilibria at the interface. In H 2 SO 4 and KOH solutions, the photocurrent under anodic bias is associated with the oxidation of the semiconductor according to a three-equivalent reaction, leading to dissolution and roughening of the surface. In 1.2 M HCl solutions, n-GaN is stabilized for anodic decomposition due to the competing oxidation of Cl - ions. In the presence of oxalic acid and citric acid, anodic photocurrent multiplication was observed. Under cathodic polarization in the dark, Fe 3+ , Ce 4+ , HIO 3 , in acid medium and Fe(CN) 3- 6 in alkaline medium are electrochemically reduced at a diffusion-limited rate. In I M KOH a high reactivity for O 2 /H 2 O reduction is observed, explaining why n-GaN can be photoetched under open-circuit conditions in this solution.

135 citations

Journal ArticleDOI
TL;DR: NJDL-12 has higher ability in acid production and has stronger adaptability to acidic environment than NJDL-03, and the citric acid production increases significantly for NJ DL-12 at acidic environment, whereas formic and oxalic acids decrease sharply for both two fungi.
Abstract: Phosphate solubilizing fungi (PSF) have huge potentials in enhancing release of phosphorus from fertilizer. Two PSF (NJDL-03 and NJDL-12) were isolated and identified as Penicillium oxalicum and Aspergillus niger respectively in this study. The quantification and identification of organic acids were performed by HPLC. Total concentrations of organic acids secreted by NJDL-03 and NJDL-12 are ~4000 and ~10,000 mg/L with pH values of 3.6 and 2.4 respectively after five-days culture. Oxalic acid dominates acidity in the medium due to its high concentration and high acidity constant. The two fungi were also cultured for five days with the initial pH values of the medium varied from 6.5 to 1.5. The biomass reached the maximum when the initial pH values are 4.5 for NJDL-03 and 2.5 for NJDL-12. The organic acids for NJDL-12 reach the maximum at the initial pH = 5.5. However, the acids by NJDL-03 continue to decrease and proliferation of the fungus terminates at pH = 2.5. The citric acid production increases significantly for NJDL-12 at acidic environment, whereas formic and oxalic acids decrease sharply for both two fungi. This study shows that NJDL-12 has higher ability in acid production and has stronger adaptability to acidic environment than NJDL-03.

135 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023292
2022561
2021266
2020352
2019482
2018455