Bipyridine Enhanced the Degradation of Organic Contaminants in the Fe(Ⅱ)/Peroxymonosulfate Process
The narrow working pH range is one of the key factors limiting the widespread application of the ferrous iron/per-oxymonosulfate(Fe(Ⅱ)/PMS)system,and there is an urgent need to develop strategies to broaden the working pH range of the Fe(Ⅱ)/PMS system.This study aims to investigate the impact of nitrogen-containing complexing agents,1,10-phenanth-roline(phen)and 2,2'-bipyridine(bipy),on the efficiency and mechanism of organic pollutant degradation in the Fe(Ⅱ)/PMS process.The results indicate that the introduction of phen and bipy significantly enhances the degradation of organic pollutants containing electron-donating groups,such as phenol and diclofenac in the Fe(Ⅱ)/PMS system.When the molar ratios of phen/Fe(Ⅱ)and bipy/Fe(Ⅱ)are 3.0 and 4.5,respectively,the phen/Fe(Ⅱ)/PMS and bipy/Fe(Ⅱ)/PMS systems achieve the best removal for phenol.Both phen/Fe(Ⅱ)/PMS and bipy/Fe(Ⅱ)/PMS systems could efficiently degrade phenol within the pH range of 3.0～9.0.The results obtained from chemical probe,electron paramagnetic resonance,and quenching experiments reveal that 1O2 and Fe(Ⅳ)are the primary active oxidants in the phen/Fe(Ⅱ)/PMS and bipy/Fe(Ⅱ)/PMS systems and that 1O2 plays a major role in the degradation of phenol in both systems.
nitrogen-containing complexing agentsFe(Ⅱ)peroxymonosulfateorganic contaminantsactive species
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