大连理工大学学报2025，Vol.65Issue(2)：118-124,7.DOI:10.7511/dllgxb202502002
Fe(Ⅱ)介导的亚硝酸盐还原耦合砷氧化研究
Research on Fe(Ⅱ)-mediated nitrite reduction coupled with arsenic oxidation
摘要
Abstract
Biogeochemical cycling of nitrite(NO2-)and iron in reducing environments,such as groundwater,has an important influence on the transport and transformation behavior of arsenic.To understand the reaction processes and mechanisms,at different pH,NO2-and Fe(Ⅱ)concentrations using divalent iron(Fe(Ⅱ))as the reducing agent,the effect of the redox reaction between Fe(Ⅱ)and NO2-on the oxidation and solid-liquid partitioning of As(Ⅲ)is investigated.The results show that As(Ⅲ)oxidation rate is accelerated with the increase of pH in the range of 6.0-7.5,and the reaction rate is accelerated with the increase of Fe(Ⅱ)concentration in the range of 2-8 mmol/L and NO2-concentration in the range of 0.6-2.0 mmol/L.Within 66 h of reaction period,the decrease rate of As(Ⅲ)concentration reaches 91.96％,and the removal rate of total arsenic achieves 99.39％at pH 7.5.At the same time,the removal rate of nitrite also reaches more than 70％.The research results have important reference significance for the synchronous removal of arsenic and nitrite in groundwater.关键词
铁/砷/亚硝酸盐/氧化还原Key words
iron/arsenic/nitrite/redox分类
环境科学引用本文复制引用
薛杨峰,王少锋..Fe(Ⅱ)介导的亚硝酸盐还原耦合砷氧化研究[J].大连理工大学学报,2025,65(2):118-124,7.基金项目
国家自然科学基金资助项目(42173063) （42173063）
国家重点研发计划资助项目(2020YFC1807800). （2020YFC1807800）
