Homogeneous Catalytic Ozonation of Lipids Involving Fe2+ and Mn2+: An Experimental and Modeling Study,Clean - Soil Air Water

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Homogeneous Catalytic Ozonation of Lipids Involving Fe2+ and Mn2+: An Experimental and Modeling Study
Clean - Soil Air Water ( IF 1.5 ) Pub Date : 2020-06-21 , DOI: 10.1002/clen.201900430
Rúbia Martins Bernardes Ramos ₁ , Ana Paula Biz ₁ , Deolinda Alvarez Tavares ₁ , Mônica Beatriz Kolicheski ₁ , Tirzhá Lins Porto Dantas ₁

Affiliation

Given the issue of lipids in effluent treatment systems and their negative impact on the environment, this study aimed to examine lipid degradation by homogenous catalytic ozonation with the aid of iron and manganese ions. This technology presents the possibility of completely mineralizing pollutants using hydroxyl radicals. Milk is chosen as the lipid source because of the high concentration of triglycerides in its matrix, this kind of lipid being the one found most frequently in food and, consequently, in effluent treatment systems. The milk pH value is controlled, and acidic, neutral, and basic conditions are evaluated. The rates of pseudo‐first‐order reactions and the effective value are estimated. It is shown that under acidic conditions low catalyst dosages are enough to cause the complete degradation of lipids. Under neutral conditions, a similar behavior is observed. Under basic conditions, higher catalyst dosages give higher reaction rates. The order of effectiveness of the catalysts under acidic and basic conditions is Fe²⁺ > Mn²⁺, with Mn²⁺ > Fe²⁺ under neutral conditions. Homogeneous catalytic ozonation is therefore efficient at lipid degradation. This technique is viable economically, since the lipid removal occurred at low ozone levels. In addition, the ions used as catalysts are naturally abundant.

中文翻译：

涉及Fe2 +和Mn2 +的脂质的均相催化臭氧化：实验与模型研究

考虑到污水处理系统中脂质的问题及其对环境的负面影响，本研究旨在研究借助铁和锰离子进行均相催化臭氧化处理脂质的降解。该技术提供了利用羟基自由基完全矿化污染物的可能性。之所以选择牛奶作为脂质源，是因为其基质中甘油三酸酯的浓度很高，这种脂质是食品中最常见的脂质，因此在污水处理系统中也是如此。控制牛奶的pH值，并评估其酸性，中性和碱性条件。估计伪一阶反应的速率和有效值。结果表明，在酸性条件下，低催化剂用量足以使脂质完全降解。在中立条件下观察到类似的行为。在碱性条件下，催化剂用量越高，反应速率越高。催化剂在酸性和碱性条件下的有效性顺序为铁²⁺ > Mn ²⁺，在中性条件下Mn ²⁺ > Fe ²⁺。因此，均相催化臭氧化在脂质降解方面是有效的。该技术在经济上是可行的，因为脂质的去除发生在低臭氧水平下。另外，用作催化剂的离子自然丰富。

更新日期：2020-06-21

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