Abstract
In this study,the environmentally friendly precursor,tartaric acid(TA),was employed for the genera-tion of CO2 anion radical(CO2·-)in an advanced UV/TA/Fe3+system to reduce the hazardous NO2--N in wastewater.To optimize this process,various factors,including the dosage of Fe3+,TA,and pH,were sys-tematically investigated for their impact on the reduction process.Under the conditions of 3 mmol/L Fe3+dosage,10 mmol/L TA dosage,and a pH of 2.5,NO2--N was effectively removed from the water within 60 min,selectively transformed into N2,with a remarkable N2 selectivity of 91.2％.In the optimal condi-tions,the NO2-N reduction mechanism in the UV/TA/Fe3+system and the critical role of CO2·-were illus-trated.Finally,this study explored the reduction of real nitrified seawater using the UV/TA/Fe3+system.The results demonstrated that the UV/TA/Fe3+system could completely eliminate NO2--N and achieve a N2 selectivity of up to 90％,with minimal interference from coexisting ions.This work holds promising implications for the environmentally benign treatment of nitrite-polluted wastewater.
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