Photocatalytic Oxidation of Oxalic Acid with Oxygen and Ozone in an Aqueous Solution

IF 0.8 4区化学 Q4 CHEMISTRY, PHYSICAL Russian Journal of Physical Chemistry A Pub Date : 2025-03-17 DOI:10.1134/S0036024424702716

A. V. Levanov, A. V. Lapina, O. Ya. Isaikina

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Abstract—An experimental study has been carried out on the mineralization of oxalic acid H₂C₂O₄ and other oxidation-resistant organic compounds in aqueous solutions under the influence of oxygen, ozone, and ultraviolet radiation. It was found that in acidic solutions H₂C₂O₄ does not oxidize under the influence of ozone or UV irradiation in the presence of oxygen; when exposed simultaneously to O₃ + UV it has a low rate of oxidation. The possibility of photocatalysis of the mineralization process by Mn²⁺, MnO\(_{4}^{ - }\), Fe³⁺, Co²⁺, BrO\(_{3}^{ - }\), or IO\(_{3}^{ - }\) ions was studied The most effective photocatalysts are Fe³⁺ ions: in their presence and under UV irradiation, a fairly rapid oxidation of oxalic acid to CO₂ occurs, as under the influence of O₃ and O₂. The conditions for maximum ozone conversion during photomineralization of oxalic acid have been found. The possibility of oxidative destruction of a more oxidation-resistant substrate, acetic acid, is shown during ozonation and UV irradiation of solutions with Fe(III) and H₂C₂O₄ additives.

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水溶液中氧和臭氧光催化氧化草酸的研究

摘要/ abstract摘要：对草酸H2C2O4等抗氧化有机化合物在氧、臭氧和紫外线作用下的矿化进行了实验研究。研究发现，在有氧存在的酸性溶液中，H2C2O4在臭氧或紫外线照射的影响下不氧化；当同时暴露在O3 +紫外线下时，它的氧化率很低。研究了Mn2+、MnO \(_{4}^{ - }\)、Fe3+、Co2+、BrO \(_{3}^{ - }\)或IO \(_{3}^{ - }\)离子光催化矿化过程的可能性。最有效的光催化剂是Fe3+离子：在它们存在的情况下，在紫外线照射下，草酸在O3和O2的影响下，可以相当快地氧化成Co2。找到了草酸光电矿化过程中臭氧转化率最高的条件。在含Fe（III）和H2C2O4添加剂的溶液的臭氧化和紫外线照射过程中，表明了一种更抗氧化的底物乙酸被氧化破坏的可能性。

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来源期刊

Russian Journal of Physical Chemistry A 化学-物理化学

CiteScore

1.20

自引率

14.30%

发文量

376

审稿时长

5.1 months

期刊介绍： Russian Journal of Physical Chemistry A. Focus on Chemistry (Zhurnal Fizicheskoi Khimii), founded in 1930, offers a comprehensive review of theoretical and experimental research from the Russian Academy of Sciences, leading research and academic centers from Russia and from all over the world. Articles are devoted to chemical thermodynamics and thermochemistry, biophysical chemistry, photochemistry and magnetochemistry, materials structure, quantum chemistry, physical chemistry of nanomaterials and solutions, surface phenomena and adsorption, and methods and techniques of physicochemical studies.