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Homogeneous Catalytic Ozonation of Lipids Involving Fe 2+ and Mn 2+ : An Experimental and Modeling Study
Author(s) -
Ramos Rúbia Martins Bernardes,
Biz Ana Paula,
Tavares Deolinda Alvarez,
Kolicheski Mônica Beatriz,
Dantas Tirzhá Lins Porto
Publication year - 2020
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201900430
Subject(s) - catalysis , chemistry , manganese , effluent , degradation (telecommunications) , radical , ozone , homogeneous , inorganic ions , ion , inorganic chemistry , lipid oxidation , nuclear chemistry , organic chemistry , waste management , antioxidant , physics , engineering , thermodynamics , telecommunications , computer science
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 Fe 2+ > Mn 2+ , with Mn 2+ > Fe 2+ 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.