Nitrate reduction by·CO_(2)^(-) from UV-activated HCOOH

作     者：Xu Yiqiao Wu Lei Zheng Tianyi 许贻乔;吴磊;郑天怡

作者机构：School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Jiangsu Branch of China Municipal Engineering Northwest Design and Research Institute Co.Ltd.Nanjing 210017China 

基　　金：The National Major Science and Technology Project(No.2017ZX07202-004-005) 

出 版 物：《Journal of Southeast University(English Edition)》 (东南大学学报（英文版）)

年 卷 期：2022年第38卷第1期

页      码：77-84页

摘      要：To address the environmental and health hazards of nitrate(NO_(3)^(-))in water,a denitrification advanced reduction process(ARP)using only formic acid(HCOOH)activated by ultraviolet(UV)light was *** efficiency,influencing factors,mechanism,and kinetics of the reduction were investigated through component analysis and radical *** show that,after 90 min of UV illumination,the reduction and gas conversion ratios of 50 mg/L NO_(3)^(-)-N reach 99.9%and 99.8%,respectively,under 9 mM of C_(0)(HCOOH),pH=3.0,and N_(2) ***,96.7%of HCOOH is consumed and converted into *** NO_(3)^(-)-N conversion process includes the transformation to NO_(2)^(-)-N,followed by a further reduction to gas and a direct conversion into gas,introducing small amounts of nitrite and *** carbon dioxide anion radical(·CO_(2)^(-))from HCOOH/HCOO^(-)is the principal cause of NO_(3)^(-)-N reduction by UV/HCOOH/N 2 *** contrast,·CO_(2)^(-)production is caused by the hydroxyl radical(·OH).The NO_(3)^(-)-N reduction efficiency is enhanced by the increase in the light intensity,considerably affected by the initial pH,and less affected by inorganic anions,including Cl^(-),H_(2)PO_(4)^(-),and HCO_(3)^(-)/CO_(3)^(2-).The initial HCOOH concentration and light intensity are the main factors that influence the NO_(3)^(-)-N reduction rate.

主 题 词：nitrate reduction advanced reduction process ultraviolet HCOOH ·CO-2 

学科分类：1002[医学-临床医学类] 1001[医学-基础医学] 08[工学] 0815[工学-矿业类] 

核心收录：

D　O　I：10.3969/j.issn.1003-7985.2022.01.012

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