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, equilibria between Al3+, oxalic acid (H2L), and OH were studied in 0.6 mol dm-3 NaCl medium at 25 °C.
Abstract: Equilibria between Al3+, oxalic acid (H2L), and OH– were studied in 0.6 mol dm–3 NaCl medium at 25 °C. Potentiometric titrations (glass electrode) and 27Al n.m.r. measurements were performed to study speciation and equilibria within the concentration ranges 0.2 ⩽–log [H+]⩽ 7.2, 0.0005 ⩽b⩽ 0.02 mol dm–3, 0.0005 ⩽c⩽ 0.025 mol dm–3, and 0.5 ⩽c/b⩽ 16 [b and c are the total concentrations of aluminium(III) and oxalic acid respectively]. Besides a series of [AILn]3 – 2n complexes with n= 1,2, and 3, the formation of the polynuclear mixed hydroxo-complexes Al3(OH)3L3 and [Al2(OH)2L4]4 – were established. N.m.r. data also indicated the formation of an [AlHL]2+ complex in strongly acidic solutions: pKa([AlHL]2+)≈ 0.0. The significance of the different Al complexes to conditions prevailing in natural waters is discussed, including a model calculation of the solubility of a clay mineral (kaolinite) in the presence of oxalate. Data were analysed using the least-squares computer program LETAGROPVRID.
55 citations
TL;DR: In this article, the roles of HSS induced acid products of MEA degradation were evaluated and it was shown that formic and acetic acids exist in 2 forms in equilibrium; namely, salts and amides.
55 citations
TL;DR: There is a lack of consensus in the literature as to whether efficiency of oxalate absorption is dependent on the proportion of total dietary oxalic acid that is in a soluble form, but studies that directly compared foods of varying solubleOxalate contents have generally supported the proposition that the amount of soluble oxalates in food is an important determinant of Oxalate bioavailability.
55 citations
TL;DR: In this paper, a simple route for synthesis of nanocrystalline N-doped titania by calcination of acidified TiCl 3 in presence of urea and oxalic acid was demonstrated.
55 citations
TL;DR: In this paper, the phase and size controlled synthesis of tungsten oxide hydrates at room temperature via a simple precipitation method was reported, where oxalic acid was found to play a central role in phase transition due to its chelating nature that facilitates bonding of oxalate ions to Tungsten cations leading to formation of WO3·2H2O.
Abstract: Controlling the crystal phase of a material using solution-based method is a challenging task and has significant consequence to the material’s properties. Herein we report the phase and size-controlled synthesis of tungsten oxide hydrates at room temperature via a simple precipitation method. In the absence and presence of oxalic acid, orthorhombic WO3·H2O and monoclinic WO3·2H2O nanoplates of size in the range of 200–600 (thickness <50 nm) and 40–200 nm (thickness <20 nm) were respectively synthesized. Oxalic acid is found to play the central role in the phase transition due to its chelating nature that facilitates bonding of oxalate ions to tungsten cations leading to formation of WO3·2H2O. Upon annealing at 400 °C for 2 h under air, both WO3·H2O and WO3·2H2O nanoplates were converted to monoclinic WO3 nanoplates. These nanoplates were demonstrated to be highly efficient for the photocatalytic detoxification of toxic Cr(VI) in the acidic pH under the visible light irradiation. The best Cr(VI) reduction...
55 citations