Efficient and selective photocatalytic nitrite reduction to N_(2)through CO_(2)anion radical by eco-friendly tartaric acid activation  

作　　者：Jingtai Bi Yupeng Cheng Mengmeng Sun Xiaofu Guo Shizhao Wang Yingying Zhao 

机构地区：[1]Engineering Research Center of Seawater Utilization of Ministry of Education,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300401,China [2]Hebei Collaborative Innovation Center of Modern Marine Chemical Technology,Tianjin 300401,China [3]Tianjin Key Laboratory of Chemical Process Safety,Tianjin 300130,China

出　　处：《Chinese Chemical Letters》2024年第11期249-253,共5页中国化学快报（英文版）

基　　金：financially supported by National Natural Science Foundation of China(No.22208081);Central Guidance on Local Science and Technology Development Fund of Hebei Province(No.226Z3102G);Fundamental Research Funds of Hebei University of Technology(No.JBKYTD2001)。

摘　　要：In this study,the environmentally friendly precursor,tartaric acid(TA),was employed for the generation of CO_(2)anion radical(CO_(2)^(·-))in an advanced UV/TA/Fe^(3+)system to reduce the hazardous NO_(2)^(-)-N in wastewater.To optimize this process,various factors,including the dosage of Fe^(3+),TA,and p H,were systematically investigated for their impact on the reduction process.Under the conditions of 3 mmol/L Fe^(3+)dosage,10 mmol/L TA dosage,and a pH of 2.5,NO_(2)^(-)-N was effectively removed from the water within 60 min,selectively transformed into N_(2),with a remarkable N_(2)selectivity of 91.2%.In the optimal conditions,the NO_(2)^(-)-N reduction mechanism in the UV/TA/Fe^(3+)system and the critical role of CO_(2)^(·-)were illustrated.Finally,this study explored the reduction of real nitrified seawater using the UV/TA/Fe^(3+)system.The results demonstrated that the UV/TA/Fe^(3+)system could completely eliminate NO_(2)^(-)-N and achieve a N_(2)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.

关 键 词：NITRITE Advanced reduction processes PHOTOCATALYSIS CO_(2)anion radicals Tartaric acid 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X701[环境科学与工程—环境工程]