Study On Degradation Of Organic Pollutants By Rosmarinic Acid Enhanced Fe³⁺-Fenton System Near Neutral PH

With the development of social industrialization,the problem of organic wastewater has caused widespread concerns.Physical and biological methods have certain limitations in the treatment of organic wastewater.Advanced oxidation technologies are commonly used to treat organic wastewater.Hydroxyl radical has strong oxidation ability and no selectivity.Fenton technology based on hydroxyl radical is widely used due to its high efficiency and low cost.At the same time,in order to overcome the shortcomings of Fenton technology such as easy precipitation and narrow pH range,some additives are used to enhance the Fenton oxidation system mediated by Fe³⁺.In this study,Fe³⁺/RA/H₂O₂ system was constructed by adding Rosmarinic acid to Fe³⁺/H₂O₂ system,we investigated as following and draw relevant conclusions:?1?In the paper,we reported that the presence of Rosemary acid?RA?could strongly enhance the Fe?III?-mediated Fenton oxidation of 2,4-DCP as the model contaminant at near neutral pH,and degraded organic pollutants universally.?2?Lot size optimized experiments were executed to achieve efficient2,4-DCP degradation?99.93%?under the optimum conditions of 100?mol/L Fe³⁺,100?mol l/L RA and 8 mmol/L H₂O₂ within 60 min.In addition,we explored the influence of co-existing metal ions,inorganic anions and natural organic matters,which inhibited the degradation of 2,4-DCP to a certain extent?3?This paper explored the role of RA,which could prevent ion precipitation and accelerate the Fe³⁺/Fe²⁺cycle due to chelating and reducing ability.Radical quenching experiments and electron paramagnetic resonance confirmed the existence and roles of hydroxyl radicals in the Fe³⁺/RA/H₂O₂ system.?4?Total organic carbon and chloride ion measurements were employed to probe the mineralization of organic matters?including RA and2,4-DCP?,and a possible mechanism for the degradation of 2,4-DCP by Fe³⁺/RA/H₂O₂ system was given.