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, it was proposed that adsorbed oxalic acid reacts directly with ozone in solution, with the ozone adsorption stage being the rate-limiting step.
Abstract: Removal of oxalic acid from water has been accomplished through TiO 2 /Al 2 O 3 catalytic ozonation The combined use of ozone and the titanium catalyst leads to a conspicuous 80% of oxalic acid conversion in 3 h which compares favorably to the hardly 2% reached in the absence of the catalyst at pH 25 At the experimental conditions applied, the catalytic process develops under complete carbon mineralization and does not proceed through hydroxyl radical oxidation The process rate can be described by considering an Eley–Rideal mechanism Thus, it is proposed that adsorbed oxalic acid reacts directly with ozone in solution, the oxalic acid adsorption stage being the rate-limiting step This mechanism justifies the experimental kinetic orders found in the range 1 and 0–1 for oxalic acid and ozone, respectively The apparent activation energy of the catalytic ozonation was also found to be 14 kcal mol −1
138 citations
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TL;DR: A review of oxalate metabolism and the clinical syndromes leading to hyperoxaluria can be found in this article, which is the most common chronic disorder of the urinary tract in the United States.
138 citations
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TL;DR: In this paper, the authors investigated the characteristics of dissolution of iron oxides in oxalic acid and found that the dissolution rate increases with increasing oxalate concentration at the constant pH values set within the optimum range of pH2.5-3.0.
138 citations
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TL;DR: It is concluded that coupling visible irradiation and hydroquinone could be a strong and universal driving force in the Fenton reaction for the complete degradation and mineralization of organic pollutants, even in the presence of LMWOAs.
Abstract: The influence of low-molecular-weight organic acids (LMWOAs), such as malonic acid, ethylenediaminetetraacetic acid, and oxalic acid, on the Fenton degradation of organic pollutants was examined under visible irradiation (λ > 450 nm). The Fenton degradation of malachite green in the dark was completely blocked in the presence of LMWOAs. It was found that either visible light irradiation or the addition of hydroquinone could initiate the dye degradation, but the mineralization yield was almost zero. An important result was that the dye mineralization in the presence of LMWOAs could be achieved when both visible irradiation and hydroquinone were introduced. Similar results were obtained with colorless pollutants, such as benzyltrimethylammonium chloride and 2,4,5-trichlorophenol. We concluded that coupling visible irradiation and hydroquinone could be a strong and universal driving force in the Fenton reaction for the complete degradation and mineralization of organic pollutants, even in the presence of LMWOAs.
137 citations
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TL;DR: In the CaCO(3)-containing media, Schizophyllum commune, Merulius tremellosus, and Porodisculus pendulus were found to produce substantial amounts of L-malic acid as a main metabolic product, along with small quantities of oxalic and other acids in shake cultures.
Abstract: Sixty-seven strains belonging to 47 species of Basidiomycetes were examined for their acid-producing abilities in glucose media, in both the presence and absence of CaCO(3), in stationary and shake cultures. Some strains were found to produce large quantities of oxalic acid. The oxalic acid-producing strains could be separated into two groups. Strains of one group (mostly brown-rot fungi) were able to produce oxalic acid, regardless of whether CaCO(3) was present in the medium. Strains of the other group (mostly white-rot fungi) were characterized by their ability to produce oxalic acid only when CaCO(3) was added to the medium. With the latter group, shake-culturing was generally more effective than stationary culturing in respect to acid production. In the CaCO(3)-containing media, Schizophyllum commune, Merulius tremellosus, and Porodisculus pendulus were found to produce substantial amounts of L-malic acid as a main metabolic product, along with small quantities of oxalic and other acids in shake cultures. Especially, S. commune and M. tremellosus may be employed as malic acid-producing species.
137 citations