首页|Efficient and selective photocatalytic nitrite reduction to N2 through CO2 anion radical by eco-friendly tartaric acid activation
Efficient and selective photocatalytic nitrite reduction to N2 through CO2 anion radical by eco-friendly tartaric acid activation
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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.
Engineering Research Center of Seawater Utilization of Ministry of Education,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300401,China
Hebei Collaborative Innovation Center of Modern Marine Chemical Technology,Tianjin 300401,China
Tianjin Key Laboratory of Chemical Process Safety,Tianjin 300130,China
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