University of Kuopio, Laboratory of Applied Environmental Chemistry, Department of Environmental Sciences, Patteristonkatu 1, FIN-50100 Mikkeli, Finland.
Environ Technol. 2009 Dec 14;30(14):1593-600. doi: 10.1080/09593330903358286.
The oxidation of ethylenediaminetetraacetic acid (EDTA) and Na, Ca, Zn, Fe, and Mn EDTA complexes with hydrogen peroxide was studied in aqueous solution with the use of several metallophthalocyanines (MePcS) as catalysts. The impact of pH, temperature, and catalyst/substrate ratio were investigated. The most effective catalytic system under neutral conditions was FePcS- H2O2. In these laboratory-scale experiments, a catalyst/substrate/H2O2 molar ratio of 4:100:2000 was found to be optimal, while the effective reaction temperature was 40-60 degrees C. When the impact of metal speciation was studied, metal-specific degradation rates in the removal of these compounds were observed: all EDTA-metal complexes except Zn-EDTA were efficiently oxidized within three hours. The most degradable species was Fe(III)-EDTA. Among the catalysts, FePcS was found to be the most active in EDTA degradation. Over 90% of EDTA was removed in the presence of FePcS as catalyst within three hours of reaction time.
研究了乙二胺四乙酸（EDTA）和 Na、Ca、Zn、Fe 和 Mn EDTA 配合物与过氧化氢在水溶液中的氧化作用，使用了几种金属酞菁（MePcS）作为催化剂。考察了 pH 值、温度和催化剂/底物比的影响。在中性条件下，最有效的催化体系是 FePcS-H2O2。在这些实验室规模的实验中，发现催化剂/底物/H2O2 的摩尔比为 4:100:2000 是最佳的，而有效反应温度为 40-60°C。当研究金属形态的影响时，观察到这些化合物去除过程中金属特异性降解速率：除 Zn-EDTA 外，所有 EDTA-金属配合物都在三小时内被有效氧化。最易降解的物质是 Fe（III）-EDTA。在催化剂存在下，FePcS 是 EDTA 降解最活跃的催化剂。在 3 小时的反应时间内，FePcS 作为催化剂可去除超过 90%的 EDTA。
