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: A probable role for ODC in P. placenta is to prevent the overaccumulation of oxalic acid, forming a nontoxic, buffered, low-pH environment that facilitates the decay process.
62 citations
TL;DR: In this article, the removal of 5-fluorouracil from water using the electro-Fenton process was studied and the results showed that the fastest degradation and almost complete mineralization was obtained at a Fe2+ catalyst concentration of 0.2mM.
Abstract: Cytostatic drugs are a troublesome class of emerging pollutants in water owing to their potential effects on DNA. Here we studied the removal of 5-fluorouracil from water using the electro-Fenton process. Galvanostatic electrolyses were performed with an undivided laboratory-scale cell equipped with a boron-doped diamond anode and a carbon felt cathode. Results show that the fastest degradation and almost complete mineralization was obtained at a Fe2+ catalyst concentration of 0.2 mM. The absolute rate constant for oxidation of 5-fluorouracil by hydroxyl radicals was 1.52 × 109 M−1 s−1. Oxalic and acetic acids were initially formed as main short-chain aliphatic by-products, then were completely degraded. After 6 h the final solution mainly contained inorganic ions (NH4
+, NO3
− and F−) and less than 10% of residual organic carbon. Hence, electro-Fenton constitutes an interesting alternative to degrade biorefractory drugs.
62 citations
TL;DR: In this article, a simple one-step hydrothermal method has been developed to prepare three-dimensional CeO2 microflower structures via a cerium oxalate precursor.
Abstract: In this paper, a simple one-step hydrothermal method has been developed to prepare three-dimensional CeO2 microflower structures via a cerium oxalate precursor. X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), field-emission scanning electron microscopy (FE-SEM) and thermal gravimetric (TG) analysis were utilized to characterize the products. Herein, unlike the conventional calcination of a cerium oxalate precursor, oxalic acid acted not only as a precipitator but also as a modifier of morphology with a defined amount of C2O42−, while hydrogen peroxide (H2O2) was introduced as an oxidant to make the full conversion from Ce2(C2O4)3·10H2O to CeO2 in the hydrothermal process with the preserved flowerlike morphology. The as-obtained CeO2 microflowers displayed a high surface area of 147.6 m2 g−1 and narrow pore size of 3.759 nm by N2 adsorption and desorption measurement, and the H2-TPR test showed its better reduction behavior. Furthermore, CeO2 microflowers with hierarchical structures presented a higher catalytic activity for CO oxidation.
62 citations
TL;DR: In this article, a significant amount of particulate H 2 Ox/oxalate (Ox) occurred in the coarse particle fraction of a dichotomous sampler, the ratio of oxalate concentrations in the PM 10 to PM 2.5 fractions ranged from 1 to 2, with mean±sd being 1.4±0.2.
62 citations
TL;DR: A nontoxic and straightforward cross-linking method has been developed for chitosan material; this method does not result in a brittle product, thus making it better than the use of toxic cross- linking reagents.
Abstract: Several nontoxic dicarboxylic acid solutions (oxalic acid, succinic acid, malic acid, and adipic acid solutions) instead of an acetic acid solution were used as solvents for chitosan dissolution. The amount of free amino groups of the chitosan in the solution decreased due to the ionic cross-linking of the dicarboxylic acids with chitosan. These solutions were used to fabricate porous chitosan membranes. Replacing acetic acid with these dicarboxylic acids for membrane preparation improved the water uptake (by 35% at most), tensile strength (by 110% at most), and elongation capability (by 50% at most) of the membranes. These dicarboxylic acid solutions not only act as solvents but also improve the material properties of the chitosan membranes due to the ionic cross-linking and hydrogen bond formation. In brief, a nontoxic and straightforward cross-linking method has been developed for chitosan material; this method does not result in a brittle product, thus making it better than the use of toxic cross-linking reagents.
62 citations